Low-Temperature Oxidation Characteristics and Apparent Activation Energy of Pressurized Crushed Coal Under Stress Loading

IF 4.8 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Tingxiang Chu, Chunxi Wu, Boning Jiang, Tianru Zhu, Xi Zhang, Yuexia Chen, Lei Li
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引用次数: 0

Abstract

With increasing mining depth, coal is more affected by ground and mining stresses. In order to study the characteristics and activation features of coal spontaneous combustion (CSC) under different stress conditions, experiments on low-temperature oxidation under six different stress conditions were conducted using a newly developed multi-field loading and permeability experimental device for stress-loaded and crushed coal. The experimental results showed that, with increase in axial stress from 0 to 15 MPa, the amounts of CO, CO2, C2H4 generated and the rate of oxygen consumption all first followed an increasing trend, reached maximum at 9 MPa, and then a decreasing trend. In three temperature stages—I (20 ℃ < T < 80 ℃), II (90 ℃ < T < 120 ℃), and III (120 ℃ < T < 150 ℃)—all under increasing axial stress from 0 to 15 MPa, the apparent activation energy (AAE) followed a decreasing and then relatively increasing trend. The AAE in all three temperature stages reached a minimum of 9.60 kJ mol−1, 60.57 kJ mol−1, and 19.61 kJ mol−1, respectively, at 9 MPa. Combining the characteristics of gas generation, oxygen consumption, and changes in AAE during the low-temperature oxidation of stress-bearing crushed coal, it was found that stress loading to a certain extent promotes the occurrence of CSC.

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来源期刊
Natural Resources Research
Natural Resources Research Environmental Science-General Environmental Science
CiteScore
11.90
自引率
11.10%
发文量
151
期刊介绍: This journal publishes quantitative studies of natural (mainly but not limited to mineral) resources exploration, evaluation and exploitation, including environmental and risk-related aspects. Typical articles use geoscientific data or analyses to assess, test, or compare resource-related aspects. NRR covers a wide variety of resources including minerals, coal, hydrocarbon, geothermal, water, and vegetation. Case studies are welcome.
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