Ignition and Combustion Characteristics of Heavy Oil in Supercritical Hydrothermal Conditions

Jianhua Bai, Fayuan Zhou (), Wei Zhang, Hua Zhang, Zicheng Li, Shuzhong Wang, Yanhui Li, Xiaodong Han and Hao Chen
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Jianhua Bai: CNOOC (China) Limited, Tianjin Branch, Tianjin 300452, China
Fayuan Zhou: CNOOC (China) Limited, Tianjin Branch, Tianjin 300452, China
Wei Zhang: CNOOC (China) Limited, Tianjin Branch, Tianjin 300452, China
Hua Zhang: CNOOC (China) Limited, Tianjin Branch, Tianjin 300452, China
Zicheng Li: Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Shuzhong Wang: Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Yanhui Li: Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Xiaodong Han: CNOOC (China) Limited, Tianjin Branch, Tianjin 300452, China
Hao Chen: CNOOC EnerTech-Drilling & Production Co., Tianjin 300452, China

Energies, 2025, vol. 18, issue 18, 1-12

Abstract: At present, the characteristics of supercritical hydrothermal combustion for heavy oils remain unclear, which severely limits the application of this process. In this work, the effect of key parameters on the characteristics of supercritical hydrothermal combustion of heavy oil are studied. The heat value at a heavy oil concentration of 30 wt.% is 12.21 MJ·kg −1 , significantly higher than that of an alcohol–water mixture with an equivalent mass fraction. Thus, the minimum ignition temperature of heavy oil can reach the subcritical temperature of 300 °C. Appropriately increasing pressure and the oxidation coefficient can enhance burnout efficiency, but an excessively high oxidation coefficient will produce adverse effects. The optimized parameters for heavy oil supercritical hydrothermal combustion are a preheating temperature of 350 °C, a fuel concentration of 30 wt.%, an oxidation coefficient of 1.5, and a reaction pressure of 25 MPa, resulting in a burnout rate of 99.15%.

Keywords: supercritical hydrothermal combustion; ignition characteristics; combustion characteristics of heavy oil (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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