GEESCO
Dry Ice On-Line Cleaning System
A technology that removes yellow plume in combined-cycle power plants using low-temperature DeNOx catalysts and a plasma urea vaporization system.
| Item | Ethanol injection | Plasma Urea Vaporization System (PUV) |
|---|---|---|
| Operating Conditions |
• After gas turbine startup, when exhaust gas temperature reaches approx. 120℃, ethanol is injected to remove yellow plume. |
• During gas turbine startup, when exhaust gas temperature reaches approx. 120℃, ammonia is injected into the DeNOx catalyst to decompose yellow plume (NO₂). |
| Operating Time | • Requires additional yellow-plume removal equipment. | • Utilizes the existing reductant already installed in the SCR system. |
| Additional Equipment | • Must be installed separately from the SCR system. | • Only partial modification of the vaporizer for SCR is required. |
| Advantages | • Can be used in gas turbine power plants without an SCR system. |
• Very low additional cost when SCR is already installed • Extremely low operating cost as the SCR reductant is used • No emission of pollutants |
| Disadvantages |
• Releases semi-treated formaldehyde • Very high reductant cost |
• Cannot be used in gas turbine power plants without an SCR system |