垃圾焚烧炉炉内环境与入炉垃圾间的传热分析

用两种方法计算了垃圾焚烧炉中烟气的黑度εｇ和吸收率αｇ，由于烟气中水蒸汽成分较高，所得εｇ、αｇ大于相同温度、相同空间形状下燃煤烟气的εｇ、αｇ，且由单色气体黑度公式推得的经验公式εｇ＝１－ｅ－ｋｐＬ与查图计算有较大偏差。计算了层燃炉中烟气辐射、炉拱辐射、烟气对流３种传热方式对入炉垃圾加热的热流密度，三者处于同一数量级，故炉型设计要综合考虑３种传热的影响。比较了流化床和室燃炉中仅靠烟气对流加热与仅靠烟气辐射加热的着火时间大小，讨论了垃圾颗粒尺寸对加热的影响

Analyses on Heat Transfer Between Ambience Inside Furnace and Input Waste in Waste Incineration

Two methods were used to calculate the blackness ε g and the absorbance α g of flue gases. Because of the high concentration of moisture in flue gases of waste, the obatined results of ε g and α g were larger than that of coal at the same temperature and the same space shape, and the experienced formula ε g=1- e -kpL derived from solo colored radiation had large deviation from calculation by consulting diagrams. The heat transfer rate of waste heating by flue gases radiation, arch radiation and flue gas convection was calculated in a laminary furnace. It was found that the heat transfer rate of these three kinds of methods was in the same magnitude, therefore all the above three kinds of heat transfer had to be considered in design of the furnace type. The ratio of ignition time by convection and radiation of flue gases was also calculated for a fluidized bed and suspended firing furnace with different particle size, and the effect of waste to heat transfer was discussed as well.