Abstract
Computational fluid dynamics (CFD) modeling of an entrained-flow reactor is demonstrated and compared with experimental data. The study is focused on char conversion modeling and its impact on gasification simulation results. An innovative procedure of optimizing input data to empirical char conversion kinetic-diffusion model is investigated, based on the complex carbon burnout kinetic model for oxidation (CBK/E) and gasification (CBK/G). The kinetics of the CBK/G model is determined using the data from char gasification experiments in a drop tube reactor. CFD simulations are performed for the laboratory-scale entrained-flow reactor at Brigham Young University for the bituminous coal. A substantial impact of applied kinetic parameters on the in-reactor gas composition and char conversion factor was observed. The effect was most considerable for the reduction zone, where gasification reactions dominate, although a non-negligible impact could also be observed in the flame zone. Based on the quantitative assessment of the incorporated optimization procedure, its application allowed to obtain one of the lowest errors of CO, H2, CO2, and H2O axial distribution with respect to the experimental data. The maximum errors for these species were equal to 18.48, 7.95, 10.15, and 20.22%, respectively, whereas the average errors were equal to 4.82, 5.47, 4.72, and 9.58%, respectively.
Highlights
More than 80% of the world’s energy comes from fossil fuels [1]
The results consider the optimization of kinetic parameters for the kinetic-diffusion model based on the reaction rates obtained from the carbon burnout kinetic model for oxidation (CBK/E) and carbon burnout kinetic (CBK)/G models
CBK/Eand andthe thekinetic-diffusion kinetic-diffusion model with literaturepresents the the reaction reaction rates model with literaturetaken kinetic parameters
Summary
More than 80% of the world’s energy comes from fossil fuels [1]. Coal is one of the main sources of fossil fuel energy as it generates nearly 40% of the world’s electricity [2].Coal-fired power plants were the single largest contributor to the growth in emissions observed in 2018 [3]. More than 80% of the world’s energy comes from fossil fuels [1]. Coal is one of the main sources of fossil fuel energy as it generates nearly 40% of the world’s electricity [2]. Coal-fired power plants were the single largest contributor to the growth in emissions observed in 2018 [3]. Coal-fired electricity generation made up 30% of global. This ongoing trend tremendously impacts the natural environment, climate, and human health. Specific measures are taken to promote and develop efficient technologies which can mitigate the negative impact on our planet
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