For gas generator sets, only 30% - 35% of the energy generated by gas is converted into electric energy, about 30% - 35% is discharged with high-temperature tail gas, about 20% - 25% is taken away by the engine's own cooling system, and about 10% is consumed by other losses such as body heat dissipation and resistance. The waste heat utilization of gas generator unit is to recover the high-temperature tail gas discharged by the unit and the heat taken away by the cooling system through special equipment, and then transport it to the workshop or residential area requiring heat source.

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：

According to the different heat sources required by each enterprise, there are three ways of waste heat recovery: air replacing waste heat, demineralized water replacing waste heat to produce hot water and demineralized water replacing waste heat to produce steam. The main uses of waste heat recovery are as follows:

（1）煤矿巷道暖井（风井供热风）：在北方的冬季，煤矿风井巷道都需要热风炉暖井。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。

(1) Coal mine roadway warm-up shaft (air shaft heating air): in northern winter, coal mine air shaft roadway needs hot-air stove warm-up shaft. The high-temperature tail gas generated by the low concentration gas generator unit passes through the heat pipe air preheater and heats the cold air. The high-temperature hot air can be obtained. The hot air after heat exchange through the heat pipe air preheater at the flue and air shaft is sent to the air shaft, so as to reduce the heat output of the underground hot blast stove and save electric energy.

（2）烘干、采暖和洗浴用热源：

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

企业生产工艺中的烘干、采暖和洗浴常年需要热源。在发电机组烟道出口加装一台热管换热器（热管省煤器），通过热水循环泵几个低温水送到热管换热器，经过热交换的软化水为热源（90℃以上）供给企业生产使用，冷却后的软化水在返回热管换热器，如此往复循环。

The drying, heating and bathing in the production process of the enterprise need heat source all the year round. A heat pipe heat exchanger (heat pipe economizer) is installed at the flue outlet of the generator set, and several low-temperature water is sent to the heat pipe heat exchanger through the hot water circulating pump. The softened water after heat exchange is supplied to the enterprise for production and use as a heat source (above 90 ℃), and the cooled softened water is returned to the heat pipe heat exchanger for reciprocating circulation.

（3）余热制冷：目前广泛采用溴化锂吸收式制冷。用热管蒸发器吸收低浓度瓦斯发电机组余热回收的热量。

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

（4）余热发电：通过多台瓦斯发电机组尾气的余热回收，安装热管蒸发器，产生的饱和蒸汽并往后拖动汽轮机组进行二次发电，发电后的冷凝水亦可制冷或者供暖，给企业带来可观的经济效益。

(4) Waste heat power generation: through the waste heat recovery of tail gas of multiple gas generator units, install heat pipe evaporator, generate saturated steam and drag the steam turbine unit back for secondary power generation. The condensate after power generation can also be cooled or heated, bringing considerable economic benefits to the enterprise.