Transformation of Mg-bearing minerals and its effect on slagging during the high-alkali coal combustion
To better understand the mineralogical, release-transformation patterns and ash deposition of Mg-bearing minerals, Wucaiwan Coal (WCW), Meihuajing Coal (MHJ), and slag of water wall from a power plant were collected and high-temperature ash transformation experiments were conducted. X-ray fluorescen...
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Elsevier
2025-03-01
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| Series: | Fuel Processing Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S037838202400136X |
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| author | Bowen Chen Zhuo Xiong Yongchun Zhao Junying Zhang |
| author_facet | Bowen Chen Zhuo Xiong Yongchun Zhao Junying Zhang |
| author_sort | Bowen Chen |
| collection | DOAJ |
| description | To better understand the mineralogical, release-transformation patterns and ash deposition of Mg-bearing minerals, Wucaiwan Coal (WCW), Meihuajing Coal (MHJ), and slag of water wall from a power plant were collected and high-temperature ash transformation experiments were conducted. X-ray fluorescence (XRF), X-ray diffractometer (XRD), scanning electron microscope coupled with energy dispersive spectrometer (SEM-EDS), and simultaneous thermogravimetry and differential scanning calorimetry (TG-DSC) were used to analyze the mineralogy, chemical composition, and characteristics. The results show that the Mg-bearing minerals in high-alkali coal and ash include dolomite, chlorite, forsterite, melilite, akermanite, diopside, bredigite, pyroxene, periclase, spinel, and magnesioferrite. During combustion, the release of Mg is affected by its mode of occurrence. Mg-bearing minerals gradually transform into thermally stable minerals, including spinel, periclase, and pyroxene, with the transformation pathway being dolomite → Mg-bearing silicate (diopside, akermanite, bredigite) → pyroxene/spinel/periclase. Moreover, Ca has a competitive and synergistic effect on the transformation of Mg-bearing minerals, which depends on the relative content of Si and Al in ash. Spinel is the primary Mg-bearing mineral in high-temperature ash, and Fe may substitute for both Mg and Al. In coal combustion, the formation of Mg-Al-Fe and Mg-Al-Fe-Si-Ca eutectic systems from Mg-bearing minerals causes slagging on the water wall and worsens water wall corrosion. |
| format | Article |
| id | doaj-art-9b7e42dd72cd447797ccfd2a543445c8 |
| institution | Kabale University |
| issn | 0378-3820 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Fuel Processing Technology |
| spelling | doaj-art-9b7e42dd72cd447797ccfd2a543445c82025-01-15T04:11:32ZengElsevierFuel Processing Technology0378-38202025-03-01267108166Transformation of Mg-bearing minerals and its effect on slagging during the high-alkali coal combustionBowen Chen0Zhuo Xiong1Yongchun Zhao2Junying Zhang3State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaState Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaState Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaCorresponding author.; State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaTo better understand the mineralogical, release-transformation patterns and ash deposition of Mg-bearing minerals, Wucaiwan Coal (WCW), Meihuajing Coal (MHJ), and slag of water wall from a power plant were collected and high-temperature ash transformation experiments were conducted. X-ray fluorescence (XRF), X-ray diffractometer (XRD), scanning electron microscope coupled with energy dispersive spectrometer (SEM-EDS), and simultaneous thermogravimetry and differential scanning calorimetry (TG-DSC) were used to analyze the mineralogy, chemical composition, and characteristics. The results show that the Mg-bearing minerals in high-alkali coal and ash include dolomite, chlorite, forsterite, melilite, akermanite, diopside, bredigite, pyroxene, periclase, spinel, and magnesioferrite. During combustion, the release of Mg is affected by its mode of occurrence. Mg-bearing minerals gradually transform into thermally stable minerals, including spinel, periclase, and pyroxene, with the transformation pathway being dolomite → Mg-bearing silicate (diopside, akermanite, bredigite) → pyroxene/spinel/periclase. Moreover, Ca has a competitive and synergistic effect on the transformation of Mg-bearing minerals, which depends on the relative content of Si and Al in ash. Spinel is the primary Mg-bearing mineral in high-temperature ash, and Fe may substitute for both Mg and Al. In coal combustion, the formation of Mg-Al-Fe and Mg-Al-Fe-Si-Ca eutectic systems from Mg-bearing minerals causes slagging on the water wall and worsens water wall corrosion.http://www.sciencedirect.com/science/article/pii/S037838202400136XHigh-alkali coalMg-bearing mineralsMineral transformationSlagging |
| spellingShingle | Bowen Chen Zhuo Xiong Yongchun Zhao Junying Zhang Transformation of Mg-bearing minerals and its effect on slagging during the high-alkali coal combustion Fuel Processing Technology High-alkali coal Mg-bearing minerals Mineral transformation Slagging |
| title | Transformation of Mg-bearing minerals and its effect on slagging during the high-alkali coal combustion |
| title_full | Transformation of Mg-bearing minerals and its effect on slagging during the high-alkali coal combustion |
| title_fullStr | Transformation of Mg-bearing minerals and its effect on slagging during the high-alkali coal combustion |
| title_full_unstemmed | Transformation of Mg-bearing minerals and its effect on slagging during the high-alkali coal combustion |
| title_short | Transformation of Mg-bearing minerals and its effect on slagging during the high-alkali coal combustion |
| title_sort | transformation of mg bearing minerals and its effect on slagging during the high alkali coal combustion |
| topic | High-alkali coal Mg-bearing minerals Mineral transformation Slagging |
| url | http://www.sciencedirect.com/science/article/pii/S037838202400136X |
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