废旧脱硝催化剂再生工艺及工程案例
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摘要
脱硝催化剂在火电厂SCR脱硝技术中占据重要比重,不仅加装的费用占总投资的近40%,且催化剂性能的好坏直接影响脱硝的效率。本文系统综述了催化剂中毒失活的物理及化学机制、再生方法及工艺,并结合大唐南京环保科技有限责任公司SCR脱硝催化剂再生项目,详细介绍了再生工艺流程在实际工程的应用,经测试,再生后的催化剂各项性能(如元素含量、比表面积、活性K值、SO_2/SO_3转化率等)均得到明显恢复,且达到了火电厂使用要求,该项目的成功应用对于脱硝催化剂使用寿命的延长及再生工艺的制定具有重要的指导意义。
Denitrification catalyst occupies an important proportion in SCR denitrification technology of thermal power plant. Not only does the cost of installation account for nearly 40% of the total investment,but also the performance of catalyst directly affects the efficiency of denitrification. In this paper,the physical and chemical mechanism of catalyst poisoning and deactivation,regeneration methods and processes are systematically reviewed. Combining with SCR denitrification catalyst regeneration project of Datang Nanjing Environmental Protection Technology Co.,Ltd.,the application of regeneration process in practical engineering is introduced in detail. After testing,the properties of regenerated catalyst(such as element content,specific surface area,active K value,SO_2/SO_3 conversion rate) are tested. The successful application of this project has important guiding significance for the extension of the service life of denitrification catalyst and the formulation of regeneration process.
Denitrification catalyst occupies an important proportion in SCR denitrification technology of thermal power plant. Not only does the cost of installation account for nearly 40% of the total investment,but also the performance of catalyst directly affects the efficiency of denitrification. In this paper,the physical and chemical mechanism of catalyst poisoning and deactivation,regeneration methods and processes are systematically reviewed. Combining with SCR denitrification catalyst regeneration project of Datang Nanjing Environmental Protection Technology Co.,Ltd.,the application of regeneration process in practical engineering is introduced in detail. After testing,the properties of regenerated catalyst(such as element content,specific surface area,active K value,SO_2/SO_3 conversion rate) are tested. The successful application of this project has important guiding significance for the extension of the service life of denitrification catalyst and the formulation of regeneration process.
引文
[1]郝吉明,王书肖,陆永琪.燃煤二氧化硫污染控制技术手册[M].北京:化学工业出版社,2001.
[2]中华人民共和国环境保护部.2010年中国环境统计年报[Z].中华人民共和国环境保护部,2011.
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[4]郭斌,廖宏楷,徐程宏,等.我国SCR脱硝成本分析及脱硝电价政策探讨[J].热能动力工程,2010,25(4):437-440.
[5]Zheng Y,Jensen A D,Johnsson J E.Laboratory investigation of selective catalytic reduction catalysts:Deactivation by potassium compounds and catalyst generation[J].Industrial & Engineering Chemistry Research,2004,43(4):941-947.
[6]国家环境保护新标准发布:《规划环境影响评价技术导则总纲》 2014年9 月1日起实施[J].纸和造纸,2014(9):73.
[7]程华.SCR烟气脱硝催化剂失活原因与再生技术的研究[D].广州:华南理工大学,2013.
[8]强华松,刘清才.燃煤电厂SCR脱硝催化剂的失活与再生[J].材料导报,2008(S3):285-287.
[9]Zheng Y,Jensen A D,Johnsson J E,et al.Deactivation of V2O5-WO3-TiO2 SCR catalyst at biomass fired power plants:Elucidation of mechanisms by lab and pilot scale experiments[J].Applied Catalysis B:Environmental,2008,83(3-4):186-194.
[10]Chen J P,Yang R T.Mechanism of poisoning of the V2O5/TiO2 catalyst for the reduction of NO by NH3[J].Journal of Catalysis,1990,125(2):411-420.
[11]Larsson A,Einvall J,Andersson A,et al.Targeting by comparison with laboratory experiments the SCR catalyst deactivation process by potassium and zinc salts in a large scale biomass combustion boiler[J].Energy & Fuels,2006,20(4):1398-1405.
[12]Ben son S A,Laum b J D,Crocker C R,et al.SCR catalyst performance in flue gases derived from subbituminous and lignite coals[J].Fuel Processing Technology,2005,86(5):577-613 .
[13]Chen J P,Buzanowski M A,Yang R T,et al.Deactivation of the vanadia catalyst in the selective catalytic reduction process[J].Journal of the Air & Waste Management Association,1990,40 (10):1403-1409.
[14]Kamata H,Takahashi K,Odenbrand Cui.The role of K2O in the selective reduction of NO with NH3 over a V2O5-WO3/TiO2 commercial selective catalytic reduction catalyst[J].Journal of Molecular Catalysis A:Chemical,1999(139):189-198.
[15]白向飞,李文华,陈亚飞,等.中国煤中微量元素分布基本特征[J].煤质技术,2007(1):1-4.
[16]Senior C L,Lignell D O,Sarofima A F,et al.Modeling arsenic partitioning in coal fired power plants[J].Combustion and Flame,2006(147):209-221.
[2]中华人民共和国环境保护部.2010年中国环境统计年报[Z].中华人民共和国环境保护部,2011.
[3]Pio F.Present status and perspectives in de-NOx SCR catalysis[J].Applied Catalysis A:General,2001,222(1-2):221-236.
[4]郭斌,廖宏楷,徐程宏,等.我国SCR脱硝成本分析及脱硝电价政策探讨[J].热能动力工程,2010,25(4):437-440.
[5]Zheng Y,Jensen A D,Johnsson J E.Laboratory investigation of selective catalytic reduction catalysts:Deactivation by potassium compounds and catalyst generation[J].Industrial & Engineering Chemistry Research,2004,43(4):941-947.
[6]国家环境保护新标准发布:《规划环境影响评价技术导则总纲》 2014年9 月1日起实施[J].纸和造纸,2014(9):73.
[7]程华.SCR烟气脱硝催化剂失活原因与再生技术的研究[D].广州:华南理工大学,2013.
[8]强华松,刘清才.燃煤电厂SCR脱硝催化剂的失活与再生[J].材料导报,2008(S3):285-287.
[9]Zheng Y,Jensen A D,Johnsson J E,et al.Deactivation of V2O5-WO3-TiO2 SCR catalyst at biomass fired power plants:Elucidation of mechanisms by lab and pilot scale experiments[J].Applied Catalysis B:Environmental,2008,83(3-4):186-194.
[10]Chen J P,Yang R T.Mechanism of poisoning of the V2O5/TiO2 catalyst for the reduction of NO by NH3[J].Journal of Catalysis,1990,125(2):411-420.
[11]Larsson A,Einvall J,Andersson A,et al.Targeting by comparison with laboratory experiments the SCR catalyst deactivation process by potassium and zinc salts in a large scale biomass combustion boiler[J].Energy & Fuels,2006,20(4):1398-1405.
[12]Ben son S A,Laum b J D,Crocker C R,et al.SCR catalyst performance in flue gases derived from subbituminous and lignite coals[J].Fuel Processing Technology,2005,86(5):577-613 .
[13]Chen J P,Buzanowski M A,Yang R T,et al.Deactivation of the vanadia catalyst in the selective catalytic reduction process[J].Journal of the Air & Waste Management Association,1990,40 (10):1403-1409.
[14]Kamata H,Takahashi K,Odenbrand Cui.The role of K2O in the selective reduction of NO with NH3 over a V2O5-WO3/TiO2 commercial selective catalytic reduction catalyst[J].Journal of Molecular Catalysis A:Chemical,1999(139):189-198.
[15]白向飞,李文华,陈亚飞,等.中国煤中微量元素分布基本特征[J].煤质技术,2007(1):1-4.
[16]Senior C L,Lignell D O,Sarofima A F,et al.Modeling arsenic partitioning in coal fired power plants[J].Combustion and Flame,2006(147):209-221.