煤层气,又称作煤层甲烷,俗称煤田瓦斯,是产生于煤层而又储集在煤层中的一种可燃性气体,其甲烷成份占90％以上,热值与天然气相当,是城市煤气的两倍,是氢气的三倍。长期以来,在煤矿生产过程中,多数作为有害气体排放到大气中,仅有少量抽取利用。自美国八十年代成功地解决了地面 Coalbed methane, also known as seam methane, commonly known as coal gas, is a flammable gas produced in the coal seam and stored in the coal seam. Its methane content accounts for more than 90% of the calorific value of natural gas, Times, three times that of hydrogen. For a long time, in the process of coal mine production, most of them are released into the atmosphere as harmful gases, and only a small amount of them is used for extraction. Since the United States in the eighties successfully resolved the ground