Regular Article

Thermal and kinetic analysis on the co-combustion behaviors of anthracite and PVC

¹ School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, PR China
² School of Chemical Engineering, The University of Queensland, St Lucia, QLD 4072, Australia

^* e-mail: likejiang@ustb.edu.cn; li_kejiang@126.com

Received: 17 April 2018
Accepted: 28 June 2018

Abstract

The co-combustion characteristics of anthracite and PVC were investigated by thermogravimetric analysis to study its application in BF. First, the combustion characteristics were investigated. It was found the initial combustion temperature (T_i) of blends decreased with the increase of PVC ratio, while its decreasing rate reached maximum when 10% PVC. Aiming for further characterizing the combustion kinetics, ten gas-solid reaction mechanism functions were adopted for different groups. Results showed that Dimensional Diffusion Model is the best model to describe the combustion kinetics of anthracite and PVC. With this model, combustion kinetic parameters were calculated at 5 °C/min, and the E_a decreases with the addition of PVC. Kinetics compensation effect between the E_a and A was also observed. By Fourier Transform Infrared Spectroscopy (FTIR) analysis, significant differences of elements and functional groups were observed. This study provides theoretical guidance for the utilization of PVC as alternative fuels for BF ironmaking.