大型燃气锅炉排烟余热深度利用改造工程实测分析

Measurement analysis of large gas-fired boiler flue gas heat deep recovery reconstruction project

针对严寒地区大型煤改气供热锅炉燃料成本高和烟雾大问题,采用自主研发的防腐高效低阻烟气冷凝热回收装置,对新疆骑马山热力站70 MW大型燃气供热锅炉进行了烟气冷凝余热和烟气冷凝水深度回收与除雾节能改造,改造后新增供热面积30万m^2。实测结果表明:在不同锅炉负荷下,烟温从88~180℃降到33~54℃,节能率达13%,锅炉总效率达107.3%;辅以自然空气冷却除湿后,排烟温度降到21~35℃;每台锅炉每天回收烟气冷凝水70~130 t,烟气除湿率达70%,明显减少了烟雾排放;烟气冷凝热回收利用节能、节水、减排、经济效益显著。

Based on the problems of high flue cost and heavy fog emission of the large boiler transforming from coal-fired to gas-fired in severe cold zone, using the anti-corrosive, high-efficient and low-resistant flue gas condensing heat recovery technology and facility, applies the full recovery of the flue gas condensate heat and condensate water heat and energy saving renovation of defogging to the large gas-fired heating boiler with heat capacity of 70 MW at Qimashan heating station in Xinjiang. The heating area increases 0.3 million square meters after renovation. The test results show that the exhaust gas temperature can drop from 88 - 180℃ to 33- 54℃ under different boiler loads, the efficiency of gas utilization can increase 13% and the total efficiency of gas-fired boiler can reach 107.3%. Supplemented by natural air cooling and dehumidifying, exhaust gas temperature can reach 21- 35℃, each boiler produces flue gas condensate water of 70- 130 tons per day, the flue gas dehumidification rate reaches 70%, which significantly improves the fog emissions and contributes to energy saving, water saving, emission reduction and economic benefit.