In-situ gas contents of a multi-section coal seam in Sydney basin for coal and gas outburst management

IF 6.9 1区 工程技术 Q2 ENERGY & FUELS International Journal of Coal Science & Technology Pub Date : 2023-10-01 DOI:10.1007/s40789-023-00614-4
Zhongbei Li, Ting Ren, Dennis Black, Ming Qiao, Itmam Abedin, Jessica Juric, Mike Wang
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Abstract

Abstract The gas content is crucial for evaluating coal and gas outburst potential in underground coal mining. This study focuses on investigating the in-situ coal seam gas content and gas sorption capacity in a representative coal seam with multiple sections (A1, A2, and A3) in the Sydney basin, where the CO 2 composition exceeds 90%. The fast direct desorption method and associated devices were described in detail and employed to measure the in-situ gas components ( Q 1 , Q 2 , and Q 3 ) of the coal seam. The results show that in-situ total gas content ( Q T ) ranges from 9.48 m 3 /t for the A2 section to 14.80 m 3 /t for the A3 section, surpassing the Level 2 outburst threshold limit value, thereby necessitating gas drainage measures. Among the gas components, Q 2 demonstrates the highest contribution to Q T , ranging between 55% and 70%. Furthermore, high-pressure isothermal gas sorption experiments were conducted on coal samples from each seam section to explore their gas sorption capacity. The Langmuir model accurately characterizes CO 2 sorption behavior, with fit coefficients ( R 2 ) greater than 0.99. Strong positive correlations are observed between in-situ gas content and Langmuir volume, as well as between residual gas content ( Q 3 ) and sorption hysteresis. Notably, the A3 seam section is proved to have a higher outburst propensity due to its higher Q 1 and Q 2 gas contents, lower sorption hysteresis, and reduced coal toughness f value. The insights derived from the study can contribute to the development of effective gas management strategies and enhance the safety and efficiency of coal mining operations.

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悉尼盆地多段煤层原位含气量分析及煤与瓦斯突出治理
矿井瓦斯含量是评价煤与瓦斯突出潜力的关键。本研究重点研究了悉尼盆地具有代表性的A1、A2、A3多段煤层(CO 2成分超过90%)的煤层原煤含气量及瓦斯吸附能力。详细介绍了快速直接解吸法及其配套装置,并应用该方法对煤层中煤层气组分(q1、q2、q3)进行了原位测定。结果表明:A2段现场总含气量(Q T)为9.48 m 3 / T ~ A3段为14.80 m 3 / T,超过了2级突出阈值限值,需要采取抽放瓦斯措施;在气体组分中,q2对Q - T的贡献最大,在55% ~ 70%之间。在此基础上,对各煤层段煤样进行了高压等温气体吸附实验,探索煤样的气体吸附能力。Langmuir模型准确地描述了co2的吸附行为,拟合系数(r2)大于0.99。原位气体含量与Langmuir体积、残余气体含量(q3)与吸附滞回率呈显著正相关。值得注意的是,A3煤层区段q1和q2气体含量较高,吸附滞后较低,煤韧性f值较低,因此具有较高的突出倾向。从研究中获得的见解有助于制定有效的气体管理战略,提高煤矿开采作业的安全性和效率。
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来源期刊
CiteScore
11.40
自引率
8.40%
发文量
678
审稿时长
12 weeks
期刊介绍: The International Journal of Coal Science & Technology is a peer-reviewed open access journal that focuses on key topics of coal scientific research and mining development. It serves as a forum for scientists to present research findings and discuss challenging issues in the field. The journal covers a range of topics including coal geology, geochemistry, geophysics, mineralogy, and petrology. It also covers coal mining theory, technology, and engineering, as well as coal processing, utilization, and conversion. Additionally, the journal explores coal mining environment and reclamation, along with related aspects. The International Journal of Coal Science & Technology is published with China Coal Society, who also cover the publication costs. This means that authors do not need to pay an article-processing charge.
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