旋风分离器流场分析与结构优化的数值模拟
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摘要
采用计算流体力学模拟方法对旋风分离器内气相流场和颗粒运动进行了分析,并运用单因素变量控制方法研究了旋风分离器中排气芯管直径及插入深度、颗粒收集口直径、筒体长度、锥体段长度、气体入口处方形截面尺寸等对颗粒分离率的影响,提出对应的结构优化方案.研究结果表明,气相流场中静压和总压分布具有较好的轴对称性,动压分布与流体速度分布基本相同;粒径为5um和10um的颗粒分离率较差.气体入口处方形截面尺寸、颗粒收集口直径、排气芯管直径对颗粒分离率的影响较大.优化后的旋风分离器中10um及以上粒径的颗粒分离率均达90%以上.
Computational fluid dynamics simulation method was applied to conduct the numerical analysis on the internal gas flow field and particles movement mechanism of cyclone separator and for putting forward the structure optimization scheme of cyclone separator,the influence of exhaust core pipe diameter,exhaust core pipe suction depth,particle collection diameter,cylinder length,cone length and gas-inlet square section size of cyclone separator,on the particles separation rate were analyzed through single factor controlling method.Results indicated that the static pressure distribution and total pressure distribution of gas flow field had a good characteristics of being axial-symmetric.The dynamic pressure distribution characteristics was basically consistent with the velocity distribution.The separation rate for the particles of 5 um and 10 um was not good.The influence of gas-inlet square section size,exhaust core pipe diameter and particle collection diameter on particles separation rate were quite big.The particle separation rate of 10 um and above particles in the optimized cyclone separator is over 90%.
Computational fluid dynamics simulation method was applied to conduct the numerical analysis on the internal gas flow field and particles movement mechanism of cyclone separator and for putting forward the structure optimization scheme of cyclone separator,the influence of exhaust core pipe diameter,exhaust core pipe suction depth,particle collection diameter,cylinder length,cone length and gas-inlet square section size of cyclone separator,on the particles separation rate were analyzed through single factor controlling method.Results indicated that the static pressure distribution and total pressure distribution of gas flow field had a good characteristics of being axial-symmetric.The dynamic pressure distribution characteristics was basically consistent with the velocity distribution.The separation rate for the particles of 5 um and 10 um was not good.The influence of gas-inlet square section size,exhaust core pipe diameter and particle collection diameter on particles separation rate were quite big.The particle separation rate of 10 um and above particles in the optimized cyclone separator is over 90%.
引文
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[19]王乐勤,郝宗睿,王循明,等.筒体长度对旋风分离器内流场影响的数值模拟[J].工程热物理学报,2009,30(2):223-226.
[20]董敏,刘淑良,杨洪征.结构参数和操作参数对旋风分离器性能的影响[J].选煤技术,2013(6):93-96.
[21]李琴,邹康,刘海东,等.基于颗粒受力的旋风分离器冲蚀机理的研究[J].流体机械,2017,45(3):42-47.
[2]苏伟,武晶晶,于建奇,等.旋风分离器的气相流场的性能分析及数值模拟[J].机械制造与自动化,2017,46(3):161-163.
[3]刘旭,朱海雷.旋风分离器数值模拟[J].压缩机技术,2016(2):53-57.
[4]李铁,郑瀚,宋济洋,等.旋风分离器数值模拟及结构优化研究进展[J].矿山机械,2014(11):10-13.
[5]雷蕾,袁隆基.循环流化床锅炉旋风分离器性能特性数值模拟[J].江苏大学学报(自然科学版),2015,36(2):148-152.
[6]Rahimian M H.Multiphase flow and tromp curve simulation of dense medium cyclones using computational fluid dynamics[J].Journal of Mining&Environment,2013,4(1):67-76.
[7]Luan Y,Sun H.Experimental and numerical study on the resistance performance of an axial flow cyclone separator[J].Mathematical Problems in Engineering,2015,2015:1-9.
[8]祝华腾,陈光辉,王伟文,等.不同结构的旋风分离器二次涡的数值模拟和分析[J].高校化学工程学报,2017,31(5):1 062-1 071.
[9]赵立正,原奇鑫,康志忠,等.超临界循环流化床旋风分离器结构优化数值模拟[J].锅炉技术,2016,47(3):31-37.
[10]王江云,冯留海,张果,等.单入口双进气道旋风分离器内冲蚀特性[J].石油学报(石油加工),2016,32(2):289-296.
[11]Ma L,Fu P B,Wu J P,et al.CFD simulation study on particle arrangements at the entrance to a swirling flow field for improving the separation efficiency of cyclones[J].Aerosol&Air Quality Research,2015,15(6S):2 456-2 465.
[12]Sun X,Kim S,Yang S D,et al.Multi-objective optimization of a stairmand cyclone separator using response surface methodology and computational fluid dynamics[J].Powder Technology,2017,320:51-65.
[13]郑建祥,周天鹤.旋风分离器排气管缩口半径优化的数值模拟[J].流体机械,2015,43(12):28-32.
[14]马欣,徐洋洋,徐洋,等.排气管外延伸长度对旋风分离器性能的影响[J].过程工程学报,2016,16(6):915-921.
[15]钱付平,章名耀.旋风分离器分离性能的经验模型与数值预测[J].东南大学学报(自然科学版),2005,35(1):35-39.
[16]刘琳.旋风分离器内气固两相流数值模拟与稳定性研究[D].杭州:浙江理工大学,2016.
[17]张海红.旋风分离器流场与分离性能的数值模拟研究[D].郑州:郑州大学,2004.
[18]韩婕,刘阿龙,彭东辉,等.旋风分离器两相流动数值模拟研究进展[J].天然气化工(C1化学与化工),2012,37(5):55-61.
[19]王乐勤,郝宗睿,王循明,等.筒体长度对旋风分离器内流场影响的数值模拟[J].工程热物理学报,2009,30(2):223-226.
[20]董敏,刘淑良,杨洪征.结构参数和操作参数对旋风分离器性能的影响[J].选煤技术,2013(6):93-96.
[21]李琴,邹康,刘海东,等.基于颗粒受力的旋风分离器冲蚀机理的研究[J].流体机械,2017,45(3):42-47.