18
Design Considerations Continued
lHigh
Sulfur Fuels
–SCR catalyst
converts SO2 to SO3
–SO3 + NH3 form ammonium
bisulfate (ABS)
–Adjust
catalyst formulation to minimize SO2 oxidation
–Restrict low
temp operation of SCR
lCatalyst
Poisons
–Phosphorus
–Na, K
–Catalyst deactivation
– lower catalyst life, increased reagent demand for high NOx reduction