PLANT FOR CATALYST DRYING AND TEMPERING Russian patent published in 2008 - IPC F26B17/10 F26B3/12 

FIELD: heating, drying.

SUBSTANCE: invention relates to solutions drying technologies which provide for production of granular product with hydroscopic properties, and may be used in different areas of chemical technologies or similar engineering branches where high requirements to the magnitude of final product humidity are applied. Invention deals with the plant for catalyst drying and tempering containing piston pump for source material supply, filter for admixtures separation, and distributing dryer intended for catalyst drying and granulating from solution, multicyclone collector for finished product entrapping and delivering to screw or belt conveyor. The specific feature of the plant is the recycle flowing to Venturi scrubber by means of smoke exhauster. Recycle is collected from silo part of scrubber to tank as sludge and from dip pan. Solution is supplied to scrubber by pump. Drying agent is also supplied by fan to tempering machine through heat generator. Separator supplies dried-out product to pneumo transport cyclone. Tempering machine is designed for creating two-stage temperature tempering modes and ensuring preset time of catalyst residence in each stage: stage 1 ensures supply of drying agent to upper part of machine, while gas-steam mixture contacting with catalyst particles is supplied to the lower part of machine. Finished product is supplied to product cooler. Scrubber with dip pan is intended for final dust entrapping and drying agent cleaning before it is released into atmosphere. Plant is provided with used drying agent cleaning system, finished product cooling unit, and metered feed unit, product transport unit inside the plant, finished product tank and other units needed for building up the required infrastructure of the complete plant. Source solution supply system is implemented as acoustic injectors represented in the shape of housing with US vibration generator being in the form of nozzle and annular volume vibrator. Vibrator housing is represented in the form of vertical cylindrical bushing with pipe for drying agent supply located in its upper part. Pipe for damp source solution 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 and tempering efficiency.

2 cl, 2 dwg