Answer: After removing the micro metal particles and dust impurities in the air through the air filter, the air enters the svk20-3s type turbine air compressor for 1-3 level compression and cooling to obtain 0. 5MPa under normal temperature pressure gas. When the follow-up equipment is not started, the compressed air will be completely emptied after passing through the last stage anti-surge valve of the air compressor. After the follow-up equipment starts normally, the pressured gas enters into the precooling system to exchange heat with the cooling water and chilled water from the cooling water pump and the chilled water pump. After the gas temperature reaches the technological requirements, enter the molecular sieve purifier to remove acetylene, carbon dioxide and water vapor in the air to obtain dry and clean processing air. Air outflow molecular sieve rear dividing road into follow-up equipment. One way to return to the air filter through the v- 1216 valve as the back blowing gas; one way as the sealing gas; one way as the heating gas of the expansion machine through the v- 1216 valve (when the expansion machine is not heated, this way should be closed); one way into the main heat exchanger, after heat transfer, it directly enters the bottom of the tower. Under normal working condition, the liquid air gathers in the evaporator, and the steam rises along the tower plate, which is used as the rising steam of the tower to participate in the rectification; the other way enters the supercharger, adjust the air pressure from 0. 5 MPa pressurization to 0. SMPa enters the main heat exchanger, coordinates the front temperature of the expansion machine through the V-l middle pumping and V-2 bottom pumping, then enters the turbine expansion machine, and expands the pressure of processed air to 0. 04 a 0. 05MPa, enter into the middle of the upper tower as the rising steam, and participate in the rectification of the upper tower. Gathering in the liquid air in the evaporator at the bottom of the lower tower, a part of which is further condensed by the cooler and then through the liquid air regulating valve LCV-1, enters into the upper section of the upper tower as the recirculation liquid; part of the evaporator liquid level regulating valve LCV-02 enters the evaporator of crude argon II as the cold source. After the condensation again, the evaporator returns to the middle of the upper tower through the outlet valve of the V-701 air as the recirculation fluid, participation in the tower distillation.
The liquid nitrogen on the top of the lower tower enters the top of the upper tower as the reflux fluid through the HV-l liquid nitrogen regulating valve after further condensation through the cooler; after the other one passes through the cooler, in front of the HV-1 valve, through the liquid nitrogen liquid level regulating valve, LCv-704 into the condensing evaporator of the pure argon Tower as the cold source. After evaporating, the pressure control valve PCv-704 of the oil hair machine which condenses through nitrogen returns to combine with the dirty nitrogen extracted from the upper tower and discharge it out of the tower for other purposes; then return to the lower tower through the liquid nitrogen return valve V-5 as the reflux fluid of the lower tower to participate in the rectification of the lower tower; gather the nitrogen on the top of the lower tower and directly enter the evaporator at the bottom of the pure helium tower, it is condensed into liquid because of the nitrogen component in the evaporated liquid argon, and then HV-701 through the liquid nitrogen evaporator regulating valve, and combine with the liquid nitrogen pipeline of the lower tower as the reflux liquid of the upper tower.
