Device for preventing pollution emissions from stirred vessels open at the top

摘要

In the device, the extractor apparatus is designed as a hood having a top rigid plate through which the stirrer shafts are conducted downwards into the vessels and having a flexible curtain which is attached to the periphery of this plate and which concentrically surrounds the vessel. The hood can have a sector-shaped orifice which can be closed by a door which can pivot about the hood axis. Between the edges or rims of the hood curtain and the vessel outer wall, inflatable beads can be arranged which seal the curtain to the vessel outer wall. These inflatable beads can have injector-like injection nozzles which inject air into the cavity between curtain and vessel outer wall. The hood having the sector-shaped orifice can itself be arranged to be rotatable about the hood axis.