Discussion
Match each problem in List I with its usual remedy in List II.
List I
A. Stack tip downwash
B. Building downwash
C. Acid condensation in the stack
D. Lost buoyancy after wet scrubbing
List II
1. Good engineering practice stack height
2. Higher exit velocity
3. Flue gas reheat
4. Acid-resistant lining or reheat
Select the correct match.
Answer: D
Correct answer: A-2, B-1, C-4, D-3
Stack tip downwash is cured by a higher exit velocity (2). Building downwash by applying the GEP height rule (1). Acid condensation by an acid-resistant lining or reheat (4). And the lost buoyancy after wet scrubbing by reheat (3), which restores the temperature difference the rise depends on.
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