Title: Gasification reactivity of high ash Indian coals in varying concentrations of CO₂

Authors: Sujan Saha; Gajanan Sahu; Prakash D. Chavan; Sudipta Datta

Addresses: Gasification and Liquefaction Research Group, Digwadih Campus, CSIR – Central Institute of Mining and Fuel Research (CIMFR), P.O. FRI, Dhanbad – 828108, Jharkhand, India ' Gasification and Liquefaction Research Group, Digwadih Campus, CSIR – Central Institute of Mining and Fuel Research (CIMFR), P.O. FRI, Dhanbad – 828108, Jharkhand, India ' Gasification and Liquefaction Research Group, Digwadih Campus, CSIR – Central Institute of Mining and Fuel Research (CIMFR), P.O. FRI, Dhanbad – 828108, Jharkhand, India ' Gasification and Liquefaction Research Group, Digwadih Campus, CSIR – Central Institute of Mining and Fuel Research (CIMFR), P.O. FRI, Dhanbad – 828108, Jharkhand, India

Abstract: Optimisation of coal gasification processes requires a good understanding of coal reactivity of the CO₂ and steam gasification reactions. Presently there are very few studies on gasification behaviour of high ash coals. Therefore, present paper investigates the gasification behaviour of char samples in 100, 70 and 30% concentrations of CO₂ in the temperature range of 900-1050°C using thermogravimetric analyser. Char samples were prepared from high ash Indian coals in inert atmosphere at 800, 900 and 1,000°C. Effects of coal/char properties, char preparation temperatures, char gasification temperatures and varying concentrations of CO₂ on gasification reactivity of high ash char samples have been reported. Higher pyrolysis temperature shows adverse effect on CO₂ gasification, whereas higher gasification temperature, CO₂ concentration, alkali index, surface area as well as porosity favour CO₂ gasification reactions. [Received: February 27, 2017; Accepted: December 1, 2017]

Keywords: high ash Indian coal; char gasification; gasification reactivity; varying concentrations of CO₂.

DOI: 10.1504/IJOGCT.2018.091562

International Journal of Oil, Gas and Coal Technology, 2018 Vol.18 No.1/2, pp.163 - 186

Received: 27 Feb 2017
Accepted: 01 Dec 2017
Published online: 04 May 2018 *

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