A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides __________________?
Correct answer: D. Higher economy
- A. Lower economy
- B. Lower capacity
- C. Both A. & B.
- D. Higher economy
Explanation
In backward feeding, cold feed enters the last effect and is progressively heated as it moves toward the hotter effects, making better use of the available temperature levels and generally improving steam economy. This arrangement is therefore preferred for cold feed.
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