何 涛，王 佳，何庆中，廖伯权
（四川轻化工大学 机械工程学院，四川 宜宾 644007）
DOI:10.13732/j.issn.1008-5548.2022.01.015
收稿日期： 2021-08-02，修回日期：2021-12-01，在线出版时间：2021-12-08。
基金项目：四川省科技厅科技成果转化项目，编号：2017CC0046；自贡市科技计划项目，编号：2018GYCX22。
第一作者简介：何涛(1997—)，男，硕士研究生，研究方向为余热锅炉及其辅助设备设计。E-mail：1256530593@qq.com。
通信作者简介：王佳(1980—)，副教授，博士，硕士生导师，研究方向为机械优化设计。E-mail：wangjiayuting@163.com。
摘要：采用EDEM软件，模拟循环流化床锅炉冷渣管分别采用无翅片、直翅片、直角翅片、大弯角翅片时灰渣颗粒的混合效应；对比分析不同时刻灰渣颗粒的混合指数、单个粒子的循环运动特性以及管壁棱角处颗粒的混合状态。结果表明：在快速混合阶段，直角翅片与大弯角翅片的灰渣颗粒混合指数变化更剧烈，混合时间为20 s时，无翅片、直翅片、直角翅片、大弯角翅片的灰渣颗粒混合指数依次为0.38、 0.41、 0.43、 0.46;在稳定混合阶段，管壁棱角处的混合效应按无翅片、直翅片、直角翅片、大弯角翅片顺序依次增大；从单个颗粒的运动轨迹来看，直角翅片对单个运动颗粒的提升高度最高，但大弯角翅片对单个运动颗粒的提升次数最多；改变翅片结构能明显提高灰渣颗粒混合效应，大弯角翅片结构的混合效应最好。
关键词：翅片结构;冷渣管;灰渣颗粒;混合效应;混合指数
Abstract：EDEM software was used to simulate the mixing effect of ash particles when the cold slag tube of circulating fluidized bed boiler adopted non-fin, straight fin, right-angle fin and large-angle fin.The mixing index of ash particles at different times, the cyclic movement characteristics of individual particles and the mixing state of particles at the corners of the tube wall were compared and analyzed.The results show that the mixing index of the ash particles of the right-angled fins and the large-angled fins changes more drastically in the rapid mixing stage. When the mixing time is 20 s, the mixing index of ash particles of no fins, straight fins, right-angle fins and large-angle fins are 0.38, 0.41, 0.43 and 0.46 in sequence.In the stable mixing stage, the mixing effect at the edges and corners of the tube wall increases in the order of no fins, straight fins, right-angle fins and large-angled fins.From the point of view of the movement path of a single particle, the right-angled fins has the highest lifting height for a single particle, but the large-angled fins has the most lifting times for a single particle.Changing the fin structure obviously improves the mixing effect of ash particles, and the mixing effect of the large-angle fin structure is the best.
Keywords：fin structure; cooling tube; ash particles; mixing effect; mixed index
参考文献（References）：
[1]程乐鸣, 许霖杰, 夏云飞, 等.600MW超临界循环流化床锅炉关键问题研究[J].中国电机工程学报, 2015, 35(21): 5520-5532.
[2]张立栋, 韦庆文 ,王擎.回转干馏炉内挡板形状对二元颗粒运动混合的影响[J].浙江大学学报(工学版), 2018, 52(8): 1542-1550.
[3]侯志超.螺带混合机中颗粒流动与混合特性的数值模拟研究[D].杭州: 浙江大学, 2019.
[4]孟京源.不同回转装置内颗粒系统运动规律和混合的研究[D].长春: 东北电力大学, 2019.
[5]李建.油页岩固体热载体干馏炉内颗粒传热过程模拟研究[D].长春: 东北电力大学, 2018.
[6]XIAO X W, TAN Y Q, ZHANG H, et al.Experimental and DEM studies on the particle mixing performance in rotating drums:effect of area ratio[J].Powder Technology, 2017, 314: 182-194.
[7]XIAO H R, ZHANG M, ZHANG Y, et al.Design and operation of the double-cylinder rotary ash cooler for large CFB boilers[J].Applied Thermal Engineering, 2020, 171: 1359-4311.
[8]杨世铭, 陶文铨.传热学[M].北京: 高等教育出版社, 2006: 555-558.
[9]王擎, 李建, 王智超, 等.回转干馏炉内颗粒间传热特性的数值模拟[J].化工学报, 2017, 68(11): 4137-4146.
[10]MINDLIN R D.Compliance of elastic bodies in contact[J].Journal of Applied Mechanics, 1949, 16: 259-268.
[11]COOk B K, JENSEN R P.Discrete element methods: numerical modeling of discontinua[M].Virginia: American Society of Civil Engineers, 2002: 403-408.
[12]GUPTA A, ANDRé K,SOETEMAN B, et al.Discrete element study mixing in an industrial sized mixer[J].Nurnberg Messe Gmbh, 2010, 90(10): 101-109.
[13]张紫薇, 葛良, 桂南, 等.转速对三维滚筒内颗粒混合特性的影响[J].中国科学院大学学报, 2017, 34(2): 218-225.
[14]AURICCHIO F, BOFFI D, GASTLDI L, et al.On a fictitious domain method with distributed Lagrange multiplier for interface problems[J].Applied Numerical Mathematics Transactions of Imacs, 2015, 95: 36-50.
