Date of Online Publication: 28/10/2006
Keywords: Fluidized bed, Incineration, Simulation, Dynamic, Real Time
Authors: I. Braianov, F. Marias, J.M. REneaume
Pages: 175-200
Transient simulation of fluidized bed garbage incinerators will be considered. This paper briefly presents the mathematical model used to perform the study. The strong heterogeneity of the system, which is composed of inert and reactive solids and gases, must be taken into account. Likewise, while a population balance is used to follow the conversion of incinerated waste, the gaseous system is modelled using three completely stirred reactors, one plug flow reactor and a two dimensional reactor. These five zones are coupled by relevant boundary conditions, while average techniques are used to link them to the particles of sand and waste. This mathematical formulation leads to a system of differential (ordinary and partial) and algebraic equations both of which are highly non-linear. The method of lines based on the finite volume scheme is applied to discretize the problem. Up-winded, centred, Essentially Non-Oscillatory and flux-limited schemes are considered. The resulting Differential Algebraic Equation system is solved by means of the Differential Algebraic System SoLver implementation of the Backward Differentiation Formulas method. Some results are presented and the influence of the technique of interpolation in the finite volume scheme on the solution is discussed. The number of cells, used for the discretization of the set of equations, satisfies the real-time simulation criteria.
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