CFD MODELING OF VORTEX AFTERBURNING OF BIOMASS GASIFICATION PRODUCTS IN A FLUIDIZED BED FURNACE


  • S Kobzar Institute of Engineering Thermophysics, NAS of Ukraine
  • I Borisov Institute of Engineering Thermophysics, NAS of Ukraine
  • A. Khalatov Institute of Engineering Thermophysics of NAS of Ukraine
  • A. Teplitski A.V.Luikov Heat and Mass Transfer Institute
  • Y. Pitsukha A.V.Luikov Heat and Mass Transfer Institute
Keywords: fluidized bed furnace, biomassа; vortex afterburning, turbulent mixing, ecological characteristics.

Abstract

CFD modeling of the afterburning of biomass gasification products in a fluidized bed furnace with a vortex supply of secondary air has been carried out. The effect of secondary air heating on the ecological characteristics of flue gases has been determined. Modeling has shown that gasification products swirl in the primary chamber with the formation of a central vortex, which obeys the law of solid-body rotation. An increase in the temperature of the secondary air leads to an increase in its tangential velocity and, as a consequence, to an increase in centrifugal mass forces. Calculations have shown that with an increase in the secondary air temperature, the maximum of the kinetic energy of turbulence shifts to the periphery and increases in absolute value. This results in more efficient mixing of the central (producer gas) and peripheral (secondary air) streams. As a result, this leads to a more complete combustion. The influence of secondary air heating on the ecological characteristics of the furnace has been determined. As a result of air heating from 30° C to 300° C, the concentration of carbon monoxide decreases by more than 1.5 times. The concentration of nitrogen oxides practically does not change and amounts to 3.5 mg /nm3.

References

1. Zuberbuhler U., Baumbach G. Low NOX furnace engineering for residual and used wood combustion for the improvement of particle burn-out and efficiency in industrial // Biomass for energy and industry. Proc. Of the 10th European Conf. C.A.R.M.E.N. Publisher, 1998, pp.1389-1392.
2. Tejerot I., Trujillot A., Leon E.H. An efficient technology for the combustion of biomass // Proc. Of 1st World Conference on biomass for energy and industry, June 2000, Sevilla, Spain, Vol. II, James&James Ltd. (ed), London, UK, pp. 886-889.
3. Gaegauf C.K., Wieser U. Biomass burner with low emission of particulates // Biomass for energy and industry. Proc. Of the 10th European Conf. C.A.R.M.E.N. Publisher, 1998, pp.1509-1512.
4. Khalatov A, Borisov I, Kobzar S, Kovalenko G, Khlebnikov O (2007) Investigations of Institute for Engineering Thermophysics (Thermogasdynamics Department) in the area of combustion and gasification of alternative fuels, In: Syred N., Khalatov A. (eds) Advanced Combustion and Aerothermal Technologies. NATO Science for Peace and Security Series C: Environmental Security (2007) 231-245.Springer, Dordrecht. ISBN 978-1-4020-6513-2. doi.org/10.1007/978-1-4020-6515-6_18.
5. PitsukhaYa. A.Scientific basis for creation highly-efficient cyclone-bed furnaces for boilers using solid biofuel: Doctor of tech. Sci. Thesis: 05.14.04, The A.V. Luikov Heat and Mass Transfer Institute, Minsk, 2019, 46 pс.
6. Кобзар С.Г., Коваленко Г.В., Халатов А.А. The computer simulation of the combustion of the gasification products in fluidized bed of solid fuel in upper bed layer wit vortex burning // Thermophysics and Thermal Power Engineering. 2021, V..43, No 2 P.77–83.
DOI https://doi.org/10.31472/ttpe.2.2021.9
7. Basu P. Biomass gasification and pyrolysis: Practical design and theory. Elsevier, 2010. 364 p.

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Published
2021-12-20
How to Cite
Kobzar, S., Borisov, I., Khalatov, A., Teplitski, A., & Pitsukha, Y. (2021). CFD MODELING OF VORTEX AFTERBURNING OF BIOMASS GASIFICATION PRODUCTS IN A FLUIDIZED BED FURNACE. Thermophysics and Thermal Power Engineering, 43(4), 83-91. https://doi.org/https://doi.org/10.31472/ttpe.4.2021.10
Section
Fuel Utilization and Burning, Heat Power Units, Ecology