高水分烟气的热物理性质

Thermophysical Properties of Flus Gas with High Moisture

在燃用废弃物的特种锅炉中，烟气的水分容积含量ｒＨ２Ｏ达到或超过了常用锅炉热力计算标准２５％ 的上限，需要对原有的计算方法及公式进行检验和修正。本文使用线性规则和混合物规则分别计算了不同水分含量的气体混合物的热物理性质以及相应的对流换热特性，得到了物性随温度及水蒸汽容积含量变化的曲线。分析表明，在锅炉尾部低温区的对流换热受热物性影响较大，对高水分的烟气需进行修正。

For the boiler burning garbage,the moisture content of flue gas may be higher than 25% and exceed the upper limit for thermodynamic calculation standard of the boiler.Equations and method need to be tested and modified.The authors calculate the thermophysical properties through linear and mixture rules,and the results show that,at the low temperature section of the boiler,the convection heat transfer is obviously influenced by thermophysical properties,and hence,for a high moisture content gas the modification of the convection heat transfer calculation is necessary.