(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）為了防止瓦斯發電機組尾氣泄漏進入井下和井下有害氣體反送，在熱管空預器熱風出口處設計了單向止逆電動風門，并安裝了溫度、流量、有害氣體傳感器等輸送監控聯動系統，發生瓦斯發電機組尾氣泄漏和井下有害氣體反送時，單向止逆電動風門將自動關閉，熱風機斷電跳閘關閉。

(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）安裝后的效果：在冬季零下22℃時，進入風井的熱風流量為24000Nm3/h，入井初始熱風溫度62℃，完全達到熱風設計要求。

(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、利用瓦斯發電機組尾氣余熱產生飽和蒸汽供生產工藝使用或者進行余熱發電

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臺500kW瓦斯發電機組余熱為例，安裝熱管蒸發器，可以得到壓力為0.5MPa壓力的飽和蒸汽0.75噸/小時。

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.

低濃度瓦斯發電機組余熱回收的經濟分析

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

余熱回收熱量可供采暖的面積

Area available for heating by waste heat recovery

500KW低濃度瓦斯發電機組煙道出口尾氣溫度一般在550℃，尾氣流量2130Nm3/h，尾氣密度ρ=1.293kg/Nm3，尾氣比熱C=0.257kcal/kg.℃，經熱管換熱器換熱后尾氣溫度降至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;

瓦斯發電機組尾氣由550℃降至150℃時，釋放的熱量Q為：

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

熱管換熱器換熱效率按照η=95%計算，則每臺瓦斯發電機組可回收熱量為：

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

余熱回收利用后，單臺機組可供熱的建筑面積為（單位面積所需熱量按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):

余熱回收熱量可供洗浴的水量

Amount of water available for bathing after heat recovery

二次處理后的煤礦礦井水質量完全可以滿足職工浴池的洗浴需要，礦井水平均溫度在20℃左右，通過熱管換熱器（熱管省煤器）加熱后的水溫可以達到50℃以上，通過管道泵向浴池輸送，即洗浴水溫提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 ℃.

則單臺發電機組每小時可供50℃以上的礦井水量為：Q1/A2=9m3

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

則單臺機組每天可供50℃以上礦井水量為：24×9=216m3

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