SPRAY-TYPE DRYER OF COUNTER-CURRENT SWIRL FLOW WITH INERT CARRIER Russian patent published in 2009 - IPC F26B17/10 

FIELD: heating; drying.

SUBSTANCE: invention relates to disperse materials drying and may be used in microbiological, food, chemical and other industries. The spray-type dryer with counter-current swirl flows having inert carrier consists of a cylindrical body with, at least, two tangential nozzles for coolant supply. The pneumatic injectors for solution supply to the inert carrier bed are located in the above nozzles. The central gas line is intended for the spent coolant removal above the gas line cut between the body surfaces and perforated lattice being perpendicular to the body axis. The dried solution is sprayed by the injectors onto the particles of the inert carrier and dried there until it is separated from the particles surface and carried out by the spent coolant flow through the gas line. Besides, one part of the dried solution particles is supplied to the tank, whereas the other part of particles is transferred from gas line to acoustic plant through the pipeline. The optimal parameters of the plant are suitable for acoustic processing of medium-disperse dust and are as follows: acoustic pressure level is 140 dB and more, oscillatory motion frequency is 900 Hz, dust concentration in the flow is less than 2 g/m³, time of insonification is 1.5...2 s. After that, the flow is directed to the cyclone, sleeve filter with tank. Then the finished product is supplied to the conveyor. The damp source solution supply system is implemented as a number of acoustic injectors consisting of a body with ultrasonic vibrator in the form of nozzle being installed inside and annular resonant cavity. In addition the body is represented with cylindrical bushing. There is a pipe for air supply in the upper part of the bushing and a pipe for solution supply, which is perpendicular to the pervious pipe axis. In addition, the bushing with top and bottom flanges is rigidly fixed inside the body and in axial alignment to it. The bottom flange is rigidly fixed in the groove made in the body. The annular resonant cavity is located inside the bushing and in axial alignment to it. It is represented with a cup with tapered surface. The cup is molded on the rod with resonant cavity d diameter. The fixing discs are available in the tail part of the resonant cavity. The discs are implemented in the shape of leaves interacting with the internal surface of the bushing. At least, one nozzle is available on the bottom flange at 20°÷40° angle to resonant cavity axis. In addition, the nozzle axis continuation coincides with the circle being in the middle part of tapered surface. Coaxial conic and cylindrical holes are made on the internal surface of the bushing.

EFFECT: increased drying efficiency.

2 cl, 3 dwg