CuO/Al_2O_3作为载氧剂的流化床化学链燃烧数值模拟  

Numerical Simulation of Fluidized Bed Chemical Looping Combustion Using CuO/Al_2O_3 as Oxygen Carrier

作　　者：李俊[1] 郭雪岩[1] 

机构地区：[1]上海理工大学能源与动力工程学院,上海200093

出　　处：《上海理工大学学报》2012年第1期59-64,共6页Journal of University of Shanghai For Science and Technology

基　　金：上海市重点学科建设资助项目(J50501)

摘　　要：以欧拉-欧拉双流体模型和气固非均相化学反应动力学为基础,嵌入了气固化学反应速率方程和反应内热源项的UDF(自定义函数)程序,对化学链燃烧燃料反应器——鼓泡流化床内气固两相流动及化学反应过程进行了数值模拟,并分析了甲烷进气速度对床内气固两相流动、传热及化学反应速率的影响.结果表明:随着甲烷进气速度增加,床内气固混合更加剧烈,气泡的产生、碰撞和破碎使得气固分布不均,流化质量下降,导致反应器内化学反应速率以及温度分布不均,床内局部存在的高温区域将使颗粒温度过高而烧结,降低了甲烷燃烧效率.Based on the Eulerian-Eulerian bi-fluid model and the ldnetic model of the gas-solid heterogeneous chemical reactions,by adding the UI）F （user defined function） code into Fluent 6.3 flow solver to integrate the chemical reaction medmnism and heat source tern1, the gas-solid flow processes and chemical reactions of the chemical looping combustion in the fuel reactor the spouted fluidized bed were modeled. The influences of methane gas inlet velocities on gas-solid flow feature.heat transfer and chemical reaction rates were analyzed. With an increasing methane inlet velocity, the gas and solids are found to be mixed more intensely and the un- even distribution of gas-solid, lower quality of fluidization,and non-uniform chemical reaction rates and tem- perature will take place due to the fonmtion,collision and burst of the bubbles. It is also tbund that there are some spots of higher temperature in local regions, which may lead to particles agglomeration and lower efficiencies of methane combustion.

关 键 词：化学链燃烧 鼓泡流化床 气固非均相化学反应 数值模拟 

分 类 号：TQ051.13[化学工程]