At present, the global resources are increasingly scarce, and the rational development and utilization of coal mine gas is of great significance. First of all, for China, the conventional energy oil is not high, but with the increasing demand of social development, at present, China relies on import more energy. In this situation, it is necessary to develop and utilize new energy such as gas. Secondly, better economic benefit is also an important aspect of mining coal mine gas. The price of oil and natural gas in the energy market is getting higher and higher, and the project cost of coal mine gas development is relatively low. Its construction can be carried out with coal mining project, which can greatly save the mining cost of coal mine gas and improve economic benefits.

世界上早开采瓦斯发电的是美、英、澳大利亚等国，上世界80年代他们主要采用煤矿瓦斯燃气轮机进行发电，早期我国利用煤矿瓦斯进行发电主要采用高浓度瓦斯，由于缺乏瓦斯深度变化的自适应技术及瓦斯气源增压技术，导致这种技术无法进行大面积推广。

In the world, the United States, Britain, Australia and other countries used coal mine gas turbine to generate electricity in the early 1980s. In China, high concentration gas was mainly used in coal mine gas power generation in the early stage. Due to the lack of adaptive technology of gas depth change and gas source pressurization technology, this technology can not be widely promoted.

当前煤矿瓦斯发电主要采用燃气轮机与燃气内燃机两种，前者使用高浓度的瓦斯且要对瓦斯增压大于1Mpa,而燃气内燃机对瓦斯浓度要求比较宽泛，只要在瓦斯爆炸区值内的浓度都是可以使用的，对于这两种发电设备，其技术难点也有所不同。就燃气内燃机来说，技术难点是用储气室对瓦斯进行缓冲与供应，以保证机组接收的是压力值与浓度值都趋于稳定的气体，来保证煤矿瓦斯发电机组正常稳定的工作，这就需要对发动机进行严格的闭环控制，以防止瓦斯浓度出现变化时，对发电机的功率造成影响，以及对发动机产生的爆震对活塞、连杆等的破坏。

At present, gas turbine and gas-fired internal combustion engine are mainly used in coal mine gas power generation. The former uses high concentration gas and needs to pressurize the gas more than 1MPa, while the gas internal combustion engine has wide requirements on gas concentration. As long as the concentration within the gas explosion area value can be used, the technical difficulties of the two power generation equipment are also different. As for gas-fired internal combustion engine, the technical difficulty is to buffer and supply gas with gas storage chamber, so as to ensure that the unit receives the gas with stable pressure and concentration value, so as to ensure the normal and stable operation of coal mine gas generator set. Therefore, strict closed-loop control of the engine is required to prevent the influence on the power of generator when the gas concentration changes, As well as the damage to the piston and connecting rod caused by the knock on the engine.

当前煤矿瓦斯发电所采用的技术概括起来主要有：瓦斯混合技术、自动控制技术和阻燃技术等。瓦斯气体的混合有不同的方式，如等真空度膜片混合、文丘里电控混合器混合以及双蝶门混合器电控混合等，对低压气体的混合可以彩用先增压再混合的方式，一般从矿井抽出来的瓦斯较适宜与空气在增加前进行预混合，混合前不用加压可以较好的提高经济效益。在自动控制方面，通过采用全电子管理系统（TEM）能够实现对信息的收集、显示、通讯存储与控制。瓦斯管道阻火关系到设备的安全运行，将阻火管道设计成金属波纹带形结构，在火焰穿过金属滤板的狭窄通道的时候使火焰热量的释放与散失不一致将火熄灭，从而达到阻火的效果。

At present, the technologies used in coal mine gas power generation mainly include: gas mixing technology, automatic control technology and flame retardant technology. There are different ways of gas mixing, such as equal vacuum diaphragm mixing, venturi electric control mixer mixing and double butterfly gate mixer electric control mixing, etc. for the low pressure gas mixing, the way of first pressurization and then mixing can be adopted. Generally, the gas extracted from the mine is suitable for premixing with air before increasing, and it can improve economic benefits without pressurization before mixing. In the aspect of automatic control, the collection, display, communication storage and control of information can be realized by using TEM. The fire prevention of gas pipeline is related to the safe operation of the equipment. The fire prevention pipeline is designed as a metal corrugated belt structure. When the flame passes through the narrow channel of the metal filter plate, the heat release and loss of the flame are inconsistent, and the fire is extinguished, so as to achieve the effect of fire prevention.

我国煤炭瓦斯资源十分丰富，主要分布在我国西北与华北地区，如能对其充分开采利用必将很大程序上解决我国现在所面临的能源困境问题，同时利用瓦斯发电可以很大程度上避免环境污染，随着瓦斯发电技术的不断完善，及国家鼓励政策的出台，瓦斯发电项目在我国必将前景广阔。

China's coal and gas resources are very rich, mainly distributed in Northwest China and North China. If it can be fully exploited and utilized, the energy dilemma faced by China will be greatly solved. At the same time, the use of gas power generation can largely avoid environmental pollution. With the continuous improvement of gas power generation technology and the introduction of national incentive policies, gas power generation projects in the China will have a bright future.

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