烟气余热回收中填料喷淋换热器的实验分析  

Experimental Analysis of Packed Spraying Heat Exchanger in Waste Heat Recovery From Flue Gas

作　　者：朱晓磊[1] 张磊 孟继安[2] ZHU Xiao-Lei;ZHANG Lei;MENG Ji-An(Shanghai Power Equipment Research Institute,Shanghai 200240,China;School of Aerospace,Tsinghua University,Beijing 100084,China)

机构地区：[1]上海发电设备成套设计研究院,上海200240 [2]清华大学航天航空学院,北京100084

出　　处：《工程热物理学报》2020年第12期3061-3067,共7页Journal of Engineering Thermophysics

摘　　要：在供热机组低温烟气余热回收中,基于传统的混合式换热器(空腔喷雾型换热器)换热能力不足且流动阻力过大的问题,采用所提出的填料喷淋换热技术,设计了新型的填料喷淋型换热器。分别搭建了缩比模型实验台和商业测试实验台,获得并验证了烟气(空气)与淋水在换热器内的分布特性、阻力和传热特性。结果表明,填料喷淋型换热器风速与淋水密度均匀性好,流动阻力小,换热能力强。应用于某供热锅炉其工程运行结果显示,与空腔喷雾换热器相比填料喷淋换热器的余热回收能力提高30%,凝结水回收能力提高20%,进出口压差降低55%,风机功耗降低50%,水泵功耗降低57%。填料喷淋换热技术具有优良的流动与传热传质特性。A new heat exchanger in packed spraying type was designed with the technology proposed for the waste heat recovery of low temperature flue gas in heat supply unit,as the traditional mixing heat exchanger in empty spraying type has low heat exchanging efficiency and large flow resistance problem.The air velocity distribution,water spray distribution,the flow resistance and heat transfer characteristic in the heat exchanger were investigated and verified with the scaling model testbed and commerical debugging testbed bulit.The results show that the packed spraying heat exchanger has uniform air velocity,uniform water drenching density,low flow resistance and large heat transfer capability.With the packed spraying heat exchanger applied to a heat supply boiler the project running results indicate that,the flue gas waste heat recovery ability was increased by 30%,the condensation water recovery ability was increased by 20%,the pressure drop between the inlet and outlet was reduced by 55%,the power consumption of fan was reduced by 50% and the water pump power consumption was reduced by 57% compared with the empty spraying heat exchanger.The packed spraying heat exchange technology has excellent flow,heat and mass transfer charecterisctics.

关 键 词：填料 烟气 传热 流动 余热利用 

分 类 号：TK264[动力工程及工程热物理—动力机械及工程]