Thermogravimetric Analysis of Huadian Oil Shale Combustion at Different Oxygen Concentrations

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• 作者：Fengtian Bai ; Youhong Sun ; Yumin Liu
• 刊名：Energy & Fuels
• 出版年：2016
• 出版时间：June 16, 2016
• 年：2016
• 卷：30
• 期：6
• 页码：4450-4456
• 全文大小：429K
• 年卷期：0
• ISSN：1520-5029

文摘

As the simplest conversion route, combustion is extensively applied to oil shale utilization. To improve oil shale conversion techniques, we used non-isothermal thermogravimetric analysis to explore the combustion reactivity and kinetics of Huadian oil shale at various oxygen concentrations (10, 20, 30, 50, 65, and 80 vol %) and heating rates (5, 10, and 20 °C min^–1). With an increase in oxygen concentration, the combustion performances of oil shale could be significantly improved; the volatile-releasing temperature, ignition temperature, and burnout temperature decreased; the mass loss rate increased; and the integrated combustion characteristics of oil shale were enhanced. These improvements were attenuated when the oxygen concentration exceeded 50 vol %. When the oxygen concentration increased from 10 to 80 vol %, the average activation energy in the second combustion stage increased from 46.85 to 117.98 kJ mol^–1 by the Kissinger–Akahira–Sunose method, from 46.85 to 117.98 kJ mol^–1 by the Starink method, from 59.08 to 129.17 kJ mol^–1 by the Friedman method, and from 36.34 to 57.58 kJ mol^–1 by the Coats–Redfern method at a heating rate of 20 °C min^–1. Results indicated oxygen enrichments beyond which additional enrichment yields significantly less enhancement to the combustion process.