對于低濃度瓦斯發電機紐，瓦斯產生的能量只有30%—35%被轉化為電能，約有30%—35%隨高溫尾氣排出，約 20%—25%被發動機自身冷卻系統帶走，約 10%以機身散熱和阻力等想事損耗。瓦斯發電機組余熱利用就是通過專用設備將機組排出的高溫尾氣和冷卻系統帶走的熱量回收，再輸送到需要熱源的車間或居民小區。例如，國內廣泛使用的50OKW低濃度瓦斯發電機組，其產生的高溫尾氣熱量經熱管空預器回收后，可向企業車間供熱風，或在冬季向煤礦風井巷道供熱風防止凍井;如果向辦公室、居民小區或浴室供熱，可加裝熱管換熱器（熱管省煤器)，每臺換熱器可產生90℃以上的熱水近4 l噸/小時，解決4000m2 以上建筑面積采暖或中型浴池洗浴。低濃度瓦斯發電機組產生的尾氣只要成分是CO2，溫度在550℃左右，通常情況下，每臺機組（500KW）產生的煙氣流量在2130Nm3/h 以上。隨著瓦斯資源的深度開發，充分利用能源，合理利用瓦斯發電機組足氣余熱是人勢所趨。

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.

在低濃度瓦斯發電機組排氣系統安裝熱管余熱回收裝置,即熱管空預器(熱風利用)或熱管換熱器（熱水利用)或熱管蒸發器（低壓飽和蒸汽利用)，通過熱動力循環設備（即大功率風機或熱水利用管道循環泵或蒸汽管道）將低溫交換介質（空氣或者軟化水）送到余熱回收裝置，經加熱的低溫交換介質變成熱源直接或者再次交換后輸送給終端客戶使用。

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.

余熱回收的方式根據各個企業所需要的熱源不同有空氣置換余熱、軟化水置換余熱產生熱水以及軟化水置換余熱產生蒸汽三種。余熱回收后的主要用途有以下幾種:(1）煤礦巷道吸井〔風井供熱風):在北方的冬季，煤礦風井巷道都需要熱風爐吸井。把低濃度瓦斯發電機組產生的高溫尾氣經過熱管空預器，將冷空氣加熱，可以得到高溫熱風通過煙道與風井處得熱管空預器再次換熱后的熱空氣送入風井，從而降低井下熱風爐的熱量輸出，節約電能。

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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