Removal and recovery of SO2 and NO in oxy-fuel combustion flue gas by calcium-based slurry
This study investigates the use of calcium-based slurry for simultaneous removal NO and SO2 from oxy-fuel combustion flue gas, and recovery of the sulfur and nitrogen species in resulting solutions. The experiments were performed in a bubbling reactor in a transient mode under the pressure of 20 bar...
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| Format: | Article |
| Language: | English |
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EDP Sciences
2020-01-01
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| Series: | E3S Web of Conferences |
| Online Access: | https://www.e3s-conferences.org/articles/e3sconf/pdf/2020/54/e3sconf_icaeer2020_04062.pdf |
| _version_ | 1818428793974423552 |
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| author | Cai Yuyang Ding Xiaohan Li Wei Liu Dunyu Chen Jun Ni Mingguo Xu Kailong Jin Jing |
| author_facet | Cai Yuyang Ding Xiaohan Li Wei Liu Dunyu Chen Jun Ni Mingguo Xu Kailong Jin Jing |
| author_sort | Cai Yuyang |
| collection | DOAJ |
| description | This study investigates the use of calcium-based slurry for simultaneous removal NO and SO2 from oxy-fuel combustion flue gas, and recovery of the sulfur and nitrogen species in resulting solutions. The experiments were performed in a bubbling reactor in a transient mode under the pressure of 20 bar. The various influencing factors including the CaO amount, carrier gas (N2/CO2), and absorption time on the simultaneous NO and SO2 removal process, and the solution products were studied comprehensively. The results show that the NO2 removal efficiency can be improved by the presence of CO2, and the gas phase HNO2 produces in this process. The addition of CaO has positive effects not only on the NO2 removal efficiency but also on the formation of stable HNO3. With the presence of CO2, CaCO3 is formed in a solution initially. With the decrease of pH, CaCO3 is gradually converted to CaSO4, and in particular CaCO3 can be fully avoided through decreasing the pH of an absorption solution to 1.14. At the same time, the formation of unstable S(IV) and NO2- can be prevented when the solution pH is lower than 1.37. The nitrogen and sulfur compounds in the absorption solution (at pH 1.14) were further separated by the addition of different amounts of CaO. In particular, 95% of SO42- finally can be recovered in the form of CaSO4.2H2O with nitrogen in solution existing as NO3- by controlling the Ca/S ratio at 4.70. The effectiveness of calcium-based slurry on the removal and recovery of SO2 and NO is confirmed. |
| first_indexed | 2024-12-14T15:07:17Z |
| format | Article |
| id | doaj.art-0164ccf9a8d64c4cbc145fb61bc350d6 |
| institution | Directory Open Access Journal |
| issn | 2267-1242 |
| language | English |
| last_indexed | 2024-12-14T15:07:17Z |
| publishDate | 2020-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | E3S Web of Conferences |
| spelling | doaj.art-0164ccf9a8d64c4cbc145fb61bc350d62022-12-21T22:56:39ZengEDP SciencesE3S Web of Conferences2267-12422020-01-011940406210.1051/e3sconf/202019404062e3sconf_icaeer2020_04062Removal and recovery of SO2 and NO in oxy-fuel combustion flue gas by calcium-based slurryCai YuyangDing Xiaohan0Li WeiLiu DunyuChen JunNi MingguoXu KailongJin JingDepartment of Computer Science, George Mason University, Commonwealth of VirginiaThis study investigates the use of calcium-based slurry for simultaneous removal NO and SO2 from oxy-fuel combustion flue gas, and recovery of the sulfur and nitrogen species in resulting solutions. The experiments were performed in a bubbling reactor in a transient mode under the pressure of 20 bar. The various influencing factors including the CaO amount, carrier gas (N2/CO2), and absorption time on the simultaneous NO and SO2 removal process, and the solution products were studied comprehensively. The results show that the NO2 removal efficiency can be improved by the presence of CO2, and the gas phase HNO2 produces in this process. The addition of CaO has positive effects not only on the NO2 removal efficiency but also on the formation of stable HNO3. With the presence of CO2, CaCO3 is formed in a solution initially. With the decrease of pH, CaCO3 is gradually converted to CaSO4, and in particular CaCO3 can be fully avoided through decreasing the pH of an absorption solution to 1.14. At the same time, the formation of unstable S(IV) and NO2- can be prevented when the solution pH is lower than 1.37. The nitrogen and sulfur compounds in the absorption solution (at pH 1.14) were further separated by the addition of different amounts of CaO. In particular, 95% of SO42- finally can be recovered in the form of CaSO4.2H2O with nitrogen in solution existing as NO3- by controlling the Ca/S ratio at 4.70. The effectiveness of calcium-based slurry on the removal and recovery of SO2 and NO is confirmed.https://www.e3s-conferences.org/articles/e3sconf/pdf/2020/54/e3sconf_icaeer2020_04062.pdf |
| spellingShingle | Cai Yuyang Ding Xiaohan Li Wei Liu Dunyu Chen Jun Ni Mingguo Xu Kailong Jin Jing Removal and recovery of SO2 and NO in oxy-fuel combustion flue gas by calcium-based slurry E3S Web of Conferences |
| title | Removal and recovery of SO2 and NO in oxy-fuel combustion flue gas by calcium-based slurry |
| title_full | Removal and recovery of SO2 and NO in oxy-fuel combustion flue gas by calcium-based slurry |
| title_fullStr | Removal and recovery of SO2 and NO in oxy-fuel combustion flue gas by calcium-based slurry |
| title_full_unstemmed | Removal and recovery of SO2 and NO in oxy-fuel combustion flue gas by calcium-based slurry |
| title_short | Removal and recovery of SO2 and NO in oxy-fuel combustion flue gas by calcium-based slurry |
| title_sort | removal and recovery of so2 and no in oxy fuel combustion flue gas by calcium based slurry |
| url | https://www.e3s-conferences.org/articles/e3sconf/pdf/2020/54/e3sconf_icaeer2020_04062.pdf |
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