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Mathematical modelling of heat and mass transfer in a fixed biomass fuel bed. Part 3, Char Combustion

Gemechu B., Atreya A., Blasiak W.

Archives of Thermodynamics

1999

Vol. 20, no 3/4

73-88

One-dimensional propagation of a combustion front in a solid fuel bed of char is modelling by making the solid fuel as stationary with gas flowing through it upwards. The main means of heat transfer considered are conduction, convection and radiation. The fuel bed is assumed to be a porous homogenous layer composed of uniformly distributed coarse particles that are randomly oriented. The bed is thermally thick rendering a time-dependent, non-uniform temperature distribution between the top and the bottom. The mathematical model formulates the basic equations and solves them numerically to describe the temperature and species distribution in the region. Thermal non-equilibrium between the gas phase and the solid particle syrfaces is assumed, cosequently the use of separate equations for gas and solid phase equations is necessary. The method of solution is more complicated due to the fact that the partial differential equations of heat transfer are simultaneous non-linear partial differential equations. Numerical methods are used applaying Mathematica and Fortran ODE codes. Both methods show good results compared with previous works.