高水分烟气辐射换热实验研究  

Experimental study for radiative heat transfer of high moisture flue gas

作　　者：张坤竹[1] 张衍国[1] 吴占松[1] 

机构地区：[1]清华大学热能工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2002年第12期1667-1669,1673,共4页Journal of Tsinghua University(Science and Technology)

基　　金：北京市科学技术委员会重点项目(954062600)

摘　　要：为克服垃圾中水分含量偏高,燃烧时传热特性与常规燃料存在较大差异的问题,根据热平衡原理,对高水分烟气的辐射换热特性进行了实验研究。进行了对管内径105,150,208mm,烟气温度300～800℃,水蒸汽份额20%～50%的126个工况的实验。结果表明,在高水分条件下,烟气的辐射换热性能显著增强,原有锅炉计算的标准方法已不再适用。考虑到水蒸汽含量的影响,对原有计算公式中的烟气辐射减弱系数进行了修正,得到一种工程上简便实用的计算方法,可满足垃圾焚烧锅炉设计的需要。Municipal solid waste is an unusual energy source with a much higher moisture than normal fuels. The radiative heat transfer characteristics of high moisture content gas from municipal solid waste boilers was studied experimentally according to heat balance theory. The experiments used three different diameter tubes (105 mm, 150 mm and 208 mm), different gas temperatures from 300 ℃ to 800 ℃, and different moisture tractions from 20% to 50%. The results showed that the radiative heat transfer from the highmoisture flue gas was much higher than for dry gas, so previous formulas can not be applied to high moisture gas. A new expression has been developed for high moisture content fuel gas from the experimental data for the design municipal solid waste boilers.

关 键 词：实验研究 垃圾焚烧锅炉 高水分烟气 辐射换热 辐射减弱系数 黑度 换热规律 

分 类 号：X705[环境科学与工程—环境工程] TK124[动力工程及工程热物理—工程热物理]