Economy of Multiple Effect Evaporator:
- Defined as the amount of steam required to evaporate a given amount of water.
- Steam Economy = kg of water evaporated / kg of steam used.
- In a single-effect evaporator, the steam economy is approximately 1.
- In multiple effect evaporators, the steam economy improves significantly, often reaching values of 3-6, meaning one kilogram of steam can evaporate 3-6 kilograms of water.
Factors Affecting Economy:
- Number of Effects: More effects lead to better economy but increase complexity and cost.
- Temperature Difference: Smaller temperature differences between effects reduce heat loss.
- Heat Transfer Area: Larger areas improve heat transfer efficiency.
- Feed Flow Configuration: Forward feed, backward feed, and mixed feed affect the overall efficiency and economy.
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