Achievements introduction:

SCR denitrification catalysts are widely used for coal-fired flue gas denitrification. The activity of the catalyst gradually decreases during operation. The main reasons include the following aspects: wear of fly ash, covering and clogging of fly ash and ammonium salts, high temperature sintering, alkali metal and alkaline earth metal poisoning. Catalyst passes through 2~After 3 years of operation, its activity will generally decrease to the point where it cannot meet the operating needs, and at this time, the catalyst often needs to be replaced. The replaced catalyst belongs to hazardous waste and needs to be treated, requiring a large treatment cost. Regarding the catalyst, the poisoning mechanism is analyzed, and on this basis, regeneration methods are proposed. Treatment methods such as water washing, acid washing, ultrasonic treatment, soaking in treatment liquid, and reloading of the catalyst are proposed.

Results Advantages:

Regeneration of the catalyst allows hazardous waste to be reused, which can greatly reduce the operating cost of the catalyst and at the same time reduce the impact of the catalyst on the environment. This technology has important economic value and environmental significance. The current new nitrogen oxide emission standards require all power plants to install SCR reaction systems in the next few years, and the replaced catalyst is in great demand and has a wide application market.

Application prospects:

After regeneration, the activity of the catalyst can be restored to 92%, meeting the needs of actual operation and greatly improving its usability.