With the development of petrochemical industry, liquefied petroleum gas, as a basic chemical raw material and a new fuel, has attracted more and more attention. In chemical production, liquefied petroleum gas is a by-product of catalytic cracking and thermal cracking of crude oil in refineries. Main components of FCC gas (%): hydrogen 5 ~ 6, methane 10, ethane 3 ~ 5, ethylene 3, propane 16 ~ 20, propylene 6 ~1,butane 42 ~ 46, butene 5 ~ 6. , used to produce synthetic plastics, synthetic rubber, synthetic fibers and medical supplies, explosives, dyes and other products. Liquefied petroleum gas as fuel has been widely used in people's lives because of its high calorific value, smokeless, carbon residue-free and convenient operation and use. In addition, liquefied petroleum gas is also used for cutting metals, baking agricultural products and ovens in the industrial and aerospace industries.