Contact plate for mass exchange appts - has two rotatable facing discs with uniformly wide archimedean spiral slots

摘要

A contact plate for mass exchange appts such as absorbers, desorbers, bubblers, dryers consists of two discs which face each other and can be rotated around a central axis relative to each other. Each disc has a slot of uniform width in the shap of an Archimedean spiral with the centre in the middle of the disc. The free passage through the contact plate can be varied by changing the relative posn. of the discs. These contact plates are easy to mfr. They provide an accurate control of the free passage area. The open areas are uniformly distributed over the whole area at all posns.