Filter apparatus for removing contaminants from a fluid stream having improved withdrawal means for spent adsorbent

摘要

An improved withdrawal means for removing spent adsorbent from the adsorber beds of a filter apparatus is disclosed comprising a fixed tube and a rotatable tube positioned concentrically and having a different pattern of slots through each so that a different portion of the slots in each come into an aligned relationship as the rotatable tube is rotated so that spent adsorbent can be pneumatically removed from zones where the slots are aligned. This withdrawal means allows the external selection of adsorbent withdrawal zones, which is especially important in filter apparatus used to filter fluids containing radioactive contaminants.