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Power |
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NanoSteel Coating Provides Corrosion Resistance |
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on Dry Scrubber ID Chamber Wall |
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Problem: Severe Corrosion and Pitting Damage
Spray drying absorption (dry scrubber) systems remove sulphur dioxide from flue gas at fossil fuel power plants. This process occurs inside a chamber fabricated from A36 carbon steel.
As flue gas enters the chamber at 300° F, a mixture of fly ash, lime milk and cooling tower blowdown water is sprayed to absorb sulphur dioxide into alkaline droplets. As the water evaporates almost immediately, the droplets are converted to a powder which falls to the bottom of the chamber for removal.
Where spraying occurs, a combination of corrosion scale, fly ash and lime milk containing high concentrations of calcium sulfite, calcium sulfate and chlorine can build up on the ID surface of the chamber wall and cause severe corrosion and pitting damage. This damage can result in significant wall material loss and cause the chamber to buckle and fail.
Solution: NanoSteel Thermal Spray Coating
To reduce material loss inside dry scrubber chambers at a coal fired power plant in Arizona, a NanoSteel SHS 7570 TWAS thermal spray coating is applied for resisting corrosion and pitting. |
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Result: Improved Corrosion Resistance and Extended Service Life
The NanoSteel SHS 7570 TWAS thermal spray coating provides resistance to severe corrosion and pitting damage, reduces wall material loss and extends the service life of the dry scrubber chamber. |
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Additional Information
For project cost analysis, contact NanoSteel toll free at 1-877-293-6266 in the United States and Canada or 001 401 270 3549 internationally, or e-mail quote@NanoSteelco.com. |
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