Clean room workshop refrigeration system operation and debugging

Clean room workshop refrigeration system operation and debugging

Before the test run of the clean clean room modular compressor, remove the cylinder head, suction and exhaust valve and crankcase cover and check the cleanliness and fixation inside the compressor. There should be a small amount of refrigerating oil on the inner wall of the cylinder, and the cylinder head and other components should be installed , and then turn the compressor several times, each moving part should rotate flexibly,...

Text label: clean room refrigeration system, operation and debugging, purification plant system

Operation and debugging of refrigeration system of clean room workshop

Before the test run of the clean clean room modular compressor, remove the cylinder head, suction and exhaust valve and crankcase cover and check the cleanliness and fixation inside the compressor. There should be a small amount of refrigerating oil on the inner wall of the cylinder, and the cylinder head and other components should be installed , and then turn the compressor several times, all moving parts should rotate flexibly, without over-tightening and jamming; the safety valve should be verified and set, and its action should be sensitive and reliable, and the setting values u200bu200bof the relays such as pressure, temperature, and differential pressure should be It shall comply with the provisions of the equipment technical documents; the power supply system, safety protection control system, automatic adjustment system and no-load test run of the motor shall be completed. The refrigeration system uses 0.5-0.6MPa nitrogen or dry air to blow the dirt repeatedly in sequence. If the air pressure of the no-load test is used to blow the dirt, the pressure of the compressor should be raised to 0.5-0.6MPa, and the air pressure should be raised to the required pressure. After the value is reached, open the valves leading to the atmosphere at the bottom of each equipment in the refrigeration piping system in turn to make the air flow out sharply. During the blowing process, steel chips and impurities in the system are easy to adhere to the valve sealing ring and valve disc, and the sealing surface is easily crushed and leaking when the valve is closed. Therefore, the valve should be thoroughly cleaned and reassembled after the system is blowing.

After the installation of the refrigeration equipment and piping system, the air tightness test of the system must be carried out to check whether there is leakage in the system; in the refrigeration system with multiple refrigeration compressors, if the unit is used for pressure test, it should be Designate one of them to be used. After the pressure test, it must be disassembled and cleaned, and the water in the compressor must be wiped dry. In order to prevent the compressor safety valve from being opened, the difference between high and low pressure should not exceed 1.6MPa; The vacuum pump or compressor draws out the air in the system, the residual pressure after pumping out is not less than 5.33KPa, keep it for 24H, and the system boost does not exceed 0.667KPa, it is qualified; the vacuum test is to check whether there is any leakage in the system under vacuum state, and discharge it out. The residual air and moisture in the system and create conditions for the system to fill the tank with refrigerant, the vacuum test should be carried out on the basis of passing the air tightness test. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean rooms and purification plants.

Before the load test operation of the refrigeration system in the clean clean room modular, the setting values u200bu200bof safety protection, differential pressure relay and pressure relay should be checked to check whether the oil level of the oil tank meets the requirements; open and close the corresponding valve in the system, and open the direct evaporative type The air supply fan of the surface cooler system, adjust the energy adjustment device to the position of the minimum load; after the compressor is started, check the oil pressure, suction and exhaust pressure immediately, and monitor whether the sound of the machine is running normally, such as the suction pressure drops to 0.1MPa In the following, the suction valve should be gradually opened to make the compressor enter the normal operation state. According to the operation of the refrigeration system, the opening of the liquid supply valve, expansion valve and oil return valve should be further adjusted to make the oil pressure, suction pressure and discharge pressure. Meet the requirements of the equipment technical documents; the compressor with automatic operation device should be turned to the automatic position after the manual test operation is qualified, so that the compressor can automatically start and run. It is 8-24H; during the trial operation, the cooling water volume of the condenser can be adjusted, check whether the high pressure setting value of the pressure relay is set correctly, adjust the suction pressure of the compressor, and check whether the low pressure setting value of the pressure relay is correct, otherwise Further adjustments should be made; after checking that everything is normal during the compressor load operation, the compressor should be stopped first, and then the fan, water pump, and condensate water and chilled water systems should be stopped; , the liquid outlet valve should be closed first, and the refrigerant should be recovered into the liquid receiver. After the compressor stops running, the suction and exhaust valves should be closed to drain the accumulated water in the condenser, evaporator, cylinder liner, etc. .

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