Application Stories

Weartech SHS: Superior Erosion and Corrosion Resistance

Weartech® SHS™ Thermal Spray Coating on Boiler Tubes
Provides Superior Erosion and Corrosion Resistance

 

PROBLEM: EROSION AND CORROSION
Waste coal is a low energy value discard that has accumulated for more than a century at anthracite and bituminous coal mines in the Northeast USA. Since the early 1990s, coal fired power plants near these mines have been configured to burn this inexpensive fuel source in circulating fluidized bed (CFB) combustion boilers.

 
For every 100 tons of waste coal burned, more than 60 tons of fly ash, containing chemicals such as mercury and sulfur, is produced along with emissions containing very fine nitrogen oxide particles. Plant operators feed limestone into the combustor to control the chemicals and introduce ammonia to reduce nitrogen oxide emissions. The result is erosion and corrosion damage that causes boiler tube failures and costly unscheduled outages.

 

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