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Influence of Solids Circulation Flux on Coal Gasification Process in a Pressurized High-density Circulating Fluidized Bed

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Abstract

The coal gasification behaviors in the pressurized high-density circulating fluidized bed under various solids circulation fluxes were studied with the CFD method, which combines the two-fluid model and coal gasification reactions represented by the chemical percolation devolatilization and the MGAS models. The numerical method was validated with two experimental cases, and detailed distributions of gas species and temperature in the riser were illustrated to understand the gasification process. To fully understand the influence of solids circulation flux on the gasification behavior, a series of cases were simulated with the solids flux varying gradually from 260 to 1010 kg/m2s, and the composition and quality of syngas were compared between various cases. The higher heating value of syngas firstly increased and then decreased with the increase of solids flux, and it reached the highest value around 480 kg/m2s. The influence of solids flux on gasification process was further analyzed through the contours of temperature, solids concentration, and gas composition in the riser.

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References

  1. Zhu J., Ma H., Liu D., Li J., Preheating characteristics of datong coal in O2/CO2 and air atmospheres. Journal of Thermal Science, 2018, 27(4): 341–348.

    Article  ADS  Google Scholar 

  2. Li T., Chaudhari K., VanEssendelft D., Turton R., Nicoletti P., Shahnam M., Guenther C., Computational fluid dynamic simulations of a pilot-scale transport coal gasifier: evaluation of reaction kinetics. Energy & Fuels, 2013, 27(12): 7896–7904.

    Article  Google Scholar 

  3. Singh R.I., Brink A., Hupa M., CFD modeling to study fluidized bed combustion and gasification. Applied Thermal Engineering, 2013, 52(2): 585–614.

    Article  Google Scholar 

  4. Zhang H., Zhang Y., Zhu Z., Lu Q., Circulating fluidized bed gasification of low rank coal: Influence of O2/C molar ratio on gasification performance and sulphur transformation. Journal of Thermal Science, 2016, 25(4): 363–371.

    Article  ADS  Google Scholar 

  5. Cai C., Wu Y., Zhang J., Yue G., Lv J., Zhang H., Effects of the secondary oxygen injection on the performance of a staged-entrained flow coal gasifier. In: Qi H., Zhao B. (eds) Cleaner Combustion and Sustainable World. ISCC 2011. Springer, Berlin, Heidelberg, 2013, pp. 731–737.

    Google Scholar 

  6. Wang S., Hydrodynamic characteristics in dense transport bed. PhD Dissertation, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing, China, 2012.

    Google Scholar 

  7. Cau G., Tola V., Pettinau A., A steady state model for predicting performance of small-scale up-draft coal gasifiers. Fuel, 2015, 152: 3–12.

    Article  Google Scholar 

  8. Yu K.S., Experimental study on coal gasification process in dual circulating fluidized beds. Doctor, Graduate University of Chinese Academy of Sciences, Beijing, China, 2012.

    Google Scholar 

  9. Li X.T., Grace J.R., Lim C.J., Watkinson A.P., Chen H.P., Kim J.R., Biomass gasification in a circulating fluidized bed. Biomass and Bioenergy, 2004, 26(2): 171–193.

    Article  Google Scholar 

  10. Zhang Y., Lei F., Wang S., Xu X., Xiao Y., A numerical study of gas–solid flow hydrodynamics in a riser under dense suspension upflow regime. Powder Technology, 2015, 280: 227–238.

    Article  Google Scholar 

  11. Shadle L.J., Monazam E.R., Swanson M.L., Coal gasification in a transport reactor. Industrial & Engineering Chemistry Research, 2001, 40(13): 2782–2792.

    Article  Google Scholar 

  12. Fang Y.T., Huang J.J., Wang Y., Zhang B.J., Experiment and mathematical modeling of a bench-scale circulating fluidized bed gasifier. Fuel Processing Technology, 2001, 69(1): 29–44.

    Article  Google Scholar 

  13. Kim Y.J., Lee J.M., Kim S.D., Modeling of coal gasification in an internally circulating fluidized bed reactor with draught tube. Fuel, 2000, 79(1): 69–77.

    Article  Google Scholar 

  14. Bi D., Guan Q., Xuan W., Zhang J. Numerical simulation of GSP gasifier under different swirl angles. Fuel, 2015, 155: 155–163.

    Article  Google Scholar 

  15. Adamczyk W.P., Kozolub P., Wecel G., Klimanek A., Bialecki R.A., Czakiert T., Modeling oxy-fuel combustion in a 3D circulating fluidized bed using the hybrid Euler–Lagrange approach. Applied Thermal Engineering, 2014, 71(1): 266–275.

    Article  Google Scholar 

  16. Zhou H.S., Flamant G., Gauthier D., Lu J.D., Lagrangian approach for simulating the gas-particle flow structure in a circulating fluidized bed riser. International Journal of Multiphase Flow, 2002, 28(11): 1801–1821.

    Article  MATH  Google Scholar 

  17. Chu K.W., Yu A.B., Numerical simulation of complex particle–fluid flows. Powder Technology, 2008, 179(3): 104–114.

    Article  Google Scholar 

  18. Zhang Y., Ma Q., Xu X., Xiao Y., Lei F., Numerical study of gas–solid flow behavior in a two-stage high-density riser using EMMS-based drag model. Chemical Engineering and Processing: Process Intensification, 2015, 98: 71–85.

    Article  Google Scholar 

  19. Yang N., Wang W., Ge W., Li J., CFD simulation of concurrent-up gas–solid flow in circulating fluidized beds with structure-dependent drag coefficient. Chemical Engineering Journal, 2003, 96(1–3): 71–80.

    Article  Google Scholar 

  20. Lu X., Wang T., Water–gas shift modeling in coal gasification in an entrained-flow gasifier. Part 1: Development of methodology and model calibration. Fuel, 2013, 108: 629–638.

    Article  Google Scholar 

  21. Wang S., Lu H., Liu G., Sheng Z., Xu P., Gidaspow D., Modeling of cluster structure-dependent drag with Eulerian approach for circulating fluidized beds. Powder Technology, 2011, 208(1): 98–110.

    Article  Google Scholar 

  22. Li T., Dietiker J.-F., Shadle L., Comparison of full-loop and riser-only simulations for a pilot-scale circulating fluidized bed riser. Chemical Engineering Science, 2014, 120: 10–21.

    Article  Google Scholar 

  23. Wang X.Y., Jiang F., Xu X., Fan B.G., Lei J., Xiao Y.H., Experiment and CFD simulation of gas–solid flow in the riser of dense fluidized bed at high gas velocity. Powder Technology, 2010, 199(3): 203–212.

    Article  Google Scholar 

  24. Zhang Y., Lei F., Xiao Y., The influence of pressure and temperature on gas-solid hydrodynamics for Geldart B particles in a high-density CFB riser. Powder Technology, 2018, 327: 17–28.

    Article  Google Scholar 

  25. Yu L., Lu J., Zhang X., Zhang S., Numerical simulation of the bubbling fluidized bed coal gasification by the kinetic theory of granular flow (KTGF). Fuel, 2007, 86(5–6): 722–734.

    Article  Google Scholar 

  26. Wang X., Jin B., Zhong W., Three-dimensional simulation of fluidized bed coal gasification. Chemical Engineering and Processing: Process Intensification, 2009, 48(2): 695–705.

    Article  Google Scholar 

  27. Armstrong L.M., Gu S., Luo K.H., Effects of limestone calcination on the gasification processes in a BFB coal gasifier. Chemical Engineering Journal, 2011, 168(2): 848–860.

    Article  Google Scholar 

  28. Armstrong L.M., Gu S., Luo K.H., Parametric study of gasification processes in a BFB coal gasifier. Industrial & Engineering Chemistry Research, 2011, 50(10): 5959–5974.

    Article  Google Scholar 

  29. Zhang Y., Lei F., Xiao Y., Computational fluid dynamics simulation and parametric study of coal gasification in a circulating fluidized bed reactor. Asia-Pacific Journal of Chemical Engineering, 2015, 10(2): 307–317.

    Article  Google Scholar 

  30. Xiao Y., Wang S., Yang S., Zhao K., Zeng X., Xu X., Solids acceleration length in a cold dense transport bed. Journal of Thermal Science, 2012, 21(6): 533–538.

    Article  ADS  Google Scholar 

  31. Wang C., Zhu J., Barghi S., Li C., Axial and radial development of solids holdup in a high flux/density gas–solids circulating fluidized bed. Chemical Engineering Science, 2014, 108: 233–243.

    Article  Google Scholar 

  32. Wang C., Zhu J., Li C., Barghi S., Detailed measurements of particle velocity and solids flux in a high density circulating fluidized bed riser. Chemical Engineering Science, 2014, 114: 9–20.

    Article  Google Scholar 

  33. Chang J., Zhang K., Zhu W., Yang Y., Gas–solid flow in a high-density circulating fluidized bed riser with Geldart group B particles. Particuology, 2016, 29: 103–109.

    Article  Google Scholar 

  34. Gunn D., Transfer of heat or mass to particles in fixed and fluidised beds. International Journal of. Heat and Mass Transfer, 1978, 21: 467–476.

    Article  Google Scholar 

  35. Syamlal M., Bisset L., METC gasifier advanced simulation (MGAS) model. Morgantown Energy Technology Center: Morgantown, WV, 1992. DOI: 10.2172/10127635

    Google Scholar 

  36. Grant D.M., Pugmire R.J., Fletcher T.H., Kerstein A.R., Chemical model of coal devolatilization using percolation lattice statistics. Energy & Fuels, 1989, 3(2): 175–186.

    Article  Google Scholar 

  37. Guenther C., Shahnam M., Syamlal M., Longanbach J., Cicero D., Smith P., CFD modeling of a transport gasifier. Proceedings of the 19th Annual Pittsburgh Coal Conference. Pittsburgh, Pennsylvania, 2002, pp. 24–26.

    Google Scholar 

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Acknowledgements

The authors gratefully acknowledge the financial support from National Science and Technology Major Project (No. 2015ZX07202-013) and National Natural Science Foundation of China (No. 91541123).

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Authors and Affiliations

  1. Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China

    Yawen Zhang

  2. Key Laboratory of Advanced Energy and Power, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing, 100190, China

    Yawen Zhang, Fulin Lei & Yunhan Xiao

  3. University of Chinese Academy of Sciences, Beijing, 100049, China

    Yawen Zhang, Fulin Lei & Yunhan Xiao

Authors
  1. Yawen Zhang
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  2. Fulin Lei
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  3. Yunhan Xiao
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Correspondence to Fulin Lei.

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Zhang, Y., Lei, F. & Xiao, Y. Influence of Solids Circulation Flux on Coal Gasification Process in a Pressurized High-density Circulating Fluidized Bed. J. Therm. Sci. 28, 97–105 (2019). https://doi.org/10.1007/s11630-018-1059-3

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  • DOI: https://doi.org/10.1007/s11630-018-1059-3

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