Modeling of heat and mass transfer during thermal decomposition of a single solid fuel particle

• Autorzy: Wardach-Święcicka I. , Kardaś D.
• Języki publikacji: EN

Abstrakty

EN

The aim of this work was to investigate the heat and mass transfer during thermal decomposition of a single solid fuel particle. The problem regards the pyrolysis process which occurs in the absence of oxygen in the first stage of fuel oxidation. Moreover, the mass transfer during heating of the solid fuels is the basic phenomenon in the pyrolysis-derived alternative fuels (gas, liquid and solid phase) and in the gasification process which is focused on the generation of syngas (gas phase) and char (solid phase). Numerical simulations concern pyrolysis process of a single solid particle which occurs as a consequence of the particle temperature increase. The research was aimed at an analysis of the influence of particle physical properties on the devolatilization process. In the mathematical modeling the fuel grain is treated as an ideal sphere which consists of porous material (solid and gaseous phase), so as to simplify the final form of the partial differential equations. Assumption that the physical properties change only in the radial direction, reduces the partial derivatives of the angular coordinates. This leads to obtaining the equations which are only the functions of the radial coordinate. The model consists of the mass, momentum and energy equations for porous spherical solid particle heated by the stream of hot gas. The mass source term was determined in the wide range of the temperature according to the experimental data. The devolatilization rate was defined by the Arrhenius formula. The results of numerical simulation show that the heating and devolatilization time strongly depend on the physical properties of fuel. Moreover, proposed model allows to determine the pyrolysis process direction, which is limited by the equilibrium state.

Słowa kluczowe

EN

fuel particles; devolatilization; pyrolysis; heat and mass transfer

PL

ziarna paliwa; odgazowanie; piroliza; wymiana ciepła i masy

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN ; Komitet Termodynamiki i Spalania PAN
• Czasopismo: Archives of Thermodynamics
• Rocznik: 2013
• Tom: Vol. 34, no. 2
• Strony: 53--71
• Opis fizyczny: Bibliogr. 20 poz., il.

Twórcy

autor

Wardach-Święcicka I.

• The Szewalski Institute of Fluid-Flow Machinery Polish Academy of Sciences, Fiszera 14, 80-231 Gdańsk, Poland

autor

Kardaś D.

• The Szewalski Institute of Fluid-Flow Machinery Polish Academy of Sciences, Fiszera 14, 80-231 Gdańsk, Poland

Bibliografia

• [1] Kurose R., Watanabe H., Makino H.: Numerical simulations of pulverized coal combustion. KONA Powder Part. J. 27(2009), 144–156.
• [2] Fu Z., Guo Z., Yuan Z., Wang Z.: Swelling and shrinkage behavior of raw and processed coals during pyrolysis. Fuel 86(2007), 418–425.
• [3] Tomeczek J.: Coal combustion. The academic scripts 1667. Silesian University of Technology, Gliwice 1992 (in Polish).
• [4] Wardach-Święcicka I., Kardaś D., Pozorski J.: Modelling of interactions between variable mass and density solid particles and swirling gas stream. J. Phys. Conf. Ser., EIOP Publishing Ltd. ETC13 318(2011), 13/11.
• [5] Tuck A.R.C., Hallet W.L.H.: Modelling of particle pyrolysis in a packed bed combustor. Tech. Rep., University of Ottawa, Ontario 2004.
• [6] Iciek J., Kamiński W., Kudra T, Markowski A.: The heat transfer calculations. The academic scripts, Technical University of Łódź, Łódź 1993 (in Polish).
• [7] Wardach-Święcicka I., Kardaś D.: Modeling of solid fuel particles combustion. Proc. Int. Symp. on Turbulence, 7th, Heat and Mass Transfer, CD, ISBN 978-1-56700-302-4, Palermo 2012.
• [8] Kardaś D.: Model of the coal and biomass pyrolysis rate in the non-equilibrium thermodynamic state. Tech. Rep. IF-FM PASci. 227/2010, Gdańsk 2010 (in Polish).
• [9] Ściążko M.: Modeling of pressure generation from the thermally plastified packed bed coal grains. Tech. Rep. IChPC, Zabrze 2005 (in Polish).
• [10] Polesek-Karczewska S.: Comparative analysis of the kinetics of gasification of different types of biomass and fossil fuels. Tech. Rep. IF-FM PASci. 141/2008, Gdańsk 2008 (in Polish).
• [11] Kardaś D., Polesek-Karczewska S.: Description and solution of one-dimensional unsteady biomass pyrolysis problem in the reactor. Tech. Rep. UWM, Olsztyn 2013 (in Polish).
• [12] ANSYS Fluent 12.0 Tutorial Guide. Updated for ANSYS Fluent 12.1, ANSYS, Inc., 2009.
• [13] Carslaw H.S., Jaeger J.C.: Conduction of heat in solids. Oxford UP, Ely House, London 1959.
• [14] Kalinowski E.: Heat transfer and heat exchangers. Oficyna Wydawnicza Politechniki Wrocławskiej, Wrocław 1995 (in Polish).
• [15] Ściążko M.: Coal classification models — thermodynamic and kinetic approach. Wydawnictwa AGH, Kraków 2010 (in Polish).
• [16] Yang Y.B., Yamauchi H., Nasserzadeh V., Swithenbank J.: Effects of fuel devolatilisation on the combustion of wood chips and incineration of simulated municipal solid wastes in a packed bed. Fuel 82(2003), 2205–2221.
• [17] Ross R.J. (Ed.): Wood Handbook, Wood as an Engineering Material. Forest Products Laboratory, United States Department of Agriculture Forest Service, Madison, Wisconsin 2010.
• [18] Heidenreich C.A., Yan H.M., Zhang D.K.: Mathematical modelling of devolatilization of large coal particles in a convective environment. Fuel 78(1999), 557–566.
• [19] Speight J.G.: Handbook of Coal Analysis. John Wiley & Sons, Inc., New Jersey 2005.
• [20] Navarro M.V., Martinez J.D., Murillo R., Garcia T., López J.M., Callén M.S., Mastral A.M.: Application of particle model to pyrolysis. Comparison of different feedstock: Plastic, tyre, coal and biomass. Fuel Process. Tech. 103(2012), 1–8.