Numerical Simulation of Temperature Field Evolution and Distribution Range During Movement of Underground Coal Gasification Working Face

Wei Li, Jian Liu, Lin Xin (), Wei Li, Jianguo Fan, Xianmin Wang, Yan Ma, Weimin Cheng, Jiancai Sui and Maofei Niu
Additional contact information
Wei Li: Shandong Energy Group Co., Ltd., Jinan 250014, China
Jian Liu: Shandong Energy Group Co., Ltd., Jinan 250014, China
Lin Xin: College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Wei Li: Shandong Energy Power Group Co., Ltd., Jinan 250014, China
Jianguo Fan: Shandong Energy Group Co., Ltd., Jinan 250014, China
Xianmin Wang: Shandong Energy Power Group Co., Ltd., Jinan 250014, China
Yan Ma: Shandong Energy Power Group Co., Ltd., Jinan 250014, China
Weimin Cheng: College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Jiancai Sui: Shandong Energy Group Co., Ltd., Jinan 250014, China
Maofei Niu: College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China

Energies, 2025, vol. 18, issue 4, 1-16

Abstract: Studying temperature evolution and distribution range during underground coal gasification is essential to optimize process efficiency, ensure safe and stable operation and reduce environmental impact. In this paper, based on the Liyan Coal Mine underground gasification project, the moving grid setting is used to simulate the moving heat transfer process of the underground coal gasification (UCG) flame working face (FWF). The results showed that the temperature distribution within the coal wall facing the flame is relatively narrow and remains concentrated within a limited range. Temperature distribution curves for T = 100 °C and T = 600 °C initially exhibit a nonlinear increase, reaching a maximum value, followed by a nonlinear decrease, ultimately trending towards a constant value. The maximum temperature influence ranges at ∆T = 10 °C (T = 30 °C) in the roof, left coal pillar, and floor are approximately 13.0 m, 9.0 m, and 10.1 m, respectively. The temperature values at the +1 m and +2 m positions on the roof exhibit a parabolic pattern, with the height and width of the temperature curve gradually increasing. By the end of the operation at t = 190 d, the length range of temperatures exceeding 600 °C at the +1 m position is 73 m, with a maximum temperature of approximately 825 °C, while at the +2 m position it is 31 m, with a maximum temperature of approximately 686 °C.

Keywords: underground coal gasification; temperature; distribution range; COMSOL; flame working face (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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