ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Gasification kinetics of Barapukurian coal char using carbon dioxide and steam reactants

M. Shahabuddin, M. A. Kibria, and Sankar Bhattacharya

Department of Chemical Engineering, Monash University, Clayton, Australia

E-mail: sahmmad@swinburne.edu.au

Received: 21 September 2021  Accepted: 16 March 2022

Abstract:

Gasification of coal is a cost-effective and sustainable technology to produce syngas and hydrogen with integrated carbon capture and storage system. This study investigates the gasification characteristics of Barapukurian bituminous coal (BBC) char under carbon dioxide (CO₂) and steam atmosphere using a thermogravimetric analyser (TGA). The char was prepared through a rapid pyrolysis process in a high temperature entrained flow gasifier at a temperature of 1200 °C. TGA experiments were conducted under atmospheric pressure over 700–1200 °C. Factors affecting intrinsic gasification kinetics, such as diffusion and mass transfer limitations, were optimised before conducting TGA experiments at various temperatures. Three established kinetic models of the volumetric model (VM), grain model (GM) and random pore model (RPM) fitted well with the experimental data. The activation energy determined from CO₂ gasification was 1.20–1.25 times higher than that of steam gasification, indicating a higher reactivity under steam than CO₂. The order of reaction using CO₂ and steam was determined to be 0.67 and 0.95 at 900 °C.

Graphical abstract

Keywords: Gasification; Kinetics; Activation energy; CO2; Steam; TGA

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-022-02186-0

Chemical Papers 76 (7) 4459–4470 (2022)