As a high-risk chemical equipment, the maintenance quality of hydrogenation reaction kettle is directly related to production safety and equipment life. Scientific maintenance and upkeep need to run through the entire chain of "daily protection, periodic maintenance, and special strengthening". The following are the key implementation points:

1、 Daily maintenance and inspection

Implement the "three checks" system before starting up every day: check whether the sealing surface is intact, check the opening and closing status of each valve, and check the zeroing status of the pressure gauge. Pay close attention to whether there are any signs of medium leakage at the flange connection of the kettle body, especially in a hydrogen environment where small leaks may cause danger. When feeding, the principle of "slow pressure" should be followed to avoid instantaneous high-pressure impact on the sealing components. After the reaction is complete, promptly evacuate the residual gas and replace it with inert gas at least three times to prevent hydrogen gas from remaining and causing safety hazards. Clean the hanging material on the inner wall after each use to avoid scaling that affects heat transfer efficiency and mixing smoothness. ​

2、 Special maintenance of key components

1. Sealing system: O-rings are mandatory to be replaced every quarter, and hydrogen resistant fluororubber material is selected. Tighten the clamp bolts in diagonal order, with torque controlled within the range specified in the equipment manual. Scratches on the metal sealing surface need to be repaired by sanding with sandpaper to ensure that the flatness of the contact surface meets the standard. ​

2. Mixing system: Disassemble the mechanical seal components monthly and remove metal debris from the magnetic coupling sleeve. When the wear of the stirring blade exceeds 20% of its original thickness, it must be replaced, and dynamic balance correction should be completed on specialized equipment. The bearing lubrication uses high-temperature silicone grease, which is replenished every six months. ​

3. Pressure system: The safety valve is sent for annual calibration to check the popping pressure, and the bursting disc is forcibly replaced according to the design life. The pressure sensor undergoes zero calibration every quarter and its linearity is verified using standard weights. ​

4. Temperature control unit: The jacket thermal oil should be replaced annually, and the oil circuit should be cleaned before replacement. The insulation resistance of the electric heating rod should be ≥ 2M Ω. If any abnormal temperature rise is found, the power should be immediately cut off for maintenance. ​

3、 Periodic comprehensive maintenance

Establish a system: Remove the kettle cover for comprehensive non-destructive testing, with a focus on inspecting the corrosion and thinning of welds. Sandblasting and rust removal shall be carried out on the inner wall of the kettle, and then the anti-corrosion layer shall be re sprayed. All fasteners shall undergo torque retesting, and loose parts shall be replaced with anti loosening gaskets. Conduct full chain signal testing on the control system, simulate over temperature and over pressure conditions to verify the effectiveness of interlock protection. Dust removal of the electrical cabinet and detection of the aging degree of the circuit, all wiring terminals are re tightened. ​

4、 Special working condition response strategy

For strong exothermic reactions, dual temperature measurement devices need to be installed as backups for each other. When handling materials containing solid particles, install a filter screen at the feed inlet to prevent blockage. In case of sudden water and power outages or other emergency situations, the emergency cooling system should be immediately activated and nitrogen should be filled into the kettle to maintain pressure. During the long-term shutdown period, turn the wheel at least once a week to prevent the shaft seal from sticking, and turn on the power for dehumidification every month to prevent electrical appliances from getting damp. ​

5、 Digital management improvement

Establish an electronic record of the equipment, recording the batch number of the parts replaced during each maintenance. Use a vibration analyzer to monitor the operation status of the mixing system, and use an infrared thermal imaging device to detect defects in the insulation layer. Set warning thresholds for key parameters, such as automatically triggering an alarm when the temperature mutation rate exceeds 5 ℃/min. ​

The correct maintenance system can reduce the failure rate of hydrogenation reactors by more than 60% and extend the service life of equipment to 1.5 times the design life. It is necessary to strictly implement the "Rules for Periodic Inspection of Pressure Vessels" and entrust qualified units to conduct annual comprehensive inspections. Operators must undergo specialized training and pass the assessment, master emergency response skills, in order to achieve safe and long-term operation of equipment.