Methods for enhancing resource recovery efficiency in underground coal gasification to promote its large-scale utilization

IF 3.3 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment Pub Date : 2025-02-20 DOI:10.1016/j.gete.2025.100651

Huaizhan Li , Jingchun Cao , Chao Tang , Guangli Guo , Yanpeng Chen , Jianfeng Zha , Wengang Huang , Yafei Yuan , Jianyong Huang

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引用次数: 0

Abstract

The resource recovery efficiency in underground coal gasification (UCG) is directly linked to economic efficiency and is currently the key factor limiting the widespread application of this technology. To address the issue of low resource recovery efficiencies UCG, this study conducts a comprehensive analysis of resource recovery efficiencies from two UCG test sites. By integrating the characteristics of well-less UCG processes, the established calculation method for the development height of overburden fractures under thermo-mechanical coupling and the stability evaluation model of isolation coal pillars are used. Using an artificial fish swarm algorithm, the method to enhance UCG resource recovery efficiencies is proposed. Application of the method at the Ulanqab UCG site has successfully increased the resource recovery efficiency from 40 % to 60 %, and the study also clarifies the influence of various geological conditions on gasification recovery efficiencies. These findings hold practical significance for promoting the large-scale development of UCG.

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地下煤气化（UCG）的资源回收效率与经济效益直接相关，是目前限制该技术广泛应用的关键因素。针对 UCG 资源回收效率低的问题，本研究对两个 UCG 试验场的资源回收效率进行了综合分析。结合无井 UCG 工艺的特点，采用已建立的热-机耦合条件下覆盖层裂缝发育高度计算方法和隔离煤柱稳定性评价模型。利用人工鱼群算法，提出了提高 UCG 资源回收效率的方法。该方法在乌兰察布铀转化气现场的应用成功地将资源回收效率从 40% 提高到 60%，研究还阐明了各种地质条件对气化回收效率的影响。这些研究结果对于促进大规模开发铀转化气（UCG）具有现实意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geomechanics for Energy and the Environment Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology

CiteScore

5.90

自引率

11.80%

发文量

期刊介绍： The aim of the Journal is to publish research results of the highest quality and of lasting importance on the subject of geomechanics, with the focus on applications to geological energy production and storage, and the interaction of soils and rocks with the natural and engineered environment. Special attention is given to concepts and developments of new energy geotechnologies that comprise intrinsic mechanisms protecting the environment against a potential engineering induced damage, hence warranting sustainable usage of energy resources. The scope of the journal is broad, including fundamental concepts in geomechanics and mechanics of porous media, the experiments and analysis of novel phenomena and applications. Of special interest are issues resulting from coupling of particular physics, chemistry and biology of external forcings, as well as of pore fluid/gas and minerals to the solid mechanics of the medium skeleton and pore fluid mechanics. The multi-scale and inter-scale interactions between the phenomena and the behavior representations are also of particular interest. Contributions to general theoretical approach to these issues, but of potential reference to geomechanics in its context of energy and the environment are also most welcome.