Why is the pressure in the lower tower of the air separation equipment higher than that in the upper tower?

How does contaminated nitrogen gas cool the water cooling tower?

Liquid air separation plant cold energy utilises air separation equipment, generally large air separation equipment with 2 combined expanders. The price is around 4 million RMB. The expansion air in the air separation plant is no longer required, so for the internal compression process air separation, the inlet air volume of the circulating booster is reduced by about 40% (from 5.A-2A). The energy consumption of the booster is reduced and the investment is reduced. Liquid air separation equipmen...