Multi-fluid Eulerian simulation of binary particles mixing and gas-solids contacting in high solids-flux downer reactor equipped with a lateral particle feeding nozzle

doi:10.1016/j.cjche.2021.03.009

中国化学工程学报 ›› 2021, Vol. 35 ›› Issue (7): 152-162.DOI: 10.1016/j.cjche.2021.03.009

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

Multi-fluid Eulerian simulation of binary particles mixing and gas-solids contacting in high solids-flux downer reactor equipped with a lateral particle feeding nozzle

Qiang Zheng¹, Jingxuan Yang¹, Wenhao Lian², Baoping Zhang¹, Xueer Pan¹, Zhonglin Zhang¹, Xiaogang Hao¹, Guoqing Guan³

1. School of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2. School of Chemical Engineering and Technology, North University of China, Taiyuan 030051, China;
3. Laboratory of Energy Conversion Engineering, Institute of Regional Innovation (IRI), Hirosaki University, 2-1-3 Matsubara, Aomori 030-0813, Japan

收稿日期:2020-11-03 修回日期:2021-03-08 出版日期:2021-07-28 发布日期:2021-09-30
通讯作者: Jingxuan Yang, Xiaogang Hao, Guoqing Guan
基金资助:
This work was supported by the National Natural Science Foundation of China (U1710101). The authors also thank Mr. Junwu Wang for his help in establishment of the multi-fluid Eulerian model.

Multi-fluid Eulerian simulation of binary particles mixing and gas-solids contacting in high solids-flux downer reactor equipped with a lateral particle feeding nozzle

Qiang Zheng¹, Jingxuan Yang¹, Wenhao Lian², Baoping Zhang¹, Xueer Pan¹, Zhonglin Zhang¹, Xiaogang Hao¹, Guoqing Guan³

1. School of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2. School of Chemical Engineering and Technology, North University of China, Taiyuan 030051, China;
3. Laboratory of Energy Conversion Engineering, Institute of Regional Innovation (IRI), Hirosaki University, 2-1-3 Matsubara, Aomori 030-0813, Japan

Received:2020-11-03 Revised:2021-03-08 Online:2021-07-28 Published:2021-09-30
Contact: Jingxuan Yang, Xiaogang Hao, Guoqing Guan
Supported by:
This work was supported by the National Natural Science Foundation of China (U1710101). The authors also thank Mr. Junwu Wang for his help in establishment of the multi-fluid Eulerian model.

摘要/Abstract

摘要： The performance of binary particles mixing and gas-solids contacting, which is considered qualitatively to have a significant influence on the heat transfer in internal heated circulating fluidized beds, is carefully investigated by means of a numerical approach in the newly developed high solids-flux downer lignite pyrolyzer (φ0.1 m×6.5 m). Since binary particles are used in this system, a reasonably validated 3D, transient, multi-fluid model, in which three heat transfer modes relating to the convection, conduction and radiation are considered, is adopted to simulate the flow behavior, temperature profiles as well as volatile contents. The simulation results showed that the solids stream impinges the left wall surface initially and turns towards the right wall in the further downward direction and then shrinks during this process resulting in that the solids concentrate a little more at the central region. In the further downward section of the downer, the particle flow disperses near the right wall and develops uniformly. Meanwhile, the coal phase is slowly heated in the downer and it is found that most of the heat absorbed by the coal is from the convection heat transfer mode. To explore the heat transfer mechanism more quantitatively, two indexes (mixing index and contacting index) are proposed, and it is found that the mixing index initially increased fast and later remained at a relatively flat state. For the contact index, it shows a trend with a first rising and then falling, finally rising continuously. Also, it is found that the convection heat transfer is closely correlated to the contacting status of gas-coal which indicates that the improving of the gas-coal contacting efficiency should be an effective way to strengthen the coal particle heating process.

关键词: CFD, Multiphase flow, Downer reactor, Numerical simulation, Heat transfer

Abstract: The performance of binary particles mixing and gas-solids contacting, which is considered qualitatively to have a significant influence on the heat transfer in internal heated circulating fluidized beds, is carefully investigated by means of a numerical approach in the newly developed high solids-flux downer lignite pyrolyzer (φ0.1 m×6.5 m). Since binary particles are used in this system, a reasonably validated 3D, transient, multi-fluid model, in which three heat transfer modes relating to the convection, conduction and radiation are considered, is adopted to simulate the flow behavior, temperature profiles as well as volatile contents. The simulation results showed that the solids stream impinges the left wall surface initially and turns towards the right wall in the further downward direction and then shrinks during this process resulting in that the solids concentrate a little more at the central region. In the further downward section of the downer, the particle flow disperses near the right wall and develops uniformly. Meanwhile, the coal phase is slowly heated in the downer and it is found that most of the heat absorbed by the coal is from the convection heat transfer mode. To explore the heat transfer mechanism more quantitatively, two indexes (mixing index and contacting index) are proposed, and it is found that the mixing index initially increased fast and later remained at a relatively flat state. For the contact index, it shows a trend with a first rising and then falling, finally rising continuously. Also, it is found that the convection heat transfer is closely correlated to the contacting status of gas-coal which indicates that the improving of the gas-coal contacting efficiency should be an effective way to strengthen the coal particle heating process.

Key words: CFD, Multiphase flow, Downer reactor, Numerical simulation, Heat transfer

Qiang Zheng, Jingxuan Yang, Wenhao Lian, Baoping Zhang, Xueer Pan, Zhonglin Zhang, Xiaogang Hao, Guoqing Guan. Multi-fluid Eulerian simulation of binary particles mixing and gas-solids contacting in high solids-flux downer reactor equipped with a lateral particle feeding nozzle[J]. 中国化学工程学报, 2021, 35(7): 152-162.

参考文献

[1] G.Q. Guan, Clean coal technologies in Japan:A review, Chin. J. Chem. Eng. 25(6) (2017) 689-697.
[2] M. Kawabata, O. Kurata, N. Iki, H. Furutani, A. Tsutsumi, Advanced integrated gasification combined cycle (A-IGCC) by exergy recuperation-Technical challenges for future generations, J. Power Technol. 92(2012) 90-100.
[3] C. Fushimi, G.Q. Guan, Advanced integrated coal gasification combined cycle:Current status of development, Encyclopediaof Sustainable Technologies, Elsevier, Amsterdam, 2017.
[4] C. Fushimi, W.N. Dewi, Energy efficiency and capital cost estimation of superheated steam drying processes combined with integrated coal gasification combined cycle, J. Chem. Eng. Jpn. 48(10) (2015) 872-880.
[5] R. Hoya, C. Fushimi, Thermal efficiency of advanced integrated coal gasification combined cycle power generation systems with low-temperature gasifier, gas cleaning and CO₂ capturing units, Fuel Process. Technol. 164(2017) 80-91.
[6] W.H. Lian, J.X. Yang, P. Li, J.L. Wang, Z.L. Zhang, C. Fushimi, X.G. Hao, W. Huang, G.Q. Guan, Numerical simulation of hydrodynamic behaviors in a novel gas-solids conical downer, Powder Technol. 336(2018) 573-583.
[7] Z.K. Zhao, J.X. Yang, W. Zhang, P. Li, W.H. Lian, Z.L. Zhang, Y.M. Huang, X.G. Hao, C. Fushimi, G.Q. Guan, Hydrodynamic simulation and optimization of the feeding system of a bubbling fluidized-bed gasifier in a triple-bed circulating fluidized bed with high solids flux, Powder Technol. 321(2017) 336-346.
[8] C. Fushimi, G.Q. Guan, M. Ishizuka, Y. Nakamura, A. Tsutsumi, Y. Suzuki, E. Wee, C. Lim, Y. Cheng, C.H. Wang, High-flux triple bed circulating fluidized bed (TBCFB) gasifier for exergy recuperative IGCC/IGFC, in:Proceedings of the 10th Intenational Conference on Circulating Fluidized Beds and Fluidization Technology (CFB-10), Bend, USA, 2011.
[9] G.Q. Guan, C. Fushimi, A. Tsutsumi, M. Ishizuka, S. Matsuda, H. Hatano, Y. Suzuki, High-density circulating fluidized bed gasifier for advanced IGCC/IGFCAdvantages and challenges, Particuology 8(6) (2010) 602-606.
[10] G.Q. Guan, C. Fushimi, M. Ishizuka, Y. Nakamura, A. Tsutsumi, S. Matsuda, Y. Suzuki, H. Hatano, Y.P. Cheng, E. Wee, C. Lim, C.H. Wang, Flow behaviors in the downer of a large-scale triple-bed combined circulating fluidized bed system with high solids mass fluxes, Chem. Eng. Sci. 66(18) (2011) 4212-4220.
[11] A. Tsutsumi, G.Q. Guan, C. Fushimi, Flow behaviors in a high solid flux circulating fluidized bed composed of a riser, a downer and a bubbling fluidized bed, in:Proceedings of the Fluidization XIII, Gyeong-ju, Korea, (2010) 407-414.
[12] C.G. Zhou, C. Rosén, K. Engvall, Fragmentation of dolomite bed material at elevated temperature in the presence of H₂O&CO₂:Implications for fluidized bed gasification, Fuel 260(2020) 116340.
[13] J.G. Meng, X.B. Wang, Z.L. Zhao, A.Q. Zheng, Z. Huang, G.Q. Wei, K. Lv, H.B. Li, Highly abrasion resistant thermally fused olivine as in situ catalysts for tar reduction in a circulating fluidized bed biomass gasifier, Bioresour. Technol. 268(2018) 212-220.
[14] Y.G. Wang, J.L. Sun, H.Y. Zhang, Z.D. Chen, X.C. Lin, S. Zhang, W.B. Gong, M.H. Fan, In situ catalyzing gas conversion using char as a catalyst/support during brown coal gasification, Energy Fuels 29(3) (2015) 1590-1596.
[15] J.Z. Han, X.D. Wang, J.R. Yue, S.Q. Gao, G.W. Xu, Catalytic upgrading of coal pyrolysis tar over char-based catalysts, Fuel Process. Technol. 122(2014) 98-106.
[16] Z. Abu El-Rub, E.A. Bramer, G. Brem, Experimental comparison of biomass chars with other catalysts for tar reduction, Fuel 87(10-11) (2008) 2243-2252.
[17] T. Sueyasu, T. Oike, A. Mori, S. Kudo, K. Norinaga, J.I. Hayashi, Simultaneous steam reforming of tar and steam gasification of char from the pyrolysis of potassium-loaded woody biomass, Energy Fuels 26(1) (2012) 199-208.
[18] X.H. Li, J.S. Ma, L.L. Li, B.F. Li, J. Feng, W. Turmel, W.Y. Li, Semi-coke as solid heat carrier for low-temperature coal tar upgrading, Fuel Process. Technol. 143(2016) 79-85.
[19] X.H. Li, B.F. Li, D.Q. Fu, J. Feng, W.Y. Li, The interaction between the char solid heat carrier and the volatiles during low-rank coal pyrolysis, J. Anal. Appl. Pyrolysis 136(2018) 160-168.
[20] Y.X. Wang, J.X. Yang, Z.L. Zhang, X.L. Ma, P. Li, X.G. Hao, G.Q. Guan, TBCFB system simulation and optimization for pyrolysis-gasification combustion of low rank coal, CIESC J. 69(8) (2018) 3596-3604. (in Chinese)
[21] B. Lv, Z.F. Luo, B. Zhang, X.Z. Qin, Particle mixing and separation performance of gas-solid separation fluidized beds containing binary mixtures, Fuel 226(2018) 462-471.
[22] H.L. Lu, Y.H. Zhao, J.M. Ding, D. Gidaspow, W. Li, Investigation of mixing/segregation of mixture particles in gas-solid fluidized beds, Chem. Eng. Sci. 62(1-2) (2007) 301-317.
[23] C. Fushimi, G.Q. Guan, Y. Nakamura, M. Ishizuka, A. Tsutsumi, Y. Suzuki, Y.P. Cheng, E.W.C. Lim, C.H. Wang, Mixing behaviors of cold-hot particles in the downer of a triple-bed combined circulating fluidized bed, Powder Technol. 221(2012) 70-79.
[24] Y.P. Cheng, W.B. Zhang, G.Q. Guan, C. Fushimi, A. Tsutsumi, C.H. Wang, Numerical studies of solid-solid mixing behaviors in a downer reactor for coal pyrolysis, Powder Technol. 253(2014) 722-732.
[25] Q. Geng, X.L. Zhu, Y.X. Liu, Y.B. Liu, C.Y. Li, X.H. You, Gas-solid flow behavior and contact efficiency in a circulating-turbulent fluidized bed, Powder Technol. 245(2013) 134-145.
[26] Z. Shu, C.G. Fan, S.G. Li, J.W. Wang, Multifluid modeling of coal pyrolysis in a downer reactor, Ind. Eng. Chem. Res. 55(9) (2016) 2634-2645.
[27] B.A. Adesanya, H.N. Pham, Mathematical modelling of devolatilization of large coal particles in a convective environment, Fuel 74(6) (1995) 896-902.
[28] J.L. Wang, P. Li, L.T. Liang, J.X. Yang, X.G. Hao, G.Q. Guan, W. Huang, Kinetics modeling of low-rank coal pyrolysis based on a three-Gaussian distributed activation energy model (DAEM) reaction model, Energy Fuels 30(11) (2016) 9693-9702.
[29] W.H. Lian, J.L. Wang, G.J. Wang, D.Y. Gao, X. Li, Z.L. Zhang, W. Huang, X.G. Hao, B.L. Hou, Investigation on the lignite pyrolysis reaction kinetics based on the general Arrhenius formula, Fuel 268(2020) 117364.
[30] Z. Shu, J.W. Wang, C.G. Fan, S.G. Li, Multifluid modeling of mixing and segregation of binary gas-solid flow in a downer reactor for coal pyrolysis, Ind. Eng. Chem. Res. 53(23) (2014) 9915-9924.
[31] Z. Shu, J.W. Wang, Q. Zhou, C.G. Fan, S.G. Li, Evaluation of multifluid model for heat transfer behavior of binary gas-solid flow in a downer reactor, Powder Technol. 281(2015) 34-48.
[32] D.F. Pan, X. Qu, J.C. Bi, Effect of gasified semi-coke on coal pyrolysis in the polygeneration of CFB gasification combined with coal pyrolysis, J. Anal. Appl. Pyrolysis 127(2017) 461-467.
[33] H.L. Lu, D. Gidaspow, E. Manger, Kinetic theory of fluidized binary granular mixtures, Phys. Rev. E 64(6) (2001) 061301.
[34] H.A. Jakobsen, Multiphase Reactive Flows, second ed. in:Chemical Reactor Modeling, Springer, New York, 2014.
[35] Z.X. Chao, Y.F. Wang, J.P. Jakobsen, M. Fernandino, H.A. Jakobsen, Derivation and validation of a binary multi-fluid Eulerian model for fluidized beds, Chem. Eng. Sci. 66(16) (2011) 3605-3616.
[36] Z.X. Chao, Y.F. Wang, J.P. Jakobsen, M. Fernandino, H.A. Jakobsen, Investigation of the particle-particle drag in a dense binary fluidized bed, Powder Technol. 224(2012) 311-322.
[37] G. Peng, P.F. Dong, Z.J. Li, J.W. Wang, W.G. Lin, Eulerian simulation of gas-solid flow in a countercurrent downer, Chem. Eng. J. 230(2013) 406-414.
[38] J. Chang, S.Q. Yang, K. Zhang, A particle-to-particle heat transfer model for dense gas-solid fluidized bed of binary mixture, Chem. Eng. Res. Des. 89(7) (2011) 894-903.
[39] J. Sun, M.M. Chen, A theoretical analysis of heat transfer due to particle impact, Int. J. Heat Mass Transf. 31(5) (1988) 969-975.
[40] F.J. Wang, S. Zhang, Z.D. Chen, C. Liu, Y.G. Wang, Tar reforming using char as catalyst during pyrolysis and gasification of Shengli brown coal, J. Anal. Appl. Pyrolysis 105(2014) 269-275.
[41] K. Mahalatkar, J. Kuhlman, E.D. Huckaby, T. O'Brien, CFD simulation of a chemical-looping fuel reactor utilizing solid fuel, Chem. Eng. Sci. 66(16) (2011) 3617-3627.
[42] J. Xie, W.Q. Zhong, Y.J. Shao, K.X. Li, Coupling of CFD-DEM and reaction model for 3D fluidized beds, Powder Technol. 353(2019) 72-83.
[43] E.H. Liu, X. Liu, M.J. Zhao, H.T. Zheng, J.H. Lu, Z.H. Zhang, Turbulent fuel-air mixing study of jet in crossflow at different velocity ratios using LES, Int. J. Heat Fluid Flow 85(2020) 108633.
[44] L.Y. Zhu, Y.P. Fan, C.X. Lu, Mixing of cold and hot particles in a pre-lifting scheme with two strands of catalyst inlets for FCC riser, Powder Technol. 268(2014) 126-138.
[45] M.F. Zhou, H. Jiang, Y.J. Hu, Z.M. Lu, H.B. Jiang, C.Z. Li, Evaluation of mixing performance for the industrial-scale radial multiple jets-in-crossflow mixing structure, Chem. Eng. Process.-Process. Intensif. 141(2019) 107534.
[46] L.P. Wei, G.D. Jiang, H.P. Teng, J. Hu, J.B. Zhu, Multi-fluid Eulerian simulation of mixing of binary particles in a gas-solid fluidized bed with a cohesive particle-particle drag model, Particuology 49(2020) 95-104.
[47] R.J. Liu, Z.Y. Zhou, R. Xiao, A.B. Yu, CFD-DEM modelling of mixing of granular materials in multiple jets fluidized beds, Powder Technol. 361(2020) 315-325.
[48] J.X. Zhu, Y. Ma, H. Zhang, Gas-solids contact efficiency in the entrance region of a co-current downflow fluidized bed (downer), Chem. Eng. Res. Des. 77(2) (1999) 151-158.
[49] C.X. Wang, J. Zhu, Developments in the understanding of gas-solid contact efficiency in the circulating fluidized bed riser reactor:A review, Chin. J. Chem. Eng. 24(1) (2016) 53-62.

Multi-fluid Eulerian simulation of binary particles mixing and gas-solids contacting in high solids-flux downer reactor equipped with a lateral particle feeding nozzle

Multi-fluid Eulerian simulation of binary particles mixing and gas-solids contacting in high solids-flux downer reactor equipped with a lateral particle feeding nozzle

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