Modeling of arsenic migration and emission characteristics in coal-fired power plants
Copyright © 2023 Elsevier B.V. All rights reserved..
After coal combustion, the minerals present in fly ash can adsorb arsenic (As) during flue gas cooling and reduce As emissions. However, a quantitative description of this adsorption behavior is lacking. Herein, the As adsorption characteristics of minerals (Al/Ca/Fe/K/Mg/Na/Si) were investigated, and a model was developed to predict As content in fly ash. Lab-scale experiments and density functional theory calculations were performed to obtain mineral As adsorption potential. Then, the model was established using lab-scale experimental data for 11 individual coals. The model was validated using lab-scale data from ten blended coals and demonstrated acceptable performance, with prediction errors of 2.83-11.45 %. The model was applied to a 350 MW coal-fired power plant (CFPP) with five blended coals, and As concentration in the flue gas was predicted from a mass balance perspective. The experimental and predicted As contents in fly ash were 11.92-16.15 and 9.61-12.55 μg/g, respectively, with a prediction error of 17.39-22.29 %, and those in flue gas were 11.52-16.58 and 5.37-34.04 μg/Nm3. Finally, As distribution in the CFPP was explored: 0.74-1.51 % in bottom ash, 74.05-82.70 % in electrostatic precipitator ash, 0.53-1.19 % in wet flue gas desulfurization liquid, and 0.13-0.73 % in flue gas at the stack inlet.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2024 |
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| Erschienen: |
2024 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:465 |
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| Enthalten in: |
Journal of hazardous materials - 465(2024) vom: 05. Feb., Seite 133213 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Zhao, Yan [VerfasserIn] |
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| Links: |
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| Themen: |
Arsenic adsorption capacity |
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| Anmerkungen: |
Date Revised 07.02.2024 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
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| doi: |
10.1016/j.jhazmat.2023.133213 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM366253476 |
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| 500 | |a published: Print-Electronic | ||
| 500 | |a Citation Status PubMed-not-MEDLINE | ||
| 520 | |a Copyright © 2023 Elsevier B.V. All rights reserved. | ||
| 520 | |a After coal combustion, the minerals present in fly ash can adsorb arsenic (As) during flue gas cooling and reduce As emissions. However, a quantitative description of this adsorption behavior is lacking. Herein, the As adsorption characteristics of minerals (Al/Ca/Fe/K/Mg/Na/Si) were investigated, and a model was developed to predict As content in fly ash. Lab-scale experiments and density functional theory calculations were performed to obtain mineral As adsorption potential. Then, the model was established using lab-scale experimental data for 11 individual coals. The model was validated using lab-scale data from ten blended coals and demonstrated acceptable performance, with prediction errors of 2.83-11.45 %. The model was applied to a 350 MW coal-fired power plant (CFPP) with five blended coals, and As concentration in the flue gas was predicted from a mass balance perspective. The experimental and predicted As contents in fly ash were 11.92-16.15 and 9.61-12.55 μg/g, respectively, with a prediction error of 17.39-22.29 %, and those in flue gas were 11.52-16.58 and 5.37-34.04 μg/Nm3. Finally, As distribution in the CFPP was explored: 0.74-1.51 % in bottom ash, 74.05-82.70 % in electrostatic precipitator ash, 0.53-1.19 % in wet flue gas desulfurization liquid, and 0.13-0.73 % in flue gas at the stack inlet | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Arsenic adsorption capacity | |
| 650 | 4 | |a Arsenic distribution prediction model | |
| 650 | 4 | |a Fly ash | |
| 650 | 4 | |a Migration behavior | |
| 650 | 4 | |a Removal efficiency | |
| 700 | 1 | |a Zhang, Cheng |e verfasserin |4 aut | |
| 700 | 1 | |a Ma, Lun |e verfasserin |4 aut | |
| 700 | 1 | |a Yu, Shenghui |e verfasserin |4 aut | |
| 700 | 1 | |a Yuan, Changle |e verfasserin |4 aut | |
| 700 | 1 | |a Li, Junchen |e verfasserin |4 aut | |
| 700 | 1 | |a Tan, Peng |e verfasserin |4 aut | |
| 700 | 1 | |a Fang, Qingyan |e verfasserin |4 aut | |
| 700 | 1 | |a Luo, Guangqian |e verfasserin |4 aut | |
| 700 | 1 | |a Chen, Gang |e verfasserin |4 aut | |
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