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 引用本文: 刘曰武, 方惠军, 李龙龙, 葛腾泽, 郑太毅, 刘丹璐, 丁玖阁. 煤炭地下气化关键力学问题的数值研究进展. 力学学报, 2023, 55(3): 669-685.
Liu Yuewu, Fang Huijun, Li Longlong, Ge Tengze, Zheng Taiyi, Liu Danlu, Ding Jiuge. Recent progress on numerical research of key mechanical problems during underground coal gasification. Chinese Journal of Theoretical and Applied Mechanics, 2023, 55(3): 669-685.
 Citation: Liu Yuewu, Fang Huijun, Li Longlong, Ge Tengze, Zheng Taiyi, Liu Danlu, Ding Jiuge. Recent progress on numerical research of key mechanical problems during underground coal gasification. Chinese Journal of Theoretical and Applied Mechanics, 2023, 55(3): 669-685.

## RECENT PROGRESS ON NUMERICAL RESEARCH OF KEY MECHANICAL PROBLEMS DURING UNDERGROUND COAL GASIFICATION

• 摘要: 煤炭资源的清洁高效利用已成为“双碳”背景下科学研究的重要方向和新课题. 在众多相关技术中, 煤炭地下气化技术近年来得到快速发展并展现出巨大潜力. 然而, 由于室内实验和现场试验的实施成本非常高, 气化机理认识和控制运行工艺优化方面的研究均受到很大限制. 近年来, 运行成本低、操作简单、实施周期短的数值模拟方法成为重要的研究工具, 得到越来越多的关注. 由于煤炭地下气化过程极其复杂, 数值模拟方法在数学建模和数值求解方面均面临巨大挑战. 对此, 本文开展了以下工作: 对煤炭地下气化过程进行了详细分析, 阐明各个运行空间的物质和关键问题, 厘清煤炭地下气化的本质; 归纳出流体动力学问题、热力学问题、材料应力问题以及化学反应动力学问题等4类关键力学问题; 详细介绍每个关键力学问题数值研究的最新成果和发展历程; 介绍煤炭地下气化数值研究的工程应用, 并指出其发展趋势. 本文工作对推动煤炭地下气化数值方法的发展以及指导我国煤炭地下气化先导试验设计和现场实施有积极的理论意义.

Abstract: Clean and efficient coal utilization becomes an important direction and new research topic under the dual-carbon background. Recently, underground coal gasification (UCG) develops very fast and shows great potential in this area. However, the laboratory and field experiments, which are usually used to investigate the gasification mechanisms and optimize the operating parameters, are quite expensive. Thus, there is a strong demand for the numerical approach that is low-cost, easy operation, and short-cycle. Currently, the numerical approach faces challenges in terms of mathematical modelling and numerical method for solving the nonlinear system because of the complexity of the gasification process. To deal with that, we have done the work as follows: clarified the materials and key problems in each space based on a detailed analysis and revealed the essence of the UCG; summarized four kinds of key mechanical issues including fluid dynamics, thermodynamics, material mechanics, and chemical reaction kinetics; reviewed the development history of numerical research for key mechanical problems in detail and introduced the latest results; illustrated the status of engineering application of numerical research and pointed out the development trends. The work in this paper has positive theoretical significance for the development of the numerical technique for UCG and guiding the design and implementation of UCG trials in China.

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