C o m b u s t i o n M o d e l For Staged Circulating FluidizedBed Boiler* F a n g J i a n h u a L u Q i n g g a n g W a n g B o P a n Z h o n g g a n g W a n g D a s a n I n s t i t u t e of Engineering T h e r m o p h y s i c s , Chinese A c a d e m y of Sciences, P.O. Box 2706, Beijing 100080, C h i n a A mathematical model for atmospheric staged circulating fiuidized bed combustion, which takes fluid dynamics, combustion, heat transfer, pollutants formation and retention, into account was developed in the Institute of Engineering Thermophysics (IET) recently. The model of gas solid flow at the bottom of the combustor was treated by the two-phase theory of fluidized bed and in the upper region as a core-annulus flow structure. The chemical species CO, CO2, H2, H20, CH4, 02 and N2 were considered in the reaction process. The mathematical model consisted of sub-models of fluid namics, coal heterogeneous and gas homogeneous chemical reactions, heat transfer, particle fragmentation and attrition, mass and energy balance etc. The developed code was applied to simulate an operating staged circulating fluidized bed combustion boiler of early design and the results were in good agreement with the operating data. The main submodels and simulation results are given in this paper.Numerical simulation of circulating fluidized bed combustion (CFBC) is one of the important methods for the optimization of design and operation and the performance prediction of circulating fluidized bed boiler. Research efforts have made much progress in modelling CFB fluid dynamics, heat transfer and combustion in the past decades. Due to the complexity of gas solids flow behaviors in CFB combustor, most of the models are steady one-dimensional. Weiss et al. (1987)[ 11 developed a CFBC cell model. It divides the CFB system into a series of blocks each acting as a CSTR for both gas and solids. Lee and Hyppanen (1989) [21 proposed a model in which gas and solids move along the riser as plug flow. The model embodies the sigmoid concept of Kwauk's model [3]. Kunni and Levenspiel (1990) [4] developed a model to represent the complex phenomena occurring in the fast bed.
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