After years of economic development, China's GDP has reached the second in the world. With the growth of GDP, the energy consumption of our country is increasing day by day. In addition to increasing the production cost, it also brings a lot of industrial waste, causing environmental pollution. Therefore, all walks of life must improve the existing equipment, energy conservation and emission reduction, and protect the environment. Air separation plant is widely used in petrochemical, glass, rubber, construction, carbon fiber and other industries, and it is a major energy consumer. Most of the energy consumed in the whole process of air separation is consumed by air compressor of air separation plant. If it can reduce the discharge pressure of air compressor of air separation plant, it can reduce the energy consumption and protect the environment.