At present, China's metal gas cutting process is commonly used in the traditional method of oxygen-acetylene cutting with a history of 100 years. Acetylene has heavy pollution, high energy consumption, high cost, poor cutting quality, explosive and flammable, which endangers the health and safety of workers. Substituting acetylene has already become the consensus of the industry.

Since the reform and opening up, especially since the 1990s, relevant government departments have taken measures to promote the replacement of acetylene and avoid pollution. In 1992, the State Science and Technology Commission issued a document to promote oxygen-liquefied petroleum gas technology; in 1995, the competent department of machinery industry issued a decision not to review the establishment of new renovation and expansion of calcium carbide plant and acetylene gas plant; in September 1996, the State Economic Commission and the State Planning Commission The State Science and Technology Commission and other departments jointly listed the oxygen-propane gas technology as a national key promotion project during the “Ninth Five-Year Plan” period; in 1998, the State Economic and Trade Commission issued the No. 6 Order, which will produce an acetylene gas plant with an annual output of less than 10,000 tons and an open type. Calcium carbide furnaces were eliminated as backward production processes. In 1998, the National Science and Technology Commission Achievements Office and China Welding Association jointly held a gasoline cutting machine application promotion meeting, and listed the synergistic propane gas “Kaiteng” gas imported from abroad as the first batch of key promotion projects, etc. After years of hard work, the popularization and promotion of new industrial gas in China has made important achievements.

China is a developing industrial power and a big country in acetylene consumption. In recent years, although new technologies in the field of metal welding have made continuous progress, there is still a considerable gap between the replacement of acetylene gas and the popularization and promotion of new industrial gas in developed countries. Since the 1970s, some developed countries in the world have begun to replace acetylene gas with new industrial gas of alkylene olefins. In the mid-1980s, the use rate of new industrial gas in developed countries such as the United States, Britain and Japan has reached 50-70. In the 1990s, the United States reached 85%. By contrast, the popularity of new industrial gas in China has fallen behind the United States for nearly 30 years. Therefore, starting from the actual situation in China, replacing acetylene gas with new industrial gas technology, developing and promoting gas-cutting processing methods of safety, environmental protection, high efficiency and energy saving, wide fuel supply, stable application technology and easy operation and use, it is imperative to eliminate acetylene pollution. .

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