垃圾焚烧炉排炉二次风配风的CFD优化模拟  

CFD simulation and optimization of secondary air distribution for waste combustion in grate furnace

作　　者：刘瑞媚 刘玉坤 王智化[1] 刘颖祖 胡利华 邵哲如 岑可法[1] 

机构地区：[1]浙江大学能源清洁利用国家重点实验室,浙江杭州310027 [2]光大环保技术装备(常州)有限公司,江苏常州213011

出　　处：《浙江大学学报（工学版）》2017年第3期500-507,共8页Journal of Zhejiang University：Engineering Science

基　　金：国家"973"重点基础研究发展规划资助项目(2012CB214906)

摘　　要：为探究二次风配风对炉排炉中城市固体垃圾焚烧过程的影响,针对某750t/d垃圾焚烧炉排炉,采用数值模拟的方法对炉膛焚烧过程进行热态模拟,就下二次风投、停运,上二次风布置形式和上二次风风速3个因素进行优化分析.模拟结果显示,通过在炉拱下方增加下二次风能对炉膛前、后炉拱形成包覆作用,阻挡高温烟气冲刷,有利于改善炉拱区域的结渣问题;炉膛上二次风对冲布置或适当增大二次风风速(从45m/s增大至65m/s)均能有效促进烟气混合,提高炉膛烟气的充满度,改善温度分布的均匀性;上二次风对冲布置较错列布置能进一步提高烟气停留时间,降低炉膛出口的CO体积分数,从而提高燃烧效率.Waste combustion simulation with computational fluld dynamics（CFD）method in a 750t/d grate furnace was presented to investigate the effect of secondary air distribution on municipal solid waste（MSW）combustion.An optimization analysis was employed to study the effect of lower secondary air operation condition,higher secondary air arrangement and lower secondary air velocity.The simulation results indicate that the scour by high temperature flue gas can be prevented by applying lower secondary air below arches of front and back walls,therefore the high temperature corrosion of arch area can be improved.Opposed arrangement and larger velocity（ranging from 45m/s to 65m/s）of higher secondary air both can promote the full mixing of flue gas,improving the furnace fullness and temperature uniformity.Compared to staggered arrangement,opposed arrangement is more favorable for prolonging gas residence time,lowering outlet concentration of CO and improving the combustion efficiency.

关 键 词：炉排炉 垃圾(MSW)焚烧 计算流体动力学(CFD) 数值模拟 二次风 配风优化 

分 类 号：TK224.1[动力工程及工程热物理—动力机械及工程]