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Multi-effect mevaporation refers to a system that connects multiple evaporators, make use of the secondary steam from the previous effect evaporator into the next effect evaporator as heating steam, and condensing into distilled water in the next effect evaporator.
| Effective No. | Ⅰ | Ⅱ | Ⅲ | Ⅳ | Ⅴ | Ⅵ | Ⅶ | Ⅷ |
| Water-vapor ratio | ~1.04 | ~1.04 | ~0.36 | ~0.28 | ~0.23 | ~0.19 | ~0.17 | ~0.15 |
| Steam saving | - | 0.5 | 0.18 | 0.08 | 0.05 | 0.035 | 0.025 | 0.018 |
The amount of steam consumed by multi-effect evaporation, t steam /t evaporation water
The more the effects, the lower the steam consumption. But it is important to note that:
With each additional effect, the cost of investment goes up proportionally.
As the number of effects increases, the energy saving effect (absolute value)decreases with each new addition of an effect.
Therefore, with the increase of effect, the longer the investment recovery cycle of each additional effect, therefore, it is necessary to calculate the comprehensive cost of energy consumption and investment of different effect evaporators, and choose the most cost-effective solution.
