The air separation unit is a large complex system, which is mainly composed of the following subsystems: power system, purification system, refrigeration system, heat exchange system, distillation system, product delivery system, liquid storage system and control system.
Power system: mainly refers to raw material air compressor.
Air separation equipment can separate air, oxygen, nitrogen and other products at low temperature, basically through energy conversion. The energy of the equipment is mainly input by the original air compressor. Therefore, the total energy consumption of air separation is mainly the energy consumption of the original air compressor.
Purification system: composed of air precooling system (air cooling system) and molecular sieve purification system (purification system). The compressed raw air is very hot. Air precooling system reduces air temperature by contact heat transfer and washes away harmful impurities, such as acid. The molecular sieve purification system further removes water, carbon dioxide, acetylene, propylene, propane and nitrous oxide from the air, which is harmful to the operation of air separation equipment.
Refrigeration system: expansion refrigeration is adopted in air separation unit. The refrigeration of the whole air separation equipment strictly follows the classical refrigeration cycle. And commonly known as air separation refrigeration equipment, only refers to the expansion.
Heat exchange system: the heat balance of air separation equipment is realized by refrigeration system and heat exchange system. With the development of technology, the current heat exchanger mainly uses aluminum plate heat exchanger.
Distillation system: the core of air separation plant, is an important equipment for low temperature separation. Two stage distillation of high pressure and low pressure is usually used. It includes low pressure tower, medium pressure tower and condensing evaporator.
Product delivery system: the oxygen and nitrogen produced by the air separation unit need a certain pressure to meet the use of the follow-up system. It is composed of oxygen compressor and nitrogen compressor of various specifications.
Liquid storage system: air separation equipment can produce some liquid oxygen, liquid nitrogen and other products into liquid storage system for use when needed. It can be composed of different types of tanks, cryogenic liquid pumps, evaporators, etc.
Control system: computer distributed control system is adopted in large air separation plant, which can realize automatic control.
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