余热回收的方式根据各个公司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叁种。低浓度瓦斯发电机组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, the methods of waste heat recovery include air replacement for waste heat, demineralized water replacement for waste heat to generate hot water, and demineralized water replacement for waste heat to generate steam. The main uses of waste heat recovery of low concentration gas generator unit 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 shaft (air shaft heating air): In winter in the north, coal mine air shaft roadway needs hot air stove warm shaft. The high temperature tail gas generated by the low concentration gas generator unit passes through the heat pipe air preheater, and the cold air is heated. The high temperature hot air can be sent to the air shaft through the flue and the heat pipe air preheater at the air shaft after heat exchange, thus reducing the heat output of the underground hot air furnace and saving electricity.

（2）烘干、采暖和洗浴用热源：公司生产工艺中的烘干、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）供给公司生产使用，冷却后的软化水在返回热管换热器，如此往复循环。

(2) Heat source for drying, heating and bathing: heat source is required for drying, heating and bathing in the production process of enterprises all year round. A heat pipe heat exchanger (heat pipe economizer) is installed at the outlet of the flue 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 used as a heat source (above 90 ℃) for the production of the enterprise. The cooled softened water is returned to the heat pipe heat exchanger, and so on.

（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 the waste heat of low concentration gas generator unit.

（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，给公司带来可观的经济效益。

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

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