On the modeling of oxy-coal combustion in a fluidized bed

•A model has been developed to predict oxy-coal combustion in fluidized beds.•Model comprises fluid-dynamics, coal combustion, sulfur capture and heat transfer.•Validation is accomplished for three coals, under a variety of operating conditions.•Pressure, temperature and emissions patterns are simul...

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Bibliographic Details
Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2013-07, Vol.228, p.179-191
Main Authors: Guedea, Isabel, Díez, Luis I., Pallarés, Javier, Romeo, Luis M.
Format: Article
Language:English
Subjects:
Chemical engineering
Coal
Combustion
Combustion modeling
Computational fluid dynamics
Computer simulation
Fluidized bed
Fluidized beds
Mathematical models
Oxy-fuel
Reactors
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Summary:•A model has been developed to predict oxy-coal combustion in fluidized beds.•Model comprises fluid-dynamics, coal combustion, sulfur capture and heat transfer.•Validation is accomplished for three coals, under a variety of operating conditions.•Pressure, temperature and emissions patterns are simulated. This paper addresses the modeling of oxy-coal combustion and its validation for a 90kW fluidized bed unit. The one-dimensional model is based on semi-empirical approaches, which assumptions are presented and discussed in the paper. Model predictions comprise fluid dynamics, combustion and heat transfer rates under oxy-coal combustion conditions. The model is experimentally fitted to the fired coals, and validation is accomplished by comparing simulations with experimental measurements, when firing three different coals for a wide range of O2 concentrations. Results demonstrate that the model is able to adequately simulate the phenomena occurring in the reactor, showing good agreements and well capturing all the trends observed during the experiments. The model can then be used to analyze the facility performance in a reliable and inexpensive way.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2013.04.085