Device to process powder material

FIELD: process engineering.

SUBSTANCE: invention relates to device (10) intended for processing powder materials that incorporates work chamber (16) to process material therein. Device bottom (18) is formed by several overlapping circular guide plates (22-24) arranged one above the other. Circular slots (25, 26) formed there between allow work air to flow there through. At the center of said bottom (18) there is circular-slot-like nozzle (30) with its sprayer can spray fluid in the form of flat jet (44), approximately, parallel to bottom plane.

EFFECT: optimum transfer of powder material particles and material processing.

9 cl, 2 dwg

 

The present invention relates to a device for processing powder (or dispersed or granular) material, having a working chamber for processing in her powdered material with a bottom which is formed by several spaced one above the other mutually overlapping annular guide plates between which is formed an annular gap for flow through them working air directed radially outward of the horizontal component of its motion.

Such a device is known for example from DE 10248116 B3.

Such known devices are used for drying or granulating powdered material or the coating on the particles. In these devices through the bottom into the working chamber is supplied gaseous medium, the so-called working air that comes in the working chamber approximately in a horizontal direction through a lot of the annular gaps between the mutually overlapping guide plates. Mutually overlapping annular guide plates between which is formed by numerous circular cracks, creating in the chamber moving radially outward flow of air, say no to the wall of the working chamber up. The particles of processed material captured at the same time these air flow, however, p is on the influence of their own gravity fall on the center of the device and again get support pillow formed a working air. When additional diverting flow of the working air is still and in the circumferential direction gradually formed toroidal rotating ring vortex flow.

If necessary, the education of the pulverized powders of larger agglomerates, i.e. optionally granulating the processed material, in such a rotating toroidal vortex flow through a nozzle is additionally sprayed adhesive environment. For example, according to the above publication DE 10248116 EOI in limiting the working chamber of the vessel wall is inserted facing obliquely upward spray nozzle.

In the coating on the particles of processed material of the coat should be applied, i.e. naprashivaetsa, already krupnicza the most uniform particle layer.

Currently known nozzles wide variety of designs, which are based on the same General principle, consisting in a thin dispersion of a normally liquid or powder processing material spray the air in the form of fog and smoke. To this end, known to use, for example, a slit nozzle, spray gun which has a slit outlet for flow through him fluids under high pressure and outlet openings for spraying the air is, which can be located either on one side or on both sides of the slotted outlet opening for the liquid.

From the publication DE 10232863 A1 is known a spray nozzle with a circular cross-section of flow channels. Depending on the spray angle and the angular extent of the sector atomization of a liquid jet of sprayed liquid may have a beam, conical, or more or less flat shape. When the angle of dispersion equal to 180, and the angular extent of the sector of spray liquid, equal to 360, is formed almost flat jet spray.

When handling powdered material according to this technology, which is widely used in the pharmaceutical industry, strive to provide maximum uniform result, i.e. when granulating - obtain granules with an extremely narrow particle size distribution and in the coating is applied to all particles one of which is located in the installation party the most uniform coating layer, i.e. the first layer of constant thickness. A serious problem with which we have to face is that the uncontrolled chaotic movement of particles of the processed material, moistened with moisturizing and usually adhesive spray liquid, stick together with each other with education is m unwanted agglomerates.

For this reason, it is advisable to provide a well-defined nature of the movement flows in toroidal rotating flow of the treated material to obtain optimum results it is processed. Thus, in particular, it is expedient to provide the movement of the particles of the processed material after wetting wetting liquid along the trajectories on which they were away from each other at the maximum possible distance, but not close to each other to avoid the formation of undesirable agglomerates.

Based on the foregoing, the present invention was based on the task to improve similar devices for handling powdered material in a way to ensure optimal transfer of particles of powdered material to achieve the optimal result of its processing.

This task in relation to the device specified in the beginning of the description type is solved according to the invention due to the fact that in the bottom center there is a circular slit nozzle, the nozzle which is arranged to spray the liquid in the form of a flat jet, approximately parallel to the plane of the bottom.

With the invention it has been unexpectedly found that the use of such annular slit nozzle in combination with a bottom formed number is avimi guide plates, extending through slots between which the flow of air moves radially outward, provides optimum air movement and processed material. Emerging from the annular gap between the annular guide plates work the air forms a sort of sliding over the bottom of the radially outward support cushion that moves the particles of processed material radially outward in the space of continuously increasing volume, i.e. creating conditions under which the particles of processed material as their radial distance from the center of the bottom away from each other.

Directed wall up along it working air entrains the particles of processed material and carries them upwards. In subsequent particles of the treated material is separated from the downward flow of air are moved radially inwards towards the centre and under their own gravity fall approximately in the center of the support cushion formed a working air coming from cracks in the bottom. Due to the atomization of a liquid provided on the center of the annular slit nozzle in the form of a flat jet impinging particles of material to be processed is uniformly wetted by the liquid, and then immediately move radially outward beam flow is Contracting flow, i.e. away from each other. Thus, the particles of the processed material during its vertical drop purposefully wetted by the sprayed liquid, then captured moving below the flow of the working air, forming a support pillow, and move them radially outward. In other words, after the exit of the jet of sprayed liquid wetted particles of material to be processed further first move in a horizontal direction radially outward, then vertically up and after that once again moving down the path to the center, having time to dry the flow of air and accordingly strengthen its positions until you hit a jet of sprayed liquid. Uniform wetting of all falling in the center of the particles of the processed material sprayed liquid is ensured thanks to its spray in a circle, i.e. in the sector with an angular length equal to 360.

With the invention it has been unexpectedly found that such a combination can provide a uniform optimal handling powdered material. Thus situated at the center of the annular slit nozzle atomizes the liquid in the form of some kind of "underlying layer". Falling jet of sprayed liquid particles of the processed material fun what are the flow of air, forming a supporting cushion, and are highly efficient and uniform processing.

Even when the experimental treatment of powdery material very large portions, the weight of which was reached 650 kg, the process of granulation, coating particles and drying proceeded in conditions close to ideal. Thanks created at the bottom of the support cushion is completely eliminated contact with the bottom surface of the powdered substance, i.e. all the powdered substance gets on the particles of processed material. This eliminates loss of the sprayed substance that is essential especially in the pharmaceutical industry.

In one of the embodiments of the invention between the spray ring slit nozzle and located underneath the bottom outlet openings provided for supporting air, forming with the lower side of the jet spray supportive pillow.

It is well known that directly from the outlet of the atomizer creates a certain pressure, which leads to the accumulation of processed material near the outlet of the nozzle. When forming the above jet spray similar problems with its upper side does not occur, since the incident on the center of the astitsy processed material immediately captured by the jet of sprayed liquid and pass it in the horizontal direction. However, with the lower side of the jet of sprayed liquid such zones of rarefaction could lead to a gradual accumulation of particles at the outlet of the nozzle. Thanks to the presence of the above additional output holes for air from the bottom of the jet spray creates a thread supporting air from the bottom side of the jet spray "blows" the zone at the outlet of the spray ring slit nozzle. The additional effect of creating such a thread supporting air is that supporting the air effectively forms a support for the coming out of the spray ring slit nozzle flat jet spray liquid from its lower side, i.e. prevents unwanted movement of the jet spray down under the action of gravity or due to the formation of the jet of sprayed liquid with a sectional conical shape. This eliminates loss of the sprayed substance, respectively subsidence adhesive material on the upper side of the bottom.

In the following embodiment of the invention the supporting air is coming out of the annular slot nozzle air and/or process air.

This option provides a wide variety of ways to create a thread supporting air So for example, to create a thread supporting air, you can use some spray air with appropriate outlet openings for air to the annular slit nozzle. Additionally or alternatively be sent to the underside of the jet of sprayed liquid part of the working air passing through the bottom, and thereby to create a thread supporting air.

In the following embodiment of the invention the annular slit nozzle has a head approximately conical shape, and the outlet of the spray ring slit nozzle passes through the circular ring section line of the cone.

The advantage of this variant is that due to this conical head vertically falling particles of the processed material, sliding on it, evenly, smoothly and purposefully act in a jet spray, spray a circular spray slit at the lower end of the conical head.

In the following embodiment of the invention in the area between the spray ring slit nozzle and located underneath the bottom is has a shape of a truncated cone skirt with a through hole for passage of the supporting air.

The advantage of this variant is that the above deviation particles amrabat the excavated material to the surface of the conical head and continues over a skirt in the shape of a truncated cone, extending through the through hole in which the supporting air is in this area suitable support for the jet of sprayed liquid from its lower side.

In the following embodiment of the invention under the lower edge having the shape of a truncated cone skirt, formed an annular gap for the passage of the working air.

The advantage of this variant is particularly effective and focused management beginning in the immediate area under the nozzle passage of the particles of the processed material on the support cushion formed at the bottom.

In yet another embodiment, the invention over the annular slit nozzle is located the outlet of the inlet channel, designed to supply additional substances.

In the claimed invention, it was found that the harmonious flows provided by annular slots in combination with the annular slit nozzle, you can extremely effective feed additives. Therefore, when forming the jet spray it directly on the center can, for example, to apply the powder, which firmly adheres to moist spray nozzle fluid and became thus the adhesive surface of the particles of the processed material. So the m can provide a quick increase in the thickness of the coating layer, applied to the particles of processed material. This advantage is not the only one. Another significant advantage is the possibility of filing, for example, biologically active substances that are sensitive to moisture and which therefore does not allow its processing in suspension or in solution and spraying through the annular slit nozzle. In this case, through the annular slit spray nozzle only "sticky" substance and in fact biologically active substance in powder form is available in the centre. Such submission of additional substances, which, obviously, from the aerodynamic point of view is optional, requiring consideration of the option, to the extent possible, as mentioned above, the annular slots in the bottom in combination with the annular slit nozzle allows you to create in the working chamber flows with strictly defined and harmonious nature of their movement.

In the following embodiment of the invention between the annular guide plates are guiding elements, additionally deflecting the flow passing through the bottom of the working air in the circumferential direction.

The advantage of this is in principle well-known solutions consists in the possibility of additional deflecting the air stream such guide element of the mi in the circumferential direction to create this by rotating toroidal flow evenly swirling particles of the processed material, thanks evenly then come in flat jet spray.

It is obvious that the above described and discussed in the subsequent description of the distinguishing characteristics can be used not only in their specified but also in other combinations or even alone without going beyond the scope of the invention.

Below the invention is described in more detail on the example of some variants of its implementation with reference to the accompanying drawings on which is shown:

figure 1 is a simplified view in longitudinal section of the device for handling powdered material and

figure 2 is a view in section of the device for handling powdered material from an additional supply of other material.

Shown in figure 1 a device for handling powdered material indicated the total item 10.

The device 10 has a container 12 with a tall cylindrical vertical wall 14. This wall 14 restricts the corresponding working chamber 16.

The working chamber 16 has a bottom 18, which is the chamber 20 for supplying the working gas.

The bottom 18, the construction of which is known, for example, specified in the beginning of the description publication DE 19248116 B3, consists of a total of ten ring located ledges, one above the other guide plates. These ten guiding plates is aspolozhena one above the other so the bottom plate is radially external, connected with the wall 14 of the annular guide plate, above which are the other nine radially inner annular plates, each of which partially overlaps with the directly below her plate.

To simplify the drawing positions it is equipped with only some of the guide plates, in particular two located one above the other guide plates 22 and 23. Due to such arrangement of the guide plates one above the other indented from each other between each pair of adjacent guide plates formed by the annular gap 25 through which the working air 28 enters with directed radially outward of the horizontal component of its motion through the bottom 18 into the working chamber, as is basically known from the prior art. In the Central opening in the center, the upper radially inner guide plate 24 inserted from below the annular slit nozzle 30. This annular slit nozzle 30 has a nozzle 32 with a total of three output slots 33, 34 and 35. All these three output slots 33, 34 and 35 are oriented so that they provide atomization of the liquid is approximately parallel to the plate 30, i.e. approximately in the horizontal plane, within the sector angular length equal to 36. Through the upper output gap 33 and through the lower output gap 35 is supplied under pressure spray air, and through the middle slot 34 is served sprayed liquid.

The annular slit nozzle 30 has starinavity housing 36, which passes downwards and inside of which there are appropriate channels and supply line, as is in principle known from the prior art. Such annular slit nozzle can be performed, for example, in the form of a spray device, known from the publication DE 10232863 A1.

Such annular slit nozzle can be performed, for example, with the so-called rotating annular gap, in which the walls of the channel through which atomized liquid, rotate relative to each other in order to avoid clogging of the channel in the work and to ensure thereby a uniform spray of liquid through the output slit 34 in the entire sector of angular extent equal to 360. Thus, relative to the longitudinal axis of the housing 36 of the annular slit nozzle 30 spray angle is 180.

Over its output part 32 of the annular slit nozzle 30 has a conical head 38.

Under the dispenser 32 of the annular slit nozzle is provided having the shape of a truncated cone wall or skirt 40 with lots of holes 42. As shown in figure 1, the skirt 40 of the bottom part of peracre is moved from below it radially inner guide plate 24 and a few did not reach her education in the result between the bottom edge of the skirt 40 and this guide plate 24 of the slit 26, through which the working chamber can pass through the working air.

Figure 1 is a right arrow symbol character displacement flows in steady mode.

Coming out of the dispenser 32 jet 44 of sprayed liquid has a flat shape. Coming out of the holes 42 in the conical skirt 40 of the air, which can represent, for example, working air, forms the bottom side of the jet 44 sprays supporting air stream 46. Coming from a variety of slots 25, 26 working air 28 forms a radial flow directed toward the wall 14, where it is deflected upward as indicated by arrow 48 direction. The particles of the treated material is separated from the working air that is discharged through the exhaust holes and the particle vorticity of the processed material moving radially inward and under their own gravity vertically falling on the conical head 38 of the annular slit nozzle 30. After contact with the conical head of the falling particles of material to be processed smoothly change the direction of its movement, are directed to the upper side of the jet 44 of sprayed liquid and processed it sprayed medium (fluid). Dipped sprayed liquid particles in the jet of sprayed liquid, diverge from each other, because immediately the donkey removal from the annular nozzle 32 particles are in the space larger. While in the jet of sprayed liquid, the particles of processed material facing the liquid droplets are removed from each other, continuing to move in the same direction and at the same time extremely evenly and efficiently processed working air dried.

Figure 2 is a perspective view in section similar to the section shown in figure 1, shows a device for handling powdered material, the overall position 50. This device also has a capacity of 52 with a tall cylindrical vertical wall 54, limiting the working chamber 56. The bottom 58 of this device is identical to the plate described above and shown in figure 1 of the device and consists of ten respectively arranged staggered one above the other guide plates, the number of which only two guide plates provided on the drawing as an example positions 62 and 63. Under the bottom 58 and in this case is the camera 60 for supplying the working gas.

In the form shown in the drawing variation between the guide plates are guide members 64 and 65, from which a stream coming out of the cracks between the guide plates 62 and 63 of the working air moves not only strictly radially outward, but deviates somewhat in the circumferential direction of the arrow 68.

In this the m variant, as in the above embodiment, the center also is a corresponding annular slit nozzle 70. In the centre of the annular slit nozzle is located inlet channel 72, which represents, for example, summed up the side of the pipe and the hole 74 which is located in the centre of the ring slot nozzle 70 is accurately aligned to it. The position of the outlet of the inlet channel can be adjusted in height.

This inlet channel can, for example, to give a solid substance in powder form 78 on the upper side of the flat jet spray ring slot nozzle 70 of the liquid.

In both the above versions of the device for handling powdered material of the annular slit nozzle 30, respectively 70 is so designed that even in the process of operation allows you to retrieve it from the bottom of the plate, for example, to check for defects or for any other purpose. Obviously, before removing the annular slit nozzle flow of the sprayed liquid cease, however, you can continue the circulation of the processed material in the device 10, 50 respectively, as in the Central hole is formed a Central upward flow of air, preventing falling of the particles of the processed material in the hole. Such is the first circulation of the particles of material to be processed is also a consequence of quite a whirl, due to toroidal rotation air flow.

1. A device for handling powdered material having a working chamber (16, 56) to handle it powdered material with a bottom (18, 58), which are formed by several spaced one above the other mutually overlapping annular guide plates (22-24; 62, 63), between which is formed an annular gap (25, 26) for feeding through them working air (28, 68) directed radially outward of the horizontal component of its motion, and in the centre there is a circular slit nozzle (30, 70), spray (32) which is made with the possibility of liquid atomization in the form of a flat jet (44), approximately parallel to the plane of the bottom.

2. The device according to claim 1, characterized in that the nozzle (32) of the annular slit nozzle (30, 70) and located underneath the bottom (18, 58) is provided for the outlet (42) for supporting air (46), forming with the lower side of the jet (44) spray supportive pillow.

3. The device according to claim 2, characterized in that the supporting air (46) is emerging from the annular slit nozzle (30, 70) air and/or operating air (28, 68).

4. Device according to one of claims 1 to 3, characterized in that the annular slit nozzle (30, 70) has a head (38) of conical shape, and the outlet hole is spray (32) of the annular slit nozzle passes through the circular ring section line of the cone.

5. The device according to claim 4, characterized in that the area between the nozzle (32) of the annular slit nozzle and located underneath the bottom (18, 58) is having the shape of a truncated cone skirt (40) with through holes (42) for supporting passage of air (46).

6. The device according to claim 5, characterized in that at the bottom edge having the shape of a truncated cone skirt (40) is formed by an annular gap (26) for passage of the working air (68).

7. The device according to claim 1, characterized in that above the annular slit nozzle (70) is located in the outlet (74) of the inlet channel (72), designed to supply additional substances (78) in the form of a powder jet spray.

8. The device according to claim 7, characterized in that the possibility of adjusting the position of the outlet (74) of the inlet channel height.

9. The device according to claim 1, characterized in that between the annular guide plates (62, 63) are guiding elements (64, 65), additionally deflecting the flow passing through the bottom of the working air (68) in the circumferential direction.



 

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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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EFFECT: possibility of obtaining granules in narrow range of granulometric composition.

16 cl, 5 dwg

FIELD: icing protection.

SUBSTANCE: invention relates to production of substances preventing icing and accelerating thawing of snow and ice covers. Agent according to invention represents granules, each of which is made with internal sodium chloride nucleus and having external shell of calcium chloride, the latter additionally containing corrosion inhibitor so that composition of granules is as follows: 10-90% sodium chloride, 10-90% calcium chloride, and 0.5-20% corrosion inhibitor. Spraying of calcium chloride solution onto sodium chloride particles 0.5-5 mm in size is effected successively in direction of movement of sodium chloride particles along drying chamber at 130-150°C and 2-3 m/sec at the beginning to 170-190°C and 3-4 m/sec at the end.

EFFECT: increased melting and permeating power of granules and reduced dust escape and specific power consumption in drying operation.

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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