垃圾焚烧炉炉膛漏风对炉膛传热和系统热量分配的影响

Influence of Air Leakage on Heat Transfer and Distribution in A Waste Incinerator Furnace

根据锅炉热力计算,导出了循环流化床垃圾焚烧锅炉系统热平衡变量的基本关系式,固体物料循环倍率计算关系式。带入实测数据,计算结果表明:随着炉膛出口过量空气系数的增加,将导致炉膛出口烟温,灰浓度,及炉膛传热系数降低;从而降低炉膛吸热量,系统热量分配随之改变.因此,确定锅炉各部件吸热量允许变化范围,进行科学合理分配,是各项热力参数达到最佳值的基本条件。

A Basic heat balance equation treating the relationship between the different relevant variables and a formula for calculating the circulation factor of a waste incineration circulating fluidized bed boiler is being derived by making use of its thermal calculation. Calculation results, obtained by inserting actual test data, show that with increasing excess air coefficient at the furnace＇s outlet, the exhaust gas temperature, the ash concentration and the heat transfer coefficient within the furnace all get reduced, resulting in less heat being absorbed by the furnace as well as a change in the system＇ s heat distribution. It is therefore essential, for the purpose of optimizing all the thermal parameters of the incinerator, to determine the allowable heat absorption range of each boiler component and arrange its distribution reasonably. Figs 4, table 1 and refs 3.