Another part of the nitrogen vaporized in the liquefier is heated up to a certain temperature in the high pressure heat exchanger and pumped out to the low pressure nitrogen press, the nitrogen separated by the gas-liquid separator is also heated up by the high pressure heat exchanger and then goes to the low pressure nitrogen press, compressed to a certain pressure by the low pressure nitrogen press and then back to the high pressure heat exchanger for heat exchange with liquid air separation plant, after cooling, it is pumped out to the high pressure nitrogen press, pressurized and then returned to the high pressure heat exchanger for heat exchange and cooling with liquid air separation plant. The liquid nitrogen is then throttled and separated by a gas-liquid separator, part of the liquid nitrogen goes to the liquefier to cool the air, transferring the cold from the liquid air separation plant to the air separation system, and the throttled and gasified nitrogen enters the high-pressure heat exchanger to reheat to the inlet temperature of the low-pressure nitrogen press and enters the low-pressure nitrogen press cycle. A part of the liquid nitrogen is throttled and separated, the liquid nitrogen is sent out as product, the nitrogen is reheated out of the cold box by the high pressure heat exchanger, the liquid air separation plant is gradually warmed up and vaporised in the tube-wound heat exchanger, the low temperature cold is transferred to the nitrogen, but it is not reheated to room temperature, especially for the higher pressure liquid air separation plant whose high temperature cold is not utilised, the high temperature cold can be recovered by suitable refrigerants, glycol aqueous solution, Freon for the air compressor. intercooling and final stage cooling.
Dear Air Separation produces gas-liquid separators to improve the efficiency of air compressor machines and to save energy and reduce consumption of liquid air separation plant.
