可调节煤粉分配器的风粉两相流动特性数值模拟  

Numerical Simulation of Two-phase Flow Characteristics of Pulverized Coal Distributor

作　　者：石全成 吕为智 周文台 何翔 汪鑫 范卫东[3] SHI Quancheng;LüWeizhi;ZHOU Wentai;HE Xiang;WANG Xin;FAN Weidong(Xinjiang Energy Chemical Wucaiwan Power Plant Co.,Ltd.,Changji 831799,Xinjiang Province,China;Shanghai Power Equipment Research Institute Co.,Ltd.,Shanghai 200240,China;School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]中电投新疆能源化工集团五彩湾发电有限责任公司,新疆昌吉831799 [2]上海发电设备成套设计研究院有限责任公司,上海200240 [3]上海交通大学机械与动力工程学院,上海200240

出　　处：《动力工程学报》2022年第12期1183-1190,1205,共9页Journal of Chinese Society of Power Engineering

摘　　要：针对燃煤机组风粉分配不均及浓度偏差大的问题,设计了一种风粉两相可调节煤粉分配器,该煤粉分配器通过在弯管处加装异型管,以改善风粉分配特性。对煤粉分配器开展了风粉两相流的流动特性数值模拟,研究了分离效率、压损及磨损、速度场、浓度场等的分布。结果表明:对于加装异型管的煤粉分配器,其磨损多发生在浓、稀相各分管中,阻力系数较小,可以使风粉分配偏差保持在10%甚至5%以下,实现一次风粉均匀分配,保证机组运行的稳定性和安全性,符合燃煤机组灵活性改造的趋势。In order to solve the problem of uneven distribution and large concentration deviation of air powder in coal-fired units, an air powder two-phase adjustable coal powder distributor was designed. It was equipped with a special shaped pipe at the elbow, which can improve the distribution characteristics of air powder. Numerical simulation was carried out on the two-phase flow characteristics of pulverized coal distributor, and the distribution of separation efficiency, pressure loss, wear, velocity field and concentration field was studied. Results show that the distribution deviation of air powder can be kept below 10% or even 5% by using the special-shaped coal powder distributor, and the wear mostly occurs in each branch of thick and thin phase and the resistance coefficient is very low. It is beneficial to realize the uniform distribution of primary air powder, ensure the stability and safety of unit operation, and meet the trend of flexibility transformation of coal-fired unit.

关 键 词：煤粉分配器 风粉偏差 数值模拟 磨损 阻力损失 

分 类 号：TM621[电气工程—电力系统及自动化]