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首页> 外文期刊>Journal of thermal analysis and calorimetry >Identification for the behavior of maximum reaction rate during the initial stage of coal char gasification
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Identification for the behavior of maximum reaction rate during the initial stage of coal char gasification

机译：Identification for the behavior of maximum reaction rate during the initial stage of coal char gasification

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Maximum reaction rate (R (max)) during the initial stage of coal char gasification with H2O or CO2 was investigated by thermogravimetric analysis (TG) experiments. Random pore model (RPM) and its extended version showed poor simulation results for gasification process when the R (max) occurred at low conversion. The experimental results showed that physical variations caused by switching gas, mineral catalysis and pore structure change were not the cause of the R (max). A method using furnace temperature control mode (FTC) to supply constant heat to sample chamber was adopted to detect the variation between blank and sample test temperatures when introducing H2O or CO2, and also to evaluate the relationship between the maximum temperature difference of blank and sample (Delta T (max)) and R (max). The results showed that the Delta T (max) and R (max) appeared at the same reaction time during the gasification process. Thermogravimetry-differential scanning calorimetry (TG-DSC) studies demonstrated that the appearance time of R (max) was correlated with the gas adsorption behavior because the peak of R (max) corresponded to the exothermic peak of adsorption. A modified kinetic model that coupled gas adsorption kinetic model with volumetric model was proposed to simulate the reaction rate profiles of YN coal char gasification with H2O or CO2 over the entire range of carbon conversion. The kinetic parameters estimated from the modified model exhibited reasonable activation energy ranges for the gasification process.

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