FLUIDISED BED DRYER WITH INERT NOZZLE Russian patent published in 2009 - IPC F26B17/10 F26B3/12 

FIELD: heating.

SUBSTANCE: invention relates to technique of drying disperse materials in fluidised bed and can be used in aniline and paint, food, pharmaceutical, microbiological, chemical and other industries. Fluidised bed dryer with inert nozzle comprises a casing which consists of a cylindrical and a conical parts and in which a gas distributing grid and solution and heat transfer medium feeding systems are mounted. The installation additionally comprises an impingement plate for the inert nozzle cleaning made as a perforated grid which is set at the point of cylindrical part transition into the conical part. At least two jets into which high-temperature heat transfer medium is supplied are set on the side surface of the conical casing part, they are mounted tangentially to the casing and form a rotating flow of the inert nozzle. The gas distributing grid comprises pneumatic acoustic sprayers inserted into the jets into which high-temperature heat transfer medium is supplied, the casing cover is also fitted with pneumatic acoustic sprayers inserted into the jets for high-temperature heat transfer medium, the jets are placed in a cooling housing, the grid is equipped with a calibrated hole for unloading dried granules. A trapping system is mounted in the lower casing part and comprises an acoustic installation where acoustic agglomeration of fine particles takes place, a cyclone and a hose filter with a bin. The acoustic sprayer is made as a casing with an acoustic vibrations generator inside which comprises a jet and a ring cavity resonator, the casing is made as a vertically set cylindrical bush with an air supply pipe mounted in its upper part and a solution supply pipe mounted perpendicular to its axis. A bush with upper and lower flanges is rigidly fixed inside the casing and coaxially to it, the lower flange is rigidly fixed in the groove made in the casing, the ring cavity resonator made as a cup with conical surface is mounted inside the bush and coaxially to it. The cup is pressed at the resonator rod with d diameter and its tail end is equipped by fixing discs made as elastic petals interacting with the inner bush surface. At least one jet is placed in the lower flange at the angle of 20°÷40° to the resonator axis, the jet axis extension is located at the circle in the middle part of the conical surface. Coaxial conical and cylindrical holes are made on the inner bush surface. The inert nozzle is made as hollow spheres or cylindrical rings or toroidal rings.

EFFECT: increasing drying efficiency.

8 cl, 5 dwg