燃料化学学报（中英文）2022，Vol.50Issue(8)：937-953,17.DOI:10.1016/S1872-5813(22)60002-1
次烟煤与半焦富氧混燃特性热重分析
Thermogravimetric analysis on the characteristics of oxy-fuel co-combustion of sub-bituminous coal and semi-coke
摘要
Abstract
The co-combustion of the low-rank coal with coal derived semi-coke is of great significance to solve the urgent problem of excessively produced semi-coke in China. In this research, the oxy-fuel co-combustion characteristics of Zhundong sub-bituminous coal with bituminous coal derived semi-coke are systematically investigated using thermogravimetric analysis. Compared with air combustion, oxy-fuel atmosphere increased the ignition and burnout temperature by 10 and 40 °C, respectively. Increasing the oxygen concentration to 30％strongly compensated for the slight reduction of the combustion parameters under oxy-fuel condition and much better co-combustion performance was obtained. Three iso-conversional methods, namely, Flynn-Wall-Ozawa (FWO), Kissinger-Akahira-Sunose (KAS) and Starink, were applied to estimate the activation energy, which can be divided into two stages during the co-combustion process. The average activation energy of sub-bituminous coal, the blend and semi-coke were 49.31, 50.82 and 59.00 kg/mol, respectively. Further, the pre-exponential factor and thermodynamic parameters of the enthalpy change, Gibbs free energy change and entropy change were calculated. Interaction indices were innovatively used for both kinetic-thermodynamic parameters and DTG values. An obvious interaction can be observed during the co-combustion process. The kinetic and thermodynamic results demonstrated that the 30％semi-coke ratio was beneficial to co-combustion. Meanwhile, X-ray fluorescence (XRF) and ash fusion analyses proved that the slagging tendency of sub-bituminous coal ash reduced by blending of semi-coke.关键词
富氧混燃/煤半焦/热重分析/动力学/热力学/灰熔融Key words
oxy-fuelco-combustion/coalsemi-coke/thermogravimetricanalysis/kinetics/thermodynamics/ashsintering分类
能源科技引用本文复制引用
李朝阳,牛胜利,韩奎华,李英杰,王永征,路春美..次烟煤与半焦富氧混燃特性热重分析[J].燃料化学学报（中英文）,2022,50(8):937-953,17.基金项目
The project was supported by the Primary Research&Development Plan of Shandong Province,China(2018GGX104027). （2018GGX104027）
