In the air separation unit, since the raw air is compressed, the water in the air leaving the air compressor is generally saturated. After leaving the air cooling tower, the water in the air is still saturated. However, after passing the air cooling tower, the air temperature decreases and the water content in the saturated state decreases. Therefore, the air passing through the air cooling tower not only reduces the air temperature, but also reduces the water content in the air and reduces the load of molecular sieve.
Kaifeng DEAR Air Separation Group Design and Research Institute, through continuous research and development, has developed a device for producing low temperature clean air that is applied to YPN-2000 nitrogen external liquefaction equipment. The device removes dust and gas impurities from the air through a dust filter and an air purification mechanism, and regulates them through a turbine expander, a main heat exchanger and a three-way regulating valve to produce high-quality low temperature clean air whose temperature can be adjusted within a certain range, The problem of environmental pollution caused by refrigerant in cascade refrigeration system is solved, and the operation cost and cost are low, and the maintenance and operation are less difficult, which is conducive to mass production of high-quality low-temperature clean air.
