Granulation process in fluid bed and related granulator

FIELD: chemistry.

SUBSTANCE: invention refers to granulation process in fluid bed of various substances, e.g., carbamide, ammonium nitrate, ammonium chloride and other similar granulated substances. Substance granulation process in fluid bed (F1) involves cooling finishing granules in the second fluid bed (F2). Herewith the same cooling air flow is used consistently for continuous generation and maintenance of cooling (F2) and granulating (F1) fluid beds arranged in tandem relative to the specified running cooling air flow. Granulator for fluid bed granulation includes container-shaped self-supporting structure limiting internal cavity wherein granulation process takes place and there is a partition mounted as a support for granulating fluid bed (F1). Granulator is provided with a plate arranged in the internal cavity of self-supporting structure, spaced under the partition and forming the base being a support for cooling fluid bed (F2), consisting of hot granules produced in granulating fluid bed (F1). The beds are connected through perforated, latticed, mesh or otherwise gas-permeable partition. The internal cavity is equipped with vertical downpipe to pour finished granules from granulating fluid bed (F1) to cooling fluid bed (F2). Under base-forming plate sheet, there are fluidising air feeder and deliverer to the internal cavity of self-supporting structure and cooling and granulating fluid beds forming and maintenance units.

EFFECT: reduced air consumption required to complete granulation process.

7 cl, 2 dwg

 

The technical field to which the invention relates.

The present invention relates to a method of granulation in the fluidized bed of various substances, such as urea, ammonium nitrate, ammonium chloride and other similar granulated substances. The invention relates in particular to a method of granulation in the fluidized bed with cooling the obtained granules in the second fluidized bed and their direction after cooling to storage and/or packaging. The invention relates also to the granulator for implementing the above method.

The level of technology

When the granulation in the fluidized bed the formation of granules of a certain substance occurs by continuous growth (in volume and weight) of the seed grains or particles of this substance, which served continuously in a fluidized bed simultaneously with the flow of the corresponding is in a liquid state of matter for growing pellets. Substance for growing granules, which has the same nature as the granulated substance, and is in a liquid state, wets the seed grain and the growing granules, which together form a fluidized bed, stick to them and hardens on them.

Is in a liquid state substance for growing granules, which are served in the fluidized bed when ODA is divided by the temperature, which, for example, by granulation of urea is in the range from 120 to 140°, solidifies on the seed crystals while maintaining its adhesive sticks to the gradually growing in the fluidized bed granules.

The temperature of the outer surface formed in the fluidized bed of granules at the outlet of the fluidized bed is essentially not different from the temperature of the injected fluid layer in the liquid state of matter for growing granules.

When the granulation, in particular, urea, the temperature of the outer surface formed in the fluidized bed of granules on the exit ranges from 110 to 120°C.

The obtained granules for further use, for example, as fertilizer must be cooled to a temperature at which they can be kept in the relevant warehouse. Granules of urea, in particular, is usually stored at a temperature of about 50°C.

To meet this requirement has been proposed another method of granulation in the fluidized bed with the cooling of the finished granules.

This method of granulation in the fluidized bed is described in particular in patent US 4219589 you received in the first fluidized bed hot pellets are cooled in the second fluidized bed.

However, for all its obvious advantages of this methods for the granulation in the fluidized bed has one very serious drawback.

In addition to the high air flow rate required for the formation and maintenance of the first fluidized bed, which is the process of pellet formation, this method requires a continuous flow of large amounts of air for the formation and maintenance of a second, cooling the finished granules, fluidized bed, and a corresponding increase in energy consumption, additional consumption, which, obviously, adversely affects the efficiency of the entire process of granulation.

Summary of the invention

The present invention was based on the objective to develop a method of granulation in the fluidized bed specified in the beginning of the description of the type of functional features which would allow to eliminate the above described disadvantages of the known methods and, in particular, to significantly reduce the total air flow required for completion of the granulation process.

This problem is solved by using the proposed invention, a method of granulating the substance in the fluidized bed with the cooling of the finished granules in the second fluidized bed, characterized in that the same flow siraudeau air is used for the continuous development and maintenance of cooling and accordingly granulating fluid with the OEB, which are essentially sequentially relative to the specified stream of flowing air.

Other features and advantages of the invention discussed below in more detail on the example of one of the options proposed in the invention method of granulation in the fluidized bed with reference to the accompanying description of the drawings only illustrate the invention but do not limit its scope.

Brief description of drawings

Attached to the description of the drawings in particular, it is shown:

figure 1 - schematic view of a perspective view of the granulator for granulating various substances in the fluidized bed proposed in the invention method and

figure 2 is a schematic cross-section of the granulator shown in figure 1.

The preferred embodiment of the invention

Attached to the description of the drawings shows the overall position 1 granulator designed for granulating the relevant substances in the fluidized bed proposed in the invention method.

Shown in the drawings granulator has a rigid self-supporting structure 2, which is made in the form of a container having the shape of a parallelepiped, and which limits the cavity And in which two are described in more detail below, fluid layers F1 and F2 is the process of granules is proposed by the invention method.

The supporting structure 2 pellet (hereinafter referred to simply by the container 2 has two long side walls 5, 6 and short front (or top) 7 and 8 rear wall and a closed top is not shown in the drawings, the lid and base are made of two hollow sheets - the top sheet 4 and lower sheet 4A.

One of the distinguishing features of the proposed invention granulator is the located between the lower edge 7a of the upper (anterior) wall 7 of container 2 and a top plate 4 consisting of two sheets of the base of the pass (or window) 20, through which the internal cavity And the container 2 is communicated with the surrounding space. In accordance with another feature of the invention, the sheets 4 and 4A of the base of the container 2 adjacent to its rear wall 8 and are held under its front wall 7, speaking outside the given value. To the front free edges of the sheets 4, 4A of the base is welded to the front, situated essentially parallel to the front (upper) wall 7 of the container, the panel 17, which forms in the bottom part of the container, a kind of pocket 18, which is shown in the drawings, the embodiment passes through the entire width of the front wall 7 of the container and through the window 20 is communicated with the inner cavity A.

Pages 4, 4A of the base of the container 2, the rear wall 8 and perestavali 17 formed in the base of the container chamber 19, which directly communicates with the internal cavity And through the upper sheet 4 grounds that to do this, perforated, mesh, lattice, or otherwise permeable to gas. Located at the base of the container under internal cavity And the chamber 19 has a limited height and is designed, as discussed more fully described below, to distribute fed into the cavity And flow siraudeau air.

Another feature of the invention is the conical shape of the distribution chamber 19, which gradually tapers from the rear wall 8 of container 2 to the front panel 17. This geometry of the distribution chamber is provided by a certain inclination of the bottom sheet 4A of the base to the top of the sheet 4 with a gradual decrease in the distance between the sheets of Foundation in the direction of the front panel 17.

Inside the container 2 at a certain distance from the back wall 8 is parallel vertical rectangular panel 15, which forms the inside of the container at its rear wall of the chamber 16.

Vertical panel 15 is attached to the opposite long walls 5 and 6 of the container 2, and its lower horizontal edge 15A located at some distance from the top of the sheet 4 to the base of the container, forms a passage (or a window 25 through which the location is defined in the rear part of the container chamber 16 communicates with the internal cavity A. The chamber 16 communicates with the internal cavity And the container through the opening 11 in the top part of the panel 15.

Inside the container 2 at a certain distance from the top of the base sheet 4 is rectangular wall 14, which is on the perimeter fits tightly to the long lateral walls 5, 6, the front wall 7 of the container and to the panel 15. The partition wall 14, which forms an internal cavity And container area In granulation and serves as a support for fluidized bed of F1, in which the process of granulation loaded into the granulator substance made of a perforated, mesh, lattice, or otherwise permeable to siraudeau air, necessary for forming and maintaining a fluid layer F1.

1 schematically shows a located in the upper part of the container 2 (known as such) dispenser 10 seed grains or particles of the granulated substances and also well-known and therefore does not require a detailed description) valves 12 and 13 are in the liquid state of matter for growing granules.

Figure 2 schematically shows located on the rear wall 8 of the container, the pipe 22, through which the chamber 19 serves the air. The pipe 22 is connected to a known and therefore not shown in the drawing devices with external line, and the which in chamber 19 under pressure serves required for granulation in the fluidized bed the air.

Below with reference to figures 1 and 2 are considered one of the options proposed in the invention method of granulation.

In continuous feed in pellet seed grains or particles of the granulated substances and substances necessary for the cultivation of granules, in the area above the partition 14 is formed fluidized bed granulating F1. The formation and maintenance of this fluidized bed granulating occurs when continuous feeding into the chamber 19 siraudeau air which passes from it through the perforated sheet 4 of the base underneath the partition wall 14 of the lower part of the inner cavity And the container. In the granulation process (growth of granules) the height of the fluidized layer F1 is incremented, and its free surface rises to (pre-calculated) level bottom of the hole 11. At that moment, when the free surface of the fluidized bed F1 reaches the bottom of the hole 11 formed in the fluidized bed very hot finished granules (the temperature of which depends on the temperature of the substance, from which grow pellets) of a given size begin a continuous stream, as in a dam, "flowing" from the fluidised bed down through the lower edge of the hole 11.

From this point, the height of the fluidized bed granulating 1 remains essentially constant.

The finished granules continuous flow pass through an intermediary (the guide) camera 16 and "fall" (cascade) consisting of the finished granules fluidized bed F2, which is formed on the upper perforated sheet 4 the base of the container and in which they are cooled by the same thread siraudeau air, which is formed and maintained a fluidized bed of F1. Formed in the flow siraudeau air the second fluidized bed F2 consists only of the finished granules that fill the inner cavity And the container is above the upper perforated sheet 4, the intermediate chamber 16 and is connected with her pocket 18.

The pressure on the free surface of the fluidized bed of the F2 layer in the intermediate chamber 16 and in the pocket 18 is less than the pressure on the free surface of the fluidized layer F2 in the inner cavity And the container between the walls 7 and 15, and therefore, taking into account the fact that all these areas are functionally similar to communicating vessels, the height of the fluidized bed of the F2 layer in the intermediate chamber 1 to 6 and in the pocket 18 is greater than the height of the fluidized bed F2 on the upper perforated sheet 4 the base of the container between the walls 7 and 15.

It must be emphasized that the cooling fluid layer F2 is connected with the upper fluidized bed granulating F1 only through the partition 14, which is with his support.

It should also be noted that the intermediate chamber 16 acts as a channel or a so-called riser or peritonei pipe through which hot granules from the fluidized bed F1 fall into a fluidized bed of F2.

In the fluidized bed F2 in the process of heat exchange with part of the stream siraudeau air finished granules gradually cooled. Therefore located between the sheet 4 to the base of the container and the partition wall 14 a portion of the internal cavity And the container can be called a cooling zone of granules.

At the corresponding height (cooling) fluid F2 layer free surface in the pocket 18 reaches the upper edge of the front panel 17 through which the container 2 is unloaded ready and cooled granules.

Since the properties of the fluidized bed is similar, as is well known, fluid properties, the level of pellets in the pocket 18 in the intermediate chamber 16 and into the inner cavity And the container during operation is stabilized on the corresponding piezometric height.

It must be emphasized that from the height of the front panel 17 depends not only the height of the fluidized layer F2, and the average residence time of the finished pellets in the cooling zone, and thus the temperature of the finished granules discharged from the proposed invention the container (pellet) 2.

Since the "unloading" goth is the new pellets the process of obtaining granules proposed in the invention method proposed in the invention granulator continues in steady mode.

The main distinguishing feature of the proposed invention, a method of granulating is the formation and maintenance of a fluidized layers F1 and F2 respectively for granulating and cooling of the finished granules in the same thread siraudeau air, which passes through both fluidized bed of F1 and F2, essentially consistently located relative to it.

The second distinctive feature proposed in the invention method is essentially a cascade overflow ready hot granules from the fluidized bed granulating in cooling fluidized bed.

The main advantage of the present invention is significant in comparison with the known methods of granulation in the fluidized bed reduction of siraudeau air, necessary for the formation and maintenance of a fluidized bed. At high flow siraudeau air required for granulation in the fluidized bed, a noticeable reduction in air flow, respectively, and provides a significant reduction of the energy consumption.

In the most preferred embodiment of the invention the upper part of the front panel 17 is made in the form of a movable valve 21, the position of which the height can be regulated accordingly (moving it to the VERTIC is flax direction). Adjustment of the damper height allows you to dynamically adjust the height of the cooling fluid in the F2 layer, and at any temperature siraudeau air supplied into the internal cavity And granulator, served in a fluidized bed of F1 air optimum temperature (for example, different but constant winter and summer), as well as to withdraw due to this, from the use of inefficient heat exchangers.

The present invention does not exclude the possibility of introducing in the above variant of the various changes and improvements, while staying within the scope of invention defined by its formula.

For example, the width of the pocket 18 and the intermediate chamber 16 may be less than the width accordingly, a short front wall 7 of the container and the inner panel 15.

1. Method of granulating a certain substance in the fluidized bed (F1) with cooling of the finished granules in the second fluidized bed (F2), characterized in that the same flow of cooling air is consistently used for the continuous formation and maintenance of cooling (F2), respectively, and granulating (F1) fluidized beds, which are essentially sequentially relative to the specified stream of flowing air.

2. The method according to claim 1, characterized in that the ready Gras is uly granulated substance poured, essentially, a cascade of fluidized bed granulating in cooling fluidized bed.

3. Granulator for granulating in the fluidized bed method according to claim 1, containing a self-supporting structure (2)having essentially the shape of the container and bounding an internal cavity (A), which is the process of granulation and which is a partition (14)serving as a support for fluidized bed granulating (F1), characterized in that it is located in the inner cavity (A) self-supporting structure under the partition (14) is indented from it forming a base sheet (4), which serves as a support for consisting of the data obtained in the fluidized bed granulating (F1) hot granules cooling fluidized bed (F2), connected with a fluidized bed granulating (F1) through the partition (14)made of perforated, grid, mesh or otherwise permeable to gas, located vertically in the inner cavity (A) peredachny riser (16), on which the finished granules from the fluidized bed granulating (F1) poured into emerging on forming the base sheet (4) cooling fluidized bed (F2), and below wave base sheet (4) of the device (22, 19) for the supply and distribution siraudeau air in the inner cavity (a) semones the overall design and development and maintenance of the cooling fluidized bed (F2) and fluidized bed granulating (F1), which are arranged in series relative to the specified stream of flowing air.

4. The granulator according to claim 3, characterized in that peredachny riser (16) is formed by a camera (16)bounded by a wall (8) self-supporting structure (2) and located within the inner cavity (A) offset from the specified vertical wall panel (15), the lower horizontal edge (15A) which does not reach forming the base sheet (4) and forms a passage (25)connecting the specified camera (16) above to form a base sheet (4) with an internal cavity (A) self-supporting structure.

5. The granulator according to claim 4, characterized in that peredachny riser (16) has a hole (11)through which it communicates with the upper part of the inner cavity (A) self-supporting structure.

6. The granulator according to claim 3, characterized in that the cooling fluid bed (F2) is communicated with the outside space through the pocket (18)located between the wall (7) self-supporting structure (2) and front panel (17), which is preferably parallel to the top wall (7) self-supporting structure is attached to forming the base sheet (4), the clerk of support for the cooling fluidized bed (F2).

7. The granulator according to claim 6, characterized in that on the upper edge of the front panel (17) is installed movable flap (21), height-adjustable by means of its displaced the I in the vertical direction.



 

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FIELD: chemical industry; chemical-pharmaceutical industry; devices of coating of loose materials.

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EFFECT: the invention ensures production of the uniform coating on each particle and the continuous withdrawal of the ready particles from the zone of heating at an equal residence time in it of each particle.

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3 cl, 2 dwg, 3 tbl, 2 ex

FIELD: chemical industry; food industry; pharmaceutical industry; other industries; methods of deposition of coatings on the particles of the bulk materials.

SUBSTANCE: the invention is pertaining to the method of deposition of coatings on the particles of the bulk materials and may be used in chemical, food, pharmaceutical and other industries. The technical result of the invention is the increased efficiency and the improved quality of the product. The method of deposition of coatings on the particles of the bulk materials provides for the coating melt atomization of a melt of cover by the gas heated above the fusion point of the coating material into the liquated layer of the particles of the bulk material. The bulk material preliminary is heated up to the temperature of 0.5-0.6 of the fusion points of the coating material by the flow of the fluidizing agent. At dosage of the melt the temperature in the liquefied layer of the bulk material makes no more than 0.6-0.8 of the temperature of the coating materials fusion points. After termination of the batching of the melt conduct the gradual reduction of the temperature of the layer of the material up to the temperature of the environment.

EFFECT: the invention ensures the increased efficiency and the improved quality of the products.

3 cl, 1 ex

FIELD: inorganic compounds technologies.

SUBSTANCE: granulated calcium chloride is prepared in fluidized-bed vessel, wherein fluidized bed is created by flue gas flow at bed temperature 150-200°C, gas flow velocity in the bed 2.5-3.0 m/s, and hydraulic resistance in bed 500-700 kg/m2. Granules are sprayed with 46-50% calcium chloride solution, which was preliminarily concentrated by leaving gas heat and further concentrated by dissolving dust fractions.

EFFECT: achieved uniform granulometric composition, increased strength of granules, and reduced moisture content therein.

1 dwg, 1 tbl

FIELD: granulating engineering.

SUBSTANCE: device comprises vertical cylindrical housing, gas-distributing grate, vertical gas-supplying branch pipe coaxially secured inside it, tangential gas-supplying branch pipe mounted in the top section of the housing, branch pipe for supplying of dispersed material, and branch pipe for discharging granules. The vertical gas-supplying branch pipe receives the nozzle for spraying pulp or melt. The top section of the housing receives the axial gas-discharging branch pipe provided with a conical funnel and deflector. The tangential gas-supplying branch pipe is connected with the branch pipe for supplying dispersed material. The plane of the exit section of the branch pipe for supplying dispersed material is perpendicular to the axis of the tangential gas-supplying branch pipe. The deflector is made of a rotation body defined by two coaxial conical surfaces, inner surface and outer surface. The device is provided with valve gates to control the process. The valve gates are mounted in the gas-supplying pipe lines.

EFFECT: enhanced efficiency.

1 dwg

FIELD: chemistry.

SUBSTANCE: application contains the description of method of granulating in fluidised bed and obtaining the final granules of certain substance in the so called vertically growing granulating fluidised bed which is formed and maintained by the appropriate flow of fluidising air from which the final granules are poured into the collector under excess pressure and then unloaded from it.

EFFECT: simplification and cost reduction of maintenance of unloading final granules from collector; secure preparation and preservation of monodisperse final granules of specified size.

7 cl, 3 dwg

FIELD: technological processes.

SUBSTANCE: invention concerns granulation method in fluidised layer for various substances, such as carbamide, ammonium nitrate, ammonium chloride and similar substances viable to granulation. Particularly invention concerns method of granulation in fluidised layer with temperature adjusted by hot air feed, and to granulation plant for implementation of the method. During granulation of a certain substance in fluidised layer at adjustable temperature, finished hot granules are selected from fluidised granulation layer and cooled down in fluidised cooling layer continuously formed and sustained by fluidising air flow. At least a part of fluidising air leaving cooling fluidised layer of finished granules is fed to fluidised granulation layer. Cooling and granulation fluidised layers are positioned in sequence against air flow passing through them. Granulation plant used in the described method includes self-carrying construction with partition serving as support for fluidised granulation layer. Under the partition a step away from it, a base-forming sheet serving as support for fluidised cooling layer is located. Fluidised granulation and cooling layers interface over a perforated, grid, mesh or other gas-permeable partition. Finished granules are poured from fluidised granulation layer into fluidised cooling layer over transition stack. Devices of fluidised air feed and distribution in internal cavity of self-carrying construction are located under base-forming sheet.

EFFECT: reduced total energy expenditure required to maintain fluidised layer temperature at specified level sufficient for optimal granulation process finish.

10 cl, 2 dwg

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