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Application of Eddy Dissipation Concept for Modeling Biomass Combustion, Part 2: Gas-Phase Combustion Modeling of a Small-Scale Fixed Bed Furnace

Farokhi, Mohammadreza, Birouk, Madjid
Energy & Fuels 2016 v.30 no.12 pp. 10800-10808
air, biomass, combustion, fluid mechanics, fuels, furnaces, gas emissions, mixing, models, pollutants, prediction, temperature
Small-scale grate-firing biomass furnaces suffer from high levels of pollutant emissions caused mainly by a low level of air/fuel mixing and a short residence time for combustion as a result of their small volume. Reliable gas-phase combustion modeling is key for improving the design of these systems. The present work describes a computational fluid dynamics study of biomass combustion using the modified eddy dissipation concept (EDC) model. Part 1 (10.1021/acs.energyfuels.6b01947) of this study focused on examining the main challenges of the EDC model regarding its application for modeling weakly turbulent and slow-chemistry reacting flows. In addition, a sensitivity analysis was carried out on the constants of the model for modeling non-premixed combustion at weakly and highly turbulent reacting flow conditions. Using the conclusions of the analysis of part 1 (10.1021/acs.energyfuels.6b01947), gas-phase combustion of a small lab-scale grate-firing biomass furnace is simulated in the present paper (part 2). The results revealed that the modified EDC model produced reasonable predictions of the temperature and gas emissions.