间歇型排渣系统集渣过程的模拟研究  

Numerical Simulation of Slag-collection Process in a Batch Slag-discharge System

作　　者：于广锁[1] 李贤斌[1] 孙钟华[1] 郭庆华[1] 代正华[1] 黄斌[2] 张玉柱[2] 

机构地区：[1]煤气化教育部重点实验室(华东理工大学),上海市徐汇区200237 [2]神华宁夏煤业集团煤炭化学工业分公司,宁夏回族自治区银川市750004

出　　处：《中国电机工程学报》2012年第32期75-81,13,共8页Proceedings of the CSEE

基　　金：国家自然科学基金(21176078);国家重点基础研究计划项目(2010CB227006)~~

摘　　要：为研究间歇型排渣系统集渣过程中温度及渣的运动状况,建立三维非稳态模型,对排渣系统进行动态模拟,研究了冷却水量及冷却水位置对排渣系统传热及流动的影响。利用混合双流体(Mixture)模型描述二相耦合,液相采用Realizable κ-ε湍流模型计算,固相引入颗粒动力学原理,并利用随机轨道模型跟踪渣颗粒运动轨迹,研究颗粒的运动规律。结果表明:进入激冷室底部水浴的部分黑水尚未换热完全就通过黑水出口离开激冷室,温度较高,并随冷却水量的增加而下降,每增加15t/h,下降5~6℃;一个集渣周期由黑水出口排出的渣约占渣总量的31.8%,并随冷却水量的增加而增加,每增加15t/h,增加2.6%~6.9%;冷却水量越大,锁斗底部渣颗粒受冲击越大。3D unsteady simulation was conducted to investigate the temperature profile and slag particle behaviors in the slag-collection process in a batch slag-discharge system.The dynamic simulation studied the effects of cooling water flux and position on the heat transfer and flow.The Mixture model was applied to study the two-phase flow.The Realizable κ-ε turbulence model was used to calculate the continuous phase flow,and the kinetic theory granular flow was used to model the solid phase,while discrete random walk model was adopted to track the particles’ trajectories to research the characteristics of particle motion.The results indicate that a part of the black water in the bottom of the quench chamber leaves at high temperature without heat transfer completely.And the temperature decreases 5-6 ℃ with increasing the cooling water flux with 15 t/h.About 31.8% mass fraction slag flow out of the black water outlet,and the percentage increases 2.6%-6.9% as increasing the cooling water flux with 15 t/h.In addition,with the cooling water flux increasing,the impact on the particles increases.

关 键 词：动态模拟 离散相 混合双流体模型 排渣系统 颗粒运动 

分 类 号：TQ546[化学工程—煤化学工程]