With the increasing demand for large-scale air separation plant in China's metallurgical, petrochemical, coal chemical industry and other industries for more than ten years, the specifications of air separation plant are developing towards the direction of large-scale and super large-scale. Large gas air separation plant has become a good choice for many enterprises to expand their application and expand market. DEAR air separation has been actively developing and producing supporting large gas air separation plant, and has established deep cooperation with many enterprises, with good equipment operation and stable working conditions.