The outer coil reactor, with its efficient heat transfer performance and precise temperature control capability, has become a core equipment in the fields of chemical production, drug synthesis, and new material research and development. The following is a systematic explanation of its standardized usage process, covering three stages: pre operation preparation, operation management, and final maintenance.
1、 Preparation before operation
1. Equipment inspection
-Confirm that there are no signs of deformation, corrosion, or leakage in the reactor body, outer coil, jacket, and accessory pipelines, and focus on checking the integrity of the flange sealing gasket.
-Verify that pressure gauges, temperature sensors, safety valves, and other instruments are within their calibration validity period, and that explosion-proof membranes are intact and undamaged.
-Trial run the mixing motor and reducer to ensure smooth operation without any abnormal noise, and no dripping or leakage at the mechanical seal.
2. Process parameter verification
-According to the production order, specify the target temperature, pressure, speed, and reaction time, and preset the flow rate of the external coil heating/cooling medium.
-If high-risk media (such as flammable and explosive materials) are involved, it is necessary to replace the air inside the kettle in advance and fill it with inert gas to a slightly positive pressure state.
3. Material addition
-Weigh the raw materials according to the formula, sieve the solid materials to remove impurities, and slowly inject the liquid materials through a metering pump.
-If pre mixing is required, start low-speed stirring to preliminarily mix the materials and avoid side reactions caused by local overheating.
2、 Operation management
1. Heating/cooling control
-Open the inlet and outlet valves of the outer coil, connect thermal oil or steam for gradual heating, and initially climb at a rate of ≤ 5 ℃/min to prevent equipment thermal stress damage caused by excessive temperature difference.
-After reaching the target temperature, switch to automatic temperature control mode, maintain fluctuations within ± 1 ℃ through the PLC system, and monitor the wall temperature distribution in real time.
2. Reaction process monitoring
-Maintain the set speed for continuous stirring, regularly sample and analyze the pH value, concentration, and intermediate content, and adjust the feeding rate or dosage in a timely manner.
-Record temperature, pressure, and speed data every 15 minutes, draw a reaction process curve, and immediately investigate the cause of any abnormal deviations.
3. Emergency response
-In case of sudden overheating (>80% design pressure), quickly cut off the heat source and activate the emergency cooling system, while opening the vent valve to release pressure.
-When there is a power outage, the feed valve should be manually closed, and the backup power supply should be used to drive the mixing and anti sedimentation. If necessary, a terminating agent should be injected to stop the reaction.
3、 Closing and maintenance
1. Unloading operation
-After the reaction is complete, first reduce the pressure inside the kettle to atmospheric pressure, then slowly open the discharge valve and cooperate with nitrogen purging to ensure that the material is completely discharged.
-Viscous materials can be vacuum suctioned or pressurized to prevent residue from blocking the discharge port.
2. Cleaning and maintenance
-After emptying, inject clean water and boil for cleaning. Soak stubborn residues in a special solvent and scrub. It is strictly prohibited to damage the inner wall anti-corrosion layer with a metal scraper.
-Dismantle the inlet filter of the outer coil tube to remove impurities, inspect the corrosion of the pipeline welds, and replace the sealing ring monthly.
3. Shutdown and sealing
-After cleaning, drain the accumulated water and apply rust proof grease to the surface of the mixing shaft. Close all valves and hang a "cleaned" sign.
-When not in use for a long time, fill it with dry air to prevent moisture, and regularly power it on to prevent rust and corrosion.
4、 Key precautions
It is strictly prohibited to operate under excessive temperature and pressure, and the working temperature must not exceed the allowable upper limit of the material;
When using strong acid/alkali media, corrosion-resistant material lining should be selected;
After each maintenance, a water pressure test (1.5 times the working pressure) must be conducted before it can be put into use.
By strictly following the above process, the high heat transfer efficiency advantage of the outer coil reactor can be fully utilized, ensuring the safety and controllability of the production process, and significantly improving product quality and equipment service life.