Abstract: The wet cleaning of filter cartridges (4) in fluidised-bed apparatuses and similar process units, without their being dismantled, is carried out by means of cleaning fluid sprayed out of nozzle orifices (10) arranged in the form of a ring, the nozzle orifices (10) being installed in the filtered exhaust-gas space (7) and the filter cartridge (4) being moved through this ring of nozzle orifices (10) by a lifting device (17). In a preceding flushing cycle, the filter cartridge (4) is filled with cleaning fluid and is then subjected to an ultrasonic transmitter (26) and with pressure pulses. The nozzle orifices (10) are designed and arranged in such a way that the issuing cleaning jets strike the filter casing (5) tangentially at an angle of inclination .alpha. and thus set the filter cartridge (4) in rotation. The best possible cleaning effect is achieved by the rotation and lift of the filter cartridge (4).

Abstract: The interior of a rotary-disk apparatus is divided by a generally cylindrical wall into an inner processing zone and an outer processing zone. The inner processing zone can be connected to an disconnected from the outer processing zone by moving the wall into and out of sealing engagement with an underlying rotary disk. When the wall and the disk are not in sealing engagement with each other, a gap is formed which permits the transfer of granules from the inner processing zone to the outer processing zone as a result of the rotation of the disk.

Abstract: A steam granulation technique involves the injection of a jet of steam into a bed of fludized particles to be granulated. The jet of steam is substantially enveloped by a jet of air to inhibit the premature condensation of the steam onto the fluidized particles and/or the condensation of the steam onto neighboring walls of an apparatus employed to fluidize the particles, thereby inhibiting excessive wetting and lumping of the particles during their granulation.