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Experimental estimate of CO_2 concentration distribution in the stagnant gas layer inside the thermogravimetric analysis (TGA) crucible

机译:热重分析(TGA)坩埚内停滞气体层中CO_2浓度分布的实验估计

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摘要

The measurement of char gasification reactivity and kinetic parameters by TGA is generally complicated with mass transfer limitations. There is a reactant gas concentration gradient in the stagnant gas region between the mouth of the TGA crucible and the surface of the char bed because of gas consumption by the sample. The counter-diffusions between the reactant and product gases occur in this stagnant region. The Maxwell-Stefan equation has been used to estimate the distribution of gas concentration in the stagnant gas region. However, there is some uncertainty associated with semi-empirical gas diffusion coefficients used in the equation. In this study, we propose a new method to estimate the distribution of CO2 concentration in the stagnant gas region during CO2 gasification of coal char in TGA. The external effectiveness factors obtained in this way were in a reasonably good agreement with the value obtained by the traditional method widely used in literature.
机译:通过TGA测量焦炭气化反应性和动力学参数通常具有传质限制。由于样品消耗的气体,在TGA坩埚口和炭床表面之间的停滞气体区域中存在反应气体浓度梯度。反应物和产物气体之间的反扩散在该停滞区域中发生。 Maxwell-Stefan方程已用于估算停滞气体区域中的气体浓度分布。但是,方程中使用的半经验气体扩散系数存在一些不确定性。在这项研究中,我们提出了一种新的方法来估算TGA中煤焦的CO2气化过程中停滞气体区域中CO2浓度的分布。通过这种方式获得的外部有效性因素与通过文献广泛使用的传统方法获得的价值相当合理。

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