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Simultaneous removal of SO2 and NOx from flue gas using (NH4)(2)S2O3/steel slag slurry combined with ozone oxidation
Meng, Ziheng1,2; Wang, Chenye1; Wang, Xingrui1; Chen, Yan1; Wu, Wenfen1,2; Li, Huiquan1,2
2019-11-01
Source PublicationFUEL
ISSN0016-2361
Volume255Pages:8
AbstractThe use of thiosulfate salt (S2O32-), a low-cost reductant, as an absorbent for NO2 removal has been rarely reported. In this study, we propose a method that combines ozone oxidation and (NH4)(2)S2O3/steel slag slurry spraying to simultaneously remove sulfur dioxide (SO2) and nitrogen oxides (NOx) from flue gas. We investigated the effects of operation conditions on the simultaneous removal efficiencies of SO2 and NOx. Results showed that SO2 removal efficiency was affected by pH, whereas NOx removal efficiency was mostly influenced by (NH4)(2)S2O3 concentration, reaction temperature, and pH level. Under optimal operation conditions, removal efficiencies of almost 100% for SO2 and above 78.0% for NOx were achieved. NH4+ in the steel slag slurry could tolerate high NO2- concentrations (up to 3.00 mol/L), and the co-existence of NH4+ and S2O32- had a significant synergistic effect on NOx removal. Together with S2O32-, Mg2+ that leached from the steel slag also had a synergistic effect on NO2 removal. We established the reaction mechanisms for NOx removal using (NH4)(2)S2O3/steel slag slurry. In this process, S2O32- acted as a reducing agent and an oxidation inhibitor of SO32-, thereby enhancing NO2 removal. Moreover, NH4+ inhibited the denitration product (NO2-) from decomposing into NO and NO2, thereby accelerating NOx removal.
KeywordSimultaneous removal SO2 NOx (NH4)(2)S2O3 Steel slag Reaction mechanism
DOI10.1016/j.fuel.2019.115760
Language英语
WOS KeywordSIMULTANEOUS ABSORPTION ; NITROGEN-OXIDES ; NITRIC-OXIDE ; SULFUR-DIOXIDE ; AQUEOUS-SOLUTIONS ; ELEMENTAL SULFUR ; SULFITE ; AMMONIUM ; DESULFURIZATION ; PERSULFATE
Funding ProjectYoung Scientists Fund of the National Natural Science Foundation of China[21706264] ; Science and Technology Service Network Initiative Project of the Chinese Academy of Sciences[KFJ-SW-STS-178]
WOS Research AreaEnergy & Fuels ; Engineering
WOS SubjectEnergy & Fuels ; Engineering, Chemical
Funding OrganizationYoung Scientists Fund of the National Natural Science Foundation of China ; Science and Technology Service Network Initiative Project of the Chinese Academy of Sciences
WOS IDWOS:000479141700115
PublisherELSEVIER SCI LTD
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/30620
Collection中国科学院过程工程研究所
Corresponding AuthorLi, Huiquan
Affiliation1.Chinese Acad Sci, Inst Proc Engn, CAS Key Lab Green Proc & Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Sch Chem Engn, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Meng, Ziheng,Wang, Chenye,Wang, Xingrui,et al. Simultaneous removal of SO2 and NOx from flue gas using (NH4)(2)S2O3/steel slag slurry combined with ozone oxidation[J]. FUEL,2019,255:8.
APA Meng, Ziheng,Wang, Chenye,Wang, Xingrui,Chen, Yan,Wu, Wenfen,&Li, Huiquan.(2019).Simultaneous removal of SO2 and NOx from flue gas using (NH4)(2)S2O3/steel slag slurry combined with ozone oxidation.FUEL,255,8.
MLA Meng, Ziheng,et al."Simultaneous removal of SO2 and NOx from flue gas using (NH4)(2)S2O3/steel slag slurry combined with ozone oxidation".FUEL 255(2019):8.
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