對(duì)于低濃度瓦斯發(fā)電機(jī)紐，瓦斯產(chǎn)生的能量只有30%—35%被轉(zhuǎn)化為電能，約有30%—35%隨高溫尾氣排出，約 20%—25%被發(fā)動(dòng)機(jī)自身冷卻系統(tǒng)帶走，約 10%以機(jī)身散熱和阻力等想事?lián)p耗。瓦斯發(fā)電機(jī)組余熱利用就是通過專用設(shè)備將機(jī)組排出的高溫尾氣和冷卻系統(tǒng)帶走的熱量回收，再輸送到需要熱源的車間或居民小區(qū)。例如，國(guó)內(nèi)廣泛使用的50OKW低濃度瓦斯發(fā)電機(jī)組，其產(chǎn)生的高溫尾氣熱量經(jīng)熱管空預(yù)器回收后，可向企業(yè)車間供熱風(fēng)，或在冬季向煤礦風(fēng)井巷道供熱風(fēng)防止凍井;如果向辦公室、居民小區(qū)或浴室供熱，可加裝熱管換熱器（熱管省煤器)，每臺(tái)換熱器可產(chǎn)生90℃以上的熱水近4 l噸/小時(shí)，解決4000m2 以上建筑面積采暖或中型浴池洗浴。低濃度瓦斯發(fā)電機(jī)組產(chǎn)生的尾氣只要成分是CO2，溫度在550℃左右，通常情況下，每臺(tái)機(jī)組（500KW）產(chǎn)生的煙氣流量在2130Nm3/h 以上。隨著瓦斯資源的深度開發(fā)，充分利用能源，合理利用瓦斯發(fā)電機(jī)組足氣余熱是人勢(shì)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(fā)電機(jī)組排氣系統(tǒng)安裝熱管余熱回收裝置,即熱管空預(yù)器(熱風(fēng)利用)或熱管換熱器（熱水利用)或熱管蒸發(fā)器（低壓飽和蒸汽利用)，通過熱動(dòng)力循環(huán)設(shè)備（即大功率風(fēng)機(jī)或熱水利用管道循環(huán)泵或蒸汽管道）將低溫交換介質(zhì)（空氣或者軟化水）送到余熱回收裝置，經(jīng)加熱的低溫交換介質(zhì)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(jù)各個(gè)企業(yè)所需要的熱源不同有空氣置換余熱、軟化水置換余熱產(chǎn)生熱水以及軟化水置換余熱產(chǎn)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(fēng)井供熱風(fēng)):在北方的冬季，煤礦風(fēng)井巷道都需要熱風(fēng)爐吸井。把低濃度瓦斯發(fā)電機(jī)組產(chǎn)生的高溫尾氣經(jīng)過熱管空預(yù)器，將冷空氣加熱，可以得到高溫?zé)犸L(fēng)通過煙道與風(fēng)井處得熱管空預(yù)器再次換熱后的熱空氣送入風(fēng)井，從而降低井下熱風(fēng)爐的熱量輸出，節(jié)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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