Kinetics, thermodynamics, and thermal decomposition characteristics of co-pyrolysis of municipality solid waste residue hydrochar and

Abstract

The solid residues obtained after subjecting Municipality Solid Waste Residue (MSWR) to hydrothermal treatment were blended (50:50) with the <1.5 g/cm3 density-separated fraction of discard coal. Co-pyrolysis experiments were conducted using a thermogravimetric analyser (TGA) in a temperature range of 25 °C to 900°C under N2 atmosphere. The pyrolysis tar yields at 520°C were 17.5%, 35.1% and 26.3% for the coal, MSWR and blended samples, respectively. The pyrolysis char yields were 77.0%, 56.6% and 67.55% for the coal, MSWR and blended sample, respectively at 520°C, and the rest of the distribution contributed to the gas yields. The kinetic and thermodynamic properties of the samples were investigated by TGA using four heating rates (10,20,30, and 40 °C/min). The TGA results were analysed using the model-free isoconversional Kissinger-Akahira-Sunose (KAS), Flynn-Wall-Ozawa (FWO) and Starink methods. The blended samples showed lower activation energies and higher Gibbs free energy values than coal and MSWR.