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Abstract
The design of an SCR system for a coal-fired application is a challenge due to
particulate, catalyst poisons, and So2 in the flue gas. Our experience show that coal-fired
SCRs are successful when the system impact and catalyst deterioration factors are
understood and specific countermeasure are implemented in system and catalyst
design
There are several factors that the system and catalyst must consider in order to assure
success. They include: type of boiler, required performance, fuel and ash analysis, ash
loading, type of SCR, inlet conditions, Catalyst deactivation mechanisms, and impact on
down stream equipment.
This paper explains each system and catalyst deterioration factor that we have
experienced. For each factor, it presents the specific countermeasure that has resulted
in successful SCR systems. Also, it discusses the design of improved catalyst derived
from our experience. Finally, two case studies illustrate the impact of optimized design. |
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