气焊、气割所用可燃气,一般均为乙炔。我们利用沼气代替乙炔,对钢材焊接和切割进行了反复实验,获得较园满的成功。工艺过程如下: 所用助燃气,仍为压缩的二级纯度的氧气;所用可燃气,为水压式沼气池所产沼气,其体积百分组成为甲烷65％,二氧化碳30％,硫化氢、一化氧碳、氨和氮等5％。这种混和气的燃烧温度,稍低于氧炔焰。为了提高火焰的温度,我们串连了一个0.5m~3容积的石灰水洗气罐,对混合气进行了富集 Gas welding, gas cutting gas used, are generally acetylene. We use biogas instead of acetylene, steel welding and cutting repeated experiments, more successful garden. The technological process is as follows: the used gas is still compressed second-grade oxygen; the combustible gas used is biogas produced by the hydraulic biogas digester, the volume percentage of which is 65% of methane, 30% of carbon dioxide, hydrogen sulfide, Oxygen Carbon, ammonia and nitrogen 5%. This mixed gas has a slightly lower combustion temperature than the oxy-acetylene flame. In order to increase the temperature of the flame, we connected a 0.5m ~ 3 volume of lime-washed gas tank, the enrichment of the mixture