RU91891U1 - GRANULATOR - Google Patents

Abstract

1. Granulator, comprising a housing (1), side nozzles (2), hot gas supply pipes (3), exhaust gas outlet (4) and loading (5), a concave gas distribution grill (6) connected to a central discharge pipe (7) ), which is equipped with a pipe (8) for supplying a classifying air flow, characterized in that it further comprises at least one leveling grate (9) located above the hot gas supply pipe, and the part of the discharge pipe protruding above the gas distribution grid is provided with a blind end (10) and side holes (11). ! 2. The granulator according to claim 1, characterized in that it is additionally provided with a scrubber in the upper part for collecting dust particles. ! 3. The granulator according to claim 2, characterized in that the scrubber is equipped with grids for forming a foam layer.

Description

The utility model relates to the technique of granulation of substances in a fluidized bed and can find application in the chemical industry for producing granules of salts in dry form with a given fractional composition.

Known granulator with a fluidized (fluidized) bed, comprising a housing, a pipe for lower supply of hot air, a pipe for exhaust air, gas distribution grill, side nozzles and. an unloading pipe with a nozzle for supplying a classifying air flow, the upper end of the unloading pipe being located at the place of minimal fluctuations in the height of the fluidized bed. Exhausted hot air is discharged through a side pipe in the upper part of the granulator body.

(SU 1780823, IPC B01J 2/16, publ. 12/15/1992)

A disadvantage of the known granulator is its operation in the wave mode, which creates significant difficulties in tuning to optimal operating modes and, as a result, ensuring a high yield of finished products, as well as the difficulty of combining small dust particles in one unit with a scrubber.

Known granulator with a fluidized bed, comprising a housing, a pipe for supplying hot gas (air), a pipe for exhaust gas, a loading pipe, a gas distribution grid connected to the upper end of the central discharge pipe, which is equipped with a pipe for supplying a classification air flow, as well as a mixer and side nozzles.

(SU 1473832, IPC B01J 2/16, publ. 04/23/1989)

A disadvantage of the known granulator is the sufficient design complexity in which the classification air is supplied to the discharge pipe through a mixer located in the upper part of the granulator, as well as the difficulty of regulating the size of the discharged granules, in particular by adjusting the distance between the gas distribution grid and the mixer blades. This leads to the need for side exhaust gas discharge and, as a result, to the loss of production space when installing a scrubber for cleaning exhaust gas from small dust particles.

The objective and technical result of the utility model is to simplify the design of the granulator, reduce operating costs and provide the ability to install additional equipment for purification of exhaust gas without increasing production areas.

The technical result is achieved in that the granulator includes a housing (1), side nozzles (2), nozzles for supplying hot gas (3), exhaust gas (4) and charging (5), a concave gas distribution grid (6) connected to the central an unloading pipe (7), which is equipped with a nozzle (8) for supplying a classifying air flow, while it additionally contains at least one leveling grate (9) located above the hot gas supply pipe, and the part protruding above the gas distribution grill pipe is provided with a hollow end (10) and side holes (11).

In addition, the granulator is additionally equipped with a scrubber in the upper part for trapping dust particles, and the scrubber is equipped with failure gratings for the formation of a foam layer.

The granulator according to the utility model has a simple design, does not require additional costs for the maintenance of regulatory equipment and is vertically compatible with a scrubber in one unit, which saves production space.

The utility model can be illustrated by the pattern shown in figure 1, where:

1 - granulator body;

2 - side nozzle of the granulator;

3 - pipe for supplying hot gas;

4 - pipe exhaust gas;

5 - loading branch pipe;

6 - gas distribution grill;

7 - discharge pipe;

8 - pipe for supplying a classifying air flow;

9 - leveling gratings;

10 - blind end of the discharge pipe;

11 - side openings of the discharge pipe;

12 - scrubber;

13 - scrubber failure grill for the formation of a foam layer;

14 - an additional scrubber failure grid for the formation of a foam layer;

15 - nozzle of the scrubber;

16 - fitting outlet concentrated solution;

17 - a peak;

18 - pipe scrubber;

19 - visor;

20 - grate of final cleaning;

21 - nozzle;

22 - fitting outlet concentrated solution;

23 - droplet eliminator;

24 - pipe exhaust pipe.

The work of the granulator according to a utility model for producing granular calcium chloride from an aqueous solution is as follows.

When the apparatus is started, the nozzles 15 feed a circulating solution of calcium chloride into the scrubber 12 to the grids 13 and 14. Then, the granulator 1 and the scrubber 12 are heated with flue gases with a temperature of 350-500 ° C, which are fed through the hot gas supply pipe 3. The flue gases are evenly distributed over the cross section of the granulator 1 by at least two leveling grids 9 located above the hot gas supply pipe, as well as the gas distribution grid 6, which ensures the formation of a stable fluidized bed. After warming up the apparatus, granular calcium chloride is fed through the feed pipe 5 to the gas distribution grid 6. At the same time as the retur is fed to the gas distribution grid 6, air is supplied to the discharge pipe 7 through the pipe 8 for supplying a classification air flow, which prevents the discharge of the reture from the gas distribution grid surface 6. When this flue gas flow rate is adjusted to a value that ensures that a stable fluidized bed of calcium chloride granules is obtained above the grate 6.

After warming the fluidized bed of granules to a temperature of 170-180 ° C, 40% calcium chloride solution is fed into it through side nozzles 2. The growth of granules occurs due to the evaporation of a solution of calcium chloride on the surface of the granules. The granules of calcium chloride through the side openings 11 fall into the central discharge pipe 7, protruding above the gas distribution grid and provided with a blind end 10. The design of the discharge pipe 7 and the gas distribution grid 6 provides the most efficient operation of the discharge pipe 7. Granules with a size of less than 1 mm (internal retur ) the air flow in the discharge pipe is returned to the fluidized bed for their subsequent enlargement. Standard pellets up to 4 mm in size are discharged from the granulator.

Flue gases containing evaporated moisture and dust, through the pipe 4 of the exhaust gas outlet are sent for cleaning under the first bottom grill 13 of the scrubber 12. A solution of calcium chloride is fed through the nozzle 13 to the specified grill 13. When flue gases interact with the solution, a foam layer is formed on the grate 13 from gas bubbles and a solution that traps the dust contained in the flue gases. As a result of the dissolution of dust of calcium chloride from the granulator and the evaporation of water, the concentration of the foam solution increases. Since the lattice 13 is made a failure, the concentrated solution of calcium chloride is discharged into the space formed by the shell of the scrubber 12 and the top of the granulator 1, and is discharged by the fitting 16 of the outlet of the concentrated solution. To prevent the concentrated solution from falling back into the granulator above the nozzle 4, a visor 17 is installed. After the grate 13, the flue gases are also cleaned in the foam layer on the additional grate 14.

Next, the flue gases through the pipe 18 with a visor 19 enter the final cleaning under the grate 20, on which, with the help of the nozzle 21, a foamy layer of calcium chloride solution is also formed. In this foam layer, a further decrease in the temperature of the flue gases occurs due to their cooling by the incoming solution. The solution of calcium chloride entering through the nozzle 21 has a lower concentration than the solution supplied through the nozzle 15. The concentrated solution is discharged through the nozzle 22. Drops of moisture that are still in the flue gases are trapped in a droplet eliminator 23. The cleaned flue gases through the exhaust the pipe mounted on the pipe 24 is discharged into the atmosphere.

The design of the granulator according to the utility model ensures the achievement of the technical result: simplification of the design of the granulator, lower operating costs and the possibility of installing additional exhaust gas purification equipment without increasing production areas.

Claims (3)

1. Granulator, comprising a housing (1), side nozzles (2), hot gas supply pipes (3), exhaust gas outlet (4) and loading (5), a concave gas distribution grill (6) connected to a central discharge pipe (7) ), which is equipped with a pipe (8) for supplying a classifying air flow, characterized in that it further comprises at least one leveling grate (9) located above the hot gas supply pipe, and the part of the discharge pipe protruding above the gas distribution grid is provided with a blind end (10) and side holes (11). 2. The granulator according to claim 1, characterized in that it is additionally provided with a scrubber in the upper part for collecting dust particles. 3. The granulator according to claim 2, characterized in that the scrubber is equipped with grids for forming a foam layer.