Fluidised bed appts. for mixing, drying and coating bulk solids - has support tube concentrically placed around down pipe to form ring shaped aperture in mixing chamber

摘要

In globe-shaped fluidised bed plant, bulk goods are mixed. The novelty is that a support tube is concentrically placed around the down pipe to create a ring-shaped aperture in the mixing chamber. Specifically, the mixer comprises a globular housing (1) in which the solids are mixed about the same rotary axis (2), consisting of upper (14) and lower (3) sections made of steel or glass meeting at flanges (15,16). The upper part (14) bears an collector egress unit (17) while the lower (3) section incorporates a reverser basin (4). The down tube (6) passes through the mixing chamber (13, 19) at which point the support tube (11) is affixed by ribs (24). USE/ADVANTAGE - The arrangement reduces fractured mixing of the bulk solids and prevents the formation of hard deposits within the mixer bed. The arrangement is suited for coating catalyst substrates such as are applied in the manufacture of phthalic acid anhydride. The catalyst substrates are formed as balls, cylinders, rings or rods of 5-15 mm radius.