Cryogenic distillation
The cryogenic distillation method is to first cool the air to liquefaction and then selectively distill the components at different boiling temperatures. This process can produce high-purity gas with high energy consumption. The cryogenic separation process requires the heat exchanger and separation tower to be closely integrated to obtain good efficiency, and all refrigeration energy is provided by the air compressor at the inlet of the device.
In order to achieve lower distillation temperatures, the air separation equipment needs to use a throttling device to obtain refrigeration capacity, that is, isothermal throttling effect (Linde liquefaction cycle), or use an expander to obtain a large isentropic expansion refrigeration capacity (Kraut liquefaction cycle) to liquefy the air, and the cold equipment must be kept in an insulated shell (commonly called a "cold box").
Components of air separation unit
The compressed air from the air compressor is precooled and purified by the air precooling system, and the molecular sieve removes impurities such as moisture, carbon dioxide, and hydrocarbons. Part of the air is directly sent to the upper tower of the distillation tower, and the other part enters the expander for expansion and refrigeration, and is sent to the lower tower. In the distillation tower, after the rising steam and the falling liquid exchange heat, high-purity nitrogen can be obtained at the top of the upper tower, and high-purity oxygen can be obtained at the bottom of the upper tower.
Compression system
Air compression system includes air inlet filter, air compressor, air compressor interstage cooler, air compressor vent silencer, etc.
Precooling system
Air precooling system includes water cooling tower, air cooling tower, water pump, refrigerator, etc.
Purification system
Molecular sieve purification system includes molecular sieve adsorber, nitrogen vent silencer, etc.
Heat exchange system
Air separation heat exchange system includes main heat exchanger, subcooler, etc.
Distillation system
Air separation distillation system includes distillation tower, condenser evaporator, etc.
Product delivery system
Product delivery system includes pressure regulating station, metering station, etc.
Liquid storage backup system
Backup system includes liquid storage tank, gas storage tank, liquid evaporator, etc.
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