Abstract
The thermogravimetric method allows to carry out measurements both in isothermal conditions for a given temperature and in non-isothermal conditions at a set heating rate. The aim of the work was to compare the process of gasification of the same coal in an atmosphere of CO2 under isothermal and non-isothermal conditions. The measurements were carried out with the use of DynTHERM Thermogravimetric analyzer by Rubotherm. Char derived from Polish bituminous coal “Janina” was used as material for gasification. In case of the isothermal method the measurements were performed at three temperatures – 850 °C, 900 °C and 950 °C, while in case of the non-isothermal method for three heating rates, i.e. 3 K/min, 5 K/min and 10 K/min. Based on the results obtained, kinetics curves of conversion degree of the gasification process were developed and kinetic parameters of the gasification reaction i.e. reaction order, activation energy and pre-exponential factor were determined. The values of the kinetic parameters obtained from measurements performed in isothermal and non-isothermal conditions were compared.
Highlights
Gasification is an ecologically friendly and efficient method of coal conversion that allows production of chemicals or substitution of liquid fuels and natural gas, as well as highefficiency electricity production [1]
The vast majority of the presented in literature research on gasification process are based on ex-situ method, i.e. previously prepared and cooled char is used in the measurements
There are differences in the reactivity of chars that were prepared in an atmosphere of argon, cooled down and gasified, and chars that were formed in a CO2 atmosphere and directly subjected to the gasification process [7]
Summary
Gasification is an ecologically friendly and efficient method of coal conversion that allows production of chemicals or substitution of liquid fuels and natural gas, as well as highefficiency electricity production [1]. The use of thermogravimetric analysis (TGA) based on the measurement of the changes in sample mass during heating allows to evaluate the reactivity and kinetics of reaction for the materials tested [3]. The thermogravimetric method enables to carry out measurements both in isothermal conditions for a given temperature and in non-isothermal conditions at a set heating rate. The vast majority of the presented in literature research on gasification process are based on ex-situ method, i.e. previously prepared and cooled char is used in the measurements. If the isothermal method is used, direct gasification is not possible
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