DZL horizontal automatic chain quick loading steam boiler

1、 Structure Introduction:
DZL horizontal automatic chain quick loading steam boiler is a horizontal three return water fire tube hybrid boiler, with a bundle of threaded smoke tubes arranged inside the drum. Light tube water is installed on both sides of the furnaceCold wall. A lightweight chain grate is used for mechanical coal addition, equipped with a blower and induced draft fan for mechanical ventilation, and a scraper type slag removal machine for automatic slag removal. The front and rear arches of the furnace are made ofNew energy-saving technology furnace arch.
The fuel falls from the coal hopper onto the grate and enters the furnace for combustion. The flame refracts upwards through the rear arch, passes through the combustion chambers on both sides of the main body, and then turns back into the front smoke box, which then turns back into the potBundle, enter the economizer through the rear smoke box, and then be drawn by the induced draft fan through the flue to the chimney and discharged into the atmosphere.
2、 Performance characteristics:
1. The thermal efficiency of the boiler is above 77%, which is higher than the standard of "General Technical Conditions for Industrial Boilers".
2. The operation has been mechanized, reducing the labor intensity of the stoker.
3. Install the valve instruments, drum, induced draft fan, smoke and air duct, economizer, dust collector, and slag extractor on the factory site. The coal feeder and water circuit can be operated, andIt has the characteristics of fast start-up and ignition.
4. Easy installation and mobility can save a significant amount of infrastructure investment.
5. Class II bituminous coal with a low calorific value ≥ 17750J/Kg, volatile matter>38.5%, and ash content ≤ 32.4%.
3、 Factory Overview:
When the DZL type chain grate horizontal quick loading boiler leaves the factory, it is packaged in pieces as follows:
1. Boiler components include the boiler body, chain grate coal hopper, sight hole, ignition door, front and rear smoke boxes, furnace wall, and insulation layer.
2. Speed control box transmission device, including electric motor, etc.
3. Blower: including electric motor, blower base, and inlet pipe, etc.
4. Induced draft fan: including electric motor, bearing seat, and flue connecting pipe, etc.
5. Scraper slag removal machine: including an electric motor.
6. Platform escalators and railings.
7. Dust collector: including dust collector bracket, ash hopper, foundation bolts, etc.
8. Chimney.
9. Water supply equipment, valves, instruments, and pipeline components.
10. Electric control cabinet.
11. Coal feeder: (user selected).
12. When installing two or more boilers at the same time, attention should be paid to the markings of the blower (including blower base and interface), induced draft fan (including inlet pipe), economizer and other components (boiler factory)The number is the same as the mark on the boiler.
13. Accompanying documents: including general drawing, main body, main body, cylinder, furnace wall, pipeline and instrument valves, insulation layer, foundation drawing, chain grate, platform escalator, chimney, drawings of vulnerable parts andTwo copies of strength calculation for pressure components, installation and use instructions, boiler master list, and one copy of product inspection quality certificate.
Installation instructions:
4 Preparation before installation:
After the boiler is transported to the site of use, in order to ensure rapid operation, the following preparations must be made before installation:
1. Determine the installation company and verify the qualification certificate. Organization and staffing:
The boiler installation unit must have a boiler installation qualification certificate issued by the superior competent department that meets the installation scope, and be responsible for contacting the local boiler supervision agency and filling out the installation noticeAnd accept installation supervision and inspection by local boiler inspection and testing units. After installation is completed, the installation unit and the local boiler supervision agency jointly conduct installation quality acceptance. And in accordance with relevant regulations andComplete the registration and household registration procedures for boiler usage at the time. The unit using the boiler should have a dedicated person responsible for the boiler installation work. During the boiler installation, the boiler operator should participate and be equipped with plumbers, fitters, and lifting workersCold workers, welders, and auxiliary workers.
2. Installation quality requirements:
①. Boiler installation should comply with design requirements and meet the requirements of GB50273-1998 "Code for Construction and Acceptance of Industrial Boiler Installation Engineering".
②. The insulation of boilers, their ancillary equipment, and thermal pipelines shall comply with the requirements of GB4272.
3. Determine the installation location:
⑴. It is best to have the installation location close to the steam usage area to reduce heat loss in the pipeline.
⑵. Convenient water supply and drainage.
⑶. The storage and transportation of fuel and ash are convenient.
⑷. The boiler is unobstructed during installation and transportation.
⑸. The layout of the boiler room should comply with the provisions of Chapter 8 of the Safety Technical Supervision Regulations for Steam Boilers, with sufficient lighting, good ventilation, and no water accumulation on the ground to ensure the operation of the boiler

Easy operation and maintenance, with a gap of 4-5 meters in front of the furnace (starting from the edge of the coal hopper), 2.5-3 meters behind the furnace, a gap of no less than 1-2 meters on the left side (including the blower), and a gap of no less than on the right side3 meters.
4. Foundation preparation:
Construct according to the foundation drawing, use ordinary bricks to build two wall feet, create a slag pit foundation, and reserve anchor bolt holes for the dust collector and induced draft fan in advance.
5. Equipment acceptance:
⑴. After the boiler is transported, check the components according to the factory packing list, verify the integrity of the equipment based on the boiler installation diagram, and inspect whether the large parts of the boiler are damaged during transportationAbnormal deformation and other situations.
⑵. When unloading the large components of DZL boiler, 8-10 pipes can be placed under the iron plates on both sides of the base, and pulled by steel wire rope to slowly move the boiler components on the rolling pipesIt should be hooked onto the base pull ring and not damage any part of the boiler's large components.
⑶. If large boiler components need to be lifted, their lifting equipment capacity should not be less than 20 tons. They can be lifted from the four support ears on the top of the furnace, or slowly lifted with a jack under the iron plates on both sides of the base. Do notLift at any other location.
Five Installation of large boiler components:
After the large boiler components are placed on the two wall feet, use a level to check whether the left and right sides of the grate are level, allowing for a tilt of no more than 5 millimeters. Raise the lower side with an iron pad and then use cementSmooth the gap between the base and the foundation.
VI Installation of induced draft fan:
After the boiler components are in place, assemble the induced draft fan, flue pipe, and chimney in the corresponding positions according to the drawing requirements. After the induced draft fan is installed, check for defects such as jamming and air leakage, and then connect the power supplyRun the source test to check whether the motor direction is correct, whether there is friction or vibration, and whether the motor temperature is normal. The specified lubricating oil should be added to the bearing seat, and then refilled once a month in the futureSecondly, during the cold operation of the induced draft fan and the start-up of the cold furnace, the maximum operating time should not exceed 5 minutes, and the flue gas regulating valve should be closed to prevent motor load during cold operationIt will increase exponentially, and there is a possibility of the electric motor burning out.
7 Installation of chimney and flue connecting pipes:
When installing the chimney, asbestos ropes should be embedded between the flanges, and the verticality of the chimney should be checked using a plumb line. If there is any deviation, it can be leveled and corrected at the flange connection.
2. The steel wire rope should be tightened with bolts, and the tension of the three lead wire ropes should be roughly equal.
3. If there is an environmental hygiene permit or special needs, the chimney height can be appropriately reduced, but consideration should be given to the flying of smoke and dust.
8、 Installation of blower:
First, install the blower base on the back of the boiler body, then install the blower and inlet duct. The connection part should be firm and tight, the air damper should be flexible to open and close, and the positioning should be reliable. Then, connect the power supplyTrial operation, the blower can also be installed outdoors, but rain proof facilities should be provided.
9、 Installation of speed control box:
Adjust the position of the front speed control box according to the grate chain wheel shaft, tighten the coupling bolts and put the anchor bolts into the embedded holes, and then pour the anchor bolts firmly after leveling.
After the assembly and trial operation of the speed control box, it is shipped out. Before installation, the user needs to check whether there is any collision during transportation and whether the rotating drive shaft is stuck.
Install according to the diagram, connect to the front sprocket on the foundation, adjust the height position, connect the power supply, add lubricating oil for trial operation, no abnormal noise, and the temperature rise of the motor is within the allowable rangeOnly internally.
10、 Installation of slag extractor:
First, install the ash leakage interface to the lower part of the grate bottom plate, then install the slag machine and position it accordingly. Connect the rectangular flange, and the interface must be lined with rubber asbestos board. Finally, install the bracket and bearingsBase.
After installation, carefully check whether the motor direction, bearings, temperature, etc. meet the requirements, and inspect the equipment for any abnormal conditions such as friction and vibration to ensure normal use. butAfter connecting the power, check if the rotation direction is correct. After a cold test run for 2 hours, there should be no abnormal sound, and water should be drained to check if the flange interface is leaking.
11、 Installation of electrical control cabinet:
The electrical control cabinet is the switch button for the boiler speed control box, blower, induced draft fan, spiral slag extractor, water pump, water level alarm, etc. After all are powered on, the box shell should be protectively grounded.The electrical control cabinet should be installed in front of the boiler, close to the wall, to facilitate monitoring of various instruments on the boiler and facilitate operation.
12、 Installation of pipelines, instrument valves, and accessories:
Install according to the pipeline instrument valve drawings, fix the feedwater pump in the appropriate position, pour the foundation, and test run after connecting the power supply.
1. Safety valve:
The safety valve should be installed after the boiler water pressure test is completed, and the working pressure of the safety valve should be adjusted during the initial ignition.
Adjust the pressure according to Table 7-2 of Article 143 of the "Steam Boiler Safety Technical Supervision Regulations" of the State Administration of Labor.
① Adjustment method for safety valve:
Remove the opening pin, remove the top cover, loosen the hexagonal lock nut, and then turn the adjusting screw to loosen or tighten the spring to achieve the required exhaust pressure of the safety valve. Tighten after adjustmentTighten the nut and then assemble the remaining parts.
② The boiler is equipped with two safety valves, and the set pressures of the safety valves for this model of boiler are 1.3MPa and 1.325MPa, respectively.
After the safety valve reaches the specified set pressure, it should be sealed with lead. Unless the safety valve is calibrated, it is not allowed to dismantle the lead seal without authorization at any time.
③ When adjusting the safety valve, the water level in the drum should be slightly lower than the normal water level, and be prepared to allow water to enter at any time after the safety valve is opened.
④ Do not tap any part of the safety valve. Only the control rod on the valve can be used to open the safety valve.
⑤ The boiler must not be used before the safety valve is adjusted.
Regular attention should be paid to whether the safety valve is functioning properly. Due to the effect of water vapor, in order to prevent the valve disc and seat of the safety valve from sticking, regular exhaust tests should be conducted every 2-4 weeksOnce, to verify the opening and closing function of the safety valve. The safety valve should be installed after the hydrostatic test. The safety valve should be connected to the exhaust pipe to direct the steam to a safe location in the boiler room. The safety valve should be installed verticallyValves are not allowed to be installed on guide pipes.
2. Pressure gauge:
When installing a pressure gauge, the dial should face the front of the boiler. After the pressure gauge is installed, a red line should be drawn on the dial to indicate the maximum allowable working pressure of the boiler. The pressure gauge cock should be flexibleLive, no leakage, water supply should be smooth, and pressure gauge pipes should not be insulated.
It is strictly prohibited to use a pressure gauge in any of the following situations:
（1）. The pressure gauge with a limited stop pin cannot return to the limit pin after the pointer rotates when there is no pressure; A pressure gauge without a limiting pin, when there is no pressure, the value of the pointer above zero exceeds the pressureThe force gauge specifies the allowable error.
（2）. The glass surface is broken or the dial scale is unclear.
（3）. Seal damage or exceeding inspection period.
（4）. Surface leakage or pointer jumping.
3. Water level gauge:
⑴. The deviation between the water level gauge and the normal water level line of the drum is ± 2mm. The marks of the highest safe water level, lowest safe water level, and normal water level should be accurately marked. The water level gauge should have a drain valve(or drain plug) and a drain pipe connected to a safe location. The lower drainage pipe of the water level gauge must be connected to a safe location. The water level gauge cock should rotate flexibly and not leak waterLighting equipment must be installed for easy observation.
⑵. The water level alarm and water level controller of the water supply system are electrode type automatic control devices that should be docked according to the diagram:
① Water level controller SZB-IV (water level alarm)
a. When the normal water level is above 40mm, the contact of the water pump control switch opens and the water pump stops working.
b. When the normal water level is below 40mm, the contact of the water pump control switch contacts and the water pump starts working.
c. When the normal water level is+50mm, the first set of electrode high water level contacts will combine to output a high water level alarm signal.
d. At a normal water level of -50mm, the second set of electrode low water level contacts combine to output a low water level alarm signal.
4. When the sewage pipe is connected to the sewage tank or other safe place, the pipeline should be fixed to prevent displacement or accidents such as counterattack burns during sewage discharge.
5. There should be at least one elbow on the main steam valve pipeline, otherwise an expansion joint should be installed, and the wall of the pipeline should be insulated.
6. The platform escalator support base has been welded onto the boiler body. On site installation only requires connecting the long and short supports to the support base with M16 bolts, and finally fixing the platform escalator, etc.
Thirteen Boiler installation inspection and acceptance:
After the installation of all boilers is completed, the boiler and its ancillary equipment should be carefully inspected and accepted item by item to meet the requirements for ignition operation. A comprehensive inspection should include at least the following items:
1. Boiler inspection: Check if the internal components of the drum are installed correctly and if there are any tools or debris left in the furnace. After inspection and confirmation, the manhole and handhole can be closed.
2. Inspection outside the pot: The main inspection is to check whether there is any accumulation or blockage inside the furnace and flue, whether the furnace walls are intact, and whether there are cracks, protruding bricks, or peeling phenomena. Is the insulation layer intact,Whether all flue doors, inspection doors, etc. are intact, whether the operation is flexible, and whether the sealing is tight.
3. Stove inspection: Mainly inspect the necessary gap between the movable and fixed parts of the grate, check whether the handle of the movable grate can be pushed and pulled freely, and whether it can reach the specified position.
4. Fan inspection:
For fan inspection, first manually rotate the coupling or transmission V-belt to check for any abnormal conditions such as friction, collision, or jamming in the dynamic and static parts. The switch of the fan inlet regulating plate shouldFlexible and rigorous. Check the direction of the fan and ensure that the impeller rotates evenly without friction or collision.
5. Other inspections:
Check all pipelines and valves of the water supply system (including water treatment and boiler feed pumps).
Check all pipelines and valves of the sewage system.
Check all pipelines, valves, and insulation layers of the steam supply system.
Check the sealing condition of the dust outlet of the dust collector.
Check the electrical control instruments and protective devices in the operating room.
Fourteen Hydrostatic test:
After the installation inspection of boiler pipeline instruments and valves and the internal inspection of the boiler are completed, close the manhole and hand hole, and then conduct a water pressure test according to Article 207 of the "Steam Boiler Safety Technical Supervision Regulations"Test.
The rated steam pressure of this model of boiler is 1.25MPa, and the hydrostatic test pressure is 1.65MPa.
When conducting a water pressure test, the water pressure should slowly rise. When the water pressure reaches the rated steam pressure of 1.25 MPa, the pressure rise should be paused to check for water leakage or abnormal phenomena. Then boost the voltage toThe test pressure is 1.65MPa. If the pressure does not decrease after 20 minutes, check when it drops to the rated steam pressure of 1.25MPa.
The specific operation and qualification standards of the hydrostatic test are described in Section 22 of this manual Inspection and hydrostatic testing of pressure components:
Fifteen Cold state debugging:
After the boiler installation inspection is completed, cold commissioning of each part must be carried out, which must be operated by the boiler operator.
1. Air leakage test:
⑴. Air side test: During the test, close the last air door, start the blower, open the inlet control door to maximize the system air pressure, and check the flange interfaces, welds, and other vulnerable parts for leaksMark the location and handle it after stopping the machine.
⑵. Smoke side test: During the test, first close the baffles, doors, and holes of each part of the furnace flue. When conducting a positive pressure test, start the blower to pressurize the flue gas side and adjust the air damper to maintain the furnace inside200-400MPa positive pressure, all grate air doors are open, ash discharge doors are closed, all air doors along the flue gas flow are open, and all ash discharge doors, slag discharge doors, furnace doors, fire observation holes are closedSeal the dust collector with water. Mark the leaking area and handle it after stopping the machine.
The leakage areas are prone to occur at the expansion joints of the furnace wall, pipe penetrations, manholes, flue connection flanges, and welds.
Test method: Add white powder or ignite combustible materials that can produce smoke at the inlet of the blower, so that there are traces of white powder or smoke escaping from the air leakage.
Leakage elimination method: Asbestos rope can be used to fill the expansion joint of the furnace wall. For door and hole leakage, the contact surface should be scraped flat. Asbestos rope should be added to the flange of the flue connection and the bolts should be tightened. The weld seam should be repairedWelding.
instructions
Oven and boiling furnace:
16、 Inspection before baking and boiling:
Boiler operators should meet the requirements of the "Assessment and Management Regulations for Boiler Operators" issued by the General Administration of Quality Supervision, Inspection and Quarantine of China, and water quality analysts should also hold corresponding qualification certificates to workBefore baking and boiling, the stoker must carefully inspect all components of the boiler, with the following inspection items:
1. Chain grate cold test run for more than 8 hours, the cold test run should meet the following requirements:
⑴ The grate plate should turn smoothly at the sprocket shaft. If an arch is found, two tension bolts can be adjusted.
The minimum gap between the active grate plates on both sides and the side sealing block and side sealing angle steel shall not be less than 4 millimeters.
The active grate plate and sprocket are well connected.
The distance between the two ends of the grate long pin and the two side plates of the grate should be kept equal at the sprocket shaft. If friction is found between one end and the side plate, a hammer or lead clip can be used outside the long waist hole to adjust the distance between the two endsThe distance remains equal, and there is no severe unilateral tilt of the grate plate.
The rotation of the grate plate should not be stuck, and the safety clutch on the speed control box should not bounce.
2. Check if there are any broken grate pieces and if the grate long pins are severely bent. If so, they can be pulled out, straightened, and reinstalled outside the waist hole of the grate at any time.
3. It is not allowed for unrelated components (such as bolts, nuts, nails, etc.) to be lost on the chain grate.
4. The ignition door can be opened flexibly, the coal gate can be raised and lowered conveniently, and the distance between the left and right sides of the coal gate and the grate surface should be equal to ensure that the coal seam thickness on both sides of the furnace is the same. If the distance is not equal, it can be reducedThe method of making the chain links equal should be used, and the cover plate of the coal gate should be tightly covered to prevent coal blocks from leaking in and getting stuck in the up and down movement of the coal gate.
5. The adjustable air doors and flue gas control doors of each air window of the grate are flexible in opening and closing.
6. There is no jamming phenomenon at the contact between the eagle iron and the grate.
7. The trial operation of the blower, induced draft fan, spiral slag extractor, and water supply equipment should be normal.
8. Whether the manhole and handhole are tight, and whether the accessory parts and devices are complete.
9. Whether the furnace wall is normal and whether the front and rear smoke boxes are tight.
10. Whether the steam pipeline, water supply pipeline, and sewage pipeline are complete, correct, and unobstructed.
11. Whether the economizer is tight and whether the flue gas channel is unobstructed.
12. All bearing housings and oil cups are filled with lubricating oil.
Seventeen Oven and boiling furnace:
After the installation of all components of the boiler is completed, and after inspection and trial operation, it is confirmed that all components have the conditions for safe operation, the drying and boiling process can begin.
1. Oven drying:
The following conditions should be met before baking:
①. The boiler and its water treatment, steam and water, sewage, coal transportation, slag removal, air supply, dust removal, lighting and other systems have been installed and passed the water pressure test.
②. The anti-corrosion and insulation measures have been completed and passed the air leakage test.
③. The boiler's water level gauge, pressure gauge, temperature measuring instrument, and other thermal and electrical instruments used for baking should be installed and tested.
④. Boiler feedwater shall comply with the relevant provisions of GB1576-2001 "Industrial Boiler Water Quality".
⑤. Pipelines, flues, and valves should all indicate the flow direction, opening direction, and opening height of the medium.
2. Oven drying method and precautions:
1. Close the rear manhole, lower handhole, main steam valve, and water level gauge drain plug, and open a safety valve to allow the air and steam inside the boiler to be discharged outward.
2. Inject the treated water into the boiler, with the inlet water temperature generally not exceeding 40 ℃. Raise the boiler water level to 2/3 of the water level gauge, close the water supply valve, and wait for the water level in the boiler to stabilize before observingCheck if the water level has decreased, and inspect the hand hole cover, flange contact surface, and drain valve of the boiler header for any water leakage. If there is any water leakage, tighten the bolts.
3. Turn on the ignition door, lay a layer of 20-30 millimeters thick coal slag on the grate, and use firewood (strictly prohibited from using wooden boards with iron nails), cotton yarn or other ignition materials to ignite and burn the coal slag.
4. Place the firewood in the middle of the grate, occupying about 1/2 of the grate area. After igniting the ignition material and firewood, use low heat to bake. At the same time, open the air damper of the induced draft fan by 1/6 to 1/5

Make the flue gas flow slowly, maintain the furnace negative pressure between 10-20Pa, and keep the furnace water temperature between 70-80 ℃. After three days, a small amount of coal can be added to gradually replace firewood for baking,At this point, open the induced draft damper to 1/4 to 1/3 and increase the air flow appropriately. During the entire baking process, the flame should not be intermittent, and the temperature must slowly increase to minimize as much as possibleTemperature difference and uniform expansion of each part to prevent the furnace wall from losing its tightness after drying.
If the furnace wall is particularly damp, it is best to let it dry naturally for a period of time before baking.
6. The drying time is related to the structure of the furnace wall and the degree of dryness and wetness. If the furnace wall is damp, the climate is cold, especially during rainy seasons, and the air is humid, the drying time should be appropriately extended.
7. When drying the oven, attention should be paid to not heating up too quickly, and the heating should be as uniform as possible to prevent the furnace wall from cracking or deforming due to too fast a heating rate. Close attention should be paid to whether the furnace wall cracks or collapsesFalling phenomenon. Improper drying methods can cause cracking, deformation, and collapse of the furnace wall, affecting the safe operation of the boiler.
2. Boiling furnace
The purpose of boiling is to add NaOH and Na3Po4.12H2O to the boiler for chemical treatment. A sealed boiling method is used to remove oil and rust from the boiler, ensuring even heating of the boilerRunning normally.
⑵ The dosage of chemicals added during boiling should comply with the provisions in the following table:
Drug name
Dosage Kg/m3 water
Thin rust
Thick rust
Sodium hydroxide (NaOH)
2~3
3~4
Trisodium phosphate (Na3PO4)
2~3
2~3

The drug is calculated based on 100% purity. When there is no trisodium phosphate, sodium bicarbonate can be used as a substitute, with a quantity 1.5 times that of trisodium phosphate.
⑶ Sodium carbonate can be used separately for boiling, with a quantity of 6Kg/m3 water.
When adding chemicals, the boiler water should be at a low water level.
At the end of the boiling process, the boiler pressure should be maintained at around 75% of the working pressure, and the boiling time is generally 2-3 days.
During the boiling process, regularly collect and analyze the boiler water. The tightness of the boiler water should not be lower than 45mol/L, otherwise additional chemicals should be added.
After boiling, the sediment in the drum collection box should be cleaned, the inside of the boiler and the valves that have come into contact with the liquid medicine should be flushed, and the sewage should be checked for blockage.
After boiling, the following requirements should be met:
① The inner walls of the drum and header should be free of oil stains.
② After wiping off the attachments, the metal surface should be free of rust spots.
The boiling work should be able to be carried out simultaneously in the later stage of the drying process.
If the boiling furnace does not meet the requirements, it will deteriorate the steam quality, produce steam water co distillation, corrode pipe fittings, headers and other components, endanger the safe and economic operation of the boiler, and affect the service life of the boiler.
9. After the boiler cools down, open the manhole and handhole covers, clean the inside of the boiler with clean water, and inspect it. If oil stains are still found, follow the above method to boil the boiler again until the boiler is heatedUntil there is no oil pollution inside the furnace.
18 Raise the fire:
1. Before starting the boiler, a comprehensive inspection (including related accessory pipelines) should be conducted. Close the drain valve and open the pressure gauge plug to allow the air inside the boiler to be discharged.
2. Slowly inject the treated water into the boiler, with the inlet water temperature generally not exceeding 40 ℃. When the water level reaches the lowest position on the water level gauge, close the water supply valve. After the water level stabilizes, observe the water levelHas it decreased and then replenished to the normal water level.
3. When igniting, open the ignition door and place firewood or other ignition materials (iron nails are strictly prohibited) at the front end of the grate to ignite. Open the smoke control door to enhance natural ventilation. After the ignition materials are burned,Turn down the smoke control valve, intermittently turn on the induced draft fan, and start manually filling coal after the ignition material burns vigorously. Observe the ignition situation at the observation hole and adjust the ignition appropriately until the coal can be continuously ignitedAfter the fire, adjust the air volume of the drum and induced draft, maintain the furnace negative pressure at 0.1-0.2 MPa, and make the combustion gradually normal.
4. When starting the fire, the temperature should not increase too quickly to avoid excessive thermal stress caused by uneven heating of various parts, which may affect the service life of the boiler. The first time starting the fire, the steam pressure should rise from the cold furnace to the working pressureThe recommended time for heating is 3-4 hours. In the future, unless there are special circumstances that require urgent gas, the cold furnace should be heated for no less than 2 hours, and the hot furnace should be heated for no less than 1 hour.
5. After heating, pay attention to the water level in the pot at all times, as the water level rises after heating. If it exceeds the highest water level, discharge the water.
When steam emerges from the opened safety valve, the safety valve should be closed and the pressure gauge, bend pipe, and water level gauge should be flushed. When the steam pressure rises to 0.2-0.3 megapascals, check the manhole coverCheck if there is any leakage in the hand hole cover and drain valve, and tighten the bolts if there is any leakage.
7. When the pressure inside the boiler gradually increases, attention should be paid to whether there are any special noises from the various components of the boiler. If there are any, the boiler should be stopped immediately for inspection, and the fault should be resolved before continuing to operate.
Nineteen Supply of steam:
When the pressure inside the pot approaches the working pressure, prepare to supply steam to the outside. Before supplying steam, the water level inside the pot should not exceed the normal water level, and the combustion inside the furnace should be stable during steam supply.
When supplying steam, the main steam valve should be slowly opened to allow a small amount of steam to warm up the pipeline. At the same time, the drain valve on the pipeline should be opened to release condensed water. The heating time depends on the length, diameter, and steam of the pipelineThe steam temperature and other factors determine the heating time, which should generally not be less than 10 minutes. When warming up the pipe, attention should be paid to the expansion of the pipe and the condition of the pipe support. If any abnormal situation is found, the heating should be stopped immediatelyEliminate faults and defects, wait until the pipeline is hot and the condensed water on the pipeline gradually decreases before fully opening the main steam valve. When starting, it should be done slowly, while paying attention to whether there are any special noises from the various components of the boilerIf there is any noise, it should be checked immediately, and if necessary, the furnace should be shut down for inspection. After the main steam valve is safely opened, the handwheel of the main steam valve should be returned half a turn to prevent disadvantages such as inability to rotate after thermal expansionThe accessory parts, valves, and instruments should be inspected again for steam leakage and normal operation. In order to prevent water lifting (steam carrying water), the water level should not exceed the water level gauge under any circumstancesAfter the glass plate is fully opened and the main steam valve is fully opened, it should be closed one circle to prevent thermal contraction. The rated output can be achieved under stable combustion conditions.
Twenty Normal operation:
During normal operation of the boiler, it is required to ensure that the water level inside the boiler is normal, the steam pressure is stable, the cleanliness of the boiler room is maintained, the handover work is done well, and the maintenance of various mechanical equipment and instruments is strengthenedObserve, ensure safety and reliability, prevent accidents, pay attention to saving coal, and the stoker should regularly summarize work experience to continuously improve operational level.
1. Water supply requirements: Boiler feedwater needs to be treated with a total hardness of ≤ 0.03mmol/L.
2. Water level in the pot:
Regularly pay attention to changes in the water level inside the pot, keeping it within the normal range of water level, and not exceeding or falling below the highest or lowest water level. The water level in the water level gauge generally has a slight shaking phenomenonIf the water surface is still, there may be blockage in the water level gauge, and it should be flushed immediately.
3. Water level gauge:
The deviation between the water level gauge and the normal water level line of the drum is ± 2mm. The markings for the highest safe water level, lowest safe water level, and normal water level should be accurately marked.
Rinse the water level gauge at least once per shift to keep the glass of the gauge clean and ensure the water level is clear and correct. If any leakage is found in the glass gasket, tighten the filler. If the glass is blurry orWhen the water level is unclear and ineffective after flushing, it should be replaced. Each boiler is equipped with two water level gauges. If one of them is found to be damaged, it should be repaired immediatelyIf damaged, the boiler should be temporarily shut down immediately until both water level gauges return to normal before operation.
4. Water supply equipment:
⑴. All feedwater pumps should be checked for normal operation during shift handover, and any malfunctions should be repaired immediately.
⑵. Boiler feedwater should adopt continuous water inlet as much as possible, and control the phenomenon of fine water flow at the outlet valve of the water pump.
5. Steam pressure:
Regularly pay attention to pressure changes, try to maintain stable pressure inside the boiler, and never exceed the maximum allowable working pressure.
6. Pressure gauge:
The pressure gauge bend should be flushed once per shift to observe if the pressure gauge is normal. If any damage is found, the boiler should be shut down immediately for repair or replacement. The calibration and maintenance of the pressure gauge should comply with national standardsRegulations of the metrology department.
7. Safety valve:
Pay attention to whether the opening and closing of the safety valve are normal. In order to prevent the valve disc and seat of the safety valve from sticking, the lifting handle of the safety valve should be pulled regularly for exhaust testing. It should be raised once every 2-4 weeksConduct an exhaust test to verify the safety valve by measuring the air pressure.
8. Discharge valve: (discharge once per shift)
9. Normal operation:
⑴. The normal combustion conditions in the furnace should be a flat fire bed, dense and uniform bright yellow flames, no cold air piercing flames, neat and consistent burnout sections, and light gray smoke emitted from the chimney,The negative pressure of the chamber should be between 19.6-29.4 Pa, the evaporation rate should be around 2 tons/hour, and the exhaust temperature should be between 160 ℃ and 180 ℃.
⑵. It is necessary to continuously adjust the boiler load and combustion chamber operation according to the steam consumption situation to ensure the stability of boiler steam pressure. The steam department should strengthen communication with the boiler room and ensure that the steam consumption is sufficientWhen there is a change, it is best to notify the stoker half an hour in advance. When the boiler load increases, increase the induced draft first, then increase the supply air, and then speed up the grate speed. If necessary, increase the coal seam thicknessDegree.
When the boiler load decreases, first slow down the grate speed, then reduce the air supply, then reduce the induced draft, and if necessary, thin the coal seam thickness.
The increase or decrease of drum induced draft volume is mainly achieved by opening or closing the drum induced draft regulating valve. After adjustment, the furnace negative pressure should be maintained at 19.6-29.4 Pa.
⑶. The DZL2-1.25 boiler is suitable for burning bituminous coal, as well as low-quality bituminous coal, or a mixture of bituminous coal and anthracite coal. The best method is to burn bituminous coal or a mixture of low-quality bituminous coal and anthracite coal, and it is not advisable to burn coal shavings

(0-5mm) It is best to use coal that can be sieved, with a maximum coal block size of no more than 30mm. When bituminous coal or low-quality bituminous coal is mixed with anthracite coal, the coal should be layered and stacked to boil water before being lifted into the coal hopperMix evenly and avoid iron tools getting stuck in the grate when entering the furnace.
⑷. The thickness of the fuel layer and the speed of the grate are related to the properties of the fuel and the furnace load. Under normal operation, the thickness of the fuel layer for most fuels should not exceed 70-100 millimeters. Generally, for bituminous coal, the thickness of the fuel layer should not exceed 70-100 millimetersUsing thin coal seams for rapid combustion, the recommended coal seam thickness is 90-120 millimeters. When bituminous coal or low-quality bituminous coal and anthracite are co fired, the recommended coal seam thickness is 100-130 millimeters. The coal should be mined on rainy days when it is wetBurn slowly in thick coal seams.
The speed of the grate can be achieved through a speed control box.
⑸. After adjusting the coal seam thickness, it should not be moved too much. Only when the coal type is changed or the boiler load changes dramatically can the coal seam thickness be changed.
⑹. There should be no shortage of coal in the coal hopper, and the phenomenon of bridging the coal hopper should be eliminated at any time.
⑺. The higher the moisture content of the fuel, the longer the preparation time for ignition. For high volatile fuels (bituminous coal), in order to prevent combustion under the coal gate, the coal should be piled up and watered before being lifted into the coal hopperIt should be even, and the amount of watering should ensure that the ideal ignition and coal will not build a bridge in the coal hopper. Generally, it is advisable for a skilled hand to knead and form a loose ball, with a moisture content between 10% and 12%, except for burning smokeless coal aloneIn addition to watering, when burning bituminous coal or mixing inferior coal with anthracite, it is necessary to pile up and water it in advance.
⑻. When coal enters the furnace, it should ignite within a range of 0.2 meters from the coal gate. Under no circumstances should it burn under the coal gate, otherwise it is easy to burn the coal gate. If the fuelIt is considered 'de ignition' if the fire only starts at a distance of 2.4 meters from the coal gate.
⑼. If it is found burning under the coal gate, the amount of watering for the coal can be appropriately increased and the speed of the grate can be accelerated.
⑽. When "de ignition" occurs, use a fire hook at the left viewing hole to transfer the already burned coal to the newly entered fuel layer in the furnace, or add firewood to accelerate its ignition.
⑾. The coal seam should be completely burned about 0.5 meters in front of the eagle iron at the tail of the grate, and the ash should be dark red in color. A certain thickness of slag layer should be maintained at the tail to prevent the grate from being directly exposed to the flamesAttention should be paid regularly, and if a pile of red fire (including unburned carbon from dark red) is found on the eagle iron, immediately turn on the fire (pile the red fire forward) to allow it to burn completely.
⑿. When coking is found, coking should be carried out, and the coking block should not exceed 300 milligrams to ensure that the ash enters the slag removal machine smoothly. If large coking is found, the coal type should be changed. If coking occurs on the lower side wall of the front archOpen the ignition door for ignition.
⒀. When there is a flame or uneven height on the fire bed, it should be leveled and eliminated to ensure that the fire bed is flat.
⒁. Long term fire suppression should be avoided, as the two side plates of the furnace cannot receive sufficient cooling, which may result in the following drawbacks:
1. The grate is prone to overheating and may be damaged.
2. The plates on both sides of the grate are overheated and bent, causing the long pin of the grate to get stuck.
3. The long pin of the furnace grate is bent.
Within a short period of time (1-2 hours), the coal seam should be pressed 100 millimeters away from the coal gate to prevent burning out the coal gate.
⒂. During operation, attention should be paid to whether there are any special noises from the various components of the boiler. If there are, they should be checked immediately. If necessary, the boiler should be shut down for inspection. If the grate is stuck, it may cause overload of the speed control box and the safety clutchJumping, reaching automatic protection function, at this time, it should be checked and the fault should be resolved before continuing to operate.
⒃. The blockage of the grate may be caused by the following reasons:
1. The difference in the tightness of the adjusting nuts on the left and right sides of the grate is too large, resulting in severe deviation of the grate.
2. The grate arches at the sprocket shaft and gets stuck with the side sealing angle steel.
3. Due to iron objects, fragments of grate plates, and falling off countersunk screws, the grate plates are stuck.
4. The increased resistance caused by the coking of large blocks.
⒄. The degree of tightness between the grates
Generally, there is a total gap of about 10 millimeters between the left and right sides after being strung together. If it is too tight, it will cause the grate to arch and easily get stuck. If it is too loose and leaks too much coal debris, it is also not good. For the already installed grate, it can be left in a cold stateTighten the adjusting nut to prevent the grate from arching at the sprocket shaft. If arching still occurs, you can pull out a row of grate plates longitudinally or move the sprockets on both sides outward appropriately, and thenTighten the adjusting nut until it does not arch, and it should not be too tight. If there is arching during hot operation, the adjusting nut can still be tightened and the chain grate can be tightened to eliminate itUntil the phenomenon of arching occurs, the distance between the left and right sides must be equal during tightening and loosening to ensure consistent tightening and eliminate deviation.
⒅. Under normal circumstances, the front and rear windows of the furnace grate are fully closed, and the middle windows are fully open. Only when it is difficult to ignite and ignite the fuel, the first window should be opened appropriately. When a full bore fire occurs, the coke will burnThe tail window can only be opened when the carbon is not completely burned at the eagle's location.
⒆. When burning fuel with high ash content, the spiral slag extractor should be continuously operated to remove slag. The water level in the slag extractor cylinder should be kept within the range of the water level change of the water probe to prevent high-temperature coal slag from falling in and outDeformation occurs inside the slag machine, while also serving as a water seal to prevent cold air from leaking into the furnace.
⒇. The debris in the ash hopper can be recycled and mixed with coal to continue burning.
10. Cleaning inside the boiler room
The boiler room should be kept clean, and no other debris should be piled up in the boiler room.
⑵ Pay attention to indoor lighting, water level gauges, and pressure gauges so that the stoker can observe them clearly. Regularly inspect the surroundings of the boiler and check whether the boiler and its accessories are normal.
⑶ Keep the speed control box and sprocket bearing guide rail clean to prevent coal debris from accumulating and infiltrating into the interior of the machine, affecting normal operation.
11. Shift handover
In order to ensure the safe, reliable, and economical operation of each shift, the stoker should effectively carry out the following tasks during the shift handover:
The stoker who takes over the shift must arrive at the boiler room before the designated time and prepare for the shift.
⑵ The shift change stoker should achieve the following:
① The steam pressure and water level of the boiler are normal. Stable combustion in the furnace.
② All mechanical equipment is operating normally.
③ All accessories of the boiler (including pipelines, valves, and instruments) are safe, sensitive, and reliable.
④ The boiler room is clean and tidy, with bright lighting,
⑤ Both parties involved in the shift handover must ensure thorough and serious handover, and record the situations and issues encountered during the handover in the operation log book.
twenty-one. Water quality requirements:
The feed water of the boiler is generally treated with chemical treatment outside the boiler. When conditions do not permit, it is allowed to use chemical treatment inside the boiler. When adding chemicals to the boiler, it is necessary to prevent scaling, corrosion, and water quality issuesConduct supervision. The water quality requirements for boilers should comply with the relevant provisions of GB1576-2001 "Industrial Boiler Water Quality".
twenty-two Pollutant discharge:
Generally, boiler feedwater contains more or less minerals and sediment. After the feedwater enters the boiler and vaporizes, the minerals remain in the boiler. After being concentrated to a certain extent, they precipitate in the boiler,The higher the evaporation rate, the longer the operating time, and the more sediment there will be. In order to prevent boiler damage caused by scale and slag, it is necessary to ensure the quality of boiler water, and the alkalinity of boiler water should not exceed 12.5 milligramsEquivalent/liter, when exceeding the above range, the boiler water should be discharged.
When the testing conditions are not yet complete, general users can regularly discharge pollutants according to specific situations, such as once a day or once a shift.
Attention should be paid to the following matters when discharging pollutants:
If two or more boilers use the same discharge main pipe and there is no check valve on the discharge pipe for discharge, attention should be paid to:
⑴. It is prohibited to discharge two boilers simultaneously.
⑵. If another boiler is undergoing maintenance, the boiler under maintenance must be separated from the drainage pipeline before discharging.
2. Discharge should be carried out at low load and high water level, and close attention should be paid to the water level in the furnace during discharge. It is appropriate to lower the boiler water level by 25-50 millimeters each time.
3. If the sewage pipe section does not lead to the sewage box or sewage well, and there is no protective equipment, the sewage can only be discharged when it is known that there is no one near the end of the sewage pipe, in order to avoidAn accident occurred during the discharge process.
4. The specific operation during discharge is as follows:
Each boiler is equipped with two drain valves in series. When draining, first fully open the second valve (the one far away from the boiler), and then slightly open the other drain valve (the one closest to the lower manifold)Preheat the sewage pipeline and slowly open the first sewage valve after the pipeline is preheated. After the sewage is discharged, slowly close the first sewage valve first, and then close the second sewage valveThe purpose of this operation is to control the discharge with the first one to maintain the tightness of the second one. When the first one leaks, the second one can still be used to control the discharge. If any leakage is found in the discharge pipeline during dischargeIf there is an impact sound, the first drain valve should be immediately turned down until the impact sound disappears, and then slowly turned up. Discharge should not be continuous for a long time. To avoid affecting the water cycle.

5. After the discharge is completed, the discharge valve should be checked for tightness. The inspection method is to close the discharge valve for some time and then manually touch the pipeline behind the second discharge valve to see if it has cooled down. If notIf cooling occurs, there must be leakage in the drain valve.
twenty-three Shutdown:
1. Boiler shutdown generally occurs in three situations:
⑴. On weekends, holidays, or other occasions, the boiler should be temporarily shut down when steam is not used in the short term.
⑵. To clean, inspect or repair, the boiler must be shut down normally when the boiler water is drained.
⑶. In case of special circumstances, emergency shutdown is required for safety and reliability reasons.
The above three types of shutdowns have different requirements due to different situations. The specific explanations are as follows:
2. ①. Temporary shutdown: (also known as fire suppression) first reduce the air and coal supply, gradually decrease the load, and when the load drops to 0, close the induced draft fan and the main steam valve. Open the furnace door for a large amount of additionCoal will suppress the red fire, open the dust removal door to allow natural ventilation, and coal must be added to suppress any areas with red fire.
② Normal shutdown: After receiving the shutdown notice, the on duty stoker should reduce the load, stop coal feeding, stop air supply and induced draft fan, close the flue damper, and switch to natural ventilation to cool the furnace bodyChange the automatic water addition to manual.
After shutdown, there is still steam pressure in the boiler, and the boiler operator must not leave their post and continue to monitor the boiler.
Within 6 hours after normal shutdown, the furnace door and flue damper should be tightly closed to prevent rapid cooling of the boiler. After 6 hours, if necessary, the induced draft fan can be started to accelerate cooling. After 24 hours of shutdown, the boiler waterOnly when the temperature does not exceed 70 ℃, can all the boiler water be discharged. When draining water, the air valve should be opened or a safety valve should be lifted.
③ Emergency shutdown:
When encountering any of the following situations during boiler operation, emergency shutdown should be taken and relevant departments should be notified.
⑴. When the boiler water level is below the lowest visible edge of the water level gauge;
⑵. Continuously increasing the supply of water to the boiler and taking other measures, but the water level continues to decline;
⑶. The boiler water level exceeds the maximum visible water level (full water), but the water level cannot be seen even after draining;
⑷. All water supply machinery has failed or the water supply system has malfunctioned, preventing water from entering the boiler;
⑸. All water level gauges or safety valves have failed;
⑹. All pressure gauges set in the gas space have failed;
⑺. Damage to boiler components and endangering the safety of operating personnel;
Damage to combustion equipment or other serious threats to the safe operation of boilers;
Other situations that endanger the safe operation of the boiler.
The specific steps for emergency shutdown are as follows:
1. Immediately stop feeding coal and blowing air, close the air damper, and quickly remove the furnace fire.
After the fire is extinguished, open the smoke, windshield, furnace door, and ash door to cool the grate.
3. Urgently open the safety valve or emergency drain valve, reduce the steam pressure, and quickly cut off the boiler and steam main pipe.
twenty-four Maintenance and upkeep:
During the operation of the boiler, the following points should be noted:
⑴. It is not allowed to spray smoke into the furnace for positive pressure combustion, as it may easily damage the coal feeding valve.
⑵. If the induced draft fan vibrates violently, it should be stopped for inspection. Generally, it is caused by internal impeller wear and should be replaced.
⑶. There should be no water accumulation on the bottom floor of the boiler to prevent moisture from corroding the base.
2. The boiler should be inspected once every 2-3 weeks of operation.
⑴. Clean the accumulated ash in the convection tube bundle from the four bottom cleaning doors behind the boiler. If there is no dust accumulation, the opening time can be extended in the future, once a month. If there is still no dust accumulation, it can be extended to 2-Open once every 3 months, and at the same time check whether the dust cleaning door is tightly closed and whether there is any leakage at the pipe end. If there is, it should be welded in a timely manner.
⑶. Properly tighten the V-belt of the induced draft fan to prevent slipping during operation and reduce the wear of the belt caused by air volume and pressure.
⑷. Leakage should be repaired at the interface of the water level gauge, valve, and pipeline flange.
3. After every 3-6 months of operation, the boiler should be shut down for comprehensive inspection and maintenance. In addition to the tasks mentioned in 2 above, the following work must also be carried out:
⑴. Remove the scale and sludge inside the drum, water-cooled wall, and front, left, and right collection boxes, and rinse them clean with clean water.
⑵. Remove smoke and ash from the ignition surface of water wall pipes and boiler drums.
⑶. Check whether there is corrosion inside and outside the welded steel plate of the boiler. If there is a serious defect, it should be repaired immediately. If the defect is not serious, it can be left for repair during the next shutdown. If suspicious is found, it should be repaired immediatelyWhen it does not affect safety production, records should be made for future reference.
⑷. After inspection, boiler paint can be applied to the ignition surface to prevent corrosion.
⑸. Check if the rolling shaft of the induced draft fan is normal, and assess the degree of wear on the impeller and casing.
⑹. If necessary, remove the furnace wall and outer cover, moisture layer, etc. for thorough inspection. If serious damage is found, it must be repaired before continuing to use, and the inspection results should be reportedAnd the repair situation, fill in the boiler operation registration book.
4. The boiler insulation layer cover (outer sheath) and boiler base (including the drum induced draft duct) should be painted at least once a year.
5. Maintenance methods for boilers that are not used for a long time: there are two types: dry and wet. If the boiler is shut down for more than a month, dry maintenance method should be used, and if it is shut down for less than a month, wet maintenance method can be used.
⑴. Dry maintenance method:
After the boiler is shut down, drain the boiler water, thoroughly remove the internal dirt, rinse it clean, dry it in the furnace with low heat (be careful not to use high heat), and then remove the block shaped particles with a diameter of 10-30 millimetersArrange the quicklime in separate trays and place it inside the drum without allowing it to come into contact with metal. The weight of quicklime, calculated at 8 kilograms per cubic meter of drum capacity, is approximately 74 kilograms. Then, place the quicklime in the drumSome manhole and handhole pipeline valves are closed, and they should be checked every three months. If the composition of quicklime is broken, it needs to be replaced immediately. When the boiler is restarted, the quicklime and tray should be removed.
⑵. Wet maintenance method:
After the boiler is shut down, release the boiler water, thoroughly remove the internal dirt, rinse it clean, refill the treated water to full capacity, heat the boiler water to 100 ℃, and allow the gas in the water to be discharged outside the boilerThen close all valves. In cold climates, do not use moisturizing methods to prevent boiler water from freezing and damaging the boiler.
twenty-five. Inspection and hydrostatic testing of pressure components:
According to the "Regulations on Safety Technology Supervision of Steam Boilers", if any of the following situations occur in the boiler, internal inspection and water pressure test should be conducted on each pressure bearing component.
⑴. After new installation, modification, and relocation.
⑵. When it needs to be resumed after stopping running for more than a year.
⑶. After major repairs to the pressure bearing components.
⑷. When there are doubts about the equipment status based on the operation of the boiler and inspection is necessary.
2. Before inspection, safely shut down the boiler and thoroughly remove internal scale, external soot, and smoke stains. If necessary, remove the outer cover and moisture retaining material of the furnace wall. The key inspection points are as follows:
⑴. Whether the pressure bearing components are normal and whether there is any leakage.
⑵. Check for corrosion, groove deformation, and other phenomena inside and outside the boiler steel plate.
⑶. Whether the fire pipe is bent and whether there are cracks at the welding point between the pipe end and the pipe plate.
⑷. Check for bending, deformation, corrosion, and expansion of the water-cooled wall tubes.
⑸. Is there corrosion at the connection between the water supply pipe, sewage pipe, and drum.
3. If the corrosion is severe, strength calculation should also be done before conducting the hydrostatic test.
5. Water pressure test steps:
⑴ . Before the hydrostatic test, the inlet water temperature should be maintained at around 20 ℃ -30 ℃. If the temperature is too low, it may cause dew on the outer wall of the boiler, which can be confused with the occurrence of water seepage and other loose situations. Therefore, additional inspections should be conducted

Difficulty: If the temperature is too high, it can easily cause uneven expansion and relax the expansion opening. Moreover, if the surface temperature is too high, it can cause water droplets to evaporate and make the leakage difficult to detect.
⑵ . After the water is full, gradually increase the pressure to 0.4MPa and conduct a tightness check. If necessary, tighten the screws of the flange, manhole door, and handhole cover.
⑶. During the water pressure test, the water pressure should slowly rise. When the water pressure reaches the rated steam pressure of 1.25 MPa, the pressure rise should be paused to check for water leakage or abnormal phenomena. Then boost the voltage to

The test pressure is 1.65MPa. If the pressure does not decrease after 20 minutes, check when it drops to the rated steam pressure of 1.25MPa.
⑷. Any situation discovered should be recorded for repair when reduced to atmospheric pressure.
6. If the hydrostatic test meets the following conditions, it is considered qualified:
⑴. There are no water droplets or mist on the metal walls and welds of the pressure bearing components.
⑵. No residual deformation was found after the hydrostatic test.
7. Safety measures and precautions:
⑴. During hydrostatic testing, there should be particularly clear isolation signs around the testing site, and unauthorized personnel are not allowed to enter the testing area.
⑵. During the hydrostatic test, the operator shall not stand directly in front of the flange and valve.
⑶. Personnel unrelated to the hydrostatic test are not allowed to stand in the test area and stop to observe.
explain:
When users need to inquire about technical information about DZL boilers from the manufacturer, they should specify the contract number.
2. When inquiring about the manufacturing quality of boilers, the boiler number should be indicated.
If the boiler is transferred, all technical documents must be handed over simultaneously.