Abstract
In this paper, we developed a method for determining the kinetic constants of partially diffusion-controlled heterogeneous reactions in a porous sample of powder. Studies have been conducted on the experimental data of thermogravimetric analysis of carbon conversion in a stream of CO2, using a new method of processing kinetic curves, to obtain updated values of the kinetic constants under conditions where widely used models are inappropriate. Data obtained can be used for a reliable assessment of the characteristics of the gasification process.
Highlights
Gasification methods allows the processing of various solid fuels, ranging from peat brown coal and ending with coal and anthracite, in a wide range of chemical composition and other properties
When studying the conversion of solid fuels, many authors estimate the kinetic characteristics using incorrectly averaged data that leads to unreliable estimate of the kinetic characteristics of the heterogeneous reactions
The selected method allows to take into account pore diffusion effects
Summary
Gasification methods allows the processing of various solid fuels, ranging from peat brown coal and ending with coal and anthracite, in a wide range of chemical composition and other properties. Irfan et al presented an overview of coal gasification in the presence of CO2 as a reagent They considered various factors of coal gasification with CO2, including: pressure, temperature, gas composition, catalysts and minerals, heating rate, particle size, and various types of reactors. Researchers develop various catalysts or add a certain amount of mineral substances to coal samples in order to influence the reaction rate at lower temperature ranges. The results of their research [4] show that comprehensive description of heterogeneous reaction C + CO2 is possible on the basis of studying the behavior of surface oxides, which can react in different ways; the true reaction rate does not depend on the partial pressure of CO2 and the degree of conversion. When studying the conversion of solid fuels, many authors estimate the kinetic characteristics using incorrectly averaged data that leads to unreliable estimate of the kinetic characteristics of the heterogeneous reactions. We are trying to reduce transfer effects when studying the C + CO2 reaction
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