摘要
CFD模拟是研究垃圾焚烧的重要方法之一,对焚烧炉的设计和运行有重要指导意义。炉排燃烧模拟是链条式焚烧炉模拟的关键部分。利用FLUENT平台开发炉排气固两相流动与燃烧模型,引入颗粒动理学理论(KTGF)描述床层固体的流变性质,考虑垃圾在炉排上的水分蒸发、脱挥发分、挥发分燃烧和焦炭燃尽过程。额定工况模拟结果显示,水分蒸发主要发生在炉排干燥段,对应的床层温度较低,约为400K;挥发分释放及燃烧聚集于燃烧段,最高温度1400K;剩余焦炭继续燃尽于第三段炉排,温度维持在900K。将炉排计算结果导入三维炉膛,经与现场温度测点对比,验证模型的有效性。进一步对比80%和110%工况下的炉排燃烧情况,结果符合预期。研究切实考虑了炉排的实际结构,实现炉排-炉膛的直接耦合计算,为大型炉排式垃圾焚烧炉的CFD模拟提供了一种高效的实用方法。
Computational fluid dynamics(CFD)modelling is an important method to investigate MSW combustion,and is helpful for the design and operation of incinerators.Modelling in-bed thermal conversions plays a key role in the moving grate incinerator simulation.In the present work,an in-bed gas-solid combustion model based on the FLUENT platform was proposed.The rheological properties of the solid phase were described by the kinetic theory of granular flows(KTGF).Moisture evaporation,devolatilization,volatile gas combustion,and char-O2 combustion were taken into account.Maximum continuous rating(MCR)case shows that the evaporation mainly occurs in the drying section of grate,and the bed temperature is about 400 K;volatile is released and ignited in the combustion section with a maximum temperature of 1400 K;char is burnt in the third section with a temperature of 900 K.The bed top conditions of MCR case were then used for 3D steady furnace simulation.The temperature results were verified by the on-site measurements.Case 80%and case 110%were also simulated,the results are as expected.A realistic grate structure was considered and direct grate-furnace coupling is realized,which provides an efficient and practical method for CFD simulation for industrial moving grate MSW incinerators.
作者
单朋
夏梓洪
陈彩霞
杜海亮
黄洁
白力
SHAN Peng;XIA Zihong;CHEN Caixia;DU Hailiang;HUANG Jie;BAI Li(School of Resources&Environmental Engineering,East China University of Science and Technology,Xuhui District,Shanghai 200237,China;Shanghai SUS Environment Co.,Ltd.,Qingpu District,Shanghai 201703,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2020年第2期601-608,共8页
Proceedings of the CSEE
关键词
垃圾焚烧
炉排模拟
气固两相燃烧
颗粒动力学理论
municipal solid wastes(MSW)incineration
grate modelling
gas-solid combustion
kinetic theory of granular flows(KTGF)
