GEESCO
Dry Ice On-Line Cleaning System
A technology that regenerates poisoned DeNOx catalysts by cleaning them on-site using dry ice.
| Item | Chemical Regeneration | Catalyst Regeneration System (GCRS) |
|---|---|---|
| Regeneration Conditions |
• Removes surface contaminants on the catalyst layer using cleaning agents such as sulfuric acid solution, reapplies damaged catalyst material, then dries and calcines to regenerate the catalyst • Catalysts must be removed from the facility and regenerated through external processing |
• Without removing catalysts from the DeNOx facility (SCR), dry ice pellets are sprayed onto the poisoned catalyst layer to remove contaminants |
| Regeneration Time | • 25 days (based on one 500MW unit) | • 5 days (based on one 500MW unit) |
| Cleaning Medium | • Cleaning agent: chemical solution containing sulfuric acid | • Cleaning agent: dry ice pellets + steam + α |
| Advantages | • Most commercialized technology worldwide |
• Catalyst regeneration possible during operation • No emission of pollutants • No catalyst removal required during on-line regeneration (minimizing performance loss) |
| Disadvantages |
• Only possible during plant shutdown • Large volumes of chemical waste generated and requires costly treatment • Ceramic substrate of catalysts may be damaged during chemical regeneration |
• Extensive ongoing research worldwide • Commercialized in 2014 by Steag (EVONIK), Germany (for catalyst clog removal) |