Combustion Characteristics of Coal Gangue under an Atmosphere of Coal Mine Methane

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• 作者：Jun Ren ; Chuanjin Xie ; Xuan Guo ; Zhifeng Qin ; Jian-Ying Lin ; Zhong Li
• 刊名：Energy & Fuels
• 出版年：2014
• 出版时间：June 19, 2014
• 年：2014
• 卷：28
• 期：6
• 页码：3688-3695
• 全文大小：393K
• 年卷期：v.28,no.6(June 19, 2014)
• ISSN：1520-5029

文摘

Combustion characteristics of coal gangue under O₂/N₂ mixtures with different O₂ concentrations and coal mine methane (CMM) conditions were investigated by using thermogravimetric analysis (TGA) and tube reactor tests. Calculation results for the combustion characteristic parameters show that ignition temperature, burnout temperature, and peak temperature increase, while the maximum and average combustion rates decrease with decreasing O₂ concentrations. The mass loss decreases and comprehensive combustion characteristic index increases slightly when CH₄ is present in the combustion atmosphere with equivalent O₂ concentration. TGA and tube reactor tests indicate that the mass loss of coal gangue is mainly attributed to the combustion of volatile matter and of fixed carbon. A temperature rise to 650 掳C markedly inhibits carbon combustion because of O₂ consumption caused by combustion of CH₄ and H₂ produced from CH₄ cracking. Kinetic parameters (apparent activation energy (E), reaction order, and frequency factor) were calculated for various atmospheres by direct linear regression of the kinetic equation from a single TGA curve. The E value of coal gangue combustion varies from 117.6 to 137.4 kJ/mol under different atmospheres, and is slightly higher in CMM than in the O₂/N₂ mixture with equivalent O₂ concentration.