固定床熔渣气化炉内冷态气固两相流动特性  

Cold model of gas-solid two-phase flow characteristics in fixed bed slagging gasifier

作　　者：杜时 樊俊杰[1] 张忠孝[1] 张乐宇 DU Shi;FAN Junjie;ZHANG Zhongxiao;ZHANG Leyu(School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, Chin)

机构地区：[1]上海理工大学环境与建筑学院,上海200093

出　　处：《洁净煤技术》2018年第2期46-50,共5页Clean Coal Technology

基　　金：国家高技术研究发展计划(863计划)资助项目(2015AA050505)

摘　　要：为了研究固定床熔渣气化炉喷嘴射流速度和安装角度对炉内流场的影响,搭建了固定床熔渣气化炉冷态试验平台,并结合Fluent软件进行了建模。结果发现:(1)随着气体流量和射流速度的不断增加,气体在物料内部的穿透距离不断加长;(2)随着喷嘴下倾角度的增加,射流深度、回流区径向深度及回流区高度呈不断减小趋势;当喷嘴下倾5°~10°布置时为最优工况,料层内部喷嘴方向射流穿透深度适中,炉内流场分布较好;(3)随着喷嘴切圆角度的不断增大,喷嘴对冲碰撞作用越小,气流逐渐偏离径向区域,喷嘴轴截面气体分布量逐渐变少,料层内部射流穿透深度先增大后减小。综合考虑各因素,喷嘴下倾5°并切圆旋转10°布置时,料层内部水平方向射流穿透深度最大,炉内流场分布较好。In order to study the effect of gasifier nozzle jet speed and installation angle of fixed bed slagging gasifier on the flow field in furnace,a cold model experimental platform of the fixed bed slagging gasifier was set up,and Fluent software was combined to simulate the process of gasifier.The results show that with the increase of gas injecting velocity,the penetration distance of the gas inside the material increases.The depth of jet,the radial depth of recirculation zone and the height of recirculation zone decrease continuously with the increase of dipping angle.The optimized dipping angle of the nozzle is 5°-10°achieving the suitable depth of penetration of the jet in horizontal direction inside the material layer and best furnace flow field distribution.With the continuous increase of nozzle tangent angle,the impact of the nozzle hedge collision becomes smaller,and the air flow gradually shifts from the radial region,as well the gas distribution of nozzle axis cross section gradually decreases; while the penetration depth of material jet fluctuates. Comprehensive consideration of various factors,the largest horizontal jet penetration depth inside the material layer and best furnace flow field distribution are obtained with 5° dipping and then 10° rotation of the nozzle.

关 键 词：固定床气化炉 喷嘴 射流速度 流场 

分 类 号：TQ515.6[化学工程]