| 一种典型钒钛系SCR催化剂SO3生成特性研究 |
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| 引用本文： | 尹子骏,苏胜,卿梦霞,赵志刚,王中辉,王乐乐,江龙,汪一,胡松,向军. 一种典型钒钛系SCR催化剂SO3生成特性研究[J]. 化工学报, 2021, 72(5): 2596-2603. DOI: 10.11949/0438-1157.20201429 |
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| 作者姓名： | 尹子骏 苏胜 卿梦霞 赵志刚 王中辉 王乐乐 江龙 汪一 胡松 向军 |
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| 作者单位： | 华中科技大学煤燃烧国家重点实验室,湖北武汉430074;长沙理工大学能源与动力工程学院,湖南长沙410114;西安热工研究院有限公司苏州分公司,江苏苏州215153 |
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| 基金项目： | 国家自然科学基金项目(51976072) |
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| 摘 要： | 选择性催化还原（SCR）技术由于脱硝效率高、选择性好而被广泛应用于烟气氮氧化物排放控制；然而，目前广泛采用的钒钛系SCR脱硝催化剂会使烟气中SO2氧化成SO3，烟气中过高的SO3对电厂安全运行会造成严重影响，也会对环境造成污染。以典型V2O5-WO3/TiO2催化剂为研究对象，系统研究了SCR脱硝过程中烟气流量、温度、O2浓度、SO2浓度等对催化剂表面SO3生成特性的影响，并进一步对SO3生成的反应动力学特性进行了分析。研究表明：催化剂表面SO3生成反应中SO2的反应级数为0.59，当O2浓度大于3%时，O2的反应级数为0，该反应的表观活化能为70.39 kJ/mol；实验条件下，烟气中SO2浓度增加会使SO3生成的反应速率提高；O2浓度对催化剂表面SO3生成影响并不显著；烟气温度对催化剂表面SO3生成具有显著影响，高温会促进SO3的生成。
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| 关 键 词： | SCR催化剂 燃煤烟气 SO2 SO3 反应动力学 |
| 收稿时间： | 2020-10-12 |
Study on SO3 formation characteristics of a typical vanadium titanium SCR catalyst |
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| YIN Zijun,SU Sheng,QING Mengxia,ZHAO Zhigang,WANG Zhonghui,WANG Lele,JIANG Long,WANG Yi,HU Song,XIANG Jun. Study on SO3 formation characteristics of a typical vanadium titanium SCR catalyst[J]. Journal of Chemical Industry and Engineering(China), 2021, 72(5): 2596-2603. DOI: 10.11949/0438-1157.20201429 |
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| Authors: | YIN Zijun SU Sheng QING Mengxia ZHAO Zhigang WANG Zhonghui WANG Lele JIANG Long WANG Yi HU Song XIANG Jun |
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| Affiliation: | 1.State Key Laboratory of Coal Combustion, Huazhong University of Science & Technology, Wuhan 430074, Hubei, China;2.School of Energy and Power Engineering, Changsha University of Science & Technology, Changsha 410114, Hunan, China;3.Xi’an Thermal Power Research Institute Company Limited, Suzhou Branch, Suzhou 215153, Jiangsu, China |
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| Abstract: | Selective catalytic reduction (SCR) technology is widely used in flue gas nitrogen oxide emission control due to its high denitration efficiency and good selectivity; however, currently widely used vanadium titanium SCR catalyst can oxidize SO2 in flue gas into SO3, and excessive SO3 in flue gas will cause serious impact on the safe operation of power plant and also cause environmental pollution. Taking commercial V2O5-WO3/TiO2 catalyst as the research object, the effects of flue gas flowrate, temperature, O2 concentration and SO2 concentration on the formation of SO3 on the catalyst during SCR denitrification were systematically studied, and the reaction kinetics of SO3 formation was further discussed. The results show that the reaction order of SO2 is 0.59. When the concentration of O2 is more than 3%, the reaction order of O2 is 0, and the activation energy of SO3 formation on catalyst is 70.39 kJ/mol. The increase of SO2 concentration will increase the reaction rate of SO3 formation; O2 concentration has no significant effect on the formation of SO3 on the catalyst. The temperature of flue gas has a significant effect on the formation of SO3, and high temperature can promote the formation of SO3. |
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| Keywords: | SCR catalyst coal fired flue gas SO2 SO3 reaction kinetics |
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