富氧燃烧方式下烟气中SO_3和Hg的排放及控制研究进展
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摘要
富氧燃烧技术可有效控制温室气体排放,是一种具有应用潜力的节能减排技术。本工作系统总结分析了富氧燃烧方式下关键烟气组分(SO_x, NO_x, H_2O, Cl_2/HCl等)对SO_3和Hg排放规律的影响及飞灰对烟气中SO_3吸附去除和Hg富集规律的影响,提出了富氧燃烧方式下较优的具可行性的污染物协同控制技术建议,为富氧燃烧技术工业应用面临的污染物协同控制提供重要参考。分析了目前富氧燃烧方式下SO_3和Hg排放规律及优化控制研究存在的问题,对未来的研究方向提出了建议。要点:(1)富氧燃烧方式下烟气中SO_3和Hg浓度明显提高。烟气中SO_x, NO_x, H_2O, Cl_2/HCl及飞灰等对SO_3和Hg排放规律具有重要影响。(2)从脱硝、除尘、脱硫工艺优化方面,提出了富氧燃烧方式下具有可行性的污染物协同控制技术建议,为工业应用面临的污染物协同控制问题提供重要参考。(3)指出了未来富氧燃烧方式下SO_3和Hg排放及优化控制的研究方向,如实际工况多因素耦合作用下排放规律、烟气中污染物的协同控制规律、关键污染物的迁移规律及协同控制工艺路线优化研究。
Oxy-fuel combustion technology, an effective greenhouse gas emission control technology, is an energy conservation and emission reduction technology with potential application. In this work the effects of flue gas components(SO_x, NO_x, H_2O, Cl_2/HCl etc.) on the formation of SO_3 and Hg under oxy-fuel combustion condition, and the effects of fly ash on the adsorption and removal of SO_3 and Hg enrichment in flue gas were systematically summarized and analysed. The feasible technical suggestions for synergistic control of SO_3 and Hg under oxy-fuel combustion were put forward, which provides an important reference for the synergistic control of pollutants in the industrial application of oxy-fuel combustion. At the same time, the emission characteristics of SO_3 and Hg under the current oxy-fuel combustion and the existing problems in the research direction of optimization control were analysed, and some suggestions for the future research direction were put forward. Key learning points:(1) The SO_3 and Hg concentrations in flue gas increased significantly under oxy-fuel combustion. Flue gas components(SO_x, NO_x, H_2 O, Cl_2/HCl) and fly ash had important effects on SO_3 and Hg emissions.(2) From the aspects of optimization of denitrification, dedusting and desulfurization process, feasible technical suggestions for synergetic control of pollutants under oxy-fuel combustion were put forward, which can provide important reference for the synergetic control of pollutants faced by industrial applications.(3) The future research directions of SO_3 and Hg emission and optimization control under oxy-fuel combustion were pointed out, such as the emission law under the coupling action of multiple factors in actual working conditions, the synergetic control law of pollutants in flue gas, the migration law of key pollutants and the optimization of synergetic control process route.
Oxy-fuel combustion technology, an effective greenhouse gas emission control technology, is an energy conservation and emission reduction technology with potential application. In this work the effects of flue gas components(SO_x, NO_x, H_2O, Cl_2/HCl etc.) on the formation of SO_3 and Hg under oxy-fuel combustion condition, and the effects of fly ash on the adsorption and removal of SO_3 and Hg enrichment in flue gas were systematically summarized and analysed. The feasible technical suggestions for synergistic control of SO_3 and Hg under oxy-fuel combustion were put forward, which provides an important reference for the synergistic control of pollutants in the industrial application of oxy-fuel combustion. At the same time, the emission characteristics of SO_3 and Hg under the current oxy-fuel combustion and the existing problems in the research direction of optimization control were analysed, and some suggestions for the future research direction were put forward. Key learning points:(1) The SO_3 and Hg concentrations in flue gas increased significantly under oxy-fuel combustion. Flue gas components(SO_x, NO_x, H_2 O, Cl_2/HCl) and fly ash had important effects on SO_3 and Hg emissions.(2) From the aspects of optimization of denitrification, dedusting and desulfurization process, feasible technical suggestions for synergetic control of pollutants under oxy-fuel combustion were put forward, which can provide important reference for the synergetic control of pollutants faced by industrial applications.(3) The future research directions of SO_3 and Hg emission and optimization control under oxy-fuel combustion were pointed out, such as the emission law under the coupling action of multiple factors in actual working conditions, the synergetic control law of pollutants in flue gas, the migration law of key pollutants and the optimization of synergetic control process route.
引文
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