Compressed air is an important energy medium, which runs through the whole process of steel production. In iron and steel enterprises, compressed air accounts for a large proportion of all energy consumption (about 5% - 15% of the total energy consumption). The use of compressed air in steel companies is included in all production processes. Its main uses can be divided into: sintering pneumatic conveying, blast furnace injection, continuous casting steam spray cooling, converter bottom blowing, steel belt surface blowing, various pneumatic instrument valves, air motor, pulse bag filter and so on.