LDV measurements of particle velocity distribution in an annular stripper

doi:10.1016/j.cjche.2019.03.016

中国化学工程学报 ›› 2019, Vol. 27 ›› Issue (10): 2293-2303.DOI: 10.1016/j.cjche.2019.03.016

• Fluid Dynamics and Transport Phenomena • 上一篇下一篇

LDV measurements of particle velocity distribution in an annular stripper

Yongzheng Li¹, Xiaolai Zhang², Guangwei Zhai³, Haitao Zhang¹, Tao Li¹, Qiwen Sun³, Weiyong Ying¹

1 Engineering Research Center of Large Scale Reactor Engineering and Technology, Ministry of Education, State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;
2 School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China;
3 State Key Laboratory of Coal Liquefaction and Coal Chemical Technology, Shanghai 201203, China

收稿日期:2018-09-26 修回日期:2019-03-12 出版日期:2019-10-28 发布日期:2020-01-17
通讯作者: Tao Li
基金资助:
Supported by the National High-Tech R&D Program of China (2011AA05A204) and the Fundamental Research Funds for the Central Universities (222201817013).

LDV measurements of particle velocity distribution in an annular stripper

Yongzheng Li¹, Xiaolai Zhang², Guangwei Zhai³, Haitao Zhang¹, Tao Li¹, Qiwen Sun³, Weiyong Ying¹

1 Engineering Research Center of Large Scale Reactor Engineering and Technology, Ministry of Education, State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;
2 School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China;
3 State Key Laboratory of Coal Liquefaction and Coal Chemical Technology, Shanghai 201203, China

Received:2018-09-26 Revised:2019-03-12 Online:2019-10-28 Published:2020-01-17
Contact: Tao Li
Supported by:
Supported by the National High-Tech R&D Program of China (2011AA05A204) and the Fundamental Research Funds for the Central Universities (222201817013).

摘要/Abstract

摘要： Particle descent velocities in an annular stripper were measured by a laser Doppler velocimetry (LDV) system. In the radial direction, particle descent velocity was relatively constant in the mid-region of the stripper and increased towards the walls on both sides, exhibiting an anti-U-shaped distribution. Particle descent velocity in the radial mid-region increased with the increase of superficial gas velocity, and the maximum in the outer wall region increased significantly with the increase of solid mass flux. Superficial stripping gas velocity had stronger effect on particle velocity distributions near the stripper gas distributor, and such effect weakened with the increase of the distance from the distributor. Local particle velocity and its radial profiles could be adjusted by changing the superficial stripping gas velocity. Empirical formulas were established to describe the relationships between the local particle velocity and cross-sectional averaged velocity based on the effects of operating conditions and measuring positions. The result showed that the predicted data was in good agreement with the experimental value.

关键词: Annular stripper, Flow, Hydrodynamics, Particle velocity, Laser Doppler velocimeter

Abstract: Particle descent velocities in an annular stripper were measured by a laser Doppler velocimetry (LDV) system. In the radial direction, particle descent velocity was relatively constant in the mid-region of the stripper and increased towards the walls on both sides, exhibiting an anti-U-shaped distribution. Particle descent velocity in the radial mid-region increased with the increase of superficial gas velocity, and the maximum in the outer wall region increased significantly with the increase of solid mass flux. Superficial stripping gas velocity had stronger effect on particle velocity distributions near the stripper gas distributor, and such effect weakened with the increase of the distance from the distributor. Local particle velocity and its radial profiles could be adjusted by changing the superficial stripping gas velocity. Empirical formulas were established to describe the relationships between the local particle velocity and cross-sectional averaged velocity based on the effects of operating conditions and measuring positions. The result showed that the predicted data was in good agreement with the experimental value.

Key words: Annular stripper, Flow, Hydrodynamics, Particle velocity, Laser Doppler velocimeter

Yongzheng Li, Xiaolai Zhang, Guangwei Zhai, Haitao Zhang, Tao Li, Qiwen Sun, Weiyong Ying. LDV measurements of particle velocity distribution in an annular stripper[J]. 中国化学工程学报, 2019, 27(10): 2293-2303.

Yongzheng Li, Xiaolai Zhang, Guangwei Zhai, Haitao Zhang, Tao Li, Qiwen Sun, Weiyong Ying. LDV measurements of particle velocity distribution in an annular stripper[J]. Chinese Journal of Chemical Engineering, 2019, 27(10): 2293-2303.

参考文献

[1] J.W. Chen, H.C. Cao, Catalytic Cracking Technology and Engineering, China Petrocheical Press, Beijing, 2015(in Chinese).
[2] H.T. Bi, N. Ellis, I.A. Abba, J.R. Grace, A state-of-the-art review of gas-solid turbulent fluidization, Chem. Eng. Sci. 55(21) (2000) 4789-4825.
[3] Y. Cheng, C. Wu, J. Zhu, F. Wei, Y. Jin, Downer reactor:From fundamental study to industrial application, Powder Technol. 183(3) (2008) 364-384.
[4] D. Li, M.B. Ray, A.K. Ray, J. Zhu, A comparative study on hydrodynamics of circulating fluidized bed riser and downer, Powder Technol. 247(10) (2013) 235-259.
[5] C. Wang, C. Li, J. Zhu, C. Wang, S. Barghi, J. Zhu, A comparison of flow development in high density gas-solids circulating fluidized bed downer and riser reactors, AIChE J. 61(4) (2015) 1172-1183.
[6] J.X. Zhu, Z.Q. Yu, Y. Jin, J.R. Grace, A. Issangya, Cocurrent downflow circulating fluidized bed (downer) reactors-A state of the art review, Can. J. Chem. Eng. 73(5) (1995) 662-677.
[7] T. McKeen, T. Pugsley, Simulation of cold flow FCC stripper hydrodynamics at small scale using computational fluid dynamics, Int. J. Chem. React. Eng. 1(2003) A18.
[8] H. Bi, H. Cui, J. Grace, A. Kern, C.J. Lim, D. Rusnell, X. Song, C. McKnight, Flooding of gas-solids countercurrent flow in fluidized beds, Ind. Eng. Chem. Res. 43(18) (2004) 5611-5619.
[9] H.T. Bi, J.R. Grace, C.J. Lim, D. Rusnell, D. Bulbuc, C.A. McKnight, Hydrodynamics of the stripper section of fluid cokers, Can. J. Chem. Eng. 83(2) (2005) 161-168.
[10] H.P. Cui, M. Strabel, D. Rusnell, H.T. Bi, K. Mansaray, J.R. Grace, C.J. Lim, C.A. McKnight, D. Bulbuc, Gas and solids mixing in a dynamically scaled fluid coker stripper, Chem. Eng. Sci. 61(2) (2006) 388-396.
[11] J. Gao, J. Chang, X. Lan, Y. Yang, C. Lu, C. Xu, CFD modeling of mass transfer and stripping efficiency in FCCU strippers, AIChE J. 54(5) (2008) 1164-1177.
[12] H. Sun, M. Cheng, D. Chen, L. Xu, Z. Li, N. Cai, Experimental study of a carbon stripper in solid fuel chemical looping combustion, Ind. Eng. Chem. Res. 54(35) (2015) 8743-8753.
[13] H. Sun, M. Cheng, Z. Li, N. Cai, Riser-based carbon stripper for coal-fueled chemical looping combustion, Ind. Eng. Chem. Res. 55(8) (2016) 2381-2390.
[14] G.K. Veluswamy, R.K. Upadhyay, R.P. Utikar, G.M. Evans, M.O. Tade, M.E. Glenny, S. Roy, V.K. Pareek, Hydrodynamics of a fluid catalytic cracking stripper using γ-ray densitometry, Ind. Eng. Chem. Res. 50(10) (2011) 5933-5941.
[15] D. Jia, H. Zhao, A.S. Berrouk, C. Yang, H. Shan, Numerical study of counter-current gas-solid flow in FCC disengager and stripper, Can. J. Chem. Eng. 92(1) (2014) 176-188.
[16] G.K. Veluswamy, R.K. Upadhyay, R.P. Utikar, M.O. Tade, G. Evans, M.E. Glenny, S. Roy, V.K. Pareek, Hydrodynamic study of fluid catalytic cracker unit stripper, Ind. Eng. Chem. Res. 52(12) (2013) 4660-4671.
[17] J. Gao, J. Chang, C. Xu, X. Lan, Y. Yang, CFD simulation of gas solid flow in FCC strippers, Chem. Eng. Sci. 63(7) (2008) 1827-1841.
[18] Y. Liu, X. Lan, C. Xu, G. Wang, J. Gao, CFD simulation of gas and solids mixing in FCC strippers, AIChE J. 58(4) (2012) 1119-1132.
[19] D.H. Van Wagener, G.T. Rochelle, Stripper configurations for CO₂ capture by aqueous monoethanolamine, Chem. Eng. Res. Des. 89(9) (2011) 1639-1646.
[20] I. Rose, H. Cui, T. Zhang, C. McKnight, J. Grace, X. Bi, J. Lim, Towards an ultimate fluidized bed stripper, Powder Technol. 158(1) (2005) 124-132.
[21] M. Karimi, M. Hillestad, H.F. Svendsen, Capital costs and energy considerations of different alternative stripper configurations for post combustion CO₂ capture, Chem. Eng. Res. Des. 89(8) (2011) 1229-1236.
[22] Y. Zhang, C. Lu, M. Shi, Large-scale cold pilot experiment on a new annular catalyst stripper for FCC units, J. Chem. Eng. Chin. Univ. 18(3) (2004) 377-380(in chinese).
[23] H. Cui, J. Grace, C. McKnight, T. Zhang, I. Rose, X. Bi, J. Lim, D. Burgardt, Jet configuration for improved fluidized bed stripping, Chem. Eng. J. 125(1) (2006) 1-8.
[24] G. Li, D. Gao, J. Shi, A new stripping column process and optimization of its operation, Chem. Eng. Technol. 39(12) (2016) 2229-2237.
[25] J. Werther, B. Hage, C. Rudnick, A comparison of laser Doppler and single-fibre reflection probes for the measurement of the velocity of solids in a gas-solid circulating fluidized bed, Chem. Eng. Process. 35(5) (1996) 381-391.
[26] C.H. Ibsen, T. Solberg, B.H. Hjertager, F. Johnsson, Laser Doppler anemometry measurements in a circulating fluidized bed of metal particles, Exp. Thermal Fluid Sci. 26(6) (2002) 851-859.
[27] Y. Lu, D.H. Glass, W.J. Easson, An investigation of particle behavior in gas-solid horizontal pipe flow by an extended LDA technique, Fuel 88(12) (2009) 2520-2531.
[28] Z. Qian, M. Zhang, H. Yu, F. Wei, Radial profiles of particle velocity in a large scale CFB downer, Int. J. Chem. React. Eng. 2(2004) A7.
[29] Y. Wang, F. Wei,Z. Wang, Y. Jin, Y. Zhiqing, Radial profiles ofsolids concentrationand velocity in a very fine particle (36μm) riser, Powder Technol. 96(3) (1998) 262-266.
[30] F. Wei, H. Lin, Y. Cheng, Z. Wang, Y. Jin, Profiles of particle velocity and solids fraction in a high-density riser, Powder Technol. 100(2) (1998) 183-189.
[31] Y. Li, T. Li, H. Zhang, Q. Sun, W. Ying, LDV measurements of particle velocity distribution and annular film thickness in a turbulent fluidized bed, Powder Technol. 305(2017) 578-590.
[32] A. Mychkovsky, D. Rangarajan, S. Ceccio, LDV measurements and analysis of gas and particulate phase velocity profiles in a vertical jet plume in a 2D bubbling fluidized bed:Part I:A two-phase LDV measurement technique, Powder Technol. 220(4) (2012) 55-62.
[33] B. Wang, T. Li, Q.W. Sun, W.Y. Ying, D.Y. Fang, Experimental study on flow behavior in a gas-solid fluidized bed for the methanol-to-olefins process, Chem. Eng. Technol. 33(10) (2010) 1591-1600.
[34] S. Li, W. Lin, J. Yao, Modeling of the hydrodynamics of the fully developed region in a downer reactor, Powder Technol. 145(2) (2004) 73-81.
[35] B. Wu, J.X. Zhu, L. Briens, A comparison of flow dynamics and flow structure in a riser and a downer, Chem. Eng. Technol. 30(4) (2007) 448-459.
[36] M. Zhang, Z. Qian, H. Yu, F. Wei, The near wall dense ring in a large-scale down-flow circulating fluidized bed, Chem. Eng. J. 92(1) (2003) 161-167.
[37] Y. Yang, Y. Jin, Z. Yu, Z. Wang, Particle flow patterns in the riser and downer of circulating fluidized bed, Chin. J. Chem. Eng. 7(2) (1992) 164-172.
[38] W.Wang,J.Li,Simulationofgas-solidtwo-phase flowbyamulti-scaleCFDapproach-Of the EMMS model to the sub-grid level, Chem. Eng. Sci. 62(1) (2007) 208-231.
[39] N. Yang, W. Wang, W. Ge, J. Li, Analysis of flow structure and calculation of dragcoefficientforconcurrent-upgas-solidflow, Chin. J. Chem. Eng.11(1)(2003)79-84.
[40] C.S. Campbell, Rapid granular flows, Annu. Rev. Fluid Mech. 22(22) (1990) 57-90.
[41] Z. Wang, D. Bai, Y. Jin, Hydrodynamics of cocurrent downflow circulating fluidized bed (CDCFB), Powder Technol. 70(3) (1992) 271-275.
[42] M. Zhang, Z. Qian, F. Wei, Y. Jin, Study on radial solid-fraction profiles in large-scale downer reactor, J. Chem. Eng. Chin. Univ. 16(6) (2002) 621-625(in Chinese).

LDV measurements of particle velocity distribution in an annular stripper

LDV measurements of particle velocity distribution in an annular stripper

PDF (PC)

可视化

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 15

编辑推荐

Metrics

本文评价

[1]	Xuejing He, Zhenlin Li, Ji Wang, Hai Yu. Effects of tube cross-sectional shapes on flow pattern, liquid film and heat transfer of n-pentane across tube bundles[J]. 中国化学工程学报, 2023, 60(8): 16-25.
[2]	Anjun Liu, Jie Chen, Meng Guo, Chengmin Chen, Meihong Yang, Chao Yang. The internal circulations on internal mass transfer rate of a single drop in nonlinear uniaxial extensional flow[J]. 中国化学工程学报, 2023, 59(7): 51-60.
[3]	Wenshi Huang, Yang Zhang, Yuxin Wu, Jingyu Wang, Minmin Zhou. Analysis of particle dispersion in a turbulent flow considering particle rotation[J]. 中国化学工程学报, 2023, 58(6): 29-39.
[4]	Pengcheng Zou, Kai Wang. Methanolysis of amides under high-temperature and high-pressure conditions with a continuous tubular reactor[J]. 中国化学工程学报, 2023, 58(6): 170-178.
[5]	Weikai Ren, Runsong Dai, Ningde Jin. Modeling of liquid film thickness around Taylor bubbles rising in vertical stagnant and co-current slug flowing liquids[J]. 中国化学工程学报, 2023, 58(6): 179-194.
[6]	Hongwei Liang, Wenling Li, Zisheng Feng, Jianming Chen, Guangwen Chu, Yang Xiang. Numerical simulation of gas-liquid flow in the bubble column using Wray-Agarwal turbulence model coupled with population balance model[J]. 中国化学工程学报, 2023, 58(6): 205-223.
[7]	Lusheng Zhai, Bo Xu, Haiyan Xia, Ningde Jin. Simultaneous measurement of velocity profile and liquid film thickness in horizontal gas-liquid slug flow by using ultrasonic Doppler method[J]. 中国化学工程学报, 2023, 58(6): 323-340.
[8]	Xia Xiong, Zuohua Liu, Changyuan Tao, Yundong Wang, Fangqin Cheng, Hong Li. Reduced power consumption in stirred vessel with high solid loading by equipping punched baffles[J]. 中国化学工程学报, 2023, 56(4): 203-214.
[9]	Ming Chen, Huiyan Jiao, Jun Li, Zhibin Wang, Feng He, Yang Jin. Liquid–liquid two-phase flow in a wire-embedded concentric microchannel: Flow pattern and mass transfer performance[J]. 中国化学工程学报, 2023, 56(4): 281-289.
[10]	Tian Zhang, Qingshan Huang, Shujun Geng, Aqiang Chen, Yan Liu, Haidong Zhang. Impacts of solid physical properties on the performances of a slurry external airlift loop reactor integrating mixing and separation[J]. 中国化学工程学报, 2023, 55(3): 1-12.
[11]	Qi Han, Xin-Yuan Zhang, Hai-Bo Wu, Xian-Tai Zhou, Hong-Bing Ji. Different efficiency toward the biomimetic aerobic oxidation of benzyl alcohol in microchannel and bubble column reactors: Hydrodynamic characteristics and gas–liquid mass transfer[J]. 中国化学工程学报, 2023, 55(3): 84-92.
[12]	Chunxin Fan, Zini Guo, Jianhong Luo. Study on an improved rotating microchannel separator in the intensification for demulsification and separation process[J]. 中国化学工程学报, 2023, 55(3): 181-191.
[13]	Dayang Wang, Ningde Jin, Lusheng Zhai, Yingyu Ren. Quantitative research of the liquid film characteristics in upward vertical gas, oil and water flows[J]. 中国化学工程学报, 2023, 54(2): 67-79.
[14]	P.M. Patil, Bharath Goudar. Entropy generation analysis from the time-dependent quadratic combined convective flow with multiple diffusions and nonlinear thermal radiation[J]. 中国化学工程学报, 2023, 53(1): 46-55.
[15]	Chao Zhang, Youzhi Liu, Weizhou Jiao, Hongyan Shen, Xigang Yuan, Shengkun Jia. An optimization method for enhancement of gas–liquid mass transfer in a bubble column reactor based on the entropy generation extremum principle[J]. 中国化学工程学报, 2023, 53(1): 83-88.