Discussion
Selective catalytic reduction at \( 85 \) per cent removal treats \( 21 \) t/day of nitrogen oxides. The residual emission is
Answer: A
The removal is \( 21 \times 0.85 = 17.85 \) tonnes, leaving \( 3.15 \) tonnes a day. Pushing the removal to ninety per cent would require more catalyst volume and would raise the ammonia slip unless the injection control were improved with it.
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