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Energy & Fuels, Vol.35, No.3, 2838-2844, 2021
Studies of the Bubbling Fluidized Bed Retorting of Dachengzi Oil Shale: 1. Effect of Retorting Temperature
Fluidized bed retorting of oil shale is a potential technology with high shale oil yield. However, there are few studies on the composition distribution of the products of this technology. In this work, Dachengzi oil shale from Huadian city of China was retorted in a bubbling fluidized bed reactor, focusing on the effect of retorting temperature on the yield and composition distribution of products. With increasing retorting temperature, shale oil yield increased up to 522 degrees C and then decreased, and noncondensable gas always kept slow growth, while shale char decreased significantly. The H/C atomic ratio of shale oil decreased with increasing temperature, which was attributed to the strengthened dehydrocyclization and aromatization reactions of shale oil. Higher temperatures promoted more oxygen-containing functional groups releasing in forms of CO2 and CO, decreasing the O/C atomic ratio of shale oil. At the same time, higher retorting temperatures could also enhance cracking reactions and thus reduce heavy fractions of shale oil. With the increase of retorting temperature, the content of aliphatics decreased up to 562 degrees C and then increased, while the content of aromatics was always increasing. The yields of inorganic gases and some hydrocarbon gases, as well as the total alkenes/alkanes ratio increased because of the strengthened secondary cracking reactions at higher temperatures.