Preprint Article Version 1 This version is not peer-reviewed

CO2 Gasification Reactivity of Chars Derived From Zhundong Coal

Version 1 : Received: 23 January 2017 / Approved: 23 January 2017 / Online: 23 January 2017 (09:27:35 CET)

How to cite: Liu, Y.; Guan, Y.; Zhang, K. CO2 Gasification Reactivity of Chars Derived From Zhundong Coal. Preprints 2017, 2017010099 (doi: 10.20944/preprints201701.0099.v1). Liu, Y.; Guan, Y.; Zhang, K. CO2 Gasification Reactivity of Chars Derived From Zhundong Coal. Preprints 2017, 2017010099 (doi: 10.20944/preprints201701.0099.v1).

Abstract

Coal gasification with carbon dioxide is a process for generating clean gaseous fuels and relieving greenhouse effect. Zhundong coal has high alkali and alkali earth metals (AAEMs) content, medium volatile and low ash in nature. Isothermal CO2 gasification of char derived from Zhundong coal (R-char) and char from acid washing R-char (AR-char) are performed in thermo-gravimetric analyzer (TGA). The effect of AAEMs is investigated on the gasification behavior in the range of temperatures 1073 K to 1273 K. The carbon conversion increases rapidly with increasing reaction temperature and CO2 concentration. R-char has high gasification rate and carbon conversion compared with AR-char. The accuracy of the free-model approach for calculating activation energy at different conversions is validated by compared with different kinetic models (volume reaction model, distributed activation energy model). Moreover, R-char gasification with CO2 shows a compensation effect as the Arrhenius parameters (EA and k0) increase or decrease simultaneously.

Subject Areas

Zhundong coal; char; CO2 gasification; alkali and alkaline earth metals

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