对于低浓度瓦斯发电机纽，瓦斯产生的能量只有30%—35%被转化为电能，约有30%—35%随高温尾气排出，约 20%—25%被发动机自身冷却系统带走，约 10%以机身散热和阻力等想事损耗。瓦斯发电机组余热利用就是通过专用设备将机组排出的高温尾气和冷却系统带走的热量回收，再输送到需要热源的车间或居民小区。例如，国内广泛使用的50OKW低浓度瓦斯发电机组，其产生的高温尾气热量经热管空预器回收后，可向企业车间供热风，或在冬季向煤矿风井巷道供热风防止冻井;如果向办公室、居民小区或浴室供热，可加装热管换热器（热管省煤器)，每台换热器可产生90℃以上的热水近4 l吨/小时，解决4000m2 以上建筑面积采暖或中型浴池洗浴。低浓度瓦斯发电机组产生的尾气只要成分是CO2，温度在550℃左右，通常情况下，每台机组（500KW）产生的烟气流量在2130Nm3/h 以上。随着瓦斯资源的深度开发，充分利用能源，合理利用瓦斯发电机组足气余热是人势所趋。

For low concentration gas generators, only 30% -35% of the energy generated by gas is converted into electrical energy, about 30% -35% is discharged with high-temperature exhaust gas, about 20% -25% is taken away by the engine's own cooling system, and about 10% is lost due to factors such as body heat dissipation and resistance. The utilization of waste heat from gas generator units refers to the recovery of high-temperature exhaust gas and heat carried away by the cooling system through specialized equipment, and then transported to workshops or residential areas that require heat sources. For example, the widely used 50OKW low concentration gas generator set in China generates high-temperature exhaust gas heat that can be recovered by a heat pipe air preheater to provide heating air to the enterprise workshop, or to supply hot air to the coal mine ventilation shaft in winter to prevent freezing of the well; If heating is provided to offices, residential areas, or bathrooms, a heat pipe heat exchanger (heat pipe economizer) can be installed. Each heat exchanger can generate nearly 4 tons/hour of hot water above 90 ℃, solving the heating problem for buildings with an area of over 4000m2 or medium-sized bathrooms. The exhaust gas generated by low concentration gas generator units, as long as the component is CO2 and the temperature is around 550 ℃, usually the flue gas flow rate generated by each unit (500KW) is above 2130Nm3/h. With the deep development of gas resources, the full utilization of energy and the rational utilization of the remaining heat from gas power generation units are the trends of human beings.

在低浓度瓦斯发电机组排气系统安装热管余热回收装置,即热管空预器(热风利用)或热管换热器（热水利用)或热管蒸发器（低压饱和蒸汽利用)，通过热动力循环设备（即大功率风机或热水利用管道循环泵或蒸汽管道）将低温交换介质（空气或者软化水）送到余热回收装置，经加热的低温交换介质变成热源直接或者再次交换后输送给终端客户使用。

Install a heat pipe waste heat recovery device in the exhaust system of a low concentration gas generator set, which includes a heat pipe air preheater (for hot air utilization), a heat pipe heat exchanger (for hot water utilization), or a heat pipe evaporator (for low-pressure saturated steam utilization). The low-temperature exchange medium (air or softened water) is sent to the waste heat recovery device through a thermal power circulation equipment (such as a high-power fan or hot water utilization pipeline circulation pump or steam pipeline), The heated low-temperature exchange medium can be transformed into a heat source or exchanged again before being transported to end customers for use.

余热回收的方式根据各个企业所需要的热源不同有空气置换余热、软化水置换余热产生热水以及软化水置换余热产生蒸汽三种。余热回收后的主要用途有以下几种:(1）煤矿巷道吸井〔风井供热风):在北方的冬季，煤矿风井巷道都需要热风炉吸井。把低浓度瓦斯发电机组产生的高温尾气经过热管空预器，将冷空气加热，可以得到高温热风通过烟道与风井处得热管空预器再次换热后的热空气送入风井，从而降低井下热风炉的热量输出，节约电能。

The methods of waste heat recovery vary depending on the different heat sources required by each enterprise, including air replacement of waste heat, softened water replacement of waste heat to generate hot water, and softened water replacement of waste heat to generate steam. The main uses of waste heat recovery are as follows: (1) Coal mine roadway suction shaft (air shaft heating air): In winter in the north, coal mine air shaft tunnels require hot air stove suction shaft. The high-temperature exhaust gas generated by the low concentration gas generator unit is heated by a heat pipe air preheater to obtain high-temperature hot air. The hot air is then reheated by the heat pipe air preheater at the flue and air shaft, and then sent to the air shaft to reduce the heat output of the underground hot air furnace and save electricity.

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