This cryogenic ASU oxygen and nitrogen plant is equipped with the function of a main heat exchanger, enabling counter-flow heat exchange among multiple fluid streams. It cools the forward-flowing air to a temperature close to the liquefaction temperature while reheating the backflow products, oxygen and nitrogen, to the ambient temperature, reducing cold loss

This cryogenic ASU oxygen and nitrogen plant is equipped with a two-stage structure for the distillation column. The lower column operates under higher pressure, initially separating air into oxygen-rich liquid air and pure liquid nitrogen.