Discussion
Match each desulphurisation route in List I with its characteristic in List II.
List I
A. Wet limestone
B. Spray dryer absorption
C. Dry sorbent injection
D. All three
List II
1. Dry solid product, no liquid effluent
2. Highest removal, saleable gypsum, needs reheat
3. Use an alkaline reagent to capture the acid gas
4. Lowest capital cost, poorest reagent utilisation
Select the correct match.
Answer: C
Correct answer: A-2, B-1, C-4, D-3
Each route has its own signature. Wet limestone gives the highest removal and saleable gypsum but leaves the gas saturated and needing reheat. Spray dryer absorption produces a dry solid and no liquid effluent. Dry sorbent injection is the cheapest to install and the most wasteful of reagent. What all three share is the underlying chemistry: an alkaline reagent neutralising an acid gas.
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