Brief description of the process of cryogenic air separation equipment
The raw air is compressed to 0.78Mpa (gauge pressure, the same below) by a compressor, and then passes through a pre cooling unit and a water separator to reduce the dew point of the raw air to く 10 ° C, and the moisture is separated in the water separator.

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.

The pressure swing adsorption oxygen production device uses clean compressed air as raw material, zeolite molecular sieve as adsorbent, and utilizes the principle of pressure swing adsorption to obtain oxygen at room temperature. Based on the differences in the adsorption amount of oxygen and nitrogen on the surface of zeolite molecular sieves in the air, as well as the different diffusion rates of oxygen and nitrogen in zeolite molecular sieves, a programmable controller is used to control the opening and closing of the pneumatic valve to achieve the process of pressurized adsorption and depressurized desorption, completing the separation of oxygen and nitrogen and obtaining the required purity of oxygen.

The industrial nitrogen generator adopts the PSA pressure swing adsorption principle. Under a certain pressure, due to the dynamic principle, the diffusion rates of nitrogen and oxygen molecules on the micropores of carbon molecular sieve surface are different. The smaller diameter oxygen molecules diffuse faster and more enter the solid phase of the molecular sieve, while the larger diameter nitrogen molecules diffuse slower and enter the solid phase of the molecular sieve less. The enriched

Using a carbon deoxidizer to burn residual oxygen in the feed gas at a certain temperature, the combustion reaction generates trace amounts of nitrogen dioxide and water in high-purity nitrogen, which are then removed using heating adsorption drying and double tower adsorption processes to obtain high-purity product gas with a purity of 99.999% to 99.9999%. After filtration, clean nitrogen gas is obtained (combustion deoxidization+adsorption drying).

According to the principle of freeze dehumidification, compressed air first undergoes preliminary heat exchange and cooling with already dried low-temperature compressed air in a heat exchanger, and then further cools down through an evaporator, causing gaseous water and oil in the compressed air to condense into liquid form through isobaric cooling and be discharged from the system, thereby obtaining clean and dry compressed air.

According to the principle of freeze dehumidification, compressed air first undergoes preliminary heat exchange and cooling with already dried low-temperature compressed air in a heat exchanger, and then further cools down through an evaporator, causing gaseous water and oil in the compressed air to condense into liquid form through isobaric cooling and be discharged from the system, thereby obtaining clean and dry compressed air.

According to the principle of freeze dehumidification, compressed air first undergoes preliminary heat exchange and cooling with already dried low-temperature compressed air in a heat exchanger, and then further cools down through an evaporator, causing gaseous water and oil in the compressed air to condense into liquid form through isobaric cooling and be discharged from the system, thereby obtaining clean and dry compressed air.

According to the principle of freeze dehumidification, compressed air first undergoes preliminary heat exchange and cooling with already dried low-temperature compressed air in a heat exchanger, and then further cools down through an evaporator, causing gaseous water and oil in the compressed air to condense into liquid form through isobaric cooling and be discharged from the system, thereby obtaining clean and dry compressed air.