Understanding the deposition mechanism burning Fe - rich Zhundong coal in a 0.4 MW pilot-scale facility
This study presents a comprehensive investigation of slagging characteristics associated with Fe-rich Zhundong coal (ZDC) combustion utilizing a 0.4 MWth pilot-scale facility. Slag specimens collected from three critical locations - bottom-of-furnace (BOF), superheater, and reheater zones - were sys...
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| Language: | English |
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Elsevier
2025-10-01
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| Series: | Fuel Processing Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0378382025000979 |
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| author | Yongqiang Tian Xiang He Weizhi Lv Dafu Ma Xu Zhao |
| author_facet | Yongqiang Tian Xiang He Weizhi Lv Dafu Ma Xu Zhao |
| author_sort | Yongqiang Tian |
| collection | DOAJ |
| description | This study presents a comprehensive investigation of slagging characteristics associated with Fe-rich Zhundong coal (ZDC) combustion utilizing a 0.4 MWth pilot-scale facility. Slag specimens collected from three critical locations - bottom-of-furnace (BOF), superheater, and reheater zones - were systematically characterized through multi-analytical approaches including X-ray fluorescence (XRF), X-ray diffraction (XRD), and scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDS), complemented by molecular dynamics simulations to elucidate microscopic deposition mechanisms. Key findings reveal that: Distinct melting phenomena were observed across all sampling locations under flue gas temperatures (FGT) ranging from 1000 to 1350 °C, primarily attributed to both the formation of SiCa low-temperature eutectic phases and fluxing effects of Fe-bearing material. Comparative analysis identified sulfate-induced contamination in reheater deposits at moderate-to-low FGT regimes (1000–1200 °C), demonstrating deposition characteristics analogous to Ca-rich ZDC slag formations. The interaction mechanisms of sulfur in reheater zones promoted FeNa synergistic effects. The slag produced through low-temperature ashing exhibits lower fusion temperatures. Molecular dynamics simulations further confirmed that elevated combustion temperatures facilitate SiCa eutectic formation while promoting preferential deposition of Na2SO4/ CaSO4 on low-temperature heat exchange surfaces. When using Fe-rich ZDC in the ∏-type boiler, the FGT at the furnace outlet needs to be reduced to at least 1000 °C. |
| format | Article |
| id | doaj-art-0e607f29be4e4cd0b0304d2c9bfa5c7e |
| institution | Kabale University |
| issn | 0378-3820 |
| language | English |
| publishDate | 2025-10-01 |
| publisher | Elsevier |
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| series | Fuel Processing Technology |
| spelling | doaj-art-0e607f29be4e4cd0b0304d2c9bfa5c7e2025-08-20T03:32:00ZengElsevierFuel Processing Technology0378-38202025-10-0127610827310.1016/j.fuproc.2025.108273Understanding the deposition mechanism burning Fe - rich Zhundong coal in a 0.4 MW pilot-scale facilityYongqiang Tian0Xiang He1Weizhi Lv2Dafu Ma3Xu Zhao4College of Smart Energy, Shanghai Jiaotong University, Shanghai 200240, China; SPIC Xinjiang Wucaiwan Power Generation Co., Ltd, Xinjaing 831700, China; Corresponding author at: College of Smart Energy, Shanghai Jiaotong University, Shanghai 200240, China.Shanghai Power Equipment Research Institute Co., Ltd, Shanghai 200240, ChinaShanghai Power Equipment Research Institute Co., Ltd, Shanghai 200240, ChinaShanghai Power Equipment Research Institute Co., Ltd, Shanghai 200240, ChinaShanghai Power Equipment Research Institute Co., Ltd, Shanghai 200240, ChinaThis study presents a comprehensive investigation of slagging characteristics associated with Fe-rich Zhundong coal (ZDC) combustion utilizing a 0.4 MWth pilot-scale facility. Slag specimens collected from three critical locations - bottom-of-furnace (BOF), superheater, and reheater zones - were systematically characterized through multi-analytical approaches including X-ray fluorescence (XRF), X-ray diffraction (XRD), and scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDS), complemented by molecular dynamics simulations to elucidate microscopic deposition mechanisms. Key findings reveal that: Distinct melting phenomena were observed across all sampling locations under flue gas temperatures (FGT) ranging from 1000 to 1350 °C, primarily attributed to both the formation of SiCa low-temperature eutectic phases and fluxing effects of Fe-bearing material. Comparative analysis identified sulfate-induced contamination in reheater deposits at moderate-to-low FGT regimes (1000–1200 °C), demonstrating deposition characteristics analogous to Ca-rich ZDC slag formations. The interaction mechanisms of sulfur in reheater zones promoted FeNa synergistic effects. The slag produced through low-temperature ashing exhibits lower fusion temperatures. Molecular dynamics simulations further confirmed that elevated combustion temperatures facilitate SiCa eutectic formation while promoting preferential deposition of Na2SO4/ CaSO4 on low-temperature heat exchange surfaces. When using Fe-rich ZDC in the ∏-type boiler, the FGT at the furnace outlet needs to be reduced to at least 1000 °C.http://www.sciencedirect.com/science/article/pii/S0378382025000979∏-type boilerAsh fusibilitySlaggingFoulingAlkali and alkaline earth metal |
| spellingShingle | Yongqiang Tian Xiang He Weizhi Lv Dafu Ma Xu Zhao Understanding the deposition mechanism burning Fe - rich Zhundong coal in a 0.4 MW pilot-scale facility Fuel Processing Technology ∏-type boiler Ash fusibility Slagging Fouling Alkali and alkaline earth metal |
| title | Understanding the deposition mechanism burning Fe - rich Zhundong coal in a 0.4 MW pilot-scale facility |
| title_full | Understanding the deposition mechanism burning Fe - rich Zhundong coal in a 0.4 MW pilot-scale facility |
| title_fullStr | Understanding the deposition mechanism burning Fe - rich Zhundong coal in a 0.4 MW pilot-scale facility |
| title_full_unstemmed | Understanding the deposition mechanism burning Fe - rich Zhundong coal in a 0.4 MW pilot-scale facility |
| title_short | Understanding the deposition mechanism burning Fe - rich Zhundong coal in a 0.4 MW pilot-scale facility |
| title_sort | understanding the deposition mechanism burning fe rich zhundong coal in a 0 4 mw pilot scale facility |
| topic | ∏-type boiler Ash fusibility Slagging Fouling Alkali and alkaline earth metal |
| url | http://www.sciencedirect.com/science/article/pii/S0378382025000979 |
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