目前,国内不少工矿企业对有色金属制品的气割和焊接正在推广使用液化石油气代替乙炔。大家知道,液化石油气的主要优点是安全性较好,它的组分与空气混合的爆炸极限范围比较窄,如丙烷为2.17～9.5%,丁烷为1.15～8.4%,丙烯为2～11.1%,丁烯为1.7～9,6%,比起乙炔来要安全得多(乙炔与? At present, many domestic industrial and mining enterprises of gas cutting and welding non-ferrous metal products are promoting the use of liquefied petroleum gas instead of acetylene. As we all know, the main advantage of liquefied petroleum gas is that it has good safety. The explosive limits of its components mixed with air are relatively narrow, ranging from 2.17 to 9.5% for propane, 1.15 to 8.4% for butane and 2 to 11.1 for propylene %, Butene is 1.7 ~ 9,6%, much safer than acetylene (acetylene and?