Optimization of temperature parameters for the autothermic pyrolysis in-situ conversion process of oil shale

Shaotao Xu, Xiaoshu Lü, Youhong Sun*, Wei Guo, Qiang Li, Lang Liu, Shijie Kang, Sunhua Deng*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review


In this study, a temperature optimization strategy for the Huadian oil shale autothermal pyrolysis in-situ conversion process (ATS) was first proposed by systematically investigating the reaction characteristics of various semi-cokes. As the pyrolysis temperature rised, the semi-coke's calorific value was found to undergo three different stages of increasing, decreasing, and flattening, peaking at around 330 °C. Additionally, the semi-cokes formed at different temperatures exhibited similar combustion characteristics, including combustion activation energy, combustion characteristic parameters, and product release characteristics. Due to the serious pore blockage caused by the substantial generation and the ignition coking of the bitumen, the reaction characteristics of semi-cokes were dramatically decreased at about 330 °C. Finally, the relationship between in-situ heat generation and demand at various stages of ATS process was discussed, and a reasonable strategy for the screening of temperature parameters was proposed. According to this strategy, the optimal control temperature for the preheating stage was determined at 350–370 °C and at Tact (defined in 4.3.2) for the retorting zone in the reaction stage. The results of this study provide a new perspective on the theoretical foundation of the ATS process and have crucial guiding implications for practical engineering applications.

Original languageEnglish
Article number126309
Number of pages11
Publication statusPublished - 1 Feb 2023
MoE publication typeA1 Journal article-refereed


  • Combustion characteristics
  • Heat relationship
  • Kinetic analysis
  • Oil shale
  • Temperature optimization


Dive into the research topics of 'Optimization of temperature parameters for the autothermic pyrolysis in-situ conversion process of oil shale'. Together they form a unique fingerprint.

Cite this