燃气锅炉烟气冷凝余热深度回收系统应用与节能分析

Application and energy saving analysis of flue gas condensation waste heat deep recovery systems for gas-fired boilers

为了实现燃气锅炉节能增效与友好排放的目标,针对燃气锅炉排烟温度偏高、能耗大、雾气排放量大等问题,以北京某供热厂燃气锅炉房为例,提出了不同的燃气锅炉烟气冷凝余热深度回收节能改造实施方案,并对2017—2018年供暖季的节能效果进行了检测。结果表明:排烟温度可降至30℃以下,系统综合节能率达10%以上;单套系统每天可产生烟气冷凝水55~78 t/d,有效地减少了烟气中NOx和SO2等有害气体的排放,烟气除雾率达78%,实现了高效能和友好排放,降低了用能成本。

In order to achieve the goal of energy saving,high efficiency and friendly emission of gas-fired boilers,aiming at the problems of high exhaust gas temperature,high energy consumption and large mist emission of gas-fired boilers,taking a gas-fired boiler room of a heating plant in Beijing as an example,proposes different energy saving reconstruction schemes for deep recovery of flue gas condensation waste heat of gas-fired boilers,and tests the energy saving effect during the heating season in 2017-2018.The results show that the flue gas temperature can be reduced to below 30℃,and the comprehensive energy saving rate of the system can be over 10%.A single system can produce 55 to 78 tons of flue gas condensate every day,effectively reducing the emission of NOx and SO2 and other harmful gases,and the mist removal rate of flue gas reaches 78%,which realizes high efficiency and friendly emission and reduces energy cost.