Synergistic effect, kinetic and thermodynamics parameters analyses of co-gasification of municipal solid waste and bituminous coal with CO2

Guangchao Ding; Boshu He; Huifeng Yao; Yucheng Kuang; Jingge Song; Liangbin Su

doi:10.1016/j.wasman.2020.10.028

Synergistic effect, kinetic and thermodynamics parameters analyses of co-gasification of municipal solid waste and bituminous coal with CO₂

Waste Manag. 2021 Jan 1:119:342-355. doi: 10.1016/j.wasman.2020.10.028. Epub 2020 Nov 9.

Authors

Guangchao Ding¹, Boshu He², Huifeng Yao¹, Yucheng Kuang¹, Jingge Song¹, Liangbin Su¹

Affiliations

¹ Institute of Combustion and Thermal Systems, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China.
² Institute of Combustion and Thermal Systems, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China; School of Mechanical and Power Engineering, Haibin College of Beijing Jiaotong University, Huanghua 061199, Hebei Province, China. Electronic address: hebs@bjtu.edu.cn.

PMID: 33181450
DOI: 10.1016/j.wasman.2020.10.028

Abstract

Co-gasification of municipal solid waste (MSW) with bituminous coal (BC) is an attractive alternative to realize the harmless disposal and energy harvesting of MSW. In this work, co-gasification characteristics and synergistic interaction of MSW and BC with CO₂ atmosphere are studied by thermogravimetric method, including analyses of thermodynamics, kinetic parameters and reaction mechanism function. Results indicate that MSW gasification process can be divided into four main stages, and that of BC has only three main stages. Gasification temperature of coal char is much higher than that of MSW char, and addition of MSW can significantly improve the gasification reactivity of BC. Besides, a significant synergistic effect is observed for all the blends in char gasification stage. Based on three kinetic methods of Flynn-Wall-Ozawa (Xie et al., 2018), Starink (Zhang et al., 2019a) and Friedman, the minimum average activation energy E_a (184.13 kJ/mol) is obtained when the blend ratio of BC is 40% which might be an optimal option for co-gasification of the blends. The average values of the enthalpy, the Gibbs function and the entropy changes for sample 60MSW40BC are 176.82 kJ/mol, 257.89 kJ/mol and -89.16 J/mol·K, respectively. According to the Malek method, F6, A1 and D7 models are probably more suitable to describe three main stages of sample 60MSW40BC CO₂ co-gasification.

Keywords: Co-gasification technology; Kinetic and thermodynamics; Mechanism function; Municipal solid waste (MSW); Synergistic effect.

MeSH terms

Biomass
Carbon Dioxide
Coal*
Solid Waste*
Thermodynamics

Substances

Coal
Solid Waste
Carbon Dioxide