CFB锅炉炉膛内颗粒横向扩散系数研究  

Experimental Study on Lateral Dispersion Coefficient of Solid Particles in a CFB Boiler

作　　者：胡南[1] 郭兆君[1] 杨海瑞[2] 吕俊复[2] 裴育峰[1] 

机构地区：[1]中国电力工程顾问集团东北电力设计院有限公司,长春130021 [2]清华大学热科学与动力工程教育部重点实验室,北京100084

出　　处：《动力工程学报》2016年第3期168-171,206,共5页Journal of Chinese Society of Power Engineering

摘　　要：在300MW单炉膛循环流化床（CFB）锅炉按1/10比例缩小的实验装置上，利用热颗粒作为示踪颗粒，研究了流化网速对密相区颗粒横向扩散系数的影响．通过本文实验及文献中的理论分析和大量实验结果，拟合出新的横向扩散系数计算关联式，并采用此关联式预测了大型CFB锅炉炉膛内固体颗粒的横向扩散系数．结果表明：随着流化风速的减小，颗粒扩散能力减弱，横向扩散系数降低；不同尺寸、不同工况下的CFB锅炉密相区颗粒横向扩散系数为0．06～0．4m^2／s．The effect of gas velocity on lateral dispersion coefficient in dense zone of a 300 MW sing nace CFB boiler was investigated in a 1： 10 scale test setup by taking hot solids as the tracer partic e-fur- es. A new correlation of dispersion coefficient was fitted through the data from current study and former investi- gation, with which the lateral dispersion coefficient of solid particles in large CFB boilers was predicted. Results show that the dispersion ability weakens and the lateral dispersion coefficient reduces with the rise of gas velocity. For CFB boiler of different sizes, the lateral dispersion coefficient in dense zone lies in 0.06-0.4 m^2/s under various working conditions.

关 键 词：循环流化床锅炉 横向扩散系数 密相区 流化风速 

分 类 号：TK224[动力工程及工程热物理—动力机械及工程]