电力科技与环保2025，Vol.41Issue(3)：413-425,13.DOI:10.19944/j.eptep.1674-8069.2025.03.007
脱硝催化剂再生废水特征与循环利用技术研究
Research on the characteristics and recycling technology of regenerated wastewater from denitrification catalyst
摘要
Abstract
[Objective]To elucidate the indicators of harmful metal ions in wastewater discharge and reuse,and to provide superior solutions for the recycling of wastewater from the regeneration of waste catalysts,this paper systematically studied the ultrasonic wastewater and acid washing wastewater generated during the regeneration process of waste denitration catalysts at a coal-fired power plant.[Methods]By continuously washing the waste catalyst module,the main characteristics and component features of the ultrasonic and acid washing wastewater produced during the regeneration process of waste catalysts were identified.[Results]After cleaning 25 catalyst modules,the concentrations of various metal ions in the cleaning solution reach adsorption-dissolution equilibrium at the solid-liquid interface.Cleaning efficacy noticeably decreases after cleaning over 80 catalyst modules,also contaminating catalysts with minor chemical poisoning.The impregnation method was employed to simulate the poisoning of new denitration catalysts,and the study explored the accumulation patterns of metal ions in wastewater and the adsorption rules of harmful metal ions on the surface of the catalyst,investigating the correlation between the content of metal ions adsorbed on the surface of the poisoned catalyst and the denitrification efficiency of the catalyst.In the solution,when the Fe ion concentration exceeds 1.0%,the catalyst's denitrification efficiency decreases to around 50%and remains almost unchanged.When the Cr ion concentration in the solution increases from 1.0%to 3.0%,the catalyst's denitrification efficiency gradually increases and then stabilizes.[Conclusion]Therefore,the impact of Fe and Cr elements in the regenerated wastewater on the catalyst's denitrification efficiency is almost negligible.When the concentrations of K,Na,Ca,Pb,Hg,and As respectively reach 0.700%,0.500%-0.600%,0.100%,0.045%,0.400%-0.500%and 0.020%,it becomes necessary to promptly desalinate or treat ultrasonic and acid-washing wastewater to ensure effective regeneration and activation of the catalysts.关键词
燃煤电厂/废脱硝催化剂/再生废水/中毒元素/循环利用Key words
coal-fired power plants/waste denitration catalyst/regenerated wastewater/poisoning element/recycling分类
能源与动力引用本文复制引用
杨建辉,李含,程茜,周梅,赵建新,徐光辉,俞润炜..脱硝催化剂再生废水特征与循环利用技术研究[J].电力科技与环保,2025,41(3):413-425,13.基金项目
国家能源集团科技创新项目(GJNY-20-197-2) （GJNY-20-197-2）
