The first stage: in 1995, Jincheng entered the field of coal mine gas power generation for the first time, but at that time, the natural gas engine technology was mainly applied. This kind of generator set is only suitable for the initial stage of coalbed methane development, with high gas concentration and little change.

第二阶段：2000年-2004年，发明电控燃气混合器，开发400kw、500kw、1200kw、2000kw煤矿瓦斯发电机组，这种发电机组适合于瓦斯浓度大于30%的煤矿。

The second stage: from 2000 to 2004, invented electronic control gas mixer and developed 400KW, 500kW, 1200kW and 2000kW coal mine gas generator sets, which are suitable for coal mines with gas concentration more than 30%.

第三阶段：2004年下半年到现在，相继开发了低浓度瓦斯安全输送技术、机组安全防爆技术、低浓度发电技术等相关专项技术，并成功应用于煤矿低浓度瓦斯(4%-30%)发电领域。

The third stage: from the second half of 2004 to now, we have successively developed low concentration gas safety transmission technology, unit safety explosion-proof technology, low concentration power generation technology and other related special technologies, and successfully applied in the field of coal mine low concentration gas (4% - 30%) power generation.

二、利用低浓度瓦斯进行发电必须解决的问题

2、 Problems to be solved in power generation with low concentration gas

首先是安全性问题，包括气体输送安全与机组安全，输送安全是低浓度瓦斯发电的首要前提;机组安全则是低浓度瓦斯发电的重要保障。

The first is safety, including gas transmission safety and unit safety. Transmission safety is the primary premise of low concentration gas power generation; unit safety is an important guarantee of low concentration gas power generation.

其次是适应性问题，必须要保证机组能够适应瓦斯浓度不断变化的特点，才能进行稳定、的发电。

The second is the adaptability. It is necessary to ensure that the unit can adapt to the changing gas concentration in order to achieve stable and efficient power generation.

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