基于Cl自由基注入的煤富氧燃烧烟气Hg高效脱除实验研究

项目名称： 基于Cl自由基注入的煤富氧燃烧烟气Hg高效脱除实验研究

项目编号： No.51306064

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 能源与动力工程

项目作者： 吴辉

作者单位： 华中科技大学

项目金额： 25万元

中文摘要： 燃煤是我国最大的人为汞排放源。煤富氧燃烧技术因具有同时脱除CO2、NOx、SO2 等多种燃煤污染物的潜力而成为研究热点。富氧燃烧CO2压缩过程中，Hg由于其对铝合金换热器的低温脆化和腐蚀作用，需在CO2压缩前高效率脱除。Hg脱除的核心是Hg0的高效氧化。本项目提出一种基于Cl自由基注入的Hg0高效氧化脱除思路，拟通过实验和模拟研究，揭示高浓度Cl自由基的产生及输运机理，分析煤富氧燃烧烟气组分对Cl自由基定向氧化Hg0的影响，探讨NO及SO2脱除过程对Hg0氧化脱除过程的影响规律，揭示Hg、NO和SO2污染物间的协同脱除及相互影响机制，耦合Hg、NO、SO2的脱除过程，实现Hg的高效氧化与NO/SO2一体化脱除，以期为煤富氧燃烧烟气净化奠定理论基础；同时深入分析脱除产物中Hg的分布及形态，为Hg的最终脱除确定合理归宿。

中文关键词： 煤富氧燃烧；汞；Cl自由基；低温等离子体；湿法脱硫

英文摘要： Coal combustion is the main anthropogenic mercury emission source in China. Oxy-coal combustion technology is undergoing rapid development as a potential multipollutant control technology for simultaneously controlling of CO2, NOx and SOx from fossil fuel-fired power plants. However, mercury may cause liquid metal embrittlement and material failure of aluminum (Al) heat exchangers during CO2 compression process. Therefore, it must be high-efficiently removed before CO2 compression. However, mercury removal was determined by the Hg0 oxidation. Based on the fact that Hg0 can be effectively oxidized by Cl free radicals, this project is to conduct a systematic research on fundamental understanding about the generation and transportation of high concentration Cl free radicals. The influences of flue gas components, as well as the interaction mechanism between NO and SO2 removal by O3 and OH radicals versus Hg0(g) oxidation by Cl radicals will be investigated in detail. Hg compounds in products will be analyzed and tested in order to reveal the oxidation path and fate of Hg.

英文关键词： Oxy-coal combustion；mercury；Cl radicals；non-thermal plasma；WFGD