After ammonia is mixed with dilution air, ammonia injection grid would spray the mixture into boiler flue pass. Ammonia injection grid (AIG) is the key equipment in SCR system. Distribution of ammonia in flue pass is directly related with NOx reduction efficiency and ammonia escape. Even distribution of ammonia in flue pass is prerequisite for selective catalytic reduction.
Ammonia injection grid is mounted in vertical flue pass between economizer and SCR reactor.
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