Abstract
A Computational Particle Fluid Dynamics (CPFD) model based on the Multiphase Particle in Cell (MP-PIC) approach is used for Shubarkol coal gasification simulation in an atmospheric circulating fluidized bed reactor. The simulation is developed on a basis of experimental data available from a biomass gasification process. The cross-section diameter of the reactor riser is 200 mm and the height is 6500 mm. The Euler-Lagrangian simulation is validated using experimental data available in the literature and also compared with an Euler-Euler simulation. The gasification reactions kinetics model is improved, and homogenous and heterogeneous chemistry are described by reduced-chemistry, with the reaction rates solved numerically using volume-averaged chemistry. The simulations reveal gas composition, temperature, and pressure interdependencies along the height of the reactor. The product gas composition compares well with the experiment and the temperature profile demonstrate good consistency with the experiment. The developed model is used for a case study of Shubarkol coal gasification in the circulating fluidized bed reactor.
Highlights
Gasification is a conversion process when solid carbonaceous fuel is combusted under oxygen deficiency conditions and process is limited to intermediate gaseous products, consisting of carbon monoxide (CO), hydrogen (H2), methane (CH4), carbon dioxide (CO2) and minor fractions of methane homologues, and tars
Gasification is considered a clean and efficient process that allows conversion of solid fuels to a synthesis gas which can be used in a wide variety of applications, such as in furnaces, boilers, turbines, internal-combustion engines
It can be converted to liquid fuels, or converted to substitute natural gas
Summary
Gasification is a conversion process when solid carbonaceous fuel is combusted under oxygen deficiency conditions and process is limited to intermediate gaseous products, consisting of carbon monoxide (CO), hydrogen (H2), methane (CH4), carbon dioxide (CO2) and minor fractions of methane homologues, and tars. Gasification is considered a clean and efficient process that allows conversion of solid fuels to a synthesis gas which can be used in a wide variety of applications, such as in furnaces, boilers, turbines, internal-combustion engines. Fluidized bed gasifiers exhibit higher efficiencies and better feedstock flexibility due to the better heat and mass transfer ability [1]. The objective of this study is to develop a comprehensive three-dimensional numerical Eulerian-Lagrangian simulation of circulating fluidized bed (CFB) riser where first biomass is gasified
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