掺二次热风加热脱硫出口净烟气技术的经济性

脱硫设备的烟气加热器积灰堵塞问题是困扰电厂的老大难问题,目前尚无好的解决方法。掺二次热风加热脱硫塔出口净烟气技术的工程应用是取代烟气加热器的创新尝试之一。对掺二次热风加热脱硫塔出口净烟气技术的运行经济性进行了详细的理论分析与研究,并与脱硫设备蒸汽加热器技术进行经济性比较,结果表明：以净烟气温度被提升30 ℃计算,掺二次热风加热脱硫塔出口净烟气技术对机组供电煤耗的影响高达4.3 g/（kW·h）以上,比蒸汽加热器技术至少高出0.3 g/（kW·h）,这将在很大程度上制约掺二次热风加热脱硫塔出口净烟气技术的工程应用。

Economical efficiency of the technology using secondary hot air for heating cleaned outlet flue gas of the FGD

Fly ash deposition and wall up in the flue gas heater of the FGD is an old and difficult problem,and there is no better measure to resolve the problem.It is one of the innovations that the secondary hot air was used to heat the outlet flue gas of the FGD instead of the flue gas heater.The economical efficiency of the technology was theoretically discussed and analyzed in detail,and was compared with the economical efficiency using the steam heater. The results show that when using the technology of adding secondary hot air into the outlet flue gas of the FGD and the temperature of the clean flue gas increasing to 30 ℃,the net coal consumption rate was increased to more than 4.3 g /(kW·h),which was at least 0.3 g /(kW·h) more than the net coal consumption rate when using technology of steam heater.It will largely limit the engineering application of the technology of adding secondary hot air into the outlet flue gas of the FGD.