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Radical-Induced Oxidation Removal of Mercury by Ozone Coupled with Bromine
ACS ES&T Engineering ( IF 7.4 ) Pub Date : 2020-10-05 , DOI: 10.1021/acsestengg.0c00088 Yaning Sun 1 , Mei Deng 2 , Wenjun Huang 1 , Yongxian Zhou 2 , Yue Zhao 1 , Jisai Chen 2 , Naiqiang Yan 1 , Zan Qu 1
ACS ES&T Engineering ( IF 7.4 ) Pub Date : 2020-10-05 , DOI: 10.1021/acsestengg.0c00088 Yaning Sun 1 , Mei Deng 2 , Wenjun Huang 1 , Yongxian Zhou 2 , Yue Zhao 1 , Jisai Chen 2 , Naiqiang Yan 1 , Zan Qu 1
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Ozone oxidation and absorption is an effective technique for air pollutant removal from industrial flue gas. However, it is hard to remove Hg0 because of the competition reaction between O3 and NOx. In order to enhance the mercury removal by O3 in the presence of NO, SO2, and other flue gas components, bromine was used as the oxidation promoter in this research. The experimental data showed that the mercury removal efficiency was improved significantly when Br2 was introduced into the reaction system. The mechanism and main factors of mercury removal by O3 and Br2 were studied. The box model calculation showed that the O radical inspired the generation of Br and BrO radicals. And, the Br and BrO radicals were the key factors which enhanced the Hg0 oxidation by O3 in the presence of NO. In the full-scale experiments, mercury removal efficiency was near 90% when only 0.68 ppmv bromine was injected into the real coal-fired flue gas with 101 ppmv O3. Therefore, it is helpful through introducing bromine to enhance the mercury removal by excess ozone during the NOx removal process.
中文翻译：
臭氧与溴偶合自由基清除汞的研究
臭氧的氧化和吸收是从工业烟气中去除空气污染物的有效技术。然而，由于O 3与NOx之间的竞争反应，难以除去Hg 0。为了在存在NO，SO 2和其他烟道气成分的情况下提高O 3去除汞的能力，本研究使用溴作为氧化促进剂。实验数据表明，将Br 2引入反应体系可显着提高除汞效率。O 3和Br 2脱汞的机理及主要因素被研究了。盒模型计算表明，O自由基激发了Br和BrO自由基的产生。并且，在NO存在下，Br和BrO自由基是增强O 3氧化Hg 0的关键因素。在大规模实验中，当仅将0.68 ppmv溴注入到含101 ppmv O 3的真实燃煤烟气中时，除汞效率接近90％。因此，通过引入溴来增强在NOx去除过程中过量臭氧对汞的去除是有帮助的。
更新日期：2020-10-05
中文翻译：
臭氧与溴偶合自由基清除汞的研究
臭氧的氧化和吸收是从工业烟气中去除空气污染物的有效技术。然而，由于O 3与NOx之间的竞争反应，难以除去Hg 0。为了在存在NO，SO 2和其他烟道气成分的情况下提高O 3去除汞的能力，本研究使用溴作为氧化促进剂。实验数据表明，将Br 2引入反应体系可显着提高除汞效率。O 3和Br 2脱汞的机理及主要因素被研究了。盒模型计算表明，O自由基激发了Br和BrO自由基的产生。并且，在NO存在下，Br和BrO自由基是增强O 3氧化Hg 0的关键因素。在大规模实验中，当仅将0.68 ppmv溴注入到含101 ppmv O 3的真实燃煤烟气中时，除汞效率接近90％。因此，通过引入溴来增强在NOx去除过程中过量臭氧对汞的去除是有帮助的。
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