印染污泥-煤粉混烧流化床锅炉内颗粒流化行为数值模拟研究  

Numerical simulation of particle fluidization behaviors in a dyeing sludge-coal powder mixing fluidized bed boiler

作　　者：郑小腾 陈星晨 余焕伟 竺哲明 杜锡勇 许磊 ZHENG Xiaoteng;CHEN Xingchen;YU Huanwei;ZHU Zheming;DU Xiyong;XU Lei(Shaoxing Special Equipment Testing Institute,Shaoxing 312071;Shaoxing Key Laboratory of Special Equipment Intelligent Testing and Evaluation,Shaoxing 312071;Institute of Process Equipment and Control Engineering,Zhejiang University of Technology,Hangzhou 310032)

机构地区：[1]绍兴市特种设备检测院,绍兴312071 [2]绍兴市特种设备智能检测与评价重点实验室,绍兴312071 [3]浙江工业大学化工过程机械研究所,杭州310032

出　　处：《高技术通讯》2025年第2期214-226,共13页Chinese High Technology Letters

基　　金：国家自然科学基金(52205172);浙江省自然科学基金(LY23E050015,LTGS24E010002)资助项目。

摘　　要：基于计算流体力学-离散单元法(computation fluid dynamics-discrete element method,CFD-DEM)对含有印染污泥和煤粉颗粒的埋管流化床内气固两相流动力学特性进行了模拟研究。对流化过程中颗粒的混合指数、速度分布、数量比、固含率分布、平均动能分布进行了统计和讨论。实验结果表明,初始上污泥下煤粉填充时,随着气流速度的增大,加剧了煤粉污泥颗粒的分离,过大的气流速度会出现局部完全分离现象。当气流速度达到3.0 m·s^(-1)时,床内煤粉污泥混合填充相较于分层填充时不易发生分离现象。改变流化床内2种颗粒数量的比例时,发现增加煤粉数量可以使污泥分布更加均匀,埋管上方颗粒的平均动能与下方相差较大。A simulation study based on computational fluid dynamics-discrete element method(CFD-DEM)is carried out to investigate the characteristics of gas-solid two-phase flow dynamics in a buried tube fluidised bed containing printing and dyeing sludge and coal powder particles.The mixing index,velocity distribution,number ratio,solid content distribution,and average kinetic energy distribution of the particles in the fluidisation process are statistical-ly analyzed and discussed.The experimetal results show that the separation of coal sludge particles is intensified with the increase of gas velocity when the initial top sludge is filled down with coal powder,and the phenomenon of localised complete separation occurs with too large gas velocity.When the gas velocity reaches 3.0 m·s^(-1),the separation phenomenon is less likely to occur when the bed is filled with mixed coal sludge compared with layered filling.When changing the ratio of the number of the two types of particles in the fluidised bed,it is found that in-creasing the number of coal powder could lead to a more uniform sludge distribution,and that the average kinetic energy of the particles above the buried tube differes greatly from that below.

关 键 词：气固两相流 计算流体力学-离散单元法 流化床 印染污泥 混合 

分 类 号：TK16[动力工程及工程热物理—热能工程]