Is it necessary to install a check valve at the nitrogen gas outlet of the distillation column in cryogenic air separation?
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1. The company’s cryogenic air separation unit produces only gaseous nitrogen (4,000 cubic meters) and liquid nitrogen; it does not produce oxygen or any other products. 2. From behind the check valve at the air compressor outlet to the nitrogen buffer tank, no check valves are installed in this section of the pipeline. 3. There is a manual vent pipe after the check valve at the compressor outlet. 4. The air compressor stops operating and does not participate in other interlocks of the plant. 5. The volume of the nitrogen gas buffer tank is 50 cubic meters; the volume of the distillation tower has not been determined: L. May I ask: if the air compressor is vented or shuts down for some reason, will the pressure in the fractionation tower be affected in the short term, which in turn could affect the pressure in the nitrogen gas buffer tank? So, is it necessary to install this check valve? Purpose: To maintain stable pressure in the air-nitrogen buffer tank and nitrogen piping network.
It’s necessary~~ Isn’t it included in the design? The nitrogen gas outlet usually consists of a control valve, a manual ball valve, and a check valve~~Please look again; it should be there~~
We install a check valve here as well as a control valve
Just send over your flowchart, and everyone can give you some suggestions to improve your current process.
It is generally not necessary. I’ve never seen anything like it. Under normal circumstances, there is no negative pressure in the tower. It’s all positive pressure; the main cooler is constantly evaporating to maintain the pressure in the upper tower, and there’s just a control valve at the outlet.