SU1586765A1 - Installation for granulating fine-dispersed materials - Google Patents

Abstract

The present invention relates to the production of granular products from finely powdered materials and reduces the dustiness. The installation contains a granulation chamber / KG / 1, two cyclones / C / 11,12 and a filter 13 installed in the nozzle 5 for draining the coolant. CG 1 contains vertical partitions dividing it into three sections / C / 8.9 and 10. C 11 and 12 are placed in the second C 9. Inlet pipes 14 and 15 C 11 and 12 are connected to the first and third C 8 and 10. Each nozzle 3 is provided with a pipe 16 for introducing compressed air and is located inside C in its lower conical part above the discharge port. 1 il.

Description

The invention relates to the production of granular products from finely divided powder materials' and can be used in the chemical, microbiological, food and other industries.

Nel invention - reduction pypeunosa,

The drawing shows the installation diagram).

The installation for granulation of finely dispersed materials includes a fluidized-bed granulation chamber 1 containing a gas distribution grid 15, nozzles 3, nozzles 4 and 5 {coolant inlet and outlet, nozzle 6 for powder supply and vertical partitions 7 dividing the chamber into three sections 8-10. The installation 20 also contains two cyclones 11 and 12 and a filter 13 installed in the pipe | 5 for the removal of coolant. Cyclones [11 and 12 are located in the second section 9 of the granulation chamber. 25

The inlet nozzles 14 and 15 of the cyclones ill and 12 are connected to the first and third sections. Each nozzle 3 is equipped with a pipe 16 for introducing compressed air and is placed inside the cyclone in 3Q of its lower 'conical part above the discharge opening.

Installation works as follows.

The powder is fed through the nozzle 6 into the first section of the chamber, in which the binder is sprayed with the nozzle 3. The obtained granules flow through the flow slots in the prelattice zone of the partitions 7 into the second and then into the third section, from which through the pipe 17 are removed from the installation in the form of a solid fraction. Changing the slit gap in the prelattice zone formed by partitions 45, 7, leads to the formation of granules of a certain particle size distribution, since the size and number of granules flowing from one section to another depend on what height the partition will be raised above the level of the lattice. By changing the dimensions of the slit, it is also possible to adjust the residence time of the granules in each section. In the case when the velocity and flow rate of the fluidizing agent is only enough to maintain the granules in suspension, in the cross-sectional zones their overflow will occur from one section to another, the hydrodynamic regime in which may vary, since the sublattice area is also divided into sections, and each section has an individual inlet coolant. The exhaust air together with the dust from the first section enters the cyclone 11, where dust is deposited. From the cyclone 11, the deposited dust is carried out by a stream of air entering through the nozzle 6 into the second section for further granulation. “At the same time, the binder liquid is distributed by the nozzle 3 integrated into the cyclone 12. The granulation process continues in the second section of the chamber, in which the filter 13 and nozzle 18. Non-granulated dust enters the irrigation zone of the nozzle 18 and returns to the layer in the form of granules, and the dust deposited on the surface of the filter 13 is brushed off directly to the irrigation zone of the nozzle Unki 18 and subjected to granulation. Granules from the second section flow through the slit gap in the prelattice zone of the partition 7 into the third section, where they dry and discharge, and the dust particles together with the air enter cyclone 12, from where they return to the second section in the form of air entering through the pipe 16 granules.

A multi-sectional chamber makes it possible to use almost all powder for granulation, since dust is supplied directly to the nozzle irrigation zone and the amount of ungranulated dust is significantly reduced. Dividing the chamber into sections by transfer slots above the grate with the possibility of supplying a coolant of different temperature and speed to them makes it possible to level the residence time of the powder in granulation zones. With multi-section granulation, the output of granules of a certain particle size distribution. composition sharply increases, while dusting and the yield of non-commodity fraction are significantly reduced.

Equipping the unit with a filter allows fine air purification, eliminating the emission of powder into the atmosphere and reducing pypeunos, and shaking off the dust deposited on the surface of the filter into the layer in the irrigation zone of the nozzle for granule formation. clogging of the discharge nozzle of the cyclones, and also creates an obstacle to the flow of ascending air into the cyclone.

The nozzles built into the cyclones make it possible to spray the binder directly into the stream of dust-saturated air, which increases dust collection and dust utilization during granulation,

Claims (1)

Claim Installation for granulating finely dispersed materials, including a fluidized-bed granulation chamber containing a gas distribution grid, nozzles, coolant inlet and outlet pipes, a powder supply nozzle and vertical partitions dividing the chamber into three sections, and a cyclone connected to the granulation chamber characterized in that, in order to reduce dust extraction, it contains two cyclones and a filter installed in the nozzle for the removal of coolant, cyclones are placed in the second section, the inlet nozzles cycle newly connected to the first and third sections, each pipe provided with a nozzle for input of compressed air and placed inside of the cyclone in its lower part above. discharge hole.