煤矸石CFB锅炉内气固两相流动特性模拟研究  

Numerical Simulation of Gas-solid Two-phase Flow Characteristics in Coal Gangue CFB Boiler

作　　者：张玥[1] 唐诗洋[1] 丁会敏[1] 王志成[1] ZHANG Yue;TANG Shi-yang;DING Hui-min;WANG Zhi-cheng(Heilongjiang Institute of Energy and Environment,Harbin 150007 China)

机构地区：[1]黑龙江省能源环境研究院,黑龙江哈尔滨150007

出　　处：《自动化技术与应用》2023年第12期136-138,142,共4页Techniques of Automation and Applications

基　　金：黑龙江省应用技术研究与开发计划项目(GA20C010)。

摘　　要：煤矸石的利用是我国能源资源综合利用的重要工作,为了改善煤矸石循环流化床锅炉运行时出现的出力不足和热效率下降,基于计算流体力学方法,探究煤矸石颗粒粒径、入口气体速度对炉膛内气固两相流动特性的影响,得到了不同颗粒粒径、入口气体速度时颗粒速度和体积分数分布。结果表明:流化床在稳定运行时,颗粒体积分数沿轴向呈现出低大高小的S型分布,沿径向呈现出壁面大中间小的凹型分布;颗粒轴向速度呈现出中间高两边低的“环核”流动特征;在空气流速不变时,炉膛内平均颗粒体积分数随炉膛高度增加而减小,颗粒的轴向速度随粒径增大而减小;在颗粒粒径不变时,颗粒速度随流化速度的增大而增大。The utilization of coal gangue is an important work in comprehensive utilization of energy resources.In order to improve the out-put shortage and the decrease of thermal efficiency in the operation of coal gangue circulating fluidized bed boiler,based on the method of computational fluid mechanics,the influences of coal gangue particle size and inlet gas velocity on the characteristics of gas-solid two-phase flow in the furnace are investigated.The particle velocity and volume fraction distributions with different particle size and inlet gas velocity are obtained.The results show that the particle volume fraction presents S-shaped distribution along the axial direction with low,large and high,and concave distribution along the radial direction with large wall surface and small middle.The particle axial velocity presents a"ring core"flow characteristic with high middle and low two sides.When the air velocity is constant,the average particle volume fraction decreases with the increase of furnace height,and the axial velocity decreases with the increase of particle size.When the particle size is constant,the particle velocity increases with the increase of fluidization velocity.

关 键 词：循环流化床 煤矸石 气固两相流 颗粒分布 数值模拟 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]