Title: Thermal and kinetic characteristics of the catalytic effect of different catalysts on the combustion of coal-char blends

Authors: Yingjie Hu; Zhiqiang Wang; Xingxing Cheng; Chunyuan Ma

Addresses: National Engineering Laboratory for Coal-fired Pollutants Emission Reduction, Department of Energy and Power Engineering, Shandong University, 17923 Jingshi Road, Jinan, 250061, China ' National Engineering Laboratory for Coal-fired Pollutants Emission Reduction, Department of Energy and Power Engineering, Shandong University, 17923 Jingshi Road, Jinan, 250061, China ' National Engineering Laboratory for Coal-fired Pollutants Emission Reduction, Department of Energy and Power Engineering, Shandong University, 17923 Jingshi Road, Jinan, 250061, China ' National Engineering Laboratory for Coal-fired Pollutants Emission Reduction, Department of Energy and Power Engineering, Shandong University, 17923 Jingshi Road, Jinan, 250061, China

Abstract: Thermal and kinetic characteristics of the catalytic effect of CaO/MnO2/Fe2O3 on the combustion of coal-char blends were investigated with thermogravimetric analysis. Different characteristic parameters obtained from TG-DTG curves were used to determine the combustion characteristic of samples. A sectioning method was adopted to study the kinetics at the stage I and II of samples combustion. The kinetic parameters of samples were also determined according to the Coats-Redfern method. The experimental results indicated that, in stage I, the catalysts promoted volatile matter release and combustion decreased the ignition temperature; in stage II, the catalysts accelerated the combustion of fixed carbon in char. The ignition properties and the combustion properties all increased with catalysts addition. Fe2O3 and CaO exhibited effective catalytic effect on reducing the activation energy in the stage I and II of coal-char blends combustion. The catalytic effect of MnO2 in the stage II was not obvious. Therefore, Fe2O3 and CaO were considered having more catalytically active than MnO2 in coal-char blends combustion. [Received: May 30, 2018; Accepted: December 17, 2018]

Keywords: coal-char blends; catalysts; kinetics; combustion; thermal analysis; ignition properties; combustion properties.

DOI: 10.1504/IJOGCT.2020.108855

International Journal of Oil, Gas and Coal Technology, 2020 Vol.25 No.1, pp.89 - 102

Received: 30 May 2018
Accepted: 17 Dec 2018

Published online: 24 Apr 2020 *

Full-text access for editors Access for subscribers Purchase this article Comment on this article