| 摘要 |
The invention relates to a falling film evaporator, comprising an outer shell formed by a cylindrical shell (1) and convex ends (2,3), at least one tube bundle (4,5) formed of vertical tubes (6) arranged inside the outer shell, whereby a heat-releasing, condensable vapour can be fed into the vertical tubes (6) from below upwards, and a heat-receiving, vaporizable liquid can be fed to the upper end of said tube bundle (4,5) to flow downwards along the outer surface of the vertical tubes (6) as a thin liquid layer, whereby means for discharging non-condensable gases contained in the heat-releasing vapour has been arranged in the tube bundle (4, 5). The invention is characterized in that the vertical tubes (6) of the tube bundle (4, 5) are at their lower end attached to a tube plate (7, 8) and at their upper end to collecting pipes (9).
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