CNPC Chai Gas (coal bed methane) power generation products were first used in Jincheng area in 2003. Since 2005, the company has increased r&d investment in coal mine gas power generation products, paid attention to communication and cooperation with relevant research institutes of coal mines, and established close ties with China Coal Bed Methane Society, Henan University of Science and Technology, Fushun Coal Branch General Institute and other coal design institutes. Have research and development of coal mine gas proprietary models 8 kinds of high and low concentrations of power to cover 200-1500 kw, adopting advanced gas machine control technology in the world, and the thin combustion theory, in view of the domestic gas drainage discharge process, the characteristics of the volatile gas concentration, through the reasonable matching of air intake system, makes the gas unit to adapt to the performance of the more broad, can burn methane concentration from 8% to 60%, in the range of 3 to 15 kpa pressure of gas, its performance, fuel economy, safety and reliability have reached the international advanced level.It is distributed in 13 major coal producing areas, and more than 500 sets of gas (CBM) equipment have been sold in Shanxi market alone.