Effect of Hydrothermal Dewatering on Low-Temperature Oxidation of Lignite
The hydrothermal dewatering (HTD) of lignite results in noticeable variations in the low-temperature oxidation process. Consequently, this study was made on the gas release and temperature change characteristics to investigate the oxidation kinetics and mechanism of HTD coal samples. In this study,...
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MDPI AG
2025-04-01
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| author | Qiong Mo Junjie Liao Yankun Yang Lin Gao Liping Chang Weiren Bao Xianshu Dong Yuping Fan Guichuan Ye |
| author_facet | Qiong Mo Junjie Liao Yankun Yang Lin Gao Liping Chang Weiren Bao Xianshu Dong Yuping Fan Guichuan Ye |
| author_sort | Qiong Mo |
| collection | DOAJ |
| description | The hydrothermal dewatering (HTD) of lignite results in noticeable variations in the low-temperature oxidation process. Consequently, this study was made on the gas release and temperature change characteristics to investigate the oxidation kinetics and mechanism of HTD coal samples. In this study, a lignite from Inner Mongolia in China was upgraded by HTD. N<sub>2</sub> adsorption, SEM, FT-IR, and chemical titration experiments were also carried out on raw and HTD coal samples to relate the physico-chemical structure properties with low-temperature oxidation characteristics. Results show that HTD coal samples have higher low-temperature oxidation activities and lower critical ignition temperatures compared with raw coal. According to the change in activation energy by kinetic analysis, the low-temperature oxidation process in the temperature range 35–140 °C could be divided into the stage I (oxygen adsorption stage) and stage II (accelerated oxidation stage). The correlation analysis indicates that the oxygen adsorption stage is controlled by the aliphatic and surface structures, while the accelerated oxidation stage is jointly affected by the competition of physico-chemical structures. The oxygen adsorption stage promotes the progress in accelerated oxidation stage. |
| format | Article |
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| institution | DOAJ |
| issn | 1420-3049 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | MDPI AG |
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| series | Molecules |
| spelling | doaj-art-a4c9ad56703f431fbdab20cbdf2b42482025-08-20T02:59:14ZengMDPI AGMolecules1420-30492025-04-01309193210.3390/molecules30091932Effect of Hydrothermal Dewatering on Low-Temperature Oxidation of LigniteQiong Mo0Junjie Liao1Yankun Yang2Lin Gao3Liping Chang4Weiren Bao5Xianshu Dong6Yuping Fan7Guichuan Ye8College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaState Key Laboratory of Clean and Efficient Coal Utilization, College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaState Key Laboratory of Clean and Efficient Coal Utilization, College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaState Key Laboratory of Clean and Efficient Coal Utilization, College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaState Key Laboratory of Clean and Efficient Coal Utilization, College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaState Key Laboratory of Clean and Efficient Coal Utilization, College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaThe hydrothermal dewatering (HTD) of lignite results in noticeable variations in the low-temperature oxidation process. Consequently, this study was made on the gas release and temperature change characteristics to investigate the oxidation kinetics and mechanism of HTD coal samples. In this study, a lignite from Inner Mongolia in China was upgraded by HTD. N<sub>2</sub> adsorption, SEM, FT-IR, and chemical titration experiments were also carried out on raw and HTD coal samples to relate the physico-chemical structure properties with low-temperature oxidation characteristics. Results show that HTD coal samples have higher low-temperature oxidation activities and lower critical ignition temperatures compared with raw coal. According to the change in activation energy by kinetic analysis, the low-temperature oxidation process in the temperature range 35–140 °C could be divided into the stage I (oxygen adsorption stage) and stage II (accelerated oxidation stage). The correlation analysis indicates that the oxygen adsorption stage is controlled by the aliphatic and surface structures, while the accelerated oxidation stage is jointly affected by the competition of physico-chemical structures. The oxygen adsorption stage promotes the progress in accelerated oxidation stage.https://www.mdpi.com/1420-3049/30/9/1932lignitehydrothermal dewateringlow-temperature oxidationkinetic analysiscorrelation analysis |
| spellingShingle | Qiong Mo Junjie Liao Yankun Yang Lin Gao Liping Chang Weiren Bao Xianshu Dong Yuping Fan Guichuan Ye Effect of Hydrothermal Dewatering on Low-Temperature Oxidation of Lignite Molecules lignite hydrothermal dewatering low-temperature oxidation kinetic analysis correlation analysis |
| title | Effect of Hydrothermal Dewatering on Low-Temperature Oxidation of Lignite |
| title_full | Effect of Hydrothermal Dewatering on Low-Temperature Oxidation of Lignite |
| title_fullStr | Effect of Hydrothermal Dewatering on Low-Temperature Oxidation of Lignite |
| title_full_unstemmed | Effect of Hydrothermal Dewatering on Low-Temperature Oxidation of Lignite |
| title_short | Effect of Hydrothermal Dewatering on Low-Temperature Oxidation of Lignite |
| title_sort | effect of hydrothermal dewatering on low temperature oxidation of lignite |
| topic | lignite hydrothermal dewatering low-temperature oxidation kinetic analysis correlation analysis |
| url | https://www.mdpi.com/1420-3049/30/9/1932 |
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