Effect of high geothermal environments on microscopic properties and oxidation processes of waterlogged coal
In mines with deep levels and those exhibiting anomalous geothermal temperatures, high geothermal environments can affect the erosion process of waterlogged coal by immersion. To study the influence of a high geothermal environment regarding the self-ignition of waterlogged coal, immersion of the co...
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| Format: | Article |
| Language: | English |
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Elsevier
2024-12-01
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| Series: | Case Studies in Thermal Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X24015272 |
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| author | Xun Zhang Chuang Li Bing Lu Fengwei Dai Ge Huang Ronghai Sun |
| author_facet | Xun Zhang Chuang Li Bing Lu Fengwei Dai Ge Huang Ronghai Sun |
| author_sort | Xun Zhang |
| collection | DOAJ |
| description | In mines with deep levels and those exhibiting anomalous geothermal temperatures, high geothermal environments can affect the erosion process of waterlogged coal by immersion. To study the influence of a high geothermal environment regarding the self-ignition of waterlogged coal, immersion of the coals in aqueous solutions under various temperature conditions (room temperature 20 °C, 40 °C, 60 °C and 80°) for 30 days. Low-temperature nitrogen adsorption, infrared spectroscopy, and simultaneous thermal analysis were utilized to examine the alterations in the micro physicochemical structure and oxidation process of waterlogged coal samples at room temperature and high geothermal temperature. Compared with room temperature conditions, the high geothermal environment increased the number and volume of pores in the waterlogged coal, broke intermolecular hydrogen bonds, and increased the total number of reactive groups. These microstructural changes affected the oxidation process of the waterlogged coal, causing in the oxidation characteristic temperature points on the TG and DSC curves as well as the activation energies E of the second and third stages of TG being significantly lower than those of the waterlogged coal under room temperature conditions. This study suggests that the high geothermal environment enhances the spontaneous combustion tendency of waterlogged coal and accelerates its oxidation process. |
| format | Article |
| id | doaj-art-975569ca57f74e05a1bc806c16440036 |
| institution | OA Journals |
| issn | 2214-157X |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj-art-975569ca57f74e05a1bc806c164400362025-08-20T02:37:30ZengElsevierCase Studies in Thermal Engineering2214-157X2024-12-016410549610.1016/j.csite.2024.105496Effect of high geothermal environments on microscopic properties and oxidation processes of waterlogged coalXun Zhang0Chuang Li1Bing Lu2Fengwei Dai3Ge Huang4Ronghai Sun5College of Mining, Liaoning Technical University, Fuxin, Liaoning, 123000, China; Institute of Safety Engineering and Technology, Liaoning Technical University, Fuxin, Liaoning, 123000, ChinaCollege of Safety Science & Engineering, Liaoning Technical University, Fuxin, Liaoning, 123000, China; Corresponding author.College of Mining, Liaoning Technical University, Fuxin, Liaoning, 123000, ChinaCollege of Safety Science & Engineering, Liaoning Technical University, Fuxin, Liaoning, 123000, ChinaCollege of Safety Science & Engineering, Liaoning Technical University, Fuxin, Liaoning, 123000, ChinaCollege of Mining, Liaoning Technical University, Fuxin, Liaoning, 123000, ChinaIn mines with deep levels and those exhibiting anomalous geothermal temperatures, high geothermal environments can affect the erosion process of waterlogged coal by immersion. To study the influence of a high geothermal environment regarding the self-ignition of waterlogged coal, immersion of the coals in aqueous solutions under various temperature conditions (room temperature 20 °C, 40 °C, 60 °C and 80°) for 30 days. Low-temperature nitrogen adsorption, infrared spectroscopy, and simultaneous thermal analysis were utilized to examine the alterations in the micro physicochemical structure and oxidation process of waterlogged coal samples at room temperature and high geothermal temperature. Compared with room temperature conditions, the high geothermal environment increased the number and volume of pores in the waterlogged coal, broke intermolecular hydrogen bonds, and increased the total number of reactive groups. These microstructural changes affected the oxidation process of the waterlogged coal, causing in the oxidation characteristic temperature points on the TG and DSC curves as well as the activation energies E of the second and third stages of TG being significantly lower than those of the waterlogged coal under room temperature conditions. This study suggests that the high geothermal environment enhances the spontaneous combustion tendency of waterlogged coal and accelerates its oxidation process.http://www.sciencedirect.com/science/article/pii/S2214157X24015272Waterlogged coalHigh geothermal temperatureMicro physicochemical structureOxidation process |
| spellingShingle | Xun Zhang Chuang Li Bing Lu Fengwei Dai Ge Huang Ronghai Sun Effect of high geothermal environments on microscopic properties and oxidation processes of waterlogged coal Case Studies in Thermal Engineering Waterlogged coal High geothermal temperature Micro physicochemical structure Oxidation process |
| title | Effect of high geothermal environments on microscopic properties and oxidation processes of waterlogged coal |
| title_full | Effect of high geothermal environments on microscopic properties and oxidation processes of waterlogged coal |
| title_fullStr | Effect of high geothermal environments on microscopic properties and oxidation processes of waterlogged coal |
| title_full_unstemmed | Effect of high geothermal environments on microscopic properties and oxidation processes of waterlogged coal |
| title_short | Effect of high geothermal environments on microscopic properties and oxidation processes of waterlogged coal |
| title_sort | effect of high geothermal environments on microscopic properties and oxidation processes of waterlogged coal |
| topic | Waterlogged coal High geothermal temperature Micro physicochemical structure Oxidation process |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X24015272 |
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