BOILING BED DRYER WITH PASSIVE NOZZLE Russian patent published in 2008 - IPC F26B17/10 F26B3/12 

FIELD: heating, drying.

SUBSTANCE: invention relates to disperse materials drying in boiling bed and may be used in aniline-ink industry, food, pharmaceutical, microbiological, chemical and other industries. Boiling bed dryer with passive nozzle includes housing consisting of cylindrical and tapered parts. Housing accommodates gas-distributing lattice and coolant and solution supply systems. In addition, fender for cleaning passive nozzle realized in the shape of perforated lattice is also available in the housing. Perforated lattice is fixed in the point of cylindrical part transfer to tapered form. At least, two nozzles are located on side surface of tapered housing part. High temperature coolant is supplied to both nozzles as they are installed tangentially to housing and create swirling flow of passive nozzle. Gas-distributing lattice contains pneumatic acoustic injectors inserted into nozzles which are supplied with high-temperature coolant. Housing lid is also equipped with pneumatic injectors inserted into nozzles for high-temperature coolant. Nozzles are provided with cooling enclosures. Dried-out granules are discharged through calibrated opening provided in lattice. Recovery system including acoustic plant, where acoustic agglomeration of fine particles takes place, cyclone and sleeve filter with silo is installed in the lower part of housing. Acoustic injector is represented in the shape of housing with sound vibration generator operating within US frequency range and being in the form of nozzle and annular volume vibrator. Vibrator housing is represented in the form of vertical cylindrical bushing with pipe for air supply located in its upper part. Pipe for liquid supply is perpendicular to the above pipe axis. Inside the housing and in axial alignment to housing, bushing with top and bottom flanges is rigidly fixed. Bottom flange is rigidly fixed in groove made in housing, and annular volume vibrator is displaced in axial alignment inside bushing. Volume vibrator is in the shape of cup with tapered surface, which is molded on rod of vibrator d diameter. Retaining disks in the form of elastic blades interacting with internal surface of bushing are implemented in vibrator tail-end part. At least, one nozzle is located in bottom flange at 20°÷40° angle to vibrator axis. Nozzle axis is continued on circle being in the middle part of tapered surface. Cone-shaped and cylindrical openings are made on the inner surface of bushing in axial alignment.

EFFECT: improvement of drying efficiency.

2 cl, 2 dwg