SU1611435A1 - Apparatus for granulating - Google Patents

Abstract

The invention relates to a granulation technique and can be used for granulating fertilizers and for enlarging the diameter of granules. The purpose of the invention is to increase productivity. The apparatus includes a housing 1, a sprayer 9, a device made in the form of a hopper 2 for creating a vertical annular curtain of granules 3. A sprayer 9 is installed inside the apparatus along its axis to create a spray torch perpendicular to or at an angle to this axis. 1 hp f-ly, 1 ill.

Description

The invention relates to a granulation technique and can be used in the production of mineral fertilizers and other granular products. obtaining and enlarging the diameter of the granules, as well as for their coating with a protective sheath or, for obtaining laminated granules.

The aim of the invention is to obtain granules of the same size and an increase in productivity.

The drawing shows the apparatus, the cross village.

The apparatus for obtaining granules and their coating comprises a housing 1, a device made in the form of a hopper 2 for creating a vertical annular curtain of granules 3 located in the upper part of the housing 1 and having an annular slot 4 directed downwards

The hopper 2 consists of hollow conical shells 5 and 6, fastened together by ribs 7 and attached to the body 1 by means of ribs 8. Under slot 4 of the hopper 2 there is a sprayer 9 of granulated liquid (melt, solution and g1I suspensions) with a nozzle 10 dl supplying a granulating fluid to a centrifugal rotating or static sprayer 9 and spraying it on the inside of a vertical flow of granules 3 from inside the cylindrical cavity 11,

Under the spreader 9, a perforated cone 12 is mounted, which is fastened with spacers 13 to the housing 1. In the center of the perforated cone 12 there is a nozzle 14 dp of cooling air inlet or drying agent 11 into the cavity 11 for the purpose of cooling or the retura and granules.

Under the cone 12, a separating grille 15 with a vibrator 16 is mounted to separate the granules of a given size and divert them to the central nozzle 17 ..

To supply cooling and separating air in the apparatus, there is an annular manifold J8 connected by a nozzle 19 with a fan 20. In the housing in front of the grill 15 there is an annular slot 21 for uniform air supply. The central nozzle 17 also has an annular slot 22 with a collector 23 for feeding part of the air into the nozzle 17 from the fan 20 via an additional duct

24 to blow off fines from the separated granules and to cool them. Under nozzle 17 there is a flasher 25 for removal of finished granules. In the lower part of the body I of the apparatus there is an inclined bottom 26 with a pipe 27 for directing small granules of the retur to the silo 28. In the upper part of the elevator 28 there is a branch (29) of the direction of the granules (retur) to the bunker 2 and further to the annular slot 4 of the bunker ,

In the upper part 1 there is

5 collector 30 with an annular gap 31

for uniform removal of exhaust air from the apparatus through the nozzle 32. From above, the apparatus is closed with a crush 33. A drive 34 is mounted on the lid 33

0 dp of rotation of the driver 9 through the drive shaft 35. There is a socket 36 for initial loading of the retour.

The apparatus for the production of granules works as follows.

5 When receiving granules, for example,

urea initial fine seed particles. are loaded through the pipe 36 into the Elevator 28, go up and through the pipe 29 are sent to the bunker

0cir 2. Passage through the slit A, the retur particles enter the body 1 in the form of an annular axisymmetric hitch of the retur and granules 3, forming a cavity 11. Inside the cavity 11 by means of a centrifugal (or static) atomizer 9 on the inner annular surface of the retur stream 3 with an axisymmetric volume - a torch is used to spray the molten carbamide at a temperature close to the crystallization temperature. At the same time, fanning air 20 is supplied with creeping air, which through pipe 19, collector 1B, slots 2 and 22 through pipe 17 enters cavity 11,

5 intensively cooled and crystallized sprayed melt on the surface of a moving retur stream. Pad on the perforated cone 12, blown from below with cooling air, often

Q retur particles are additionally cooled with and supplied to vibrate along the separating grid 15. Melkrk cooled granules (retur) are spilled through the openings of the lattice 15 on the bottom 26 and are directed along nozzle 27. the elevator 28 is lifted up and through the pipe 29 is again sent to the bunker /. to create a vertical annular curtain of granules 3. Large granu 5

0

Under the influence of gravity and vibration, the holes that have not passed through the openings of the lattice 15 are directed to the nozzle 17. In the nozzle 17, the final separation of large granules from dust particles and small granules by air flow directed through the annular gap 22,

Cooled coarse granules of a given size are automatically discharged through the shutter-flasher 25.

The use of this design of the granulating apparatus will significantly improve productivity by increasing the spray surface and the spray cone.

Claims (2)

1. A granulating apparatus comprising a vertical body, a distributor of powdered material for creating an annular flow, an atomizer of liquid components mounted along the axis of the body, and a cooling air supply device characterized in that. In order to obtain granules of the same size and increase productivity, the body in the lower part is made with an annular slot, and the device is equipped with an air supply manifold mounted concentrically outside the body opposite the slit and connected to an air supply unit made in the form of perforated a cone located under the nozzle, the larger base of which is facing the slit, and a separation grid with a vibrator in the form of an inverse a cone, the larger base of which faces the slit, wherein the nozzle is made in the form of a hollow body of rotation with perforated walls and is installed with the possibility of rotation, and the grating is provided with a nozzle made with a slit and equipped with a manifold for air supply. 2. An apparatus according to claim 1, wherein it is equipped with an elevator for returning the retur to the distributor of the powdered material.