Question: CO2 liquefier design
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This post was last edited by yangfh on 2019-11-19 at 14:53. Hello everyone! I have a question for everyone: There is a CO2 liquefier in which the mole fraction of CO2 is 95.1%, air accounts for 4.5%, and propylene oxide makes up 0.4%. The liquefier uses a U-tube structure, with the gas flowing through the tube side – the gas enters from the inlet at the upper part of the tube side and exits from the outlet at the lower part. The inlet pressure is 2.3 MPaG, and the gas flow velocity inside the tube is approximately 0.7 m/s. I would like to ask whether, since there are non-condensable gases inside the heat exchange tubes, it is necessary to remove them separately? What is the basis?
The gas is emitted periodically and intermittently. What evidence do you want! I am the basis!
Doesn’t the gas inside the heat exchange tube flow? Why emit it separately? Will the non-condensable gases flow out of the heat exchanger along with the new CO2?
This post was last edited by wiseboy on 2019-11-20 10:01. You are right. The gas inside the heat exchange tube is in motion, but it depends on the type of end cap you use. If it is an oval head, an exhaust port can be provided on the head to prevent the accumulation of non-condensable gases. Of course, it may not be necessary to discharge frequently, but it is possible to leave an exhaust port as a backup. If it is a U-tube, it is not necessary.