(1) A set of heat pipe air preheater is installed at the flue outlet of each of the 12 500 KW gas generator units. The flue gas flow rate of each gas generator unit is 2130 Nm3/h, the heating cold air flow rate is 30000 Nm3/h, and the air circulation resistance is less than 500 Pa. Two high-power (45 kw) fans are used to pressurize the air into the heat pipe heat exchanger, and the heat exchanged air is transported to the coal mine air inlet shaft through thermal insulation pipes and culverts to enter the underground warming shaft.

（2）为了防止瓦斯发电机组尾气泄漏进入井下和井下有害气体反送，在热管空预器热风出口处设计了单向止逆电动风门，并安装了温度、流量、有害气体传感器等输送监控联动系统，发生瓦斯发电机组尾气泄漏和井下有害气体反送时，单向止逆电动风门将自动关闭，热风机断电跳闸关闭。

(2) In order to prevent the leakage of tail gas from the gas generator unit into the underground and the backflow of harmful gas, a one-way check electric damper is designed at the hot air outlet of the heat pipe air preheater, and a transmission monitoring linkage system such as temperature, flow, and harmful gas sensors is installed. When the leakage of tail gas from the gas generator unit and the backflow of harmful gas in the underground occur, the one-way check electric damper will automatically close, and the hot air fan will be powered off and tripped to close.

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（3）安装后的效果：在冬季零下22℃时，进入风井的热风流量为24000Nm3/h，入井初始热风温度62℃，完全达到热风设计要求。

(3) Effect after installation: In winter, at minus 22 ℃, the hot air flow into the air shaft is 24000 Nm3/h, and the initial hot air temperature into the shaft is 62 ℃, fully meeting the hot air design requirements.

2.3、利用瓦斯发电机组尾气余热产生饱和蒸汽供生产工艺使用或者进行余热发电

2.3. Utilize the waste heat from the tail gas of the gas generator unit to generate saturated steam for use in the production process or for waste heat power generation

以2台500kW瓦斯发电机组余热为例，安装热管蒸发器，可以得到压力为0.5MPa压力的饱和蒸汽0.75吨/小时。

Taking the waste heat of two 500 kW gas generating units as an example, installing a heat pipe evaporator can obtain 0.75 tons/hour of saturated steam at a pressure of 0.5 MPa.

低浓度瓦斯发电机组余热回收的经济分析

Economic Analysis of Waste Heat Recovery for Low Concentration Gas Generating Units

余热回收热量可供采暖的面积

Area available for heating by waste heat recovery

500KW低浓度瓦斯发电机组烟道出口尾气温度一般在550℃，尾气流量2130Nm3/h，尾气密度ρ=1.293kg/Nm3，尾气比热C=0.257kcal/kg.℃，经热管换热器换热后尾气温度降至150℃；

The exhaust gas temperature at the flue outlet of a 500KW low concentration gas generator unit is generally 550 ℃, the exhaust gas flow rate is 2130Nm3/h, and the exhaust gas density is ρ= 1.293kg/Nm3, specific heat of tail gas C=0.257kcal/kg. ℃, and the temperature of tail gas decreases to 150 ℃ after heat exchange by heat pipe heat exchanger;

瓦斯发电机组尾气由550℃降至150℃时，释放的热量Q为：

When the tail gas of the gas generator unit decreases from 550 ℃ to 150 ℃, the heat Q released is:

Q=CM（T2-T1）=0.257×1.293×2130（550-150）=2.83×105kcal/h

Q=CM（T2-T1）=0.257 × one point two nine three × 2130（550-150）=2.83 × 105kcal/h

热管换热器换热效率按照η=95%计算，则每台瓦斯发电机组可回收热量为：

Heat exchange efficiency of heat pipe heat exchanger shall be in accordance with η= Based on 95% calculation, the recoverable heat of each gas generator unit is:

Q1=2.83×105×95%=268850kcal/h

Q1=2.83 × one hundred and five × 95%=268850kcal/h

余热回收利用后，单台机组可供热的建筑面积为（单位面积所需热量按60kcal/m2）：

After waste heat recovery and utilization, the building area that can be heated by a single unit is (the required heat per unit area is 60 kcal/m2):

余热回收热量可供洗浴的水量

Amount of water available for bathing after heat recovery

二次处理后的煤矿矿井水质量完全可以满足职工浴池的洗浴需要，矿井水平均温度在20℃左右，通过热管换热器（热管省煤器）加热后的水温可以达到50℃以上，通过管道泵向浴池输送，即洗浴水温提30℃。

The quality of coal mine water after secondary treatment can fully meet the bathing needs of employees in the bathtub. The average horizontal temperature of the mine is around 20 ℃, and the minimum water temperature after heating through a heat pipe heat exchanger (heat pipe economizer) can reach over 50 ℃. The water is transported to the bathtub through a pipeline pump, that is, the bathing water temperature is increased by 30 ℃.

则单台发电机组每小时可供50℃以上的矿井水量为：Q1/A2=9m3

The hourly mine water supply of a single generator unit above 50 ℃ is: Q1/A2=9m3

则单台机组每天可供50℃以上矿井水量为：24×9=216m3

The daily mine water supply of a single unit above 50 ℃ is: 24 × 9=216m3