造成SCR脱硝催化剂失活的关键物质及预防

对引起燃煤电厂SCR脱硝催化剂失活的主要物质进行了分类总结。分析发现,烟气中亚微米颗粒物数目众多且粒径细小,碱金属、碱土金属和重金属等能引起催化剂化学失活的有毒物质易于富集在亚微米颗粒物上; 亚微米颗粒物沉积在催化剂表面,引起催化剂中毒及催化剂孔道堵塞,成为催化剂失活的关键影响因素。为减缓SCR脱硝催化剂由此产生的失活问题,介绍了团聚技术及抗中毒催化剂的相关研发。

The Key Substances Causing SCR Denitration Catalyst Deactivation and the Preventive Measures

The essential substances causing deactivation of SCR catalysts in coal fired power plant are summarized and classified. Based on the analysis, it is found that the submicron particles are multitudinous with small pore sizes in the flue gas. Those toxic substances are blamed for the cause of catalyst deactivation, such as alkali metals, alkaline-earth metals and heavy metals, which tend to deposit on the surface of the submicron particles. Therefore, when the submicron particles accumulate on the surface of the catalyst, the consequential poisoning and passage blocking then become the major cause of catalyst deactivation. Finally, the research and development of agglomeration technology and poisoning-resistant catalyst are introduced for deactivation alleviation.