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.

第二階段：2000年-2004年，發明電控燃氣混合器，開發400kw、500kw、1200kw、2000kw煤礦瓦斯發電機組，這種發電機組適合于瓦斯濃度大于30%的煤礦。

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%.

第三階段：2004年下半年到現在，相繼開發了低濃度瓦斯安全輸送技術、機組安全防爆技術、低濃度發電技術等相關專項技術，并成功應用于煤礦低濃度瓦斯(4%-30%)發電領域。

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、利用低濃度瓦斯進行發電必須解決的問題

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

首先是安全性問題，包括氣體輸送安全與機組安全，輸送安全是低濃度瓦斯發電的首要前提;機組安全則是低濃度瓦斯發電的重要保障。

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.

其次是適應性問題，必須要保證機組能夠適應瓦斯濃度不斷變化的特點，才能進行穩定、的發電。

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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