For low concentration gas generator sets, 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 waste heat utilization of 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 500KW low concentration gas generator set widely used in China can generate high-temperature exhaust gas heat that can be recycled by a heat pipe air preheater to provide heating air to enterprise workshops, or to supply hot air to coal mine air shaft tunnels 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 problem of heating a building area of over 4000m2 or bathing in medium-sized bathrooms.

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尾氣余熱是大勢所趨。

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, it is an inevitable trend to fully utilize energy and reasonably utilize the exhaust heat of gas power generation units.

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 unit, which is 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 thermal power circulation equipment (such as high-power fans or hot water utilization pipeline circulation pumps or steam pipelines), The heated low-temperature exchange medium becomes a heat source and is directly or again exchanged before being transmitted to the end customer 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：

The methods of waste heat recovery vary depending on the heat source required by each enterprise, including air replacement for waste heat, softened water replacement for waste heat to generate hot water, and softened water replacement for waste heat to generate steam. The main uses of waste heat recovery include the following:

（1）煤礦巷道暖井（風井供熱風）：在北方的冬季，煤礦風井巷道都需要熱風爐暖井。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。

(1) Coal mine roadway warming up (air shaft heating air): In winter in the north, coal mine air shaft tunnels require a hot air stove to warm up the shaft. By passing the high-temperature exhaust gas generated by the low concentration gas generator unit through the heat pipe air preheater, the cold air is heated to obtain high-temperature hot air. The hot air is then reheated through the flue and the heat pipe air preheater at the air shaft, and then sent to the air shaft, thereby reducing the heat output of the underground hot air furnace and saving electricity.

（2）烘干、采暖和洗浴用熱源：

(2) Heat sources for drying, heating, and bathing:

企業生產工藝中的烘干、采暖和洗浴常年需要熱源。在發電機組煙道出口加裝一臺熱管換熱器（熱管省煤器），通過熱水循環泵幾個低溫水送到熱管換熱器，經過熱交換的軟化水為熱源（90℃以上）供給企業生產使用，冷卻后的軟化水在返回熱管換熱器，如此往復循環。

Drying, heating, and bathing in the production process of enterprises require heat sources throughout the year. Install a heat pipe heat exchanger (heat pipe economizer) at the outlet of the flue of the generator set, and send several low-temperature water to the heat pipe heat exchanger through a hot water circulation pump. The softened water after heat exchange serves as a heat source (above 90 ℃) for production and use by the enterprise. The cooled softened water returns to the heat pipe heat exchanger and circulates back and forth.

（3）余熱制冷：目前廣泛采用溴化鋰吸收式制冷。用熱管蒸發器吸收低濃度瓦斯發電機組余熱回收的熱量。

(3) Waste heat refrigeration: Currently, lithium bromide absorption refrigeration is widely used. Use a heat pipe evaporator to absorb the heat recovered from the waste heat of a low concentration gas generator set.

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