Utilization of steel slag as a highly efficient absorbent for SO2 removal at coal-fired power stations
In this study, steel slag, a waste generated from steelmaking processes, was used as an absorbent for the removal of SO2 in coal-fired flue gas. The results showed that SO2 could be removed completely in the bubbling-bed reactor by the steel slag slurry under certain operating conditions. Effort was...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-10-01
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| Series: | Environmental Advances |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666765722001119 |
| _version_ | 1797987083229331456 |
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| author | Hongzhe Li Ruitang Guo Yipei Chen Gang Yang Tao Wu |
| author_facet | Hongzhe Li Ruitang Guo Yipei Chen Gang Yang Tao Wu |
| author_sort | Hongzhe Li |
| collection | DOAJ |
| description | In this study, steel slag, a waste generated from steelmaking processes, was used as an absorbent for the removal of SO2 in coal-fired flue gas. The results showed that SO2 could be removed completely in the bubbling-bed reactor by the steel slag slurry under certain operating conditions. Effort was then made to study the kinetics of SO2 absorption in steel slag slurry. It is found that the gas-liquid absorption model fits well with the experimental data and can be used to predict the SO2 absorption process. Results also demonstrated that the maximum SO2 uptake capacity of steel slag reaches 0.68 g, which is about 36 wt% higher than that of the traditional limestone-gypsum desulfurization process under similar conditions, while the SO2 breakthrough time reaches the maximum of 951 min under a flow rate of 420 mL/min, an initial SO2 concentration of 700 ppm, and a solid-liquid ratio of 1.5 g/100 mL. Moreover, it was found that SO42−, was the main anions detected in the liquid phase after desulphurization and the pH of the solution decreased from 12.9 to 3.2. This study proved that steel slag is of the potential to replace limestone in the wet flue gas desulfurization process, which contributes to the mitigation of global CO2 emissions and solves environmental problems associated with the disposal of steel slag. |
| first_indexed | 2024-04-11T07:43:22Z |
| format | Article |
| id | doaj.art-cd1d0db2f1764f96aa36269f6b086568 |
| institution | Directory Open Access Journal |
| issn | 2666-7657 |
| language | English |
| last_indexed | 2024-04-11T07:43:22Z |
| publishDate | 2022-10-01 |
| publisher | Elsevier |
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| series | Environmental Advances |
| spelling | doaj.art-cd1d0db2f1764f96aa36269f6b0865682022-12-22T04:36:25ZengElsevierEnvironmental Advances2666-76572022-10-019100276Utilization of steel slag as a highly efficient absorbent for SO2 removal at coal-fired power stationsHongzhe Li0Ruitang Guo1Yipei Chen2Gang Yang3Tao Wu4Department of Thermal Engineering, Shanghai University of Electric Power, Shanghai 200090, China; New Materials Institute, University of Nottingham Ningbo China, Ningbo 315100, ChinaDepartment of Thermal Engineering, Shanghai University of Electric Power, Shanghai 200090, China; Corresponding author.New Materials Institute, University of Nottingham Ningbo China, Ningbo 315100, China; Key Laboratory of Carbonaceous Wastes Processing and Process Intensification of Zhejiang Province, University of Nottingham Ningbo China, Ningbo 315100, ChinaNew Materials Institute, University of Nottingham Ningbo China, Ningbo 315100, China; Key Laboratory of Carbonaceous Wastes Processing and Process Intensification of Zhejiang Province, University of Nottingham Ningbo China, Ningbo 315100, ChinaNew Materials Institute, University of Nottingham Ningbo China, Ningbo 315100, China; Key Laboratory of Carbonaceous Wastes Processing and Process Intensification of Zhejiang Province, University of Nottingham Ningbo China, Ningbo 315100, China; Corresponding author at: New Materials Institute, University of Nottingham Ningbo China, Ningbo 315100, China.In this study, steel slag, a waste generated from steelmaking processes, was used as an absorbent for the removal of SO2 in coal-fired flue gas. The results showed that SO2 could be removed completely in the bubbling-bed reactor by the steel slag slurry under certain operating conditions. Effort was then made to study the kinetics of SO2 absorption in steel slag slurry. It is found that the gas-liquid absorption model fits well with the experimental data and can be used to predict the SO2 absorption process. Results also demonstrated that the maximum SO2 uptake capacity of steel slag reaches 0.68 g, which is about 36 wt% higher than that of the traditional limestone-gypsum desulfurization process under similar conditions, while the SO2 breakthrough time reaches the maximum of 951 min under a flow rate of 420 mL/min, an initial SO2 concentration of 700 ppm, and a solid-liquid ratio of 1.5 g/100 mL. Moreover, it was found that SO42−, was the main anions detected in the liquid phase after desulphurization and the pH of the solution decreased from 12.9 to 3.2. This study proved that steel slag is of the potential to replace limestone in the wet flue gas desulfurization process, which contributes to the mitigation of global CO2 emissions and solves environmental problems associated with the disposal of steel slag.http://www.sciencedirect.com/science/article/pii/S2666765722001119Coal-fired power generationWet flue gas desulphurizationSO2 absorptionSteel slag, Industrial waste utilization |
| spellingShingle | Hongzhe Li Ruitang Guo Yipei Chen Gang Yang Tao Wu Utilization of steel slag as a highly efficient absorbent for SO2 removal at coal-fired power stations Environmental Advances Coal-fired power generation Wet flue gas desulphurization SO2 absorption Steel slag, Industrial waste utilization |
| title | Utilization of steel slag as a highly efficient absorbent for SO2 removal at coal-fired power stations |
| title_full | Utilization of steel slag as a highly efficient absorbent for SO2 removal at coal-fired power stations |
| title_fullStr | Utilization of steel slag as a highly efficient absorbent for SO2 removal at coal-fired power stations |
| title_full_unstemmed | Utilization of steel slag as a highly efficient absorbent for SO2 removal at coal-fired power stations |
| title_short | Utilization of steel slag as a highly efficient absorbent for SO2 removal at coal-fired power stations |
| title_sort | utilization of steel slag as a highly efficient absorbent for so2 removal at coal fired power stations |
| topic | Coal-fired power generation Wet flue gas desulphurization SO2 absorption Steel slag, Industrial waste utilization |
| url | http://www.sciencedirect.com/science/article/pii/S2666765722001119 |
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