THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

Authors of this Paper

External Links

online first only

Design of a Fast Internal Circulating Fluidized-Bed Gasifier with a conical bed angle

ABSTRACT
The main purpose of a Fast Internal Circulating Fluidized-Bed Gasifier (FICFB) is the steam reforming of solid organic matter, like biomass, to a nearly nitrogen-free syngas. The calorific value of this syngas is approximately three times higher than the gas from common air-driven gasifiers. This article deals with a study of the particle dynamics in a 1 MWth FICFB plant and focuses on the design of the gasification reactor's geometry. Superheated steam is used for the fluidization and gasification in the reactor. The gasification of solid fuels causes an increase in the volume flow of the fluidizing gas and at the same time also a change in the fluidization regime. Approaching a turbulent fluidization regime or even fast fluidization is not desirable. However, with the proper design of reactor, i.e., an appropriately conical bed angle, suitable gasification conditions in the form of a fluidizing regime can be achieved across the entire height of the bed. For the purposes of the experimental research, a semi-industrial unit was set up. The process was designed and experimentally tested on a lab-scale, cold-flow model and scaled-up to a semi-industrial process. The guidelines for designing the geometry of the gasification reactor were set.
KEYWORDS
PAPER SUBMITTED: 2016-11-29
PAPER REVISED: 2018-03-28
PAPER ACCEPTED: 2018-05-13
PUBLISHED ONLINE: 2018-06-03
DOI REFERENCE: https://doi.org/10.2298/TSCI161129171M
REFERENCES
  1. Hofbauer, H., et. al., Six years experience with the FICFB-gasification process, 12th European conference and technology exhibition on biomass for energy, Industry and Climate Protection; Amsterdam, 2002
  2. Kaiser, S., et. al., Simulation of a highly efficient dual fluidized bed gasification process, 3rd European Congress on Chemical Engineering, Nürnberg, 2001
  3. Breault, R. W., Mathur. V. K., High velocity fluidized bed hydrodynamic modelling. 1. Fundamental studies of pressure drop, Industrial and Engineering Chemistry Research, 28 (1989), pp. 684-695
  4. Bai, D., et. al., Analysis of the overall pressure balance around a high-density circulating fluidised bed, Industrial and Engineering Chemistry Research, 36 (1997), pp. 3898-3907
  5. Kaiser, S., et. al., Hydrodynamics of a Dual Fluidized Bed Gasifier - Part II: Simulation of Solid Circulation Rate, Pressure Loop and Stability, Chemical Engineering Science, 58 (2003); pp. 4215-4223
  6. Löffler, G., et. al., Hydrodynamics of a Dual Fluidized - Bed Gasifier - Part I: Simulation of a Riser with Gas Injection and Diffuser, Chemical Engineering Science, 58 (2003), pp. 4197-4213
  7. Leckner, B., Regimes of large-scale fluidized beds for solid fuel conversion, Powder Technology, 308 (2017), pp. 362-367
  8. Rüdisüli, M., et. al., Scale-up of bubbling fluidized bed reactors - A review, Powder technology, 217 (2012), pp. 21-38
  9. Glicksman, L. R., Scaling Relationships for Fluidized Beds, Chemical engineering science, 39 (1982), pp. 1373-1384
  10. Lopez., G., et. al., Assessment of a conical spouted with an enhanced fountain bed for biomass gasification, Fuel, 203 (2017), pp. 825-831
  11. Saldarriaga, J.F., et. al., Correlations for calculating peak and spouting pressure drops in conical spouted beds of biomass, Journal of the Taiwan Institute of Chemical Engineers, 80 (2017), pp. 678-685
  12. Alia, N., et. al., An advanced evaluation of the mechanistic scale-up methodology of gas-solid spouted beds using radioactive particle tracking, Particuology, 34 (2017), pp. 48-60
  13. La Villettaa, M., et. al., Modelling approaches to biomass gasification: A review with emphasis on the stoichiometric method, Renewable and Sustainable Energy Reviews, 74 (2017), pp. 71-88
  14. Mahinpey, N., Gomez, A., Reviewofgasification fundamentalsandnew findings: Reactors, feedstock, and kinetic studies, Chemical Engineering Science, 148 (2016), pp. 14-31
  15. Gupta, S. K., et. al., Prediction of minimum fluidization velocity for fine tailing materials, Powder Technology, 196 (2009), pp. 263-271
  16. Kunii, D., Levenspiel. O., Fluidization Engineering, John Wiley & Sons inc., New York, 1969
  17. Girimonte, R., Formisani, B., The minimum bubbling velocity of fluidized beds operating at high temperature, Powder Technology, 189 (2009), pp. 74-81
  18. Foscolo, P. U., et. al., Design and cold model testing of a biomass gasifier consisting of two interconnected fluidized beds, Powder Technology, 173 (2007), pp. 179-188
  19. Kern, S., Pfeifer, C., Hofbauer, H., Gasification of wood in a dual fluidized bed gasifier: Influence of fuel feeding on process performance, Chemical Engineering Science, 90 (2013), pp. 284-298
  20. Peng, Y., Fan, L., T., Hydrodynamic characteristic of fluidization in liquid - solid tapered beds, Chemical engineering Science, 52 (1997), 14, pp. 2277-2290
  21. Kaewklum, R., Kuprianov, V., Theoretical And Experimental Study On Hydrodynamic Characteristic Of Fluidization In Air-Sand Conical Beds, Chemical Engineering Science, 63 (2008), pp. 1471-1479
  22. Jankes, G., G., et al., Biomass Gasification with CHP Production, Thermal Science, 16 (2012), 1, pp. 115-130
  23. Gomez-Barea, A., Leckner, B., Modelling of biomass gasification in fluidized bed, Progress in Energy and Combustion Science, 36 (2010), pp. 444-509
  24. Kaltschmitt, M., Hartmann, H., Hofbauer, H., Energie aus Biomasse, Springer, Berlin, Heidelberg, Germany, 2009
  25. Mele, J., et. al., A method to detect and control fully fluidized conical beds with a wide size distribution of particles in the vicinity of the minimum fluidization velocity, Thermal science, 19 (2015), pp. 267-276
  26. Nguyen, T., D., B., et al., Three-stage steady-state model for biomass gasification in a dual circulating fluidized-bed, Energy Conversion and Management, 54 (2012), pp. 100-112
  27. Miao, Q., et al., Modelling biomass gasification in circulating fluidized beds, Renewable Energy, 50 (2013), pp. 655-661
  28. K. Göransson, K., et. al., An experimental study on catalytic bed materials in a biomass dual fluidised bed gasifier, Renewable Energy, 81 (2015), pp. 251-261