气化炉与辐射废锅接口壁面熔渣流动数值模拟  

Numerical simulation of molten-slag flow in the connection wall of gasifier to radiant syngas cooler

作　　者：龚岩[1] 倪建军[1] 梁钦锋[1] 周志杰[1] 于广锁[1] 

机构地区：[1]华东理工大学煤气化教育部重点实验室,上海200237

出　　处：《计算机与应用化学》2010年第7期858-864,共7页Computers and Applied Chemistry

基　　金：国家自然科学基金(20876048);国家863项目"高效化学热回收煤气化新技术应用研究"(2008AA05Z310);国家重点基础研究计划项目(2004CB217703);教育部新世纪优秀人才支持计划(NCET-06-0416)

摘　　要：应用商业软件FLUENT,对用于200MW级IGCC发电的2000t煤/d级多喷嘴对置式水煤浆气化炉接口内合成气和熔渣的流动进行了模拟与研究。经过合理简化和假设,建立了数学模型。采用重整化群(RNG)k-ε湍流模型计算接口内湍流流动,应用VOF模型对熔渣层与合成气相界面进行追踪,应用DTRM模型进行辐射模拟计算。模拟结果表明:在接口倾角小于35°时,熔渣不能顺利流下,将不断堆积且很可能形成渣堵;而在较大倾角以及接口直筒段内,熔渣均能稳定挂壁并对耐火砖层或水冷壁形成保护,且不同角度下的渣层厚度变化不大。分析了熔渣在流动过程中的现象及特征。经检验,模拟结果与相关文献及实验结果吻合较好。FLUENT was applied to simulate the motion of molten slag and syngas through the transition of opposed multi-burner gasifier to waste heat recovery boiler for the 200 MW class IGCC power station which utilize 2000t /d of coal.Through simplification and reasonable assumptions,a mathematical model has been established.The RNG k-εmodel was used to simulate the turbulent flow in the connection while the VOF model was used to track the interface of molten slag and syngas,and the DTRM model was applied to accomplish the radiation simulation.The result showed that when the inclination angle of transition is less than 35 degree,the molten slag was not able to flow off smoothly and could possibly block up.In the condition of larger inclination angle or straight section,molten slag could cling the wall steadily and protect the refractory.In different inclination angle,the thickness of slag layer didn＇t change much.The phenomena and character of molten slag flow were analyzed.After testing,simulation results agreed with the related reference and experiment results.

关 键 词：多喷嘴对置式气化炉 熔渣流动 数值模拟 辐射废锅 

分 类 号：O359.1[理学—流体力学]