| 摘要 |
An evaporator, comprising two heat exchangers. The heating steam has been disposed to flow on one side of the first heat exchange, the liquid to be evaporated flowing on the other side of the first heat exchanger downward from above in heat exchange with the heating steam. The evaporator comprises a second heat exchanger, composed of substantially vertical flow channels (20, 20'). The second heat exhange transports the unevaporated liquid upward from below. The second heat exchanger transports the unevaporated liquid to the upper part of the next distilling stage (10n+1) or to the upper part of the same distilling stage (10n). |
