Yuan Peng, Ma Haofei, Shen Boxiong, Ji Zhiyong
School of Chemical Engineering & Technology, Hebei University of Technology, Tianjin 300130, PR China; Tianjin Key Laboratory of Clean Energy Utilization and Pollutants Control, School of Energy & Environmental Engineering, Hebei University of Technology, Tianjin 300401, PR China.
Tianjin Key Laboratory of Clean Energy Utilization and Pollutants Control, School of Energy & Environmental Engineering, Hebei University of Technology, Tianjin 300401, PR China.
Sci Total Environ. 2022 Feb 1;806(Pt 4):150958. doi: 10.1016/j.scitotenv.2021.150958. Epub 2021 Oct 14.
This review article provides a state-of-art insight into the removal of NO, SO and elemental mercury (Hg) from flue gas by using advanced oxidation processes (AOPs) method. Firstly, the main flue gas purification strategies based on AOPs would be classified as gas-gas, gas-liquid and gas-solid systems preliminarily, and the primary chemistry/mechanism of the above homogeneous/heterogeneous reaction systems were presented as the oxidation of NO, SO and Hg by the oxidative free radicals (OH, O and SOetc.). Secondly, the research progress and reaction pathways for separately or simultaneously removing NO, SO and Hg from flue gas by AOPs has been reviewed elaborated and analyzed in more details. Notably, the wet/dry oxidation coupled with efficient absorption process would be a promising method of efficient removal of above gaseous pollutants. Subsequently, four types of assumed layout modes were described graphically. The application prospects of AOPs for the purification of flue gas from coal-fired boiler or industrial furnace were evaluated and found that the operation cost and utilization of oxidants must be reduced and improved respectively. Finally, the limitations in the current removal technologies based on AOPs are highlighted, meanwhile the future research directions are suggested, such as cut down the cost of oxidants and catalysts, improve the yield and valid utilization of highly reactive radicals and enhance the reactivity, resistance and stability of catalysts. Significantly, it is also envisaged that the review could enrich the knowledge repository to function as a scientific reference for the sustainable development of economical, effective and environment-friendly technologies for the abatement of a wide variety of emissions from flue gas, and further improve the feasibility and reliability of the strategies for moving from laboratory studies to large-scale development and industrial application.
这篇综述文章对采用高级氧化工艺（AOPs）方法从烟气中去除一氧化氮（NO）、二氧化硫（SO）和元素汞（Hg）提供了最新的见解。首先，基于AOPs的主要烟气净化策略将初步分类为气-气、气-液和气-固系统，并介绍了上述均相/非均相反应系统的主要化学原理/机制，即氧化自由基（OH、O和SO等）对NO、SO和Hg的氧化作用。其次，对通过AOPs单独或同时去除烟气中NO、SO和Hg的研究进展及反应途径进行了更详细的阐述和分析。值得注意的是，湿式/干式氧化与高效吸收过程相结合将是一种有效去除上述气态污染物的有前景的方法。随后，以图形方式描述了四种假定的布局模式。对AOPs在燃煤锅炉或工业炉烟气净化中的应用前景进行了评估，发现必须分别降低运行成本和提高氧化剂的利用率。最后，强调了当前基于AOPs的去除技术的局限性，同时提出了未来的研究方向，如降低氧化剂和催化剂的成本、提高高活性自由基的产率和有效利用率，以及增强催化剂的反应活性、抗性和稳定性。重要的是，还设想该综述可以丰富知识库，为经济、有效和环境友好型技术的可持续发展提供科学参考，以减少烟气中的各种排放，并进一步提高从实验室研究向大规模开发和工业应用转变的策略的可行性和可靠性。
