洁净煤技术

2020, v.26;No.129(05) 181-187

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亚微米颗粒物湍流团聚数值模拟研究
Numerical simulation on the characteristics of submicron particle turbulence agglomeration

冯鹏;盛虎;周虎;王承亮;刘鹤欣;李正鸿;谭厚章;杨富鑫;
FENG Peng;SHENG Hu;ZHOU Hu;WANG Chengliang;LIU Hexin;LI Zhenghong;TAN Houzhang;YANG Fuxin;Key Laboratory of Thermo-Fluid Science and Engineering,Ministry of Education,Xi'an Jiaotong University;Huadian Zhangqiu Power Generation Co.,Ltd.;

摘要(Abstract):

亚微米颗粒物(Submicron Particle)是大气污染物的重要来源之一,危害人体健康,湍流团聚是脱除燃煤烟气中亚微米颗粒的重要手段。利用k-ε湍流模型与离散相(DPM)模型,在亚微米颗粒物湍流团聚试验平台基础上建立了一个由湍流效应和布朗运动共同作用的亚微米颗粒团聚过程的数值模型,根据试验数据对模型进行合理性验证,研究了湍流团聚器的进口流速、扰流件排布、扰流件形状对亚微米颗粒团聚特性的影响规律。结果表明:扰流件迎风面和扰流件的纵向尾迹区是碰撞和聚集的主要区域;小粒径亚微米颗粒物的团聚效率明显大于大粒径,从粒径593.5 nm处团聚效率开始变为负数;不同流速下,由于更小粒径颗粒物在涡流中跟随能力更强,PM_(0.1)的团聚效率均大于PM_1,湍流团聚器的进口流速不宜过大,以保证亚微米颗粒物所需要的停留时间。模拟所采用的三棱柱错排扰流件的最大团聚效率对应的流速为5 m/s;亚微米颗粒物在顺排、错排结构的团聚效率差别不大,但顺排和错排结构对亚微米颗粒物的作用机制有较大差别,顺排结构扰流件尾迹区的涡街得到充分发展,而错排结构包含更多迎风面,增大了颗粒物碰撞几率,更易受到侵蚀;此外,单个扰流件条件下,由于Y型扰流件的产涡能力更强,比圆柱型扰流件和三棱柱型扰流件具有更好的湍流团聚效果。
Submicron particles are one of the important sources of air pollutants,which are harmful to human health. Turbulence agglomeration is a promising technology to remove submicron particles from coal-fired flue gas. Based on the k-ε turbulence model and the discrete phase model( DPM),a numerical model of the agglomeration process of submicron particles that is affected by the turbulence effect and Brownian motion was established on the basis of the experimental platform of submicron particles turbulence agglomeration. The model was verified by the experimental data. The influences of the inlet velocity,the arrangement and the shape of the vortex generators on the agglomeration characteristics of particles were studied. The results show that the main areas of collision and aggregation are the windward side of the generator and the longitudinal wake area of the generator. The agglomeration efficiency of small particle size is significantly higher than that of large particle size,and the agglomeration efficiency is negative at 593.5 nm particle size. At different flow rates,the agglomeration efficiency of PM_(0.1) is higher than that of PM_1 due to the stronger following ability of smaller particle size in the vortex.The inlet velocity of the device should not be too large to ensure the required residence time of particles. The maximum agglomeration efficiency of the tripod staggered generator used in the simulation is observed when the velocity is 5 m/s. The agglomeration efficiency of submicron particles in the sequential and staggered structures is not different,but the interaction mechanism of the sequential and staggered structures on submicron particles is quite different. The vortex street in the wake area of the sequential structure spoiler has been fully developed. The staggered structure contains more windward faces,which increases the probability of particle collision,but it is more vulnerable to particle erosion. In addition,under the condition of a single generator,due to the stronger vortex generation capacity of Y-shaped spoiler,it has better turbulent agglomeration effect than the cylindrical and triangular generator.

关键词(KeyWords): 亚微米颗粒物;湍流团聚;扰流件;数值模拟
sub-micron particulates;turbulent agglomeration;disturbing structure;numerical simulation

Abstract:

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基金项目(Foundation): 国家重点研发计划资助项目(2016YFB0601504)

作者(Author): 冯鹏;盛虎;周虎;王承亮;刘鹤欣;李正鸿;谭厚章;杨富鑫;
FENG Peng;SHENG Hu;ZHOU Hu;WANG Chengliang;LIU Hexin;LI Zhenghong;TAN Houzhang;YANG Fuxin;Key Laboratory of Thermo-Fluid Science and Engineering,Ministry of Education,Xi'an Jiaotong University;Huadian Zhangqiu Power Generation Co.,Ltd.;

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DOI: 10.13226/j.issn.1006-6772.IF20080619

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