关键词: 垃圾焚烧, 炉排炉, 水冷壁, 炉衬材料, 出口烟气温度

Abstract: In order to explore the effect of lining materials on the outlet flue gas temperature of waste incineration grate furnaces,the heat conduction of two kinds of water-cooled wall linings (SiC tiles+SiC self-flow mix and SiC castables) was numerically simulated by fluid module FLUENT of finite element analysis software ANSYS.The effects of lining materials and structures on the flue gas temperature in the grate furnace first channel outlet were analyzed.The simulation results were practically applied.The results show that:(1)the flue gas temperature in the first channel outlet is higher when the furnace lining is thicker;the flue gas temperature in the first channel outlet of the SiC castable lining is significantly higher than that of the SiC tiles+SiC self-flow mix lining when the lining thickness is the same;(2)with the fixed thickness of the SiC tiles,the flue gas temperature in the first channel outlet increases with the increasing thickness of the SiC self-flow mix;with the fixed lining thickness,the flue gas temperature in the first channel outlet gets lower as the SiC tiles get thicker;with the fixed working layer thickness,the flue gas temperature in the first channel outlet decreases with the increasing thermal conductivity of the SiC self-flow mix.The onsite application shows that the SiC tiles+SiC self-flow mix lining has lower flue gas temperatures in the first channel outlet,higher boiler thermal efficiency and stronger anti-coking properties than the SiC castable lining under the same operating conditions.

Key words: waste incineration, grate furnace, water-cooled wall, furnace lining materials, outlet flue gas temperature