Process Principle
Oxygen is extracted from the lower part of the upper tower and reheated in the main heat exchanger before exiting the cold box and being pressurized by an oxygen compressor before being sent to the user. The polluted nitrogen gas is drawn out from the upper part of the upper tower and reheated in the subcooler and main heat exchanger before being sent out of the fractionation tower. Part of it is used as regeneration gas for the molecular sieve adsorber, and the excess polluted nitrogen gas is fed into the cooling tower as a cooling source for circulating water. Nitrogen is drawn out from the top of the upper tower, and after reheating in the subcooler and main heat exchanger, a portion of it is sent out as product nitrogen. The remaining nitrogen enters the water cooling tower as a cold source to cool the circulating water. The product liquid oxygen and liquid nitrogen are sent to the storage tank.
Deep cryogenic air separation system
Air compression system: self-cleaning air filter, air compressor, air compressor cooler, oil station, vent muffler, etc.
Pre cooling system: air cooling tower, water cooling tower, chilled water pump, cooling water pump, water filter, ice machine.
Purification system: molecular sieve adsorber, electric heater, vent muffler, switching valve, etc.
Fractionation tower system: expander, main heat exchanger, condenser evaporator, subcooler, upper tower, lower tower.
Product gas compression system: oxygen compressor, nitrogen compressor.
Liquid storage gasification system: oxygen and nitrogen liquid storage tanks, liquid pumps, vaporizers, etc.