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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
Evaluation of Unburned Fuel in the Modeling of the Combustion Process in a 360 MW Coal-Fired Boiler
Submission Author:
Eduardo Dias , RS , Brazil
Co-Authors:
Eduardo Dias, Conrado Ermel, Paulo Rodolfo Buffon Ortiz, Paulo Smith Schneider
Presenter: Eduardo Dias
doi://10.26678/ABCM.ENCIT2020.CIT20-0140
Abstract
This paper explores the practical results of an integral approach model of the coal combustion process and mainly the heat transfer mechanisms to be applied to the furnace of a 360 MW thermal power plant. The model is based on Hottel’s zone method, and coal energy release is considered by taking into account its higher heating value. Aiming to bring higher detailing to this simplified model, the adoption of an unburned-fuel-fraction is also proposed. Four different unburned-fuel-fraction profiles were assessed. The model prediction for the gas temperature at the furnace exit plane deviates only 8 % to experimental data. Regarding the different unburned-fuel-fraction profile, −1.5 % relative deviation was found when comparing the model with a fixed unburned-fuel-fraction, and the model that considered a linear-descendent profile. Nonetheless, the results of different unburned-fuel-fraction profiles suggest that the model could be fitted to represent more accurately the combustion process, by adopting different profile setups.
Keywords
coal combustion, Zonal Method, Unburned-fuel, radiation
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