Retorting Oil Shale by a Self-Heating Route

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• 作者：Hongfan Guo ; Siyuan Peng ; Jiadong Lin ; Jiang Chang ; Shan Lei ; Tianbo Fan ; Yunyi Liu
• 刊名：Energy & Fuels
• 出版年：2013
• 出版时间：May 16, 2013
• 年：2013
• 卷：27
• 期：5
• 页码：2445-2451
• 全文大小：370K
• 年卷期：v.27,no.5(May 16, 2013)
• ISSN：1520-5029

文摘

Retorting is a frequently used method for producing shale oil from oil shale. During retorting, heat is usually supplied to the retort by heat-carrier gas of high temperature, such as 700 掳C, until retorting ends. In this work, a low-energy-input retorting process using low-temperature carrier gas but without marked loss in oil yield was achieved by a self-heating effect, that is, spontaneously increasing retorting temperature in the absence of external heat provision. The self-heating retorting process starts by preheating oil shale from room temperature to 300 掳C by external heating under N₂ and then switching N₂ to air of 150 掳C. When N₂ is replaced by air, the self-heating effect starts. Subsequently, the temperature of raw oil shale can increase spontaneously to complete the retorting, so that an external heat supply is no longer required. While using only N₂ or only air as the carrier gas throughout the whole retorting process cannot produce such a good effect. In this N₂-air sequence retorting process, because an external heat supply is needed only to preheat the raw oil shale to 300 掳C (i.e., the required energy input and external-heating terminal temperature are low), the retorting process is significantly simplified. The present work provides a promising starting point for the further development of not only ex situ (aboveground) but also in situ (underground) retorting for the production of shale oil.