Zhengzhou individual customization of a small stainless steel high-pressure vessel

Key points for operating high-pressure reactors

1Before turning on the control panel current switch, the mixing switch and speed regulating heating switch should be set to zero first.
2. Before feeding, rinse the inner wall, stirring and bonding surface of the high-pressure reactor with mother liquor, and then slowly close the upper cover to avoid damaging the bonding surface.
3. When screwing on the screws, be sure to align them correctly and use a torque wrench to place them symmetrically in a cross shape to avoid uneven force distribution. Do not twist the screw into place at once, gradually apply force and tighten it symmetrically.
After tightening the screws, first use a mechanical pump to evacuate, then repeatedly introduce nitrogen gas two to four times to exhaust the air inside the kettle, then evacuate, introduce hydrogen gas, start stirring, heat up, and operate normally.
5. After the reaction is complete, stop stirring, pump out the residual hydrogen gas in the kettle, then introduce nitrogen gas, vent, and unscrew the screw to take a sample.
The 6.5L hydrogenation reactor is not resistant to strong acids, and strong acids such as hydrochloric acid, sulfuric acid, and nitric acid are prohibited in the reaction solution.
7. Operations that generate sparks and wearing nail shoes are prohibited near the hydrogenation reactor.
Also, I will provide you with the summary of other experts I saw yesterday to see if it is helpful to you
Detailed steps and methods for high-pressure catalytic hydrogenation
1. Rinse kettle
2. Open the kettle and put in the substrate
3. Close the kettle, add the palladium/carbon catalyst dissolved in the solvent into the kettle through a funnel feeding device, remove the feeding device, connect the hydrogen copper tube, and close the inlet and outlet ports
4. Close the pressure reducing valve and fully open the main valve of the hydrogen cylinder
5. Adjust the pressure reducing valve to 18 atmospheres
6. Open the air inlet, adjust the pressure inside the kettle to about 5 kilograms, close the air inlet, open the air outlet, adjust the pressure inside the kettle to about 2 kilograms, and close the air outlet; Open the air inlet again, adjust the pressure inside the kettle to about 5 kilograms, close the air inlet, and hold for about 15 minutes to see if there is any change in kettle pressure and inspect the airtightness of the kettle; Open the air outlet, adjust the pressure inside the kettle to 2 kilograms, and close the air outlet; Open the air inlet again to adjust the pressure to the hydrogenation pressure (about 15 kilograms), turn on the stirring, and slightly increase the temperature inside the kettle. As the reaction temperature increases after releasing heat, it is necessary to use jacket cooling water to adjust the temperature. Record the changes in temperature and pressure at intervals until the pressure no longer changes. (During the hydrogenation process, hydrogen should be continuously replenished. The specific replenishment procedure is: reduce the pressure from 15 to 10?, open the inlet valve to adjust the pressure inside the kettle to 15 kilograms again, close the inlet valve, and record the amount of hydrogen added at the same time.)
7. After the reaction is complete, close the main valve of the hydrogen cylinder, open the outlet valve of the kettle, adjust the pressure inside the kettle to about 3 kilograms, close the outlet valve, open the inlet valve, then close the inlet valve, open the outlet valve, adjust the pressure inside the kettle to about 3 kilograms, close the outlet valve until the pressure value of the pressure reducing valve reaches safety, and remove the inlet device.
8. Connect the discharge device and open the intake valve to release the hydraulic pressure of the material inside.

Operating procedures for small hydrogenation kettle
1、 Installation
1. Check if all pipe fittings and fasteners are loose and securely fastened, and check if all instruments are malfunctioning.
2. Airtightness test: The medium should be nitrogen and other inert gases, and the experimental pressure should be 1-1.5 times the working pressure. Boosting must be carried out in stages, with a spacing of 0.25 times the working pressure. Each stage should be stopped for five minutes. When it reaches the test pressure, it should be stopped for 30 minutes. If any leakage is found, the pressure should be reduced and repaired before conducting the test.
2、 Operation
Firstly, connect the inlet and outlet water pipelines of the cooling water jacket on the mixing bearing seat and conduct a temperature and pressure rise test. The heating rate is generally not greater than 80 ℃/h, and the test pressure and temperature should be 50% of the rated value. There should be no leakage or other abnormal noise.
3、 Reaction operation
1. WillPressure vesselClean the inner wall of the kettle body, intake pipe, grounding pipe, cooling coil, and mixing equipment thoroughly (using liquid cleaning, do not use hard objects to scrape off the surface to prevent damage).
2. Add the reaction materials into the kettle in sequence, and clean the sealed contact surface between the kettle body and lid with solvent and filter paper.
3. Move the kettle cover above the kettle body and slowly cover it, without colliding with the sealing surface. After covering the kettle lid. Place the gasket on top and tighten the bolt according to the number. Use a torque wrench to gradually tighten the bolt diagonally and symmetrically in multiple steps. When tightening bolts, apply even force and do not exceed a tightening torque of 100N. M.
4. After tightening the kettle cover, close the intake valve and the grounding pipe valve, and check if the pressure reducing valve is in the closed state,
Then open the gas cylinder and pressure reducing valve in sequence, replace the air in the kettle with nitrogen three times, and then replace the nitrogen in the kettle with hydrogen three times. Fill the kettle with the required hydrogen pressure for the reaction, and close the inlet valve, gas cylinder valve, and pressure reducing valve.
5. Open the cooling water.
6. Adjust the given value of the temperature indicator regulator and turn on the heating switch? Adjust the heating knob to adjust the heating speed. After the temperature reaches the given value, the output voltage will be completely disconnected to achieve the purpose of constant temperature. After heating, adjust the heating voltage to zero and turn off the heating switch to ensure the safe operation of electrical components.
7. Rotate the stirring to zero position, turn on the stirring power switch, and adjust the stirring potentiometer to adjust the stirring speed. When stopping mixing, the potentiometer should be turned and the mixing switch should be turned down to ensure the safe operation of electrical components.
8. After the reaction is complete, stop heating and let the temperature drop to room temperature. Stop stirring and turn off the cooling water. Release the pressure inside the kettle and replace the residual hydrogen gas with nitrogen gas. Use a torque wrench to symmetrically and evenly remove the bolts, slowly lift the kettle cover and place it on the bracket. After removing the materials from the kettle, clean all parts of the kettle body with solvent for later use.
4、 Precautions
1. The heating and cooling of the kettle body shall not be carried out by rapid cooling and rapid heating methods. The heating rate is generally not greater than 80 ℃/h, and air cooling or air cooling can be used for cooling.
2. When using direct heating method to raise the temperature, the heating rate must be reduced before reaching the operating temperature to prevent overheating.
3. The needle valve system is sealed with a thread, and good sealing can be achieved by gently rotating the valve needle. Excessive force is prohibited to avoid damaging the sealing surface.
4. The high-pressure reactor and control instrument must be grounded for safe use.

Proper and reasonable operation of pressure vessels is an important measure to ensure safe operation, because even if the design of the vessel meets the requirements and the manufacturing and installation quality is excellent, improper operation can still cause pressure vessel accidents.
As the main equipment in the petrochemical production process, pressure vessels must ensure their safe operation by:
1、 Smooth operation
The frequent changes and significant fluctuations in pressure during the operation of pressure vessels are detrimental to their fatigue resistance. The operating pressure should be kept as stable as possible. At the same time, the container should also avoid sudden changes in shell temperature during operation to prevent excessive temperature stress.
Pressure vessel loading(Boosting and warming up)And uninstall(Reduce pressure and temperature)At this time, the speed should not be too fast, to preventpressureOr rapid temperature changes in a short period of time can have adverse effects on the container.
2、 Prevent overloading
Preventing overloading of pressure vessels mainly involves preventing overpressure. The feeding amount and reaction temperature of the reaction vessel should be strictly controlled to prevent the reaction from getting out of control and causing overpressure in the container. When filling the storage container with feed, strict measurement should be carried out to prevent overloading and prevent the material from expanding due to heat and causing overpressure in the container.
3、 Status monitoring
Pressure vessel operators should continuously monitor the working condition of the vessel during operation, promptly detect any abnormal situations that occur during vessel operation, and take corresponding measures to ensure safe operation. The supervision and control of container operation status mainly focus on process conditions, equipment conditions, safety devices, and other aspects.
(one)process conditions
Mainly check whether the operating pressure, temperature, liquid level, etc. are within the range specified in the operating procedures; Whether the chemical composition of the working medium inside the container meets the requirements, etc.
(two)Equipment Status
Mainly inspect the container body and its directly connected parts such as manholesvalveAre there any deformations, cracks, leaks, corrosion, or other defects or suspicious phenomena in the flange, pressure, temperature, and liquid level instrument connections; Check for vibration and wear of containers and their connecting pipelines and other equipment; equipment insulation(cold insulation)Whether it is intact or not.
(three)safety device
Mainly inspect the integrity of various safety accessories and measuring instruments, such as whether they are inaccurate or blocked; Whether the interlocking and alarm are reliably put into use, whether they are within the allowable use period, and whether the outdoor equipment is frozen in winter.
4、 Emergency shutdown
When any of the following abnormal phenomena occur in a pressure vessel, the operator should immediately take emergency measures and report to the relevant departments of the unit according to the prescribed procedures. These phenomena mainly include:
(1)Work pressure, rapid changes in medium, medium temperature or wall temperature exceeding allowable values, measures taken but still unable to achieve effective control;
(2)Defects that endanger safety, such as cracks, bulges, deformations, and leaks, occur in the main pressure bearing components;
(3)Security attachment failure;
(4)Damaged takeover and fasteners make it difficult to ensure safe operation;
(5)The occurrence of a fire directly threatens the safe operation of pressure vessels;
(6)Overfilling;
(7)Loss of control over liquid level;
(8)Severe vibration of pressure vessels and pipelines poses a threat to safe operation.

prepare

Connect the power supply of the reaction vessel and air pump;

Unscrew the bolt of the card sleeve on the reverse kettle, open the kettle cover, add the reactants, and be careful not to add more than 3/4 of the kettle volume;

Slowly close the kettle body and lid to align the upper and lower interfaces of the reaction kettle. After appropriate adjustments, ensure that the PTFE gasket matches the groove perfectly. Otherwise, repeat the above operation;

Install the reaction vessel sleeve between the reaction vessel body and the vessel cover. First, use a small wrench to diagonally tighten the bolts, and then use a large wrench to tighten them (be careful not to apply too much force when using a large wrench). Reaction (under pressure)

Check whether all valves (upper exhaust valve, kettle exhaust valve, inlet valve, kettle discharge outlet valve, etc.) are tightened (hold on firmly, do not apply too much force), turn on the power supply and display switch of the control box;

Open the main valve and pressure divider valve of the nitrogen cylinder, first adjust the pressure of the pressure divider valve to the required pressure for the experiment, then open the inlet valve of the reaction kettle to slowly fill the gas into the reaction kettle. When the pressure value displayed on the reaction kettle is the same as the set pressure on the nitrogen cylinder and no longer changes, sequentially close the inlet valve of the reaction kettle and the outlet valve of the nitrogen cylinder;

Open the reaction vessel

Turn on the cooling water and adjust the stirring speed;

After checking that the thermocouple has been inserted, turn on the heating switch and run the heating program;

After the reaction begins, it is important to closely monitor the changes in various parameters (pressure, temperature, speed, torque) during the reaction, especially the changes in pressure

post-processing

Stop reaction:

(1) Set the temperature to room temperature and let it cool naturally;

(2) Open the exhaust valve above the reaction vessel and slowly reduce the pressure to zero on the pressure gauge;

(3) Close the exhaust valve, open the bolt of the reaction kettle sleeve, open the kettle cover, and remove the reaction product.

Cleaning the reaction kettle: The reaction kettle should be strictly cleaned after each experiment. Check if the upper and lower interfaces of the reaction kettle are aligned, adjust appropriately, slowly close the kettle body and kettle cover, clamp the sleeve tightly but do not turn the bolt, adjust the reaction kettle to its pre reaction state, and check if all valves are tightly closed. Attention should be paid to strictly follow the "Safety Regulations for High Temperature and High Pressure Reactors" when operating the reactor, and it is not allowed to operate it alone. Two or more people are required during the experiment. During the experiment, it is necessary to supervise the post and never leave without authorization. Before using the reaction vessel, the supervisor should be notified and the experimental operation should be carried out under the supervision of the supervisor. Before use, check whether all valves are unobstructed, especially the pipe openings of the pressure gauge and explosion-proof membrane. Do not tighten the valve too tightly as it may damage the valve. After the experiment is completed, the bolts of the reaction kettle sleeve can be tightened to prevent sticking and inability to separate the kettle body and lid.

Installation and use of high-pressure vessel:

The high-pressure reactor should be placed in a high-pressure operating room that meets explosion-proof requirements. If multiple high-pressure reactors are equipped, they should be separated and separated by a feasible wall between each two. Each operating room should have an outlet directly leading to the outside or passage. The high-pressure reactor should have reliable grounding.

When installing the lid, first place the sealing ring, and then carefully place the lid in the fixed position on the container body. The sealing ring made of pure copper is in contact with the kettle body and lid using a conical surface sealing form. The main bolt is tightened to press them tightly against each other, achieving the purpose of sealing. The sealing surface should be taken special care of. When tightening the main bolt, the specified tightening torque should not be exceeded to prevent the sealing surface from being crushed or accelerated wear. After the sealing surface is damaged, it needs to be reprocessed and repaired in order to restore good sealing performance. When tightening the bolts, they must be tightened diagonally and symmetrically in multiple steps, with even force. It is not allowed for the kettle cover to tilt to one side to achieve a good sealing effect. All threaded connections must be coated with oil or oil mixed with graphite during assembly.

Heating and pressure sealing test, the test medium can be air or nitrogen, but it is better to use inert gas. It is strictly prohibited to use oxygen or other flammable and explosive gases. Heating and boosting must be done slowly. The heating rate shall not exceed 80 degrees per hour. During pressure testing, connect the inlet valve of the high-pressure reactor to the compressor (or high-pressure pump) using a connecting pipe. The pressure rise must be carried out in stages, with a spacing of 20% of the working pressure. Each stage should be held for 5 minutes, and when it reaches the test pressure, it should be held for 30 minutes to check the sealing condition. The test pressure is 100-105% of the working pressure. If a leak is found, the pressure should be reduced first, and then the nut and joint should be tightened appropriately. It is strictly prohibited to tighten the nut and joint under high pressure.

Precautions for Heating and Cooling of Autoclave

Prohibit rapid cooling and heating to prevent excessive temperature stress from causing cracks in the kettle body. After the operation is completed, water cooling (exothermic reaction) or air cooling can be used. The needle valve system is sealed with a thread. Simply rotate the valve needle gently and press the sealing surface tightly to achieve good sealing. Do not use excessive force to avoid damaging the sealing surface. After the reaction is complete, cool down first, then release high-pressure gas from the kettle to reduce the pressure to atmospheric pressure, and then symmetrically and evenly loosen and remove the bolts. During the process of removing the cover, special attention should be paid to protecting the sealing surface. After each operation, the residue on the kettle body and lid should be removed. All sealing surfaces on the high-pressure kettle should be cleaned regularly and kept dry. It is not allowed to use hard objects or soft objects with rough surfaces for cleaning. The mixer needs to be removed and cleaned

Notes:

1During the operation of the high-pressure reactor, turn on the ventilation fan to ensure good ventilation.

2When there is pressure inside the kettle, it is strictly prohibited to twist the nut or tap the high-pressure kettle.

3At the connection of the positive and negative nuts, only the nuts should be rotated, and the two sealing surfaces should not rotate relative to each other.

4Observe the reading of the pressure gauge at all times during operation, and it is strictly prohibited to use the kettle under conditions of overheating and overpressure.

5If there is any air leakage during the experimental process, immediately stop heating and the experiment. It is strictly prohibited to twist the nut at high temperatures.

6Do not leave the experimental process.

7Before using the kettle, anyone must read the instructions carefully.

8Approval from the responsible person is required before use.

Key operating points of high-pressure hydrogenation kettle:

1Before turning on the control panel current switch, the mixing switch and speed regulating heating switch should be set to zero first.

2Before feeding, rinse the inner wall, mixing and bonding surfaces of the autoclave with distilled water. After rinsing the bonding surfaces, wipe them clean with cotton or silk dipped in ethanol, and then slowly close the lid to avoid damaging the bonding surfaces.

3When tightening the screws, be sure to align them correctly and use a torque wrench to place them symmetrically in a cross shape to avoid uneven force distribution. Do not twist the screw into place at once, gradually apply force and tighten it symmetrically.

4After tightening the screws, first use a mechanical pump to evacuate, then repeatedly introduce nitrogen gas two to four times to exhaust the air inside the kettle, then evacuate, introduce hydrogen gas, start stirring, heat up, and operate normally.

5After the reaction is complete, stop stirring, pump out the residual hydrogen gas in the kettle, then introduce nitrogen gas, vent, and unscrew the screw to take a sample.

6The 5L hydrogenation reactor is not resistant to strong acids, and strong acids such as hydrochloric acid, sulfuric acid, and nitric acid are prohibited in the reaction solution.

7Near the hydrogenation reactor, operations that generate sparks are prohibited, and wearing nail shoes for operation is also prohibited.

Experience: Detailed steps and methods for high-pressure catalytic hydrogenation

1Rinse the kettle

2Open the kettle and put in the substrate

3Close the kettle, add the palladium/carbon catalyst dissolved in the solvent into the kettle through a funnel feeding device, remove the feeding device, connect the hydrogen copper tube, and close the inlet and outlet ports

4Close the pressure reducing valve and fully open the main valve of the hydrogen cylinder

5Adjust the pressure reducing valve to 18 atmospheres

6Open the air inlet, adjust the pressure inside the kettle to about 5 kilograms, close the air inlet, open the air outlet, adjust the pressure inside the kettle to about 2 kilograms, and close the air outlet; Open the air inlet again, adjust the pressure inside the kettle to about 5 kilograms, close the air inlet, and hold for about 15 minutes to see if there is any change in kettle pressure and inspect the airtightness of the kettle; Open the air outlet, adjust the pressure inside the kettle to 2 kilograms, and close the air outlet; Open the air inlet again to adjust the pressure to the hydrogenation pressure (about 15 kilograms), turn on the stirring, and slightly increase the temperature inside the kettle. As the reaction temperature increases after releasing heat, it is necessary to use jacket cooling water to adjust the temperature. Record the changes in temperature and pressure at intervals until the pressure no longer changes. (During the hydrogenation process, hydrogen gas should be continuously replenished. The specific replenishment procedure is: reduce the pressure from 15 to 10, open the inlet valve to adjust the pressure inside the kettle back to 15 kilograms, close the inlet valve, and record the amount of hydrogen gas replenished.)

7After the reaction is complete, close the main valve of the hydrogen cylinder, open the outlet valve of the kettle, adjust the pressure inside the kettle to about 3 kilograms, close the outlet valve, open the inlet valve, then close the inlet valve, open the outlet valve, adjust the pressure inside the kettle to about 3 kilograms, close the outlet valve until the pressure value of the pressure reducing valve reaches safety, and remove the inlet device.

8Connect the discharge device and open the intake valve to release the hydraulic pressure of the material inside.

2.8The selection, wiring, and grounding of electrical equipment should comply with the production regulations of the national "Electrical Safety Regulations for Explosive Hazardous Areas".
2.9Hydrogen supply stations should have lightning protection measures.
3.10pressGB 2894—82According to the regulations of the Safety Signs, no fire signs should be set up around the hydrogen supply station.
3Hydrogen supply setting
3.1Hydrogen cylinder
The design, manufacturing, and inspection of hydrogen cylinders shall comply with the requirements of the Gas Cylinder Safety Supervision Regulations.
3.2Container Bottle
3.2.1The total weight of each unit shall not exceed2Ton. The safety factor of container fixtures and lifting rings shall not be less than9Gas cylinders, pipelines, valves, and joints should be fixed and not loose or displaced. Pipelines and valves should have protective devices to prevent collisions.
3.2.2The main pipeline should have two valves connected in series, and each group of gas cylinders should have separate valves.
3.3Fixed volume gas storage tank
3.3.1Gas storage tanks should be equipped with vent valves, safety valves, and pressure gauges. High work pressure greater than or equal to1kilogram/Centimeters ^2At that time, its design, manufacturing, and inspection should comply with the requirements of the "Pressure Vessel Safety Supervision Regulations".
3.3.2The foundation and support of the gas storage tank must be firm and non combustible.
3.3.3The ground of the gas storage tank should be higher than the ground of the adjacent Class A and Class B production units that emit flammable gases and vapors. Otherwise, a height of not less than1The physical wall of the meter is isolated.
3.3.4The fire separation distance for the flat layout of gas storage tanks shall be determined according toIJ46-74The relevant regulations on fire separation distance for medium combustible gas storage tanks shall be implemented.
3.4pipeline
3.4.1Pipelines and accessories should be selected from products that comply with national standards and specifications, and should be suitable for the requirements of hydrogen working pressure and temperature. Seamless metal pipes should be used for hydrogen pipelines, and the use of cast iron pipes is prohibited.
3.4.2The connection of pipelines should generally be made by welding or other effective methods to prevent air leakage.
3.4.3Exhaust pipes, sampling ports, and blowing ports should be installed on the pipeline, and their positions should meet the requirements of gas blowing and replacement inside the pipeline.
3.4.4When hydrogen is used for welding, cutting, fuel, and shielding gas, each unit(group)Fire arresters should be installed on the branch pipes of hydrogen equipment.
3.4.5The pipeline laying should meet the following requirements:
3.4.5.1Hydrogen pipelines should be laid overhead, and their supports should be non combustible. Overhead pipelines should not be laid on the same support as cables or conductive wires.
When the hydrogen pipeline is laid parallel to the gas pipeline and oxygen pipeline, there should be a non combustible material pipeline in between, or the net distance should not be less than250Millimeters. When laying in layers, the hydrogen pipeline should be located above.
The small clearance distance between hydrogen pipelines and buildings, structures, or other pipelines can be implemented in accordance with relevant regulations.
3.4.5.2Indoor pipelines should not be laid in trenches or directly buried underground. For pipelines laid in outdoor trenches, measures should be taken to prevent hydrogen gas leakage, accumulation, or entering other trenches. The burial depth of buried pipelines should not be less than0.7Rice. Pipelines containing wet hydrogen gas should be laid below the frozen layer.
3.4.5.3When pipelines pass through walls or floors, sleeves should be installed. The pipe section inside the casing should not have welds, and non combustible materials should be used to fill the gap between the pipeline and the casing.
3.4.5.4Pipelines should avoid passing through ditches, sewers, railways, highways, etc. When it is necessary to pass through, sleeves should be installed.
3.4.5.5Pipelines shall not pass through living rooms, offices, power distribution rooms, instrument rooms, stairwells, and other rooms that do not use hydrogen gas. Not suitable for passing through suspended ceilings, technology(clip)Layer, when it is necessary to pass through the ceiling or technology(clip)When laying layers, safety measures should be taken.
3.4.6Indoor and outdoor overhead or buried pipelines, busbars, and their connected gas cylinders should be cross connected and grounded to each other, and the cross connection and grounding measures should be implemented in accordance with relevant national regulations.
3.5blowdown pipe
3.5.1The venting valve, safety valve, and pipeline system of hydrogen storage tanks should all be equipped with venting pipes.
3.5.2The vent pipe should be made of metal material and plastic or rubber pipes are not allowed to be used.
3.5.3Fire arresters should be installed in venting pipes, and if conditions permit, they can be connected to fire extinguishing steam or inert gas pipelines to prevent ignition.
3.4.4The outlet of the indoor vent pipe should be higher than the roof2Above meters. The vent pipe of outdoor equipment should be higher than that of nearby high equipment operated by people2Above meters.
3.5.5The vent pipe should be grounded with static electricity and within the lightning protection range.
3.5.6Measures should be taken to prevent rain and snow from entering and foreign objects from blocking the exhaust pipe.
4Key points for safe operation of hydrogen system
4.1The oxygen content of hydrogen input into the system shall not exceed0.5%.
4.2During the operation of the hydrogen system, it is not allowed to strike, repair or tighten under pressure, overpressure, or negative pressure.
4.3When pipelines, valves, and water seal devices freeze, they can only be thawed by heating with hot water or steam, and it is strictly prohibited to use open flames for baking.
4.4Leakage inspection of connection points such as equipment, pipelines, and valves can be carried out using soap water or portable combustible gas explosion-proof detectors, and the use of open flames is prohibited.
4.5No hydrogen emissions are allowed indoors. Blowing and replacement, venting and pressure reduction must be discharged through a venting pipe.
4.6When a large amount of hydrogen leaks or accumulates, the gas source should be immediately cut off, ventilation should be carried out, and all operations that may cause sparks should not be carried out.
4.7Newly installed or overhauled hydrogen systems must undergo pressure tests, cleaning, and air tightness tests to meet relevant inspection requirements before they can be put into use.
4.8The hydrogen system can be purged and replaced using nitrogen gas(Or other inert gases)Substitution method or water injection and exhaust method.
The nitrogen displacement method should meet the following requirements:
4.8.1The oxygen content in nitrogen shall not exceed3%.
4.8.2Replacement must be done * to prevent residual gas at the dead end.
4.8.3After the replacement is completed, the oxygen or hydrogen content in the system must be analyzed and qualified for three consecutive times.
4.9The hot work maintenance of the hydrogen system must ensure that the high content of hydrogen inside the system and in the hot work area does not exceed0.4%.
4.10Prevent open flames and other sources of ignition. Prohibit the use of tools and hot objects such as electric stoves, drills, stoves, and blowtorches that generate open flames and high temperatures; Do not bring fire into the no fire zone; Choose copper or beryllium copper alloy tools; Wear anti-static shoes made of cotton work clothes.
5Hydrogen cylinder usage
5.1Due to production needs, it is necessary to be on site(indoor)The number of gas cylinders used shall not exceed5Bottles should meet the following requirements:
5.1.1Same ventilation conditions2.7Article.
5.1.2The distance between hydrogen cylinders and containers and cylinders containing flammable, explosive, combustible substances, and oxidizing gases should not be less than8Rice.
5.1.3The distance between open flames or ordinary electrical equipment should not be less than10Rice.
5.1.4The distance between the air conditioning unit, air compressor, ventilation equipment and other suction ports should not be less than20Rice.
5.1.5The distance from other flammable gas storage locations should not be less than20Rice.
5.1.6A bracket with fixed gas cylinders.
5.1.7Gas cylinders used in multi-storey buildings should generally be arranged on the top floor near the outer wall, except for special production needs.
5.2Use gas cylinders and do not strike or collide; Do not approach heat sources; During summer, exposure to sunlight should be avoided.
5.3The pressure regulator that must be used should be opened with the operator standing behind the valve port and moving gently and slowly.
5.4Do not continue to use valves or pressure reducers when they leak; When the valve is damaged, it is strictly prohibited to replace the valve under pressure inside the bottle.
5.5The gas inside the bottle must not be used up and should be retained0.5Kilogram force/Centimeters ^2The above residual pressure.
6firefighting
6.1Hydrogen supply stations should comply withTJ 16-74According to relevant regulations, fire-fighting water should be provided and equipped as needed“dry powder”、“1211”and“carbon dioxide”Waiting for lightweight fire extinguishing equipment or nitrogen or steam fire extinguishing systems.
6.2The following measures should be taken for hydrogen ignition:
6.2.1Cut off the gas source.
6.2.2Cooling and isolation to prevent the spread of fire.
6.2.3Maintain positive pressure in the hydrogen system to prevent backfire.
6.3Hydrogen flames are not easy to detect, and rescue personnel should prevent exposed skin burns.