{"title":"在旋转填料床中活化过硫酸盐水去除模拟烟气中的一氧化氮","authors":"Da Guo, Guisheng Qi, Dong Chen, Jiabao Niu, Youzhi Liu, Weizhou Jiao","doi":"10.1007/s11705-022-2224-5","DOIUrl":null,"url":null,"abstract":"<div><p>Nitric oxide being a major gas pollutant has attracted much attention and various technologies have been developed to reduce NO emission to preserve the environment. Advanced persulfate oxidation technology is a workable and effective choice for wet flue gas denitrification due to its high efficiency and green advantages. However, NO absorption rate is limited and affected by mass transfer limitation of NO and aqueous persulfate in traditional reactors. In this study, a rotating packed bed (RPB) was employed as a gas—liquid absorption device to elevate the NO removal efficiency (<i>η</i><sub>NO</sub>) by aqueous persulfate ((NH<sub>4</sub>)<sub>2</sub>S<sub>2</sub>O<sub>8</sub>) activated by ferrous ethylenediaminetetraacetate (Fe<sup>2+</sup>-EDTA). The experimental results regarding the NO absorption were obtained by investigating the effect of various operating parameters on the removal efficiency of NO in RPB. Increasing the concentration of (NH<sub>4</sub>)<sub>2</sub>S<sub>2</sub>O<sub>8</sub> and liquid—gas ratio could promoted the oxidation and absorption of NO while the <i>η</i><sub>NO</sub> decreased with the increase of the gas flow and NO concentration. In addition, improving the high gravity factor increased the <i>η</i><sub>NO</sub> and the total volumetric mass transfer coefficient (<i>K</i><sub>G</sub><i>α</i>) which raise the <i>η</i><sub>NO</sub> up to more than 75% under the investigated system. These observations proved that the RPB can enhance the gas—liquid mass transfer process in NO absorption. The correlation formula between <i>K</i><sub>G</sub><i>α</i> and the influencing factors was determined by regression calculation, which is used to guide the industrial scale-up application of the system in NO removal. The presence of O<sub>2</sub> also had a negative effect on the NO removal process and through electron spin resonance spectrometer detection and product analysis, it was revealed that Fe<sup>2+</sup>-EDTA activated (NH<sub>4</sub>)<sub>2</sub>S<sub>2</sub>O<sub>8</sub> to produce •SO<span>\n <sup>−</sup><sub>4</sub>\n \n </span>, •OH and •O<span>\n <sup>−</sup><sub>2</sub>\n \n </span>, played a leading role in the oxidation of NO, to produce NO<span>\n <sup>−</sup><sub>3</sub>\n \n </span> as the final product. The obtained results demonstrated a good applicable potential of RPB/PS/Fe<sup>2+</sup>-EDTA in the removal of NO from flue gases.</p><figure><div><div><div><picture><source><img></source></picture></div></div></div></figure></div>","PeriodicalId":571,"journal":{"name":"Frontiers of Chemical Science and Engineering","volume":"17 4","pages":"460 - 469"},"PeriodicalIF":4.3000,"publicationDate":"2023-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"3","resultStr":"{\"title\":\"Removal of nitric oxide from simulated flue gas using aqueous persulfate with activation of ferrous ethylenediaminetetraacetate in the rotating packed bed\",\"authors\":\"Da Guo, Guisheng Qi, Dong Chen, Jiabao Niu, Youzhi Liu, Weizhou Jiao\",\"doi\":\"10.1007/s11705-022-2224-5\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Nitric oxide being a major gas pollutant has attracted much attention and various technologies have been developed to reduce NO emission to preserve the environment. Advanced persulfate oxidation technology is a workable and effective choice for wet flue gas denitrification due to its high efficiency and green advantages. However, NO absorption rate is limited and affected by mass transfer limitation of NO and aqueous persulfate in traditional reactors. In this study, a rotating packed bed (RPB) was employed as a gas—liquid absorption device to elevate the NO removal efficiency (<i>η</i><sub>NO</sub>) by aqueous persulfate ((NH<sub>4</sub>)<sub>2</sub>S<sub>2</sub>O<sub>8</sub>) activated by ferrous ethylenediaminetetraacetate (Fe<sup>2+</sup>-EDTA). The experimental results regarding the NO absorption were obtained by investigating the effect of various operating parameters on the removal efficiency of NO in RPB. Increasing the concentration of (NH<sub>4</sub>)<sub>2</sub>S<sub>2</sub>O<sub>8</sub> and liquid—gas ratio could promoted the oxidation and absorption of NO while the <i>η</i><sub>NO</sub> decreased with the increase of the gas flow and NO concentration. In addition, improving the high gravity factor increased the <i>η</i><sub>NO</sub> and the total volumetric mass transfer coefficient (<i>K</i><sub>G</sub><i>α</i>) which raise the <i>η</i><sub>NO</sub> up to more than 75% under the investigated system. These observations proved that the RPB can enhance the gas—liquid mass transfer process in NO absorption. The correlation formula between <i>K</i><sub>G</sub><i>α</i> and the influencing factors was determined by regression calculation, which is used to guide the industrial scale-up application of the system in NO removal. The presence of O<sub>2</sub> also had a negative effect on the NO removal process and through electron spin resonance spectrometer detection and product analysis, it was revealed that Fe<sup>2+</sup>-EDTA activated (NH<sub>4</sub>)<sub>2</sub>S<sub>2</sub>O<sub>8</sub> to produce •SO<span>\\n <sup>−</sup><sub>4</sub>\\n \\n </span>, •OH and •O<span>\\n <sup>−</sup><sub>2</sub>\\n \\n </span>, played a leading role in the oxidation of NO, to produce NO<span>\\n <sup>−</sup><sub>3</sub>\\n \\n </span> as the final product. The obtained results demonstrated a good applicable potential of RPB/PS/Fe<sup>2+</sup>-EDTA in the removal of NO from flue gases.</p><figure><div><div><div><picture><source><img></source></picture></div></div></div></figure></div>\",\"PeriodicalId\":571,\"journal\":{\"name\":\"Frontiers of Chemical Science and Engineering\",\"volume\":\"17 4\",\"pages\":\"460 - 469\"},\"PeriodicalIF\":4.3000,\"publicationDate\":\"2023-01-13\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"3\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Frontiers of Chemical Science and Engineering\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s11705-022-2224-5\",\"RegionNum\":3,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ENGINEERING, CHEMICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Frontiers of Chemical Science and Engineering","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s11705-022-2224-5","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
Removal of nitric oxide from simulated flue gas using aqueous persulfate with activation of ferrous ethylenediaminetetraacetate in the rotating packed bed
Nitric oxide being a major gas pollutant has attracted much attention and various technologies have been developed to reduce NO emission to preserve the environment. Advanced persulfate oxidation technology is a workable and effective choice for wet flue gas denitrification due to its high efficiency and green advantages. However, NO absorption rate is limited and affected by mass transfer limitation of NO and aqueous persulfate in traditional reactors. In this study, a rotating packed bed (RPB) was employed as a gas—liquid absorption device to elevate the NO removal efficiency (ηNO) by aqueous persulfate ((NH4)2S2O8) activated by ferrous ethylenediaminetetraacetate (Fe2+-EDTA). The experimental results regarding the NO absorption were obtained by investigating the effect of various operating parameters on the removal efficiency of NO in RPB. Increasing the concentration of (NH4)2S2O8 and liquid—gas ratio could promoted the oxidation and absorption of NO while the ηNO decreased with the increase of the gas flow and NO concentration. In addition, improving the high gravity factor increased the ηNO and the total volumetric mass transfer coefficient (KGα) which raise the ηNO up to more than 75% under the investigated system. These observations proved that the RPB can enhance the gas—liquid mass transfer process in NO absorption. The correlation formula between KGα and the influencing factors was determined by regression calculation, which is used to guide the industrial scale-up application of the system in NO removal. The presence of O2 also had a negative effect on the NO removal process and through electron spin resonance spectrometer detection and product analysis, it was revealed that Fe2+-EDTA activated (NH4)2S2O8 to produce •SO−4, •OH and •O−2, played a leading role in the oxidation of NO, to produce NO−3 as the final product. The obtained results demonstrated a good applicable potential of RPB/PS/Fe2+-EDTA in the removal of NO from flue gases.
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Frontiers of Chemical Science and Engineering presents the latest developments in chemical science and engineering, emphasizing emerging and multidisciplinary fields and international trends in research and development. The journal promotes communication and exchange between scientists all over the world. The contents include original reviews, research papers and short communications. Coverage includes catalysis and reaction engineering, clean energy, functional material, nanotechnology and nanoscience, biomaterials and biotechnology, particle technology and multiphase processing, separation science and technology, sustainable technologies and green processing.
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