研究初始载荷应力的卸载扰动对粒状煤微观结构和热力学行为的影响

IF 1.8 4区 工程技术 Q3 Chemical Engineering
Hui‐yong Niu, Si‐wei Sun, Qing‐qing Sun, Hai‐yan Wang, Hong‐Yu Pan, Xi Yang, Xiao‐dong Yu
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引用次数: 0

摘要

随着煤炭开采技术的进步,煤层的开采前应力也随之增加。开采后,煤层断裂和卸载,使颗粒煤留在煤层中,自燃风险很高。为研究不同深度煤层中颗粒煤的氧化行为和内在机理,对新鲜煤施加 4 至 16 兆帕的静态应力,然后进行卸载处理,生成初始应力不同的颗粒煤。随后,对不同深度煤层中的颗粒煤进行了模拟。利用低温氮吸附仪、傅立叶红外光谱仪和同步热分析系统分析了卸载后颗粒煤的结构特征(孔隙和功能团)和氧化发热性能。研究结果表明,随着初始加载应力的增加,未加载散煤内部的微孔和中孔数量减少,而大孔数量增加。此外,重要的氧化活性结构(包括 -OH、-CH3、-CH2-、C=O 和 -COOH)逐渐增加,超过 8 兆帕后略有减少。卸压过程导致散煤特征温度逐渐降低,超过 8 MPa 后特征温度升高,但仍低于原煤特征温度。随着煤层埋深的增加,未加载颗粒煤的氧化行为变得更加明显,导致自燃的趋势和风险增加。如果深部煤层的初始加载应力过大,所产生的未加载颗粒煤的氧化发热能力可能会略有下降,但仍会造成重大灾害风险。研究成果可为减轻和管理不同深度煤层开采作业中的自燃风险提供有价值的启示。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study on the influence of unloading disturbance of initial load stress on the microstructure and thermodynamic behavior of granular coal
With the advancement of coal mining, the pre‐mining stress on the coal seam increases. After mining, the coal seam fractures and unloads, leaving granular coal in the goaf with a high risk of spontaneous combustion. To investigate the oxidation behavior and underlying mechanisms of granular coal in goafs at various depths, fresh coal was subjected to static stresses ranging from 4 to 16 MPa and then underwent unloading treatment to generate granular coal with varying initial stresses. Subsequently, simulations of granular coal in goafs at various depths were conducted. Structural characteristics (pores and functional groups) and oxidation heat production performance of the granular coal after unloading were analyzed using a low‐temperature nitrogen adsorption instrument, a Fourier infrared spectrometer, and a simultaneous thermal analysis system. The findings suggest that as the initial loading stress increases, the number of micropores and mesopores within the unloaded bulk coal decreases, while the number of macropores increases. Furthermore, important oxidation‐active structures, including ‐OH, ‐CH3, ‐CH2‐, C=O, and ‐COOH, gradually increase, with a slight decrease observed after exceeding 8 MPa. The pressure‐unloading process leads to a gradual decrease in the characteristic temperature of the bulk coal, with the characteristic temperature increasing after exceeding 8 MPa, although it still remains lower than that of the raw coal. As the burial depth of the goaf increases, the oxidation behavior of the unloaded granular coal becomes more pronounced, leading to an increased tendency and risk of spontaneous combustion. If the initial loading stress on deep coal seams is excessive, the oxidation heat production capacity of the resulting unloaded granular coal may be slightly diminished, yet it still poses a significant disaster risk. The research results can provide valuable insights for mitigating and managing spontaneous combustion risks in coal seam mining operations conducted at different depths.
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来源期刊
Asia-Pacific Journal of Chemical Engineering
Asia-Pacific Journal of Chemical Engineering 工程技术-工程:化工
CiteScore
3.50
自引率
11.10%
发文量
111
审稿时长
2.8 months
期刊介绍: Asia-Pacific Journal of Chemical Engineering is aimed at capturing current developments and initiatives in chemical engineering related and specialised areas. Publishing six issues each year, the journal showcases innovative technological developments, providing an opportunity for technology transfer and collaboration. Asia-Pacific Journal of Chemical Engineering will focus particular attention on the key areas of: Process Application (separation, polymer, catalysis, nanotechnology, electrochemistry, nuclear technology); Energy and Environmental Technology (materials for energy storage and conversion, coal gasification, gas liquefaction, air pollution control, water treatment, waste utilization and management, nuclear waste remediation); and Biochemical Engineering (including targeted drug delivery applications).
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