用数值模拟方法分析混合和导流筒对搅拌槽中沉淀硫酸钡的影响

CIESC Journal

• REACTION KINETICS, CATALYSIS AND…… • 下一篇

用数值模拟方法分析混合和导流筒对搅拌槽中沉淀硫酸钡的影响

王正^a; 毛在砂^a; 杨超^a; 沈湘黔^b

^aInstitute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China ^b Changsha Research Institute of Mining and Metallurgy, Changsha 410012, China

收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2006-12-28 发布日期:2006-12-28
通讯作者: 王正

Computational fluid dynamics approach to the effect of mixing and draft tube on the precipitation of barium sulfate in a continuous stirred tank

WANG Zheng^a; MAO Zaisha^a; YANG Chao^a; SHEN Xiangqian^b

^a Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China

^bChangsha Research Institute of Mining and Metallurgy, Changsha 410012, China

Received:1900-01-01 Revised:1900-01-01 Online:2006-12-28 Published:2006-12-28
Contact: WANG Zheng

摘要/Abstract

摘要： The effect of mixing on the precipitation of barium sulfate in a continuous stirred tank is simulated numerically with different feeding location, feed concentration, impeller speed and residence time through solving the standard momentum and mass transport equations in combination with the moment equations for crystal population balance. The numerical method was validated with the literature data. The simulation results including the distribution of the local supersaturation ratio distribution in the precipitator, mean crystal size and coefficient of variation under different operating conditions compared well with experimental data in the literature. The effect of the presence of a draft tube on precipitation were also investigated, and it is suggested that the installation of a draft tube increased the mean crystal size, in general agreement with experimental work in the literature.

关键词: mixing;precipitation;stirred tank;computational fluid dynamics (CFD);numerical simulation;supersaturation

Abstract: The effect of mixing on the precipitation of barium sulfate in a continuous stirred tank is simulated numerically with different feeding location, feed concentration, impeller speed and residence time through solving the standard momentum and mass transport equations in combination with the moment equations for crystal population balance. The numerical method was validated with the literature data. The simulation results including the distribution of the local supersaturation ratio distribution in the precipitator, mean crystal size and coefficient of variation under different operating conditions compared well with experimental data in the literature. The effect of the presence of a draft tube on precipitation were also investigated, and it is suggested that the installation of a draft tube increased the mean crystal size, in general agreement with experimental work in the literature.

Key words: mixing, precipitation, stirred tank, computational fluid dynamics (CFD), numerical simulation, supersaturation

王正, 毛在砂,杨超, 沈湘黔. 用数值模拟方法分析混合和导流筒对搅拌槽中沉淀硫酸钡的影响[J]. CIESC Journal.

WANGZheng,MAOZaisha,YANGChao, SHENXiangqian. Computational fluid dynamics approach to the effect of mixing and draft tube on the precipitation of barium sulfate in a continuous stirred tank[J]. .

参考文献

1    Fitchett, D.E., Tarbell, J.M., “Effect of mixing on the precipitation of barium sulphate in an MSMPR reactor”, AIChE J., 36(4), 511—522(1990).
2    Chen, J.F., Zheng, C., Chen, G.T., “Interaction of macro- and micromixing on particle size distribution in reactive precipitation”, Chem. Eng. Sci., 51(10), 1957—1966(1996).
3    Manth, T., Mignon, D., Offermann, H., “Experimental investigation of precipitation reactions under homoge-neous mixing conditions”, Chem. Eng. Sci., 51(11),  2571—2576(1996).
4    Kim, W., Tarbell, J.M., “Micromixing effects on barium sulphate precipitation in a double-jet semi batch reactor”, Chem. Eng. Commun., 176, 89—113(1999).
5    Pagliolico, S., Marchisio, D., Barresi, A.A., “Influence of operating conditions on BaSO4 crystal size and mor-phology in a continuous Couette precipitator”, J. Therm. Anal. Cal., 56(3), 1423—1433(1999).
6    Garside, J., Tavare, N.S., “Mixing, reaction and precipi-tation: Limits of micromixing in an MSMPR crystal-lizer”, Chem. Eng. Sci., 40(8), 1485—1493(1985).
7    Pohorecky, R., Baldyga, J., “The effect of micromixing on the course of precipitation in an unpremixed feed con-tinuous tank crystallizer”, In: Proc. of 5th Eur. Conf. on Mixing (BHRA), Wurzburg, Paper 12, 105—114(1985).
8    Baldyga, J., Podgorska, W., Pohorecky, R., “Mix-ing-precipitation model with application to double feed semibatch precipitation”, Chem. Eng. Sci., 50(8), 1281—1300(1995).
9    Pohorecki, R., Baldyga, J., “The use of a new model of micro-mixing for determination of crystal size in pre-cipitation”, Chem. Eng. Sci., 38(1), 79—83(1985).
10    Pohorecki, R., Baldyga, J., “The effects of micromixing and the manner of reactor feeding on precipitation in stirred tank reactors”, Chem. Eng. Sci., 43(8), 1949—1954(1988).
11    Zauner, R., Jones, A.G., “On the Influence of mixing on crystal precipitation processes-Application of the segregated feed model”, Chem. Eng. Sci., 57(5), 821—831(2002).
12    Wei, H., Garside J., “Application of CFD modeling to precipitation systems”, Trans. IChemE, 75(A2), 219—227(1997).
13    Baldyga, J., Orciuch, W., “Closure problem for precipi-tation”, Trans. IChemE, 75(A2), 160—170(1997).
14    Vanleeuwen, M.L.J., Bruinsma, O.S.L., “Influence of mixing on the product quality in precipitation”, Chem. Eng. Sci., 51(11), 2595—2600(1996).
15    Garside, J., Wei, H., “Pumped, stirred and maybe precipi-tated: Simulation of precipitation process using CFD”, Acta Polytech. Scand. Chem. Technol., 244, 9—15(1997).
16    Jaworski, Z., Nienow, A.W., “CFD modeling of continu-ous precipitation of barium sulphate in a stirred tank”, Chem. Eng. J., 91, 167—174(2003).
17    Wei, H., “Application of computational fluid dynamics techniques to the modeling of precipitation processes”, Ph.D. Thesis, UMIST, UK (1997)
18    Gong, J.B., Wei, H.Y., Wang, J.K., Garside, J., “Simula-tion and scale-up of barium sulphate precipitation proc-ess using CFD modeling”, Chin. J. Chem. Eng., 13(2), 167—172(2005)
19    Wang, W.J., Mao, Z.S., “Numerical simulation of the whole field in a stirred tank with a Rushton turbine using the improved inner-outer iterative approaches”, Chin. J. Process Eng., 2(3), 193—198(2002). (in Chinese)
20    Wang, W.J., Mao, Z.S., “Numerical simulation of gas-liquid flow in a stirred tank with a Rushton turbine”, Chin. J. Chem. Eng., 10(4), 385—395(2002).
21    Wang, F., Wang, W.J., Mao, Z.S., “Numerical study of solid-liquid two-phase flow in stirred tanks with Rushton impeller, (Ⅰ) Formulation and simulation of flow field”, Chin. J. Chem. Eng., 12(5), 599—609(2004).
22    Randolph, A.D., Larson, M.A., Theory of Particulate Processes, 2nd Edition, Academic Press, New York (1988).
23    Sun, H.Y., Wang, W.J., Mao, Z.S., “Numerical simulation of the whole three-dimensional flow in a stirred tank with anisotropic algebraic stress model”, Chin. J. Chem. Eng., 10(1), 15—24(2002).
24    Nielsen, A.E., “Electrolyte crystal growth mechanisms”, J. Crystal Growth, 67(2), 289—310(1984).
25    Press, W., Vetterling, W., Teukolsky, S., Flannery, B., Numerical Recipes, Cambridge University Press, New York (1992).
26    van Leeuwen, M.L.J., Bruinsam, O.S.L., van Rosmalen, G.M., “Three-zone approach for precipitaion of barium sulphate”, J. Crystal Growth, 166, 1004—1008(1996).
27    O’Hern, H.A., Rush, F.E., “Effect of mixing conditions in barium sulfate precipitation”, I&EC Fundam., 2(4), 267—272(1963).
28    Tanaka, M., Izumi, T., “Application of stirred tank reac-tor equipped with draft tube to suspension polymeriza-tion of styrene”, J. Chem. Eng. Jpn., 18(4), 354—358(1984).
29    Penicot, P., Muhr, H., Plasari, E., Villermaux, J., “Influ-ence of the internal crystallizer geometry and the opera-tional conditions on the solid product quality”, Chem. Eng. Technol., 21(6), 507—514(1998).
30    Wang, Z., Mao, Z.S., Shen, X.Q., “Numerical simulation of macroscopic mixing in a Rushton impeller stirred tank”, Chin. J. Process Eng., 6(6), 857—863 (2006).

用数值模拟方法分析混合和导流筒对搅拌槽中沉淀硫酸钡的影响

Computational fluid dynamics approach to the effect of mixing and draft tube on the precipitation of barium sulfate in a continuous stirred tank

PDF (PC)

可视化

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 0

编辑推荐

Metrics

本文评价