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• W4306403762 abstract "• The product inhibition is mainly responsible for the decrease of gasification rate. • The competition effect for active sites is not so significant. • Char-CO 2 gasification is unilaterally affected by the char-H 2 O gasification. • The mixed gasification rate is expressed by r mix = r H2O + 0.6382 × r CO2 . • A point-source model for char gasification is available in CFD simulations. In the fuel reactor of in-situ gasification chemical looping combustion ( i G-CLC), the solid fuel ( e.g. , coal, biomass) goes through two typical processes: devolatilization and char gasification. Then the pyrolysis and gasification products react with oxygen carrier to produce CO 2 and H 2 O ideally. The slow char gasification rate during i G-CLC is responsible for combustion efficiency. Therefore, a deeper understanding of char conversion characteristics is required to optimize i G-CLC conditions. In this paper, a particle-resolved simulation with detailed heterogeneous reactions is conducted, in which the effects of char particle size and reaction temperature on char conversion characteristics are carefully studied. To understand the competition between CO 2 gasification and H 2 O gasification, single-particle simulations are carried out under mixed and separate atmospheres. The char gasification rate in CO 2 /H 2 O mixtures ( r mix ) is lower than the sum of the char-H 2 O gasification rate ( r H2O ) and the char-CO 2 gasification rate ( r CO2 ). We find that the competition for active sites between char-H 2 O gasification and char-CO 2 gasification is not significant, while the inhibition of gasification products play an important role in char-CO 2 gasification, particularly the inhibition of CO (from char-H 2 O or char-CO 2 gasification), due to the accumulation of H 2 and CO inside the char particle. The inhibition effect is quantified via particle-resolved simulations and then a quantitative formula is attained to describe the complex relationship between H 2 O gasification and CO 2 gasification. Then the point-source model for H 2 O/CO 2 -char gasification is developed for computational fluid dynamics simulations. Straightforward cloud diagrams are presented to explore the relationship between conversion rate characteristics and physicochemical properties of char, providing useful information for the optimization of i G-CLC conditions." @default.
• W4306403762 created "2022-10-17" @default.
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• W4306403762 date "2023-02-01" @default.
• W4306403762 modified "2023-09-24" @default.
• W4306403762 title "The competition/inhibition effect of H2O/CO2-char gasification in typical in situ gasification-chemical looping combustion (iG-CLC) conditions via particle-resolved simulation" @default.
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• W4306403762 doi "https://doi.org/10.1016/j.fuel.2022.126316" @default.
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