不同导叶结构对旋风管分离性能的影响
|
摘要
为了系统评价导向叶片结构对输气站场用旋风管分离性能的影响,计算模拟了叶片数量为3~15、叶片厚度为2~12 mm的弧形、梭形、楔形3种不同叶片形状下旋风管的分离效率和压降。结果表明:旋风管的压力和切向速度均沿轴线对称分布,中心涡核处的压力最低,而叶片出口处的切向速度最大为18 m/s;随叶片数量的增加,旋风管的分离效率和压降增大,当叶片数量大于4时分离效率的增长较缓慢,但均能除尽粒径大于4μm的颗粒,而增加一个叶片导致压降增加2 000 Pa;叶片厚度增加,分离效率和压降增大,尤其是对粒径为1.5μm的颗粒,旋风管的分离效率从2 mm的44.18%增加到12 mm的96.17%;楔形叶片旋风管的分离效率最大,可除尽粒径大于3μm的颗粒,压降也最大,比弧形叶片约增加4 500 Pa。
The separation efficiency and pressure drop of cyclone tube with different guide vane structures which number of vanes ranged from 3 to 15, thickness of vanes ranged from 2 to 12 mm, and three different shapes of guide vanes called arc-shaped, spindle-shaped and wedged-shaped have been simulated. Multiple conclusions have been received. Firstly, the pressure and tangential velocity of cyclone tube distribute symmetrically along the axial direction. The lowest pressure locates at the center vortex core area while the highest velocity is 18 m/s located at the outlet of guide vanes. Secondly, the separation efficiency and pressure drop increase with the increasing number of guide vanes. But its rising tendency of separation efficiency becomes gently when the vanes are more than 4 that all of whom can separate particles bigger than 4μm. On the other hand, one more vane means 2 000 Pa pressure drop rising. Thirdly, if the thickness of vanes increases, the separation efficiency and pressure drop grow up. Especially to the particles which diameters are around 1.5 μm, for the separation efficiency increase from 44.18%(2 mm) to 96.17%(12 mm). Fourthly, cyclone tube with wedge-shaped vanes that can separate particles bigger than 3 μm has the highest separation efficiency and pressure drop that adds up to 4 500 Pa compared to arc-shaped vanes.
The separation efficiency and pressure drop of cyclone tube with different guide vane structures which number of vanes ranged from 3 to 15, thickness of vanes ranged from 2 to 12 mm, and three different shapes of guide vanes called arc-shaped, spindle-shaped and wedged-shaped have been simulated. Multiple conclusions have been received. Firstly, the pressure and tangential velocity of cyclone tube distribute symmetrically along the axial direction. The lowest pressure locates at the center vortex core area while the highest velocity is 18 m/s located at the outlet of guide vanes. Secondly, the separation efficiency and pressure drop increase with the increasing number of guide vanes. But its rising tendency of separation efficiency becomes gently when the vanes are more than 4 that all of whom can separate particles bigger than 4μm. On the other hand, one more vane means 2 000 Pa pressure drop rising. Thirdly, if the thickness of vanes increases, the separation efficiency and pressure drop grow up. Especially to the particles which diameters are around 1.5 μm, for the separation efficiency increase from 44.18%(2 mm) to 96.17%(12 mm). Fourthly, cyclone tube with wedge-shaped vanes that can separate particles bigger than 3 μm has the highest separation efficiency and pressure drop that adds up to 4 500 Pa compared to arc-shaped vanes.
引文
[1]吴小林,熊至宜,姬忠礼.天然气净化用多管旋风分离器的分离性能[J].过程工程学报,2010,10(1):41-45.
[2]金有海,时铭显,杜美华,等.带有开孔单锥排尘结构的导叶式旋风管:中国,CN2254778[P].1997-05-28.
[3]金有海,王建军,王宏伟,等.PSC型旋风管内气相流动的实验与数值研究[J].中国石油大学学报:自然科学版,2006,30(6):71-76,82.
[4]金有海,马艳杰,许伟伟,等.排气芯管结构对导叶式旋风管内流场影响的数值模拟[J].中国石油大学学报:自然科学版,2009,33(6):87-90,99.
[5]许伟伟,金有海,王建军.分流型芯管对导叶式旋风管内颗粒逃逸的控制[J].化工学报,2010,61(1):55-59.
[6]钱付平,章名耀.不同排尘结构旋风分离器的分离特[J].燃烧科学与技术,2006,12(2):169-174.
[7]王建军,谭慧敏,许伟伟,等.不同排尘结构对导叶式旋风管内气固两相流动影响的数值研究[J].化工学报,2010,61(9):2257-2264.
[8]陈建义,罗晓兰,时铭显.PV-E型旋风分离器性能试验研究[J].流体机械,2004,32(3):1-4,43.
[9]Hoffmann A C,Groot M,Peng W,et al.Advantages and risks in increasing cyclone separator length[J].AICh E Journal,2001,47(11):2452-2460.
[10]Akiyama T,Marui T.Dust collection efficiency of a straightthrough cyclone-effects of duct length,guide vanes and nozzle angle for secondary rotational air flow[J].Powder Technology,1989,58(3):181-185.
[11]Comas M,Comas J,Chetrit C,et al.Cyclone pressure drop and efficiency with and without an inlet vane[J].Powder Technology,1992,66(2):143-148.
[12]Kim I K,Kim J S.A study on flow performance of axial inlet cyclone for dust collector[J].Key Engineering Materials,2006,326-328:1321-1324.
[13]时铭显.导向叶片式旋风子多管除尘器性能与设计的初步探讨[J].炼油设备设计,1980(1):1-15.
[14]毛羽,时铭显.导叶式旋风子叶片的设计与计算[J].华东石油学院学报,1983(3):306-318.
[15]毛羽,时铭显.导叶式旋风子叶片参数的试验研究[J].华东石油学院学报,1985(2):45-53.
[16]金向红,金有海,王振波,等.导叶角度对轴流式气液旋流器分离性能的影响[J].石油机械,2008,36(2):1-5,82.
[17]韩传军,陈飞,杨雪,等.叶片参数对导叶式旋风分离管性能的影响[J].机械设计,2015,32(8):2-7.
[18]谷瑞青,陶华东.升气管插入深度对旋风分离器流场影响的数值模拟[J].化工时刊,2013,27(4):6-8.
[2]金有海,时铭显,杜美华,等.带有开孔单锥排尘结构的导叶式旋风管:中国,CN2254778[P].1997-05-28.
[3]金有海,王建军,王宏伟,等.PSC型旋风管内气相流动的实验与数值研究[J].中国石油大学学报:自然科学版,2006,30(6):71-76,82.
[4]金有海,马艳杰,许伟伟,等.排气芯管结构对导叶式旋风管内流场影响的数值模拟[J].中国石油大学学报:自然科学版,2009,33(6):87-90,99.
[5]许伟伟,金有海,王建军.分流型芯管对导叶式旋风管内颗粒逃逸的控制[J].化工学报,2010,61(1):55-59.
[6]钱付平,章名耀.不同排尘结构旋风分离器的分离特[J].燃烧科学与技术,2006,12(2):169-174.
[7]王建军,谭慧敏,许伟伟,等.不同排尘结构对导叶式旋风管内气固两相流动影响的数值研究[J].化工学报,2010,61(9):2257-2264.
[8]陈建义,罗晓兰,时铭显.PV-E型旋风分离器性能试验研究[J].流体机械,2004,32(3):1-4,43.
[9]Hoffmann A C,Groot M,Peng W,et al.Advantages and risks in increasing cyclone separator length[J].AICh E Journal,2001,47(11):2452-2460.
[10]Akiyama T,Marui T.Dust collection efficiency of a straightthrough cyclone-effects of duct length,guide vanes and nozzle angle for secondary rotational air flow[J].Powder Technology,1989,58(3):181-185.
[11]Comas M,Comas J,Chetrit C,et al.Cyclone pressure drop and efficiency with and without an inlet vane[J].Powder Technology,1992,66(2):143-148.
[12]Kim I K,Kim J S.A study on flow performance of axial inlet cyclone for dust collector[J].Key Engineering Materials,2006,326-328:1321-1324.
[13]时铭显.导向叶片式旋风子多管除尘器性能与设计的初步探讨[J].炼油设备设计,1980(1):1-15.
[14]毛羽,时铭显.导叶式旋风子叶片的设计与计算[J].华东石油学院学报,1983(3):306-318.
[15]毛羽,时铭显.导叶式旋风子叶片参数的试验研究[J].华东石油学院学报,1985(2):45-53.
[16]金向红,金有海,王振波,等.导叶角度对轴流式气液旋流器分离性能的影响[J].石油机械,2008,36(2):1-5,82.
[17]韩传军,陈飞,杨雪,等.叶片参数对导叶式旋风分离管性能的影响[J].机械设计,2015,32(8):2-7.
[18]谷瑞青,陶华东.升气管插入深度对旋风分离器流场影响的数值模拟[J].化工时刊,2013,27(4):6-8.