Installation for production of granulated products

FIELD: machine building.

SUBSTANCE: installation for production of granulated products consists of vertical cylinder case, of gas distributing grid, of grid of boiling layer, of vertical gas supplying branch coaxially installed in this grid, of branch supplying air under grid, of sprayer for sputtering pulp or melt, of branches for supply of disperse material, of branch for granules unloading and of axial gas withdrawing branch. Also, the installation includes coaxial truncated cones, the internal of which is secured on the vertical gas supplying branch and grid of boiling layer, while the external one is attached to the grid of the boiling layer and cylinder case. In an upper part of the installation there is installed a separation zone consisting of three parts: two conic ones and one - cylinder; a stop is installed inside the separating zone; the stop corresponds to two cones; the upper cone has bigger height, while the lower one has lower height; the bases of cones are interconnected.

EFFECT: intensified process of drying, reduced dust carry over, and upgraded quality of product.

4 dwg

 

The invention relates to inorganic chemistry, in particular to a device for drying and granular material, and may find application in the production of mineral salts and fertilizers, granulated calcium chloride.

Know the use for drying of solutions and suspensions spray dryers, for example, according to German patent [DE No. 2125945] the spray dryer consists of a camera equipped in the upper part of the nozzle to enter dryable material, cylindrical glass, and a gas exhaust manifold, and in the lower part of the distribution grid and heat to dried in a fluidized bed of granules, and the glass is placed between the camera and exhaust manifold and provided with a tangential gas injection nozzles.

The disadvantage of this dryer is the design complexity and large pylones.

Known apparatus for producing granulated products, comprising a vertical cylindrical casing, gas grill, fortified it vertical gas-feeding nozzle located inside the nozzle for spraying the slurry or melt, a nozzle for supply under the gas grill, axial exhaust pipe connected to the upper part of the casing, a pipe for supplying dispersed material and a nozzle for discharging granules, characterized in that order stand the deprivation of performance, the device is equipped with additional gas-feeding pipe tangentially mounted in the upper part of the body, suction elbow provided with a conical funnel with a cylindrical shell at its end and with an inner cone, vertical gas-feeding pipe is placed along the axis of the casing, and the upper end is located above the gas distribution grid at the height of the fluidized bed [SU # 1192216, IPC B01J 2/16, 1980].

The disadvantages of this device include low productivity and relatively large pylones.

Known apparatus for the dehydration of calcium chloride, comprising a vertical casing, accommodated in the housing unit of the spray solution and located underneath the gas distribution device, connections for inlet and outlet of the gas-coolant supply source of liquid and output of finished products [SU # 1561991, IPC WV 1/18, 1988].

The disadvantages of this apparatus should also include the design complexity and large pylones.

Known apparatus with fluidized bed created by the flow of the combustion gases by spraying in a fluidized bed at a temperature of 150-200°C and the velocity of the flue gases of 2.5-3.0 m/s solution of calcium chloride with a concentration of 30-32%, previously brought to a concentration of 38-45%, by evaporation and further dissolving the dust is o fractions, carried from the drying apparatus, formed in the fluidized bed is heated granules, followed by dehydration and crystallization are dissolved in a solution of the compounds [RU №2200710, IPC C01F 11/24, 2002].

The disadvantages of this apparatus should include a large pylones, low productivity, the demand is quite high initial concentration of the solution.

Known spouted bed dryer containing the drying chamber and are placed coaxially inside the box, where the drying chamber consists of a chamber drying and final drying chamber material, the insert is made in the form of coaxially spaced sockets, the upper base being located at different distances relative to each other, increasing in height from the main socket to the peripheral, and peripheral socket has a smaller length and at the base of the radial outlet openings communicating with the Central socket and the base of the middle socket is connected to the camera pre-drying of the material through the annular slots in its upper part, and the bells done in the top half of the hyperboloid of rotation [RU No. 2182298, IPC C01F 11/24, 2001].

The disadvantages of this device is the design complexity, large pylones, the buildup on the surfaces of the sockets.

Most BL is skim technical solution is the apparatus for producing granulated products comprising a vertical cylindrical casing, gas grill, fortified it coaxial vertical gas-feeding nozzle, tangential gas-feeding nozzle, installed in the upper part of the body, a nozzle for atomization of the slurry or melt inside vertical gas-feeding pipe, the upper end of which is located above the gas distribution grid at the height of the fluidized bed, axial exhaust pipe connecting the upper part of the casing and provided with a conical funnel with a cylindrical shell at its end and with the inner cone nozzle for supplying dispersed material and a nozzle for discharging granules, characterized in that, to improve performance, gas grill provided coaxially arranged truncated cones, the inner of which is mounted on a vertical gas-feeding pipe, and the outer fixed on the distribution grid, while the outer end of the truncated cone is located below the face of the vertical gas-feeding pipe, a pipe for supplying dispersed material is installed in the upper part of the body, above the lower edge of the tangential gas supplying pipe, and the end face of a cylindrical shell located below the end of the inner cone [RU No. 2060810, IPC C01J 2/16, 1996]

The disadvantages of this device are high pylones and low thermal efficiency, which limits the possibilities of intensification of the drying process.

An object of the invention is to intensify the drying process and reduce pylones, as well as improve the quality of the product.

The problem is solved in that the apparatus for producing granulated products, comprising a vertical cylindrical casing; gas grill; grill fluidized bed, fortified it coaxial vertical gas-feeding pipe, the upper end of which is located above the fluidized bed grate at the height of the fluidized bed; a pipe for supplying air under the grate below the gas distribution grid; a nozzle for atomization of the slurry or melt, is placed coaxially inside a vertical gas-feeding pipe; coaxial spaced truncated cones, the inner of which is mounted on a vertical gas-feeding nozzle and the grate of the fluidized bed, and the outer fixed on the grate of the fluidized bed and the cylindrical housing while smaller base of the outer truncated cone is located below the upper end of the vertical gas supplying pipe; a pipe for supplying dispersed material installed above the height of the bales in the corresponding layer; nozzle for discharging granules; axial exhaust pipe connecting the upper part of the separation zone; in the upper part of the apparatus installed the separation zone, consisting of three parts: a conical, cylindrical and conical, inside the separation zone is installed bumpers, representing two cones of different heights (larger top and a smaller bottom)interconnected on the grounds, and the geometrical parameters of the separation zone are determined by the formulas below

where S1, S2square ring sections formed by the inner wall of the cylindrical part of the separation zone and the bases of the cones forming the bump (S1) and the upper truncated cone separation zone and the upper cone bump stop (S2), m2;

VDG- the total flow of flue gases (gases generated by the combustion of natural gas or other fuel and enters the dryer through the vertical gas-feeding nozzle and air under the grate (supplied through a branch pipe for supplying air under the grate), nm3/s;

G - performance dryers in the evaporated moisture, kg/s;

- molar mass of water, the mole;

Vmol- the volume of 1 mole IG (Vmol=22,4·10-3·m3/mol);

Ttop- the temperature of the top of the dryer (the temperature of the gases in the exhaust pipe, established in the upper part of the separation zone);

ωO.Sthe deposition rate of the particles of the granulated or dried material, depending on the density and size of solid particles of the granulated or dried material and physical properties (density, viscosity), andspeed (mean speed of the gas flow in the annular cross sections of S1and S2gas flow is determined by the deposition rate on the well-known in the technical literature dependencies, m/S.

The diameter of the cylindrical part of the separation area DS.Z.m

where D2- diameter bump stop (assuming a diameter of the bases forming the bump cones), m

The diameter of the bump D2, m, is taken from the condition

where d1the inner diameter of the apparatus for producing granulated products, m;

d2- inner diameter of the gas exhaust pipe connected to the upper part of the separation zone, m

The angles of the forming cones α and β are taken from the condition

α=β≥2·φ,

where α is the angle of inclination of the generatrix of the lower truncated cone separation zone to its base, deg;

β is the angle of inclination of the generatrix of the upper cone (cone of greater height) bump stop, deg;

φ is the angle of natural is on a slope, obtained in the granulation process in the apparatus or drying of the material (is the reference value is set empirically and depends on the coefficient of friction, roughness of the grains, the degree of moisture, particle size distribution and shape, as well as from the specific weight of the material), grad.

1 shows apparatus for producing granulated products.

Figure 2 shows a General view of the device.

Figure 3 shows a section "a-a" of the device.

4 shows an external element "B".

The apparatus comprises a cylindrical housing 1; the gas distribution grid 2; a fluidized bed grate 3; vertical gas-feeding pipe 4; a pipe for supplying air under the grate 5; a nozzle for atomization of the solution 6; inner truncated cone 7; outer truncated cone 8; nozzles dispersed material 9, 10; a nozzle for discharging granules 11; exhaust pipe 12; the separation zone 13; the baffle 14.

Apparatus for drying and granulating solutions and suspensions is as follows.

The original solution enters the apparatus through the nozzle 6, which carries out its spray in the area spouted bed. Gushing layer is created by the flow of fluid produced by the combustion of natural gas or other fuel and dilution of the combustion products with air, and coming through the vertical the material gas supplying pipe 4. Due to the high temperature, and flow rate of the coolant supplied to the device, a part of the original solution dries instantly with the formation of the fine product that embraces the upward flow of fluid and rapidly swept up. In order to reduce the number of particles of material carried away from the apparatus, and to return it to the area of the spray solution, for further growth of the granules in the upper part of the apparatus installed fractionation zone 13 within which is mounted the baffle 14. Granules of various sizes moving in a flowing layer at high speed, reaching a bump, fall within the zone of compacted environment - the so-called "gas cushion"in front of the baffle 14 and accordingly begin to lose their speed. As a result of this unit, the gas flow through the exhaust pipe 12, carried only a very small granules materials, which are then recovered dust (determined after drying) equipment and returned for further granulation through pipes 9 and 10. Larger granules slow down in the zone "gas cushion", however, are carried away from the apparatus, and hit the bump. Shock occurs, the compaction of the granules, they become more solid and smooth surface. Hit the bump 14, the ranula bounce from it to the walls of the cylindrical body 1 and along them settle in the zone of the fluidized bed. Fluidized bed is required for classification of the product (blowing small granules from the fluidized bed, to prevent premature discharge them from the machine, pellet feed material into the zone of the spray solution in order to further their growth and drying, and unloading of the commodity granules from the apparatus through the pipe for discharging granules 11. Thus, drying and granulation in the apparatus at the expense of repeated recirculation of particles from the zone of boiling zone spouted bed and back.

Fluidized bed is created by air flow through the pipe to supply air under 5 distribution grid 2. A distributive lattice is required for uniform distribution supplied through the pipe 5, the air flow over the cross section of the apparatus in order to ensure uniform height of the fluidized bed in the fluidized bed grate 3.

For better separation of the granules according to the height of the fluidized bed depending on their size inside the dryer has two coaxially arranged truncated cones 7 and 8. Truncated cones are arranged in such a way as to increase the flow area for the passage of air coming out of the holes of the grate of the fluidized bed in the direction of its movement. By increasing the flow area gradually decreasing the air velocity is high q which may for effective granulation classification of the granules. Pulverized granules are blown out of the boiling zone in the area spouted bed. Small granules are at the upper limit of the fluidized bed and into the area of spray solution fed through the nozzle 6, and then are captured in the flowing layer and pass into the separation zone to bump. Granules are medium in size located in the middle part of the fluidized bed, and their growth is due to the buildup on the surface of small wet granules from the upper part of the fluidized bed. Large granules, and granules of medium size located in the lower part of the fluidized bed and is gradually discharged from the apparatus through the pipe 11. After unloading occurs classification paged product into fractions, then medium, and small granules are returned for further granulation in the apparatus through the pipes 9 and 10.

Dust-Laden gases, representing a mixture of flue gases, air supplied under the grate, and a certain amount of pulverized granules of the product are removed from the apparatus through the exhaust pipe 12.

Thus, in comparison with the prototype, the proposed device has the following advantages:

- more simple design due to the exclusion of the construction of the unit tangential gas supplying pipe;

- reduced pylones;

- obtained granules have a higher fur the technical properties;

- high performance;

- higher thermal efficiency.

Apparatus for granular products, comprising a vertical cylindrical casing, a gas-distributing grate, fluidized bed grate, fortified it coaxial vertical gas-feeding nozzle, the upper end of which is located above the fluidized bed grate at the height of the fluidized bed, a pipe for supplying air under gas distribution grid located below the gas distribution grid, burner for atomization of the slurry or melt, is placed coaxially inside a vertical gas-feeding nozzle, coaxial spaced truncated cones, the inner of which is mounted on a vertical gas-feeding nozzle and the grate of the fluidized bed, and the outer fixed on the grate of the fluidized bed and the cylindrical housing, while the smaller base the outer truncated cone is located below the upper end of the vertical gas supplying pipe; a pipe for supplying dispersed material installed above the height of the fluidized bed, a pipe for discharging granules, axial exhaust pipe connecting the upper part of the separation zone, characterized in that the upper part of the apparatus has a separation zone, consisting of three parts: a conical, Qili the shape and tapered, inside the separation zone is installed bumpers, representing two cone: the top - most height and bottom - less height, interconnected on the grounds, and the area of the ring sections and the diameter of the cylindrical part of the separation zone are determined by the formulas below:

where S1, S2square ring sections formed by the inner wall of the cylindrical part of the separation zone and the bases of the cones forming the bump (S1), and the upper truncated cone separation zone and the upper cone bump stop (S2), m2,
VDG- the total flow of flue gases and air under gas grill, nm3/s
G - performance apparatus for producing granulated products evaporated moisture, kg/s,
- molar mass of water, the mole;
Vmol- the volume of 1 mole of an ideal gas, Vmol=22,4·10-3m3/mol;
Ttop- the temperature of the gases in the exhaust pipe in the upper part of the separation zone, To;
ωSthe deposition rate of the particles of the granulated or dried material, depending on the density and size of solid particles of the granulated or dried material and physical properties - density, viscosity, and the velocity of the gas flow is in the annular cross sections of S 1and S2m/s;

where DSz- diameter cylindrical part of the separation zone, m;
D2- diameter bump stop, m, and D2taken from the condition

where d1the inner diameter of the apparatus for producing granulated products, m;
d2- inner diameter exhaust pipe, m;
and the angles of the forming cones of α and β, forming a separation zone, taken from the condition
α=β≥2·φ
where α is the angle of inclination of the generatrix of the lower truncated cone separation zone to its base, deg;
β is the angle of inclination of the generatrix of the upper cone bump stop, hail;
φ is the angle of repose dried material obtained in the granulation process in the apparatus, and φ is the reference value.



 

Same patents:

FIELD: technological processes.

SUBSTANCE: invention relates to the field of chemical technology and may be used to produce granulated sodium arsenite in processing of reaction mass produced at the stage of alkaline hydrolysis of lewisite. Liquid reaction mass is exposed to continuous convective spraying drying in fluidised bed. Process is carried out at the temperature of layer 70÷150°C and at underpressure of 10÷200 mbar, and nitrogen is used as fluidised and spraying agent.

EFFECT: invention provides for hardware and structurally simple, technologically and ecologically safe process applicable for large-capacity production of granulated sodium arsenite suitable for long-term storage.

3 cl, 1 dwg

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

FIELD: production processes.

SUBSTANCE: invention refers to method of substance granulation in fluidised layer and granulator for its implementation. Method consists in the following: by means of fluidising air fluidised layer of granules of granulated substance which is supplied to fluidised layer in the form of inoculating seeds is formed and substance or liquid for granules growing are continuously supplied to fluidised layer. Fluidising air flow is divided into many flows which are supplied to various zones of fluidised layer with different rate within limits from minimum in first zone, enough for maintaining fluidised layer, to maximum in second zone, required for formation of circular motion, actually, eddy motion of granules of granulated substance in fluidised layer and its maintaining around horizontal axis.

EFFECT: method of granulation in fluidised layer and granulator for its implementation (versions) is described.

10 cl, 6 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to production of granular calcium chloride, which can be used in communal and road facilities. The method of producing granular calcium chloride involves preparation of a concentrated solution of calcium chloride from evaporated clarified still waste liquid from ammonia-soda production and subsequent dehydration and crystallisation. Non-ionic surfactant is added to the clarified still waste liquid and then evaporated to concentration of calcium chloride of 35-45%, after which it is taken for dehydration and crystallisation in a boiling-spouting drier-granulator. The spouting bed in the drier-granulator is created by a stream of furnace gases, fed through a central inlet at a rate of 50-55 m/s at temperature 700-750°C, and the boiling bed is created by an air stream at temperature 20-60°C, which is fed at a rate of 3-5 m/s.

EFFECT: intensification of the drying process, recycling still waste liquid, obtaining granular calcium chloride.

6 cl, 1 dwg, 1 tbl

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

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

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: 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: 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: 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: production of powdery materials.

SUBSTANCE: the invention presents an installation with a fluidized layer and with a complex spray drying and a method of production of the powdery materials dried with the help of a spray drying, whose properties can be varied purposively depending on the application. The installation contains a spraying column, a fluidized layer, a module of a spray drying, one or several of additional spraying or pulverizing nozzles for a liquid component located in a fluidized layer, a batching gear for a powder and a powder returning gear with a fan. The module of a spray drying includes a spraying system consisting of a heated doublet spraying nozzle in which a liquid) component and sputtering air are merged. The installation contains also a dynamic filter integrated in it used for clearing of the gas of from a part of a powder. The spraying column is located above the fluidized layer. The latter for giving direction of motion of the stream of a powder it is supplied with a perforation in Conidur base. The module of a spray drying is located in the spraying column above a fluidized layer. The doublet spraying nozzle is supplied with the coaxially located powder returning gear and an enveloping stream of hot air. The spraying system is made in the form of an integrated module. In the method of production of a powdery material at the first stage the following components are combined: a liquid component, a spraying gas, a powdery material and hot air. The formed powdery product falls on a fluidized later, is caught up, fluidized and transported further. At one or more stages of granulation it is pulverized with an additional liquid component, dried and transported with the fluidized layer to the powder batching gear, from which a part of the powdery material is returned in the process. The invention ensures fast removal of surface moisture, prevention of granules adhesion and production of particles of the given size.

EFFECT: the invention ensures fast removal of surface moisture, prevention of granules adhesion and production of particles of the given size.

14 cl, 2 dwg

FIELD: inorganic compounds technologies.

SUBSTANCE: invention relates to fluidized-bed manufacture of granulated calcium chloride from solution. Process comprises providing concentrated calcium chloride solution dehydration and crystallization thereof to form granules in fluidized-bed furnace by way of feeding solution into furnace in countercurrent to furnace gas produced by combustion of natural gas with air in combustor. Granules are then cooled and emission gas dust is trapped and returned into the solution concentration stage. According to invention, concentrated solution, prior to be fed into fluidized-bed furnace, is preheated by furnace gas by circulation of solution in the tank-pump-heater system. Finished product, prior to be cooled, is divided into two portion. One portion is sent to calcium chloride concentration stage and resulting mixture is circulated in the tank-pump-heater system, whereas the other portion is used to cool finished product.

EFFECT: increased productivity of calcium chloride granulation process and installation.

12 cl, 1 dwg

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

SUBSTANCE: the invention is pertaining to the devices for coating of different loose materials and may be used in chemical industry and chemical-pharmaceutical industry for protective coating of fragments of a loose material, for example, for encapsulation of granules of sodium percarbonate used as a bleaching component in a composition of cleansers for prevention of a contact of the active substance of sodium percarbonate with other components of the cleanser and increasing of the active substance storage duration. The coater contains a work chamber, injectors for feeding of liquid components, a dosing device of the loose material, branch pipes of feeding-withdrawal of the heat transfer agent and withdrawal of the end product. The body of the work chamber is made sectional and consists of a spring-loaded box with a gas-distributing grate and a retractable hood covering the box and not touching its walls. The work chamber has two work sections: a section of deposition of the liquid component and a drying section separated by a non-blind vertical septum and a butterfly gate. The vertical septum is mounted above the gas-distribution grate with a backlash, and the butterfly gate - under a gas-distribution grate. The shaft of rotation of the butterfly gate is located opposite to the septum. The gas-distribution grate is mounted with a capability of variation of an inclination angle. In the second version the body of the work chamber is made non-detachable, and the gas-distribution grate with a vibrator is independently fixed on the remote spring suspensions and is supplied with compactors. 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.

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.

FIELD: methods of granulation of carbamide, for example in fluidized layer and fluidized-bed granulators.

SUBSTANCE: proposed method includes forming fluidized bed of seeding particles (S1) of agent to be granulated with essentially horizontal plane (P) and delivery of continuous flow (L) of fluid medium containing mother liquor at simultaneous forming of solid vortex (V) in fluidized bed with essentially horizontal axis, upper zone (Z1) where seeding particles are humidified and solvent contained in mother liquor is evaporated and lower zone (Z2) where mother liquor is hardened.

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

Up!