Seeking the operating procedures for the cycle compressor in low-temperature methanol washing process

First, establish oil circulation and check whether the cooling water is functioning properly. The circulating compressor is pressurized; the inlet pressure and system pressure are in balance, all instruments are functioning properly, and power has been supplied. The communication process allows one to drive.

Steps for starting and stopping the circulating gas compressor: (1) Preparations before starting A. Inspect the motor and moving parts to ensure that there are no unnecessary objects around them. B. Check the measuring instrument and turn it on. C. Check that the cooling water pressure is normal; open the inlet and outlet valves for each circuit of cooling water to ensure smooth flow of the cooling water. D. Check the oil level in the tank of the lubrication system; it should be at 2/3 of the capacity. E. Nitrogen displacement is satisfactory. F. Open all drain valves of the compressor, drain the accumulated water, and then close them. G. Start the circulating oil pump and check that the oil pressure is normal. H. Rotate the crankshaft several times to check for any abnormalities such as collisions or jams in the crankshaft, crosshead, connecting rods, and cylinders, and replace the gas inside the cylinders and connection pipes. I. Contact an electrician to test the motor insulation and restore power supply. (2) Driving A. Start the motor and check whether the compressor’s driving components are operating properly, with no abnormal noises. B. Check whether the current, cylinder pressure rise, and temperature rise are normal. C. If the compressor is operating normally, close the compressor outlet vent valve and gradually close the valve connecting the compressor inlet and outlet. D. The outlet pressure is slightly higher than the pressure in the scrubber tower; open the compressor outlet valve to introduce the recycled gas into the scrubber tower. E. Check whether the intake and exhaust pressures of the compressor, as well as the operation of the lubrication system, are normal. (3) Normal shutdown: A. Open the inlet and outlet connection valves of the compressor, and the control room adjusts the compressor inlet pressure to be within the normal operating range. B. Close the gas outlet valve. C. Press the stop button to shut down the motor. D. After stopping the operation, close the gas inlet valve, then shut down the circulating oil pump and the cooling water. (4) Emergency shutdown: The compressor should be stopped immediately in the event of serious failures in the compressor or motor, when a large amount of liquid enters the cylinder, or in cases of explosions, fires, or other serious accidents involving high-pressure equipment and pipelines. Emergency shutdown procedure: A. Press the stop button to shut down the motor. B. Close the gas inlet and outlet valves. C. Open the inlet and outlet connection valve, and open the outlet vent valve to relieve pressure. D. Then proceed with normal shutdown procedures. (5) Compressor reverse operation A. Check and start the backup compressor following the normal startup procedure. B. Once the backup compressor is operating properly, close the vent valve. C. Gradually close the connecting valve to raise the standby compressor to system pressure. D. Open the gas outlet valve of the backup compressor, simultaneously open the inlet and outlet connection valve of the original compressor, and close the outlet valve of the original compressor. E. Press the original compressor shutdown button; for the others, handle them as per normal shutdown procedures.

Preparations before starting up: 1. Clean the equipment and pipelines, and blow out any water residues for washing. 2. Check whether the equipment, instruments, valves, alarms, interlocks, etc. are functioning properly. 3. Conduct a hydrostatic test on the system. 4. Perform an airtightness test on the system (pressurize to detect leaks), to assess the pressure resistance of the equipment and identify any leaks within the system. 5. Carry out individual tests on the moving equipment.

Steps for starting up: 1. Activate the dry gas seal system. 2. Set up the start-up oil system: 1.) Inspect the system; 2.) Start the main oil pump; 3.) Fill the system with oil and remove air from it; 4.) Activate the pressure storage tank; 5.) Activate the high-level oil tank. 3. Activate the impulse type crankshaft rotation device. 4. Establish circulation in the condensate system. 5. Prepare the compressor system: 1.) Adjust and verify the valves in the compressor system; 2.) Displace nitrogen from the cylinder bodies. 6. Introduce propylene into the system. 7. Conduct static tests on the safety protection devices. 8. Warm up the turbines. 9. Activate the shaft seal steam supply. 10. Start the extraction pump. 11. Start the propylene compressor. These are the key steps summarized by me! It’s not a reciprocating compressor; it’s for freezing, haha! For reference only

To supplement the pre-driving checks on the first floor: Should the circuit valves in the compressor’s gas passage also be checked to ensure they are unobstructed? Also, if it is steam-driven, it is necessary to check the integrity of the steam pipes and condensate lines, and raise the temperature gradually in accordance with the pipe warming and machine heating rates. Only then can it be turned on.