After pressurisation, it returns to the heat exchanger to recover the cold volume of liquid air separation plants and liquefy it into liquid nitrogen, part of which is warmed up to about 123°C by the heat exchanger through the eighth pipeline after a history of throttling, and is pumped out to the medium pressure circulation nitrogen press. Another part of the liquid nitrogen enters the first gas-liquid separator via the fifth pipe. Part of the separated liquid nitrogen goes through the second pipe to the liquefier to liquefy the air and evaporate itself into nitrogen. Another part of the liquid nitrogen goes to the second gas-liquid separator via the sixth pipe and the liquid is sent out as product via the liquid nitrogen output pipe. The gas is reheated out of the cold box floor via the ninth pipe via the heat exchanger. The liquid air separation plant is reheated in the high temperature heat exchanger and a portion is withdrawn from the middle and goes to the heat exchanger via the liquid air separation plant branch pipe to cool the aqueous glycol solution. The other part is pumped through the liquid air separation plant pipeline, from the end of the high pressure heat exchanger and merged with the liquid air separation plant branch pipeline to finally obtain a natural hot gas above 2°C.
Dear Air designs efficient liquid air nitrogen separation plants.
