| 摘要 |
In a plate column including a plurality of spaced horizontal plates provided with downcomers, a plurality of openings in the plates for passage of the vapors upwardly, and short nipples disposed in the openings, the improvement residing in the provision over the nipples of rotatable, vertically movable disks having circumferentially arranged fan elements. The diameter of the disks is such that when insufficient quantity of vapor is generated, the disks descend onto the short nipples to block flow of any vapor therethrough. A fan wheel may be provided below each disk in the vapor space of the lower plate to restrict escape of entrained liquid particles.
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