Regeneration and application of denitrification catalysts
Publishdate：2020-11-09 Views：15
Regeneration and application of denitrification catalysts
1. Catalyst regeneration analysis
Understand the design life and initial performance, operating time and conditions of failed catalysts, understand the specific causes of catalyst failure, and conduct further physical chemical chemical test chamber analysis on catalyst blocks, and conduct EDX analysis/XRF/SEM/TGA/BET. Determine the degree of deactivation of the failed SCR catalyst.
2. Pre treatment of passivated SCR catalyst
1. Send the modules to be processed into an automatic cleaning box, spray them with high-pressure water automatically, and then enter the manual cleaning box for advanced manual cleaning to remove ash blockages in the catalyst channel.
2. After recognition by the automatic spraying and manual cleaning modules, the subsequent process is determined based on whether the catalyst monomer in the catalyst module can be recovered.
Denitration catalyst
Denitration catalyst
3. Recycling
1. Deep cleaning of renewable modules, using special cleaning solutions for cleaning, and using surfactants, emulsifiers, chelating agents, and other components from the special cleaning solution to clean the ash in the spent catalyst module. This part of the ash content is removed. The active ingredients in the reagent combine to form a precipitate, which is discharged together with the cleaning solution and wastewater, and then manually cleaned again to completely remove the ash blocking the catalyst surface.
2. Ultrasonic cleaning, deep cleaning of waste catalyst holes.
3. Acid cleaning: When operating in a denitrification system, the catalyst needs to maintain a certain acid position to better react with nitrogen dioxide. During use, the catalyst may be poisoned by alkali metals such as potassium and sodium. Therefore, it is necessary to clean the catalyst with an acid solution to completely remove the alkaline substances in the catalyst pores and ensure that the acid position of the catalyst meets the activity requirements.
After deep cleaning, the catalyst cleaning module can completely remove impurities such as dust. Adjust the activity in the catalyst module by adding oxalate vanadium oxide solution to meet the requirements of the SCR denitrification system. Then enter the drying room, control the drying temperature at 70oC, and remove the water carried out during the cleaning process as water vapor.
The regeneration and utilization of deactivated SCR denitrification catalysts mainly include the following steps: pre cleaning - regeneration analysis - deep cleaning - addition of active substances - drying
Regeneration and application of denitrification catalysts
1. Catalyst regeneration analysis
Understand the design life and initial performance, operating time and conditions of failed catalysts, understand the specific causes of catalyst failure, and conduct further physical chemical chemical test chamber analysis on catalyst blocks, and conduct EDX analysis/XRF/SEM/TGA/BET. Determine the degree of deactivation of the failed SCR catalyst.
2. Pre treatment of passivated SCR catalyst
1. Send the modules to be processed into an automatic cleaning box, spray them with high-pressure water automatically, and then enter the manual cleaning box for advanced manual cleaning to remove ash blockages in the catalyst channel.
2. After recognition by the automatic spraying and manual cleaning modules, the subsequent process is determined based on whether the catalyst monomer in the catalyst module can be recovered.
Denitration catalyst
Denitration catalyst
3. Recycling
1. Deep cleaning of renewable modules, using special cleaning solutions for cleaning, and using surfactants, emulsifiers, chelating agents, and other components from the special cleaning solution to clean the ash in the spent catalyst module. This part of the ash content is removed. The active ingredients in the reagent combine to form a precipitate, which is discharged together with the cleaning solution and wastewater, and then manually cleaned again to completely remove the ash blocking the catalyst surface.
2. Ultrasonic cleaning, deep cleaning of waste catalyst holes.
3. Acid cleaning: When operating in a denitrification system, the catalyst needs to maintain a certain acid position to better react with nitrogen dioxide. During use, the catalyst may be poisoned by alkali metals such as potassium and sodium. Therefore, it is necessary to clean the catalyst with an acid solution to completely remove the alkaline substances in the catalyst pores and ensure that the acid position of the catalyst meets the activity requirements.
After deep cleaning, the catalyst cleaning module can completely remove impurities such as dust. Adjust the activity in the catalyst module by adding oxalate vanadium oxide solution to meet the requirements of the SCR denitrification system. Then enter the drying room, control the drying temperature at 70oC, and remove the water carried out during the cleaning process as water vapor.
The regeneration and utilization of deactivated SCR denitrification catalysts mainly include the following steps: pre cleaning - regeneration analysis - deep cleaning - addition of active substances - drying
