不同数量并联微旋风分离器分离性能影响研究
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摘要
为了考察不同并联旋风分离器的分离性能,运用计算流体力学(CFD)软件对由不同数量、直径为30mm的微旋风元件构成的并联分离器性能特征进行了数值研究。结果表明,当微旋风元件入口气速一致时,增加微旋风元件数量,虽然各并联分离器对5μm以下、中位粒径3.5μm颗粒的总分离效率基本相同,但对3μm以下颗粒的分级效率有所下降;组合分离器灰斗中排尘管间间距减小,微旋风元件内切向速度分布几乎不变,中心轴向速度下降,排尘管尾端气流更加紊乱;随着微旋风元件数量增加,各组合分离器微旋风元件排尘管段旋流稳定性系数S_v沿轴向逐渐增大,微旋风元件内旋流稳定性变差。
The performance of parallel separators composed of different numbers of micro-cyclone elements(diameter = 30 mm) was numerically studied by CFD. The results show that when the inlet gas velocity keeps constant and the numbers of micro-cyclone elements increases, the total separation efficiency of each combined separator decreases in treating particles with diameter less than 3μm, although this value has not obvious variation for particles with diameter <5 μm and volume average particle size = 3.5 μm. As the number of micro-cyclone element increases, the space between the dust discharge tubes in the dust bowl decreases and the tangential velocity distribution in the micro-cyclone element remains almost unchanged. The central axial velocity decreases and air low at the dust discharge tube tail becomes more disorder. As the number of micro-cyclone element increases, the cyclone stability coefficient(S_v) of the dust tube gradually increases along the axial direction, and the cyclone stability in the micro-cyclone element decreases.
The performance of parallel separators composed of different numbers of micro-cyclone elements(diameter = 30 mm) was numerically studied by CFD. The results show that when the inlet gas velocity keeps constant and the numbers of micro-cyclone elements increases, the total separation efficiency of each combined separator decreases in treating particles with diameter less than 3μm, although this value has not obvious variation for particles with diameter <5 μm and volume average particle size = 3.5 μm. As the number of micro-cyclone element increases, the space between the dust discharge tubes in the dust bowl decreases and the tangential velocity distribution in the micro-cyclone element remains almost unchanged. The central axial velocity decreases and air low at the dust discharge tube tail becomes more disorder. As the number of micro-cyclone element increases, the cyclone stability coefficient(S_v) of the dust tube gradually increases along the axial direction, and the cyclone stability in the micro-cyclone element decreases.
引文
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[18]KUMAR V,JHA K.Numerical investigations of the cone-shaped vortex finders on the performance of cyclone separators[J].Journal of Mechanical Science and Technology,2018,32(11):5293-5303.
[19]AZADI M,,MOHEBBI A.A CFD study of the effect of cyclone size on its performance parameters[J].Journal of Hazardous Materials,2010,182(1/2/3):835.
[20]PENG W,HOFFMANN A C,Boot P J A J,et al.Flow pattern in reverse-flow centrifugal separators[J].Powder Technology,2002,127(3):212-222.
[21]高翠芝,孙国刚,董瑞倩.排气管对旋风分离器轴向速度分布形态影响的数值模拟[J].化工学报,2010,61(9):2409-2416.GAO C Z,SUN G G,DONG R Q.Numerical simulation of the influence of exhaust pipe on the axial velocity distribution of cyclone separator[J].CIESC Journal,2010,61(9):2409-2416.
[22]吴小林,熊至宜,姬忠礼,等.旋风分离器旋进涡核的数值模拟[J].化工学报,2007,58(2):383-390.WU X L,XIONG Z Y,JI Z L,et al.Numerical simulation of precessing vortex core in cyclone separator[J].Journal of Chemical Industry,2007,58(2):383-390.
[23]YANG J X,SUN G G,GAO G Z.Effect of the inlet dimensions on the maximum-efficiency cyclone height[J].Separation and Purification Technology,2013,105(105):15-23.
[2]吴彩金,马正飞.斜切双进口旋风分离器流场及分离效率的数值模拟[J].石油炼制与化工,2011,42(12):50-55.WU C J,MA Z F.Numerical simulation of flow field and separation efficiency of tangential double inlet cyclone separator[J].Petroleum Refining and Chemical Engineering,2011,42(12):50-55.
[3]MASNADI M,GRACE J,ELYASI S,et al.Distribution of multi-phase gas-solid flow across identical parallel cyclones:modeling and experimental study[J].Separation&Purification Technology,2010,72(1):48-55.
[4]ZHOU X,CHENG L,WANG Q,et al.Non-uniform distribution of gas-solid flow through six parallel cyclones in a CFB system:An experimental study[J].Particuology,2012,10(2):30-35.
[5]陈建义,高锐,刘秀林,等.差异旋风分离器并联性能测量及流场分析[J].化工学报,2016,67(8):3287-3296.CHEN J Y,GAO R,LIU X L,et al.Parallel performance measurement and flow field analysis of differential cyclone separator[J],CIFSC Journal.2016,67(8):3287-3296.
[6]LIU F,CHEN J,ZHANG A,et al.Performance and flow behavior of four identical parallel cyclones[J].Separation&Purification Technology,2014,134:147-157.
[7]JIANG Y,QIU G,WANG H.Modelling and experimental investigation of the full-loop gas-solid flow in a circulating fluidized bed with six cyclone separators[J].Chemical Engineering Science,2014,109(16):85-97.
[8]MO X,CAI R,HUANG X,et al.The effects of wall friction and solid acceleration on the mal-distribution of gas-solid flow in double identical parallel cyclones[J].Powder Technology,2015,286(5):471-477.
[9]ZHOU X L,LE M,et al.Non-uniform distribution of gas-solid flow through six parallel cyclones in a CFB system:An experimental study[J].Particuology,2012,10(2):170-175.
[10]HAN C J,YANG X,LI Q.Analysis on flow field in a multi-tube cyclone separator at gas transmission station[J].Chinese Journal of Process Engineering,2015,15(3):368-374.
[11]ABDUL-WAHAB S A,FILAKA M F,AHMADI L,et al.Nonlinear programming optimization of series and parallel cyclone arrangement of NPK fertilizer plants[J].Powder Technology,2014,264(3):203-215.
[12]A.C.霍夫曼,L.E.斯坦因.旋风分离器-原理、设计和工程应用[M].彭维明,姬忠礼译.北京:化学工业出版社,2004.HOFFMANN A C,STEIN L E.Cyclone separator-principle,design and engineering application[M].PENG W M,JI Z L.trans.Beijing:Chemical Industry press,2004.
[13]CHUAH T G,GIMBUN J,CHOONG T S Y.A CFD study of the effect of cone dimensions on sampling aerocyclones performance and hydrodynamics[J].Powder Technology,2006,162(2):126-132.
[14]SHI L,BAYLESS D J,GREG KREMER A,et al.CFD simulation of the influence of temperature and pressure on the flow pattern in cyclones[J].Industrial&Engineering Chemistry Research,2006,45(22):7667-7672.
[15]CORTES C,GIL A.Modeling the gas and particle flow inside cyclone separators[J].Progress in Energy&Combustion Science,2007,33(5):409-452.
[16]ZHAO B,SU Y,ZHANG J.Simulation of gas flow pattern and separation efficiency in cyclone with conventional single and spiral double inlet configuration[J].Chemical Engineering Research&Design,2006,84(12):1158-1165.
[17]崔洁,陈雪莉,龚欣,等.径向入口结构的旋风分离器内三维流场的数值研究[J].高校化学工程学报,2010,24(3):388-394.CUI J,CHEN X L,GONG X,et al.Numerical study of three dimensional flow field in a cyclone with radial inlet structure[J].Journal of Chemical Engineering of Chinese Universities,2010,24(3):388-394.
[18]KUMAR V,JHA K.Numerical investigations of the cone-shaped vortex finders on the performance of cyclone separators[J].Journal of Mechanical Science and Technology,2018,32(11):5293-5303.
[19]AZADI M,,MOHEBBI A.A CFD study of the effect of cyclone size on its performance parameters[J].Journal of Hazardous Materials,2010,182(1/2/3):835.
[20]PENG W,HOFFMANN A C,Boot P J A J,et al.Flow pattern in reverse-flow centrifugal separators[J].Powder Technology,2002,127(3):212-222.
[21]高翠芝,孙国刚,董瑞倩.排气管对旋风分离器轴向速度分布形态影响的数值模拟[J].化工学报,2010,61(9):2409-2416.GAO C Z,SUN G G,DONG R Q.Numerical simulation of the influence of exhaust pipe on the axial velocity distribution of cyclone separator[J].CIESC Journal,2010,61(9):2409-2416.
[22]吴小林,熊至宜,姬忠礼,等.旋风分离器旋进涡核的数值模拟[J].化工学报,2007,58(2):383-390.WU X L,XIONG Z Y,JI Z L,et al.Numerical simulation of precessing vortex core in cyclone separator[J].Journal of Chemical Industry,2007,58(2):383-390.
[23]YANG J X,SUN G G,GAO G Z.Effect of the inlet dimensions on the maximum-efficiency cyclone height[J].Separation and Purification Technology,2013,105(105):15-23.
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