垂直栅板型除沫器的除沫性能研究
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摘要
垂直栅板型除沫器是一种新型的气液分离设备,它结构简单、制作容易、清洗方便。本文用数值模拟和模拟实验的两种方法研究了这种除沫器的除沫性能。
本文利用计算流体力学商用软件Fluent 6.0对除沫器中的气液两相流动进行了数值模拟。首先用标准k-ε模型对除沫器通道中的气相流场进行了模拟,然后用Fluent 6.0中的离散相模型模拟了气液两相流动。模拟结果表明:①随着进口气速的增大,离心运动加剧,分离效率先随出口气速的增大而增大至临界点即最大值,然后由于湍流程度的加剧,二次夹带增大,分离效率随出口气速的增大而减小;②进口气速的增大造成湍流程度的加剧,因而压降随之不断增大。
对垂直栅板型除沫器的性能进行了实验研究。实验采用喷雾来模拟工业应用中除沫器的实际工作环境,在常温常压的条件下,测定了喷嘴不同进液量下气流速度与除沫器的压降和分离效率的关系。实验结果表明:①垂直栅板型除沫器的适用进口气速范围为5m/s-15m/s,临界气速在11m/s左右。②分离效率先随出口气速的增大而增大至临界点即最大值,然后随出口气速的增大而减小;最佳工况下的分离效率达95%以上。③压降随气速的增大而增大。在适用进口气速范围内,压降在100Pa-600Pa之间。
数值模拟结果与实验结果基本吻合。误差在5%-20%的范围以内。
本文的研究结果对该类型的除沫器的设计和制造具有重要的参考价值和指导意义。
With its main virtue of high separation efficiency,simple structure, being made easily and being cleaned easily,the vertical grid blank mist eliminator is a new type liquid-gas separator .In this paper, the performance of the mist eliminator was investigated by numerical simulation and experiment.In this paper,the liquid-gas flow in mist eliminator was numerically simulated by CFD's commercial software-Fluent 6.0. First, the flow field in mist eliminator was numerically simulated with the Standard k-e Model and then the liquid-gas flow was numerically simulated using Fluent 6.0's Discrete Phase Model. The numerical simulation result showed that ① Centrifugal movement and the separation efficiency increased steadily with the gas velocity until it reached a peak value and thereafter diminished with turbulent strengthening because of further increase in gas velocity. ② Because of increasing turbulent,the energy loss increased,and the pressure drop increased with the gas velocity.The performance of the mist eliminator was investigated by experiment. Using spray to simulate the mist eliminator's actual working environment, at the condition of normal temperature and normal pressure, the relation between separation efficiency and outlet gas velocity, the relation between pressure drop and outlet gas velocity was investigated by experiment. The experimental result was basically accord with the numerical simulation result.The suiltable inlet velocity was in 5m/s—15m/s, and the limited velocity was abaut 11 m/s,the pressure drop was in 100 Pa—600 Pa.The result of the investigation will be helpful for designing and applying the vertical gridblank mist eliminator.
本文利用计算流体力学商用软件Fluent 6.0对除沫器中的气液两相流动进行了数值模拟。首先用标准k-ε模型对除沫器通道中的气相流场进行了模拟,然后用Fluent 6.0中的离散相模型模拟了气液两相流动。模拟结果表明:①随着进口气速的增大,离心运动加剧,分离效率先随出口气速的增大而增大至临界点即最大值,然后由于湍流程度的加剧,二次夹带增大,分离效率随出口气速的增大而减小;②进口气速的增大造成湍流程度的加剧,因而压降随之不断增大。
对垂直栅板型除沫器的性能进行了实验研究。实验采用喷雾来模拟工业应用中除沫器的实际工作环境,在常温常压的条件下,测定了喷嘴不同进液量下气流速度与除沫器的压降和分离效率的关系。实验结果表明:①垂直栅板型除沫器的适用进口气速范围为5m/s-15m/s,临界气速在11m/s左右。②分离效率先随出口气速的增大而增大至临界点即最大值,然后随出口气速的增大而减小;最佳工况下的分离效率达95%以上。③压降随气速的增大而增大。在适用进口气速范围内,压降在100Pa-600Pa之间。
数值模拟结果与实验结果基本吻合。误差在5%-20%的范围以内。
本文的研究结果对该类型的除沫器的设计和制造具有重要的参考价值和指导意义。
With its main virtue of high separation efficiency,simple structure, being made easily and being cleaned easily,the vertical grid blank mist eliminator is a new type liquid-gas separator .In this paper, the performance of the mist eliminator was investigated by numerical simulation and experiment.In this paper,the liquid-gas flow in mist eliminator was numerically simulated by CFD's commercial software-Fluent 6.0. First, the flow field in mist eliminator was numerically simulated with the Standard k-e Model and then the liquid-gas flow was numerically simulated using Fluent 6.0's Discrete Phase Model. The numerical simulation result showed that ① Centrifugal movement and the separation efficiency increased steadily with the gas velocity until it reached a peak value and thereafter diminished with turbulent strengthening because of further increase in gas velocity. ② Because of increasing turbulent,the energy loss increased,and the pressure drop increased with the gas velocity.The performance of the mist eliminator was investigated by experiment. Using spray to simulate the mist eliminator's actual working environment, at the condition of normal temperature and normal pressure, the relation between separation efficiency and outlet gas velocity, the relation between pressure drop and outlet gas velocity was investigated by experiment. The experimental result was basically accord with the numerical simulation result.The suiltable inlet velocity was in 5m/s—15m/s, and the limited velocity was abaut 11 m/s,the pressure drop was in 100 Pa—600 Pa.The result of the investigation will be helpful for designing and applying the vertical gridblank mist eliminator.
引文
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10. D.Feord, E.Wilcock, G.A.Davies. A stochastic model to describe the operation of knitted mesh mist eliminators, computation of separation efficiency. Chemical Engineering Research & Design, 1993, 71 (3): 282～294
11.魏伟胜,樊建华,鲍晓军等.旋流板式气液分离器的放大规律.过程工程学报,2003,3(5):390～ 395
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15.钟英杰,都晋燕,张雪梅.CFD技术及在现代工业中的应用.浙江工业大学学报,2003,31(3):284～289
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28. Furukawa. Role of inertia in the late stage of the phase separation of a fluid. Physica A: Statistical and Theoretical Physics, 1994, 204(1-4): 237
29. Ramzy E., El-Shobokshy MohammadS, Jabbar ZohairS. Abdul. Investigation on a modified louvred inertia air filter. Aerosol Science and Technology, 1992, 16(1): 21-42
30. Wang Yi, James P.W. Calculation of wave-plate demister effieiencies using numerical simulation of the flow field and droplet motion. Chemical Engineering Research & Design, Transactions of the Institute of Chemical Engineers, 1998, 76(A8): 980-985
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32.尹晔东,王运东,费维扬.计算流体力学(CFD)在化学工程中的应用.石化技术,2000,7(3):166～169
33.丁丽,王伟文,刘继泉等.直流降膜式旋风除雾器的实验研究与工业放大.青岛化工学院学报,2002,23(3):43～45
34.朗方年,陈金玉,吴建卫等.波纹板脱硫除雾器的除雾性能研究.机床与液压,2003,5:137～140
35.王绍亭,陈涛.动量、热量与质量传递.天津:天津科学技术出版社,1986
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41.王晓玲,刘春江,余国琮.计算流体力学在精馏塔板上的应用.化学工业与工程,2001,18(6): 390～4l6
42.龚光彩.CFD技术在暖通空调制冷工程中的应用.暖通空调HV&AC,1999,29(6):25～27
43.叶旭初,胡道和.CFD技术与工程应用.中国水泥,2003,2:29～32
44.毛军,熊艳,薛琳.实施计算流体力学本科教学的可行性分析.高等建筑教育,2003,12(2):46～52
45.查金荣,陈家镛.传递过程原理及应用.北京:冶金工业出版社,1997
46. Wang Yi, James P. W. Assessment of an eddy-interaction model and its refinements using predictions of droplet deposition in a wave-plate demister. Chemical Engineering Research and Design, 1999, 77(8): 692-698
47. B. J. Azzopardi, K. S. Sanaullah. Re-entrainment in wave-plate mist eliminators. Chemical Engineering Science, 2002, 57: 3557～3563
48.董谊仁,孙凤珍.塔设备除雾技术(续二).化工生产与技术,2000,7(4):3～6
49.董谊仁,孙凤珍.塔设备除雾技术(续一).化工生产与技术,2000,7(3):3～7
50.靳国辉,刘树琪.气液分离器.国外油田工程,1998,5:40～41
51.高志昌,贾贵仁,侯常仁.丝网式除雾器的性能试验.油田地面工程,1993,12(1):60～62
52.魏淑娟,宋文阁.新型捕雾器的研究及试验.国外油田工程,1995,5:34～35
53.王家荣,巴玺立,王喜红.旋流过滤分离技术用于天然气净化处理.油气田地面工程,2001,20(6):35
54.黄钰期.非结构网格差分求解方程和商用软件Fluent的应用:[硕士学位论文].浙江:浙江大学,2003
55.吴淑虹.圆形撞击式分离器的实验研究和数值模拟:[硕士学位论文].浙江:浙江大学,2004
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2.董谊仁,孙凤珍.塔设备除雾技术.化工生产与技术,2000,7(2):6～12
3. Monat Jamie P, McNulty Kenneth J, Michelson Ilya S, et al. Accurate evaluation of chevron mist eliminators. Chemical Engineering Progress, 1986 82(12): 32-39
4.曹学文,林宗虎,黄庆宣等.新型管柱式旋流气液分离器的设计与应用.油气田地面工程,2001,6:41～43
5.魏化中,郭丽华.折流板式除沫器技术分析与应用.湖南化工,1999,2:34～35
6.张淑萍.旋风分离器内气相流场的分区数值模拟:[硕士学位论文].上海:上海交通大学,2001
7.徐济鋆.沸腾传热和气液两相流.北京:原子能出版社,1993
8.F.Dubois邬华谟.计算流体力学的新进展.北京:高等教育出版社.2001
9.朗方年.脱硫除雾器的流体动力学特性研究:[硕士学位论文].江苏:江苏大学,2003
10. D.Feord, E.Wilcock, G.A.Davies. A stochastic model to describe the operation of knitted mesh mist eliminators, computation of separation efficiency. Chemical Engineering Research & Design, 1993, 71 (3): 282～294
11.魏伟胜,樊建华,鲍晓军等.旋流板式气液分离器的放大规律.过程工程学报,2003,3(5):390～ 395
12. Hisham T. El-Dessouky, Imad M.Alatiqi, Hisham M.Ettouney, et al. Performance of S.Al-Dwire mesh mist eliminator. Chemical Engineering and Processing, 2000, 39: 129～139
13.张劲松,赵勇,冯叔初.气液旋流分离技术综述.过滤与分离,2002,12:42～45
14.姚玉英.化工原理.天津:天津大学出版社,1999
15.钟英杰,都晋燕,张雪梅.CFD技术及在现代工业中的应用.浙江工业大学学报,2003,31(3):284～289
16. Fluent 6.0 help documentation. Fluent Inc
17.韩占忠,王敬,兰小平.FLUENT流体工程仿真计算实例与应用.北京:北京理工大学出版社,2004
18.魏伟胜,杨彦文,鲍晓军等.气液分离器的模拟实验.石油化工,2003,32(9):779～782
19.傅德熏,马延文.计算流体力学.北京:高等教育出版社.2002
20. Gambit 2.0 help documentation. Fluent Inc
21.刘大有.二相流体动力学.北京:高等教育出版社,1993
22.高小玲.纤维除雾器及其在化工生产中的应用.化工设备与管道,2003,2:24～28
23.周光垌,严宗毅,许世雄等.流体力学.北京:高等教育出版社,2000
24.李大明,兰明安.超滤技术在高效气液分离领域的应用.河南化工,2000,4:28～29
25.陈丽萍.立式重力气液分离器的工艺设计.天然气化工,1999,24:36～38
26.朱自强.应用计算流体力学.北京:北京航空航天大学出版社,1998
27. Markov V. A, Ershow A. I, Shishlo B. M. Calculation of inertia separator for gas(vapour)-liquid systems. Teoreticheskie Osnovy Khimicheskoi Tekhnologii, 1992, 26(6): 902-906
28. Furukawa. Role of inertia in the late stage of the phase separation of a fluid. Physica A: Statistical and Theoretical Physics, 1994, 204(1-4): 237
29. Ramzy E., El-Shobokshy MohammadS, Jabbar ZohairS. Abdul. Investigation on a modified louvred inertia air filter. Aerosol Science and Technology, 1992, 16(1): 21-42
30. Wang Yi, James P.W. Calculation of wave-plate demister effieiencies using numerical simulation of the flow field and droplet motion. Chemical Engineering Research & Design, Transactions of the Institute of Chemical Engineers, 1998, 76(A8): 980-985
31.陈俊杰,李俊宇,邵国兴.复挡除沫器分离理论与实验研究.硫酸工业,1992,5:3～18
32.尹晔东,王运东,费维扬.计算流体力学(CFD)在化学工程中的应用.石化技术,2000,7(3):166～169
33.丁丽,王伟文,刘继泉等.直流降膜式旋风除雾器的实验研究与工业放大.青岛化工学院学报,2002,23(3):43～45
34.朗方年,陈金玉,吴建卫等.波纹板脱硫除雾器的除雾性能研究.机床与液压,2003,5:137～140
35.王绍亭,陈涛.动量、热量与质量传递.天津:天津科学技术出版社,1986
36.刘辉.化工过程研究与设计的新手段.天津化工,1997,1:7～11
37. B. E. Launder, D. B. Spalding. Lectures in mathematical models of turbulence. New York: Academic Press, 1972
38.陶文铨.数值传热学.第二版.西安:西安交通大学出版社,2001
39.陶文铨.数值传热学.西安:西安交通大学出版社,1988
40.姚征,陈康民.CFD通用软件概述.上海理工大学学报,2002,24(2):137～144
41.王晓玲,刘春江,余国琮.计算流体力学在精馏塔板上的应用.化学工业与工程,2001,18(6): 390～4l6
42.龚光彩.CFD技术在暖通空调制冷工程中的应用.暖通空调HV&AC,1999,29(6):25～27
43.叶旭初,胡道和.CFD技术与工程应用.中国水泥,2003,2:29～32
44.毛军,熊艳,薛琳.实施计算流体力学本科教学的可行性分析.高等建筑教育,2003,12(2):46～52
45.查金荣,陈家镛.传递过程原理及应用.北京:冶金工业出版社,1997
46. Wang Yi, James P. W. Assessment of an eddy-interaction model and its refinements using predictions of droplet deposition in a wave-plate demister. Chemical Engineering Research and Design, 1999, 77(8): 692-698
47. B. J. Azzopardi, K. S. Sanaullah. Re-entrainment in wave-plate mist eliminators. Chemical Engineering Science, 2002, 57: 3557～3563
48.董谊仁,孙凤珍.塔设备除雾技术(续二).化工生产与技术,2000,7(4):3～6
49.董谊仁,孙凤珍.塔设备除雾技术(续一).化工生产与技术,2000,7(3):3～7
50.靳国辉,刘树琪.气液分离器.国外油田工程,1998,5:40～41
51.高志昌,贾贵仁,侯常仁.丝网式除雾器的性能试验.油田地面工程,1993,12(1):60～62
52.魏淑娟,宋文阁.新型捕雾器的研究及试验.国外油田工程,1995,5:34～35
53.王家荣,巴玺立,王喜红.旋流过滤分离技术用于天然气净化处理.油气田地面工程,2001,20(6):35
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