为提高除渣器对造纸过程中产生的高浓重杂的去除效率,将导流叶片应用到造纸用高浓重杂除渣器结构改进上,并用ICEM软件对其模型划分混合结构网格,通过Fluent软件对其内部3%质量分数纸浆悬浮液进行数值模拟,同时分析其内部浆料运行轨迹、压力和速度分布特征。结果表明:导流叶片式锥形除渣器内部流场具有对称性,浆渣分离更加平稳; 浆料流场由除渣器内壁附近的外旋流和中心区域的内旋流组成; 在进浆速度4 m/s时,良浆出口流量为4.424 kg/s,尾渣出口流量为1.083 kg/s,纤维收集效率为80.54%,比传统除渣器提高了约10%; 同时新型除渣器内部浆料流速更快,克服了传统除渣器短路流对除渣效率的影响,除渣效率提高3%以上。
Abstract
This paper introduced a novel guide vane inlet applied in the high consistency cleaner for paper industry. The grid division was finished with ICEM and the flow field of pulp of 3% in concentration was simulated with Fluent software. Different features of the pulp trajectory, pressure and velocity in guide vane cleaner model were analyzed. Results showed that internal flow field was symmetric in the guide vane cleaner, and the cleaner could run smoothly. The flow field of pulp suspension consisted of an external vortex in the outer region and an internal vortex in the central region. In the case of inlet slurry velocity was 4 m/s, the outlet flow rate of the good pulp and the slurry were 4.424 kg/s and 1.083 kg/s, respectively, and leaded to a fiber collection efficiency reached 80.54%,improving by 10% than traditional cleaners.In addition, the novel guide cane cleaner enabled the pulp to move faster than that in the traditional cleaners. This overcoming the typical drawback of short circuit flow, which resulted in a 3% improvement in separation efficiency. The obtained results could provide a theory basis for improving the efficiency of traditional high consistency cleaner.
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] 刘向红,严晓云.锥形除渣器的设计[J].轻工机械,2008,26(3):20-23.
Liu X H, Yan X Y. Design and discussion of cone-shaped cleaners[J]. Light industry machinery,2008,26(3):20-23.
[2] 杨福成.现代除渣器的理论与实践[J].黑龙江造纸,2003,(3):8-9.
Yang F C. Theory and practice of modern cleaner[J]. Heilongjiang pulp and paper,2003,31(2):24-25.
[3] 王振波,金有海.导叶式气液旋流分离器试验研究[J].流体机械,2006,34(3):7-10.
Wang Z B, Jin Y H.Research on vane-guided cyclone for gas-liquid separation[J]. Fluid machinery, 2006,34(3):7-10.
[4] Narasimha M, Sripriya R, Banerjee P K. CFD modelling of hydrocyclone-prediction of cut size[J]. Int J miner process, 2005, 75(1-2):53-68.
[5] Dlamini M F, Powell M S, Meyer C J. A CFD simulation of a single phase hydrocyclone flow field[J]. The South African institute of mining and metallurgy, 2005, 105(10):711-717.
[6] 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, 12(3):44-57.
Mao Y, Shi M X. The design and calculation of guide vane cyclone tube[J]. Journal of east China petroleum institute, 1983, 12(3):44-57.
[7] 金有海,范超,毛羽,等.导叶式旋风管叶片参数设计方法的研究[J].化工机械,1999,26(1):21-25.
Jin Y H, Fan C, Mao Y, et al. The reseach of guide vane cyclone tube[J]. Chemical machinery,1999,26(1):21-25.
[8] 丁旭明,王振波,金有海.两种入口结构旋流器性能对比试验研究[J].化工机械, 2005,32(2):69-71.
Ding X M, Wang Z B, Jin Y H. An experimental investigation on the performance comparison of two kinds of inlets of hydrocyclones[J]. Chemical machinery, 2005,32(2):69-71.
[9] 杨福成.现代除渣器的理论与实践(续二)[J].黑龙江造纸, 2004,32(1):17-18.
Yang F C.Theory and practice of modern cleaner[J].Heilongjiang pulp and paper,2004,32(1):17-18.
[10] 张健.正向除渣器中纤维流动性与收集效率的模拟分析[J].南京林业大学学报(自然科学版),2014,38(1):130-134.
Zhang J.Simulation analysis of flow characteristics and collection efficiencies of fibers in forward cleaner[J]. Journal of Nanjing Forestry University(natural sciences edition), 2014,38(1):130-134.
[11] 张健,沙九龙,杨帅,等.正向除渣器内部纤维浆料流场的数值模拟 [J].南京林业大学学报(自然科学版),2013,37(2):141-146.
Zhang J, Sha J L, Yang S, et al.Numerical simulation of fiber slurry flow field in the internal forward cleaner[J]. Journal of Nanjing Forestry University( natural sciences edition), 2013,37(2):141-146.
[12] 于勇.FLUENT入门与进阶教程[M].北京:北京理工大学出版社,2008:9.
Yu Y. FLUENT introduction and advanced course[M]. Beijing: Beijing Institute of Technology Press, 2008: 9.
[13] 陈永利,张健,张辉.基于FLUENT的压力筛波纹形状改进机制[J].南京林业大学学报(自然科学版),2012,36(6):105-109.
Chen Y L, Zhang J, Zhang H. Improving mechanism of pressure screen contoured slot shape based on FLUENT[J]. Journal of Nanjing Forestry University(natural sciences edition), 2012,36(6):105-109.
[14] 任志安,郝点,谢红杰.几种湍流模型及其在FLUENT中的应用[J].化工装备机械,2009,30(2):38-44.
Ren Z A, Hao D, Xie H J. Turbulent model and its application to the fluent[J]. Chemical equipment machinery, 2009,30(2):38-44.
[15] Sommerfeld M,Ho C H. Numerical calculation of particle transport in turbulent wall bounded flows[J].Powder technology,2003,131:1-6.
[16] Hoekstra A J. Gas flow field and collection efficiency of cyclone separator[D]. Netherland: Delft University of Technology, 2000.
[17] Hsieh K T, Phenomenological model of the hydrocyclone[D]. Salt Lake City:The University of Utah, 1998.
[18] Ko J, Zahrai S, Macchion O. Numerical modeling of highly swirling flows in a through-flow cylindrical hydrocyclone[J]. American Institute of Chemical Engineers, 2006, 52(10):3334-3344.
[19] 韩占忠,王敬.FLUENT:流体工程仿真计算实例与应用[M].北京:北京理工大学出版社,2004:1-199.
Han Z Z, Wang J. FLUENT: fluid engineering simulation and applications[M]. Beijing: Beijing Institute of Technology Press,2004:1-199.
[20] 庞学诗.水力旋流器理论与应用[M].长沙:中南大学出版社,2005.
Pang X S. The theory and applications of hydroclone[M]. Changsha: Central South University Press,2005.
[21] 张建.正向除渣器内部浆料流场和结构优化机理的数值模拟[D]. 南京:南京林业大学,2013:26-27.
Zhang J. Simulation analysis of flow characteristics and collection efficiencies of fibers in forward cleaner[D]. Nanjing: Nanjing Forestry University, 2013:26-27.
[22] 李勇,刘志友,安亦然.介绍计算流体力学通用软件—FLUENT[J].水动力学研究与进展,2001,16(2):254-258.
Li Y, Liu Z Y, An Y R. A brief introduction to fluent-a general purpose CFD code[J].Journal of hydro dynamics, 2001,16(2):254～258.
基金
收稿日期:2014-11-27 修回日期:2015-03-17
基金项目:江苏省制浆造纸科学与技术重点实验室开放基金资助项目(201409); 江苏高校优势学科建设工程资助项目(PAPD)
第一作者:刘钰(942470089@qq.com)。*通信作者:张辉(zhnjfu@163.com),教授。
引文格式:刘钰,杨帅,张辉. 新型导流叶片式高浓锥形除渣器内部浆料流场研究[J]. 南京林业大学学报(自然科学版),2016,40(1):117-122.
PDF(3096352 KB)
