用不同模型研究炉壁黑度对炉膛内热交换的影响  

Influence of Wall Surface Emissivity on the Heat Exchange in Furnaces Studied with Different Models

作　　者：聂宇宏[1] 陈海耿[2] 姚寿广[1] 

机构地区：[1]江苏科技大学机械与动力工程学院,镇江212003 [2]东北大学材料与冶金学院,沈阳110004

出　　处：《动力工程》2005年第4期500-502,516,共4页Power Engineering

基　　金：国家自然科学基金(59974005);江苏省教育厅高校自然科学指导性计划基金(03KJD140022)项目

摘　　要：给出了加热炉和锅炉炉膛内炉气分别为灰体和非灰体的零维段法模型,并用这些模型分别研究了加热炉和锅炉内炉壁黑度变化对炉内热交换的影响。结果表明,当假设加热炉内的炉气为灰体时,无论炉壁是否为辐射绝热面,金属所得的热流都不随炉壁黑度的变化而变,但当加热炉内的炉气为非灰气体时,金属所得的热流随炉壁黑度的增大而增加,这与高辐射率涂料在加热炉上的应用实践是一致的。当炉气温度为定值时,锅炉内的炉壁温度随壁炉黑度的增大而升高,而炉壁吸热量不随炉壁黑度的变化而变。A Zero dimensional zonal model was taken to study the influence of wall surface emissivity on the heat exchange in stoves and boiler furnace with the gases treated as grey bodies and also as non-grey bodies. Results show that when the gas is assumed to be a grey body, the heat flux received by the metal surface won＇ t change with the wall surface emissivity, no matter whether the wall is a heat-insulated surface or not. But the heat flux the metal surface receives increases with increasing wall surface emissivity, in case the gas in the furnace is treated as a non-grey body, which is in accord with the practice of applying coatings of high emissivity to stoves. If the gas temperature is taken constant, the wall temperature of boiler furnace increases with increasing surface emissivity, while the heat flux absorbed by the wall won＇t change with the surface＇s emissivity. Figs 5 and refs 7.

关 键 词：动力机械工程 炉膛 炉壁黑度 段法模型 

分 类 号：TK224.13[动力工程及工程热物理—动力机械及工程] TK124