不同一次风率下循环流化床流动特性数值模拟  

Numerical Simulation of Flow Characteristics of Circulating Fluidized Bed under Different Primary Air Rates

作　　者：杨敏 朱健 赵博 王林 YANG Min;ZHU Jian;ZHAO Bo;WANG Lin(School of Mechanical and Power Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China;Fushun Special Equipment Supervision and Inspection Institute,Fushun 113000,China;Postdoctoral Workstation,Dalian Boiler Pressure Vessel Inspection a d Testing Institute,Dalian 116000,China;School of Energy and Power Engineering,Dalian University of Technology,Dalian 116033,China)

机构地区：[1]沈阳化工大学机械与动力工程学院,辽宁沈阳110142 [2]抚顺市特种设备监督检验所,辽宁抚顺113000 [3]大连锅炉压力容器检验检测研究院有限公司,辽宁大连116000 [4]大连理工大学,辽宁大连116033

出　　处：《节能技术》2023年第6期517-522,532,共7页Energy Conservation Technology

基　　金：辽宁省教育厅基金(LJKMZ20220771)。

摘　　要：为了研究一二次风配比对循环流化床锅炉冷态流动特性的影响,对三种一次风率(0.46、0.5、0.54)下的循环流化床锅炉物理模型进行数值模拟研究。采用欧拉框架下的双流体(TFM)模型,通过对比炉内颗粒浓度云图、颗粒浓度曲线图和气相轴向速度曲线图,分析炉内颗粒流动形态。数值模拟结果表明:当一次风率增大时,一次风速增大,二次风速降低,炉膛底部入口处颗粒堆积减少,当一次风率为0.46时能够得到一个较好的环核流动形态。因为在炉膛中上部分细颗粒已经得到充分发展,当细颗粒从炉膛出口被夹带到旋风分离器时,分离器内无论浓度场还是速度场,一次风率的改变并未对其造成太大影响。In order to study the influence of primary and secondary air ratio on the cold flow characteristics of circulating fluidized bed boilers,numerical simulation research was conducted on the physical model of circulating fluidized bed boilers under three primary air rates(0.46,0.5,0.54).The two-fluid(TFM)model under the Euler framework is used to analyze the particle flow pattern in the furnace by comparing the particle concentration cloud diagram,particle concentration curve diagram and gas phase axial velocity curve diagram in the furnace.Numerical simulation results show that when the primary air rate increases,the primary wind speed increases,the secondary wind speed decreases,and the particle accumulation at the bottom entrance of the furnace decreases.Because the fine particles in the upper part of the furnace have been fully developed,when the fine particles are entrained from the furnace outlet to the cyclone separator,regardless of the concentration field or velocity field in the separator,the change in the primary air rate does not have a great impact on it.

关 键 词：循环流化床 一次风率 双组分颗粒 流动特性 数值模拟 

分 类 号：TK222[动力工程及工程热物理—动力机械及工程]