DTB结晶器的结构对流动特性的影响

摘要 DTB(Draft tube baffled)结晶器是一种连续生产蛋氨酸的结晶设备,目前少有研究关注工业级DTB结晶器的流动特性。利用计算流体力学(CFD)技术和欧拉-欧拉模型描述工业级DTB结晶器的宏观流动特性,探究增加导叶结构提高结晶器内循环的合理性,并研究导流筒长度和挡板长度对流体流动和颗粒悬浮状态的影响。模拟结果表明,增加导叶结构提高了结晶器的轴流效果;导流筒长度为2.8 m时结晶器既能保持良好的内循环效果,又不会因到达沸腾液面的流速过高导致流场不稳定;挡板长度决定沉降区的大小,太长的挡板不利于细晶消除和结晶器的稳定运行。

	Service

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	Email Alert
	RSS
	作者相关文章
	陈志荣
	相艳停
	袁慎峰
	尹红

关键词： DTB结晶器计算流体力学导叶导流筒挡板

Abstract： DTB crystallizer (draft tube baffled) can be used to produce methionine as a continuous industrial crystallization equipment. There are few studies have focused on the flow characteristics of industrial-scale DTB crystallizer at present. Computational fluid dynamics (CFD) technology and Euler-Euler model were used to describe the macroscopic flow characteristics of industrial DTB crystallizer. The rationality of increasing the guide vane to improve circulation in the crystallizer was investigated, and the effect of draft tube length and baffle length on fluid flow and particle suspension state was studied. The simulation results show that increasing the guide vane improves the axial flow effect of the crystallizer. When the draft tube length is 2.8 m, the DTB crystallizer can maintain a good internal circulation effect without unstable flow field due to high velocity reaching the boiling liquid level. The baffle length determines the size of the settling zone, and long baffle is unfavorable for eliminating fine crystals and stabilizing the operation of the crystallizer.

Keywords： DTB crystallizer computational fluid dynamics guide vane draft tube baffle

Received 2023-04-24;

Fund:中央高校基本科研业务费专项资金资助项目(226-2023-00085)。

Corresponding Authors: 尹红,教授,yinh@zju.edu.cn。 Email: yinh@zju.edu.cn

About author: 陈志荣(1963—),男,教授,主要从事应用化学与化学工程方面的研究。

引用本文:

陈志荣, 相艳停, 袁慎峰, 尹红.DTB结晶器的结构对流动特性的影响[J]. 化学工业与工程, 2025,42(2): 125-134

CHEN Zhirong, XIANG Yanting, YUAN Shenfeng, YIN Hong.Influence of DTB crystallizer structure on flow characteristics[J]. Chemcial Industry and Engineering, 2025,42(2): 125-134

[1] 谭圣君, 邵友元, 李卫. 蛋氨酸的研究现状及其应用前景[J]. 湖北工业大学学报, 2006, 21(6): 66-71 TAN Shengjun, SHAO Youyuan, LI Wei. Current research and application prospects of methionine[J]. Journal of Hubei University of Technology, 2006, 21(6): 66-71(in Chinese)
[2] 周容帆. 蛋氨酸结晶过程研究[D]. 杭州: 浙江大学, 2021 ZHOU Rongfan. Crystallization process of D, L-methionine[D].Hangzhou: Zhejiang University, 2021 (in Chinese)
[3] WANTHA L, FLOOD A E. Growth and dissolution kinetics of α and γ polymorphs of DL-methionine[J]. Journal of Crystal Growth, 2013, 362: 66-70
[4] SAWAMURA S, KUNIMASA N. High-pressure solubility of L-methionine in water[J]. Journal of Solution Chemistry, 2014, 43(9): 1810-1815
[5] PAN H, LI J, JIN Y, et al. Numerical investigation of the effect of bottom shape on the flow field and particle suspension in a DTB crystallizer[J]. International Journal of Chemical Engineering, 2016, doi:10.1155/2016/6862152
[6] SONG X, ZHANG M, WANG J, et al. Optimization design for DTB industrial crystallizer of potassium chloride[J]. Industrial & Engineering Chemistry Research, 2010, 49(21): 10297-10302
[7] SHU C, WANG X, SHA Z. CFD simulation on solid suspension with continuous operation[J]. Advanced Materials Research, 2011, 233/234/235: 1177-1183
[8] ASHRAF A B, BÖRNER M, PEGLOW M, et al. Coupled computational fluid dynamics-discrete element method simulations of a pilot-scale batch crystallizer[J]. Cryst Growth Des, 2014, 15(1): 145-155
[9] MENON A, KRAMER H, GRIEVINK J, et al. Modelling the cyclic behaviour in a DTB crystallizer—A two-population balance model approach[J]. Journal of Crystal Growth, 2004, 275(1): e1373-e1381
[10] HAMAMURA T, NAGATA H, SOTOWA K, et al. Ease of control of imperfectly mixed continuous DTB crystallizers[J]. Kagaku Kogaku Ronbunshu, 2001, 27: 359-366
[11] HOON O D, YOUNG J R, HYUNG K J, et al. Scale-up of a semi-batch draft tube baffled crystallizer for hexanitrohexaazaisowurtzitane based on experiments and computational fluid dynamics simulation[J]. Crystal Growth & Design, 2019, 19(2): 658-671
[12] OH D H, JEON R Y, ADAMS D, et al. Software platform for computation fluid dynamics simulation of mixing and crystallization in a stirred vessel[J]. Crystal Growth & Design, 2019, 20(2): 1172-1185
[13] 徐勇泳. 碳酸锂结晶器CFD数值模拟研究[D]. 上海: 华东理工大学, 2013 XU Yongyong. CFD simulation research on crystallizer of lithium carbonate[D].Shanghai: East China University of Science and Technology, 2013 (in Chinese)
[14] 汤俊杰, 易争明, 郭璐. 基于CFD对DTB结晶器内搅拌桨构型的优选[J]. 现代化工, 2019, 39(1): 209-212 TANG Junjie, YI Zhengming, GUO Lu. CFD-based optimization of configuration of agitator blade in DTB crystallizer[J]. Modern Chemical Industry, 2019, 39(1): 209-212(in Chinese)
[15] 丁绪淮, 谈遒. 工业结晶[M]. 北京: 化学工业出版社, 1985 DING Xuhuai, TAN Qiu. Industrial crystallization[M]. Beijing: Chemical Industry Press, 1985(in Chinese)
[16] 赵思源. 光卤石及氯化钾结晶设备混合与闪蒸的CFD研究[D]. 天津: 天津大学, 2018 ZHAO Siyuan. CFD study on mixing and flash evaporation of carnallite and potassium chloride crystallization equipments[D].Tianjin: Tianjin University, 2018 (in Chinese)
[17] JAWORSKI Z. The use of angle resolved LDA data to compare two different turbulence models applied to sliding mesh CFD flow simulations in a stirred tank[J]. Recent Progres en Genie des Procedes, 1997, 11: 187-194
[18] SYNOWIEC P M, MA?YSIAK A, WÓJCIK J. Fluid-dynamics scale-up problems in the DTM crystallizer[J]. Chemical Engineering Science, 2012, 77: 78-84
[19] ZHU Z, WEI H. Flow field of stirred tank used in the crystallization process of ammonium sulphate[J]. ScienceAsia, 2008, 34(1): 97-101
[20] MALIK R, SHI T, TANG Z, et al. Computational fluid dynamics (CFD) based simulated study of multi-phase fluid flow[J]. Defect and Diffusion Forum, 2010, 307: 1-11
[21] OGAWA S, UMEMURA A, OSHIMA N. On the equations of fully fluidized granular materials[J]. Zeitschrift Für Angewandte Mathematik Und Physik ZAMP, 1980, 31(4): 483-493
[22] DING J, GIDASPOW D. A bubbling fluidization model using kinetic theory of granular flow[J]. AIChE Journal, 1990, 36(4): 523-538
[23] LUN C K K, SAVAGE S B, JEFFREY D J, et al. Kinetic theories for granular flow: Inelastic particles in Couette flow and slightly inelastic particles in a general flow field[J]. Journal of Fluid Mechanics, 1984, 140: 223-256
[24] SYAMLAL M, O'BRIEN T J. Computer simulation of bubbles in a fluidized bed[J]. AIChE Symposium Series, 1989, 85(270): 22-31
[25] DALLAVALLE J M. Coagulation and sedimentation[J]. Proceedings of the American Society of Civil Engineers, 1956, 82(4): 1051-1052
[26] GARSLDE J, AL-DIBOUNI M R. Velocity-voidage relationships for fluidization and sedimentation in solid-liquid systems[J]. Industrial and Engineering Chemistry Process Design and Development, 1977, 16(2): 206-214
[27] RICHARDSON J F, ZAKI W N. Sedimentation and fluidisation: Part I[J]. Chemical Engineering Research and Design, 1997, 75(1 SUPPL.): 82-100
[28] LUO J, ISSA R I, GOSMAN A D. Prediction of impeller induced flows in mixing vessels using multiple frames of reference[J]. Institution of Chemical Engineers Symposium Series, 1994, 136: 549-556
[29] SHENG J, MENG H, FOX R. Validation of CFD simulations of a stirred tank using particle image velocimetry data[J]. Canadian Journal of Chemical Engineering, 1998, 76: 611-625