Regulations for the Use of Permanent Magnet Rotating Stirring High Pressure Vessels

　　purpose

In order to evaluate the corrosion rate, this regulation is formulated.

　　scope

Applicable to the evaluation of corrosion rate under dynamic, static, and pressurized conditions for a certain working condition, material, or agent.

　　equipment

FYXJ2 · 20/150 permanent magnet rotary stirring high-pressure vessel.

　　operating steps

4.1 High pressure vessel operation

4.1.1 Open the high-pressure kettle cover and remove the liner cup, then rinse it with water sample.

4.1.2 Measure 1000-1200ml of water sample with a measuring cylinder, add a certain amount of corrosion inhibitor according to the requirements, and stir well.

4.1.3 Place the liner cup into the high-pressure vessel, hang the cleaned new hanging piece on the hook, and turn the wrench to lower the upper cover of the high-pressure vessel.

4.1.4 Tighten the nut evenly and symmetrically with force; Check for air leakage, tighten the screw nut at the leak location, and press the mixing button to start the experiment.

Before the start of the experiment, deoxygenate the solution with CO2 for 2 hours; After closing the kettle, deoxygenate with CO2 for 10 minutes.

After deoxygenation is completed, CO2 is introduced and the temperature and pressure are raised to the design temperature and pressure, and timing begins.

4.1.7 After the experiment is completed, stop stirring and open the high-pressure reactor to remove the hanging pieces for cleaning and weighing.

4.1.8 After the experiment is completed, clean the liner cup and hook inner kettle cover as required to prepare for the next experiment.

4.2 Connection between high-pressure gas cylinder and high-pressure kettle

4.2.1 Connect the inlet and outlet of the high-pressure gas pipe to the high-pressure reactor and high-pressure gas cylinder respectively.

4.2.2. Open the inlet valve of the high-pressure reactor, close the outlet, open the pressure reducing valve of the high-pressure gas cylinder, and introduce air to the required pressure.

4.2.3 Close the inlet valve and the pressure reducing valve of the high-pressure gas cylinder.

4.2.4 If the pressure inside the kettle is higher than the pressure of the gas cylinder, use a nitrogen pressurization system

4.3 Nitrogen Boosting System

Before using the system, connect it according to the schematic diagram of the nitrogen pressurization system and check for any errors.

4.3.2 Connect the power to the air compressor, turn off the air outlet switch, and turn on the air compressor start switch. At this time, the air compressor will start working. When the pressure rises to 0.8 MPa, the air compressor will stop working.

4.3.3 Nitrogen pressurization preparation, check whether the main seal and valve are in a sealed state, check whether the system connection is correct, and then open the connection valve between the reaction kettle and the booster pump.

4.3.4 Open the nitrogen cylinder, apply a pressure of 1MPa~3.5MPa through the pressure reducing valve, and adjust according to the pressure increase situation.

4.3.5 Nitrogen pressurization begins. After the above preparations are completed, turn on the air compressor exhaust switch (the purifier switch is turned on). At this time, the booster pump is working. Observe the pressure gauge reading of the reaction kettle. The maximum working pressure of the reaction kettle is 20MPa, which cannot exceed this limit.

When the nitrogen is pressurized to the required pressure, first turn off the nitrogen, then turn off the gas phase valve of the reaction kettle, and finally turn off the outlet switch of the air compressor.

4.4 Control cabinet operation steps

4.4.1 Refer to the wiring diagram to connect the high-pressure reactor and controller leads, check for accuracy before power can be transmitted.

4.4.2 First, turn on the main power switch on the front panel of the controller, connect the main power, and the power indicator light will turn on.

Before the power switch and mixing switch on the panel are turned on, the heating adjustment knob and mixing adjustment knob should be turned left to the zero position to avoid excessive starting current during startup and burning out the thyristor components.

4.4.4 Turn on the heating switch on the panel, and the temperature gauge will start displaying the temperature inside the kettle. At this time, you can turn on the "measurement setting" of the instrument, switch to the set position, adjust the potentiometer to the control temperature of the high-pressure kettle, and then turn the "measurement setting" to the measurement position. When the temperature inside the kettle is lower than the set value, the green light of the instrument will turn on. At this time, adjust the heating knob on the panel and observe the indication of the heating voltage gauge from small to large. When the temperature inside the kettle is set high, the heating voltage can be adjusted larger. When the temperature inside the kettle is set low, the heating voltage can be adjusted smaller. This can reduce the temperature surge of the high-pressure kettle and improve the temperature control accuracy of the high-pressure kettle. When the temperature inside the kettle is higher than the set value, the instrument will turn on the green light. The red light is on, and the heating power is automatically cut off to gradually return the temperature to the set value, Repeat this process to achieve temperature control of the high-pressure reactor.

4.4.5 Mixing speed control, turn on the mixing power switch, connect the mixing power, adjust the mixing speed adjustment knob, observe the speed instrument display from small to large, and adjust it to the desired speed.

After use, turn the speed and adjustment knobs left to the zero position, and then turn off the mixing, heating, and electricity in sequence

4.5 Fill in the Equipment Operation Record.

　　5 Precautions

5.1 Installation and use of high-pressure reactor

5.1.1 The installation environment should meet the installation conditions of the high-pressure reactor. When there are flammable and explosive media present, good ventilation should be ensured at the equipment grounding point.

5.1.2 Installation of kettle cover: During loading and unloading, it should be moved slowly to prevent damage to the sealing surface due to impact. Then, the nuts should be placed in their corresponding positions, and the randomly matched torque wrench should be used to gradually tighten the nuts in the diagonal direction multiple times until there is no leakage. The tightening torque should be evenly applied. If the main sealing surface still leaks after normal operation, the tightening torque can be appropriately increased (within 20%).

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

5.1.4 Opening of the kettle: After the operation is completed, first reduce the temperature inside the kettle. After the pressure drops to zero, gradually unscrew the nut in the diagonal direction multiple times, and then slowly move the hydraulic device until the kettle cover leaves the sealing port, and then remove the kettle cover.

5.1.5 For safety reasons, the heating furnace and control console should be grounded

5.2 Precautions for controllers

5.2.1 Avoid moisture. Before each operation, carefully check for any abnormal phenomena and whether the temperature setting is accurate. During normal operation, do not touch the rear panel to prevent contact with live parts.

5.2.2 Calibration of instruments that require calibration should be carried out regularly to ensure accurate and reliable operation.

5.2.3 Speed display and speed calibration are generally calibrated in conjunction with high-pressure reactors. After one year of use, users can use a tachometer to calibrate themselves by adjusting the speed calibration knob on the distribution board.

5.2.4 The leads of the motor must be correct and error free. Before starting up, the speed control knob must be turned left to zero position to avoid burning out the thyristor and diode components on the speed control board at the moment of starting up.

5.3 Other precautions

5.3.1 It is strictly prohibited to knock or twist the nuts and joints of high-pressure reactors working under pressure.

5.3.2 It is strictly prohibited for the kettle to work under overpressure or overheating conditions. Frequently use up to 80% of the lower limit pressure of the blasting valve.

5.3.3 Avoid rapid cooling to prevent excessive stress concentration from causing damage to the kettle.

5.3.4 After the lead seal of the blasting valve is sealed, it is strictly prohibited to open it. When replacing the disc, attention should be paid to the direction "mark" on the pressure ring.

When the kettle is not in use for a long time, the inside and outside of the kettle should be cleaned and wiped clean without water, and stored in a clean, dry, and non corrosive place.

5.3.6 If there is abnormal noise inside the casing during operation, the machine should be stopped to release pressure. Check the mixing system for any abnormal conditions. Refer to the assembly drawing to remove the mixing slurry, unscrew the "compression nut", remove the inner magnet component, check if the bearing is damaged, and replace the bearing (spare part) according to the damage situation. When the needle valve wears out and leaks, the valve needle and packing can be removed and replaced.

5.3.7 When the high-pressure reactor is not in operation, the main switch should be closed to prevent leakage accidents.

　　6 Maintenance steps

6.1 Line maintenance

6.1.1 Regularly check whether the connecting lines are loose, tangled, or detached to prevent any impact on use or unexpected situations.

6.1.2 Regularly check whether each dial of the control cabinet displays normally.

6.2 Cleaning and Maintenance

6.2.1 Keep the kettle body and interior clean, especially the kettle lid and inner kettle edges. After each experiment, they must be cleaned with water and wiped with alcohol to ensure the airtightness of the kettle.

6.2.2 Clean the workplace to ensure sufficient operating space around the high-pressure reactor.

6.3 Maintenance cycle (operation steps as above)

6.3.1 Check whether the heat transfer oil in the oil tank is consumed every three months, or replenish it in a timely manner to ensure that it reaches the specified liquid level.

6.3.2 Replace the heat transfer oil once a year to ensure heating speed and accuracy.

6.3.3 The pressure gauge used for the high-pressure reactor shall be inspected every six months.

　　related documents

7.1 "Instructions for Use of FYXJ2 · 20/150 Permanent Magnet Rotating Stirring High Pressure Reactor"

　　Related records

8.1 Equipment Operation Record OTSC-OCBC-EM-R004 (A/0)

8.2 Equipment Maintenance Record OTSC-OCBC-EM-R006 (A/0)