Fluidised bed granulator

FIELD: chemistry.

SUBSTANCE: invention relates to drying solutions, melts, suspensions and production of granules of different substances and can be used in microbiological, food, chemical and other industries. Fluidised bed granulator comprises a drying chamber. Each pneumatic sprayer comprises a body with supply of sprayed initial material and air, a jet-guiding device and a sprayer, body is made in form of an inverted cup, in bottom of which there is a threaded hole for attachment of axially symmetric body of central cylindrical insert, to inner side surface of housing, in its lower part, is fastened a cylindrical sleeve of jet-guiding device for air supply under pressure to sprayer via annular gap, formed by outer surface of central cylindrical insert and inner surface of sleeve, wherein annular gap is connected to annular chamber, and to central cylindrical insert is coaxially fixed a sprayer, made in form of a conical flared end, in lower part of which, perpendicular to its axis, is rigidly attached an end round plate with at least three conical throttling holes with apex angle of cone, lying in range from 45° to 90°, on side surface of flared end there are at least two rows of cylindrical holes, with axes in planes perpendicular to axis of flared end, and in each row there are at least three holes, jet-guiding device for air supply under pressure to sprayer there is a screw, and is formed by circular screw gap, formed by outer surface of central cylindrical insert and inner surface of sleeve, on which there are helical grooves, wherein helical gap is connected to annular chamber, and inner surface of cylindrical throttling holes, with their axes lying in planes perpendicular to axis of flared end, is helical.

EFFECT: technical result is improvement of drying efficiency.

1 cl, 2 dwg

 



 

Same patents:

FIELD: heating, drying.

SUBSTANCE: invention refers to disperse material drying technologies and may be used in food, microbiological, chemical and other industries. According to the invention, device for loss-free drying includes body with swirling chamber and nozzle, the body is made in the form of feed nipple with central orifice and coaxial cylindrical shell with external thread, connected rigidly to the nipple, while the bottom body part features coaxial nozzle connected to it by a shell with internal thread and made in the form of centrifugal solution flow swirler in the form of cylindrical insert with at least three tangential cylindrical inlet orifices; the shell forms a part of the nozzle and is installed coaxially to the centrifugal swirler with a cylindrical throttle hole in its end surface; the centrifugal swirler is mounted in cylindrical body chamber, thus forming an annular cylindrical chamber for solution feed to tangential inlets of the centrifugal swirler, and is connected to diffuser outlet chamber; tangential inlets are made in the form of channels in tangential direction towards inner surface of the cylindrical insert, and conical cowling is made at the end surface of centrifugal swirler.

EFFECT: improved dryer design.

3 dwg

Spray drier // 2544109

FIELD: heating, drying.

SUBSTANCE: invention refers to disperse material drying technologies and may be used in food, microbiological, chemical and other industries. Solution diffuser in spray drier includes case with swirling chamber and nozzle, plate diffuser is installed in lower part of conical output chamber of diffuser nozzle and consists of at least two plates perpendicular to the nozzle axis and parallel to each other, the first plate features central hole that catches outer cylindrical surface of the nozzle to attach the diffuser rigidly to the nozzle, while the second plate is solid and is attached to the first plate by at least three fastening elements including screw, nut, and calibrated spacer washer installed between the plates.

EFFECT: improved drier performance.

2 cl, 2 dwg

FIELD: heating, drying.

SUBSTANCE: invention refers to disperse material drying in boiling bed and may be applied in aniline-ink industry, food, pharmaceutical, microbiological, chemical and other industries. spray boiling-bed dryer with passive includes body with gas dispersing grate, vibrating plates, passive nozzle, vibration device; collection system with acoustic unit is positioned in the lower body part; solution sprinkler includes hollow cylindrical body consisting of cylindrical part with outer thread and two hollow cylinder-conical bands connected in series and coaxial to the body, nozzle with cylindrical fillet on its conical surface with external thread for nozzle connection to the lower cylinder-conical band of the body; opposite to solution feed side, there is an additional row of jets formed by at least three pairs of mutually perpendicular vertical channels for solution flow and horizontal channels forming output holes of each jet; conical side surface of the nozzle has 90° top angle; cylinder-conical band features two rows of throttle holes, so that hole axis projections on a horizontal surface in these rows are separated by an angle within optimum 7.5-60° range, and internal surfaces of throttle holes on cylinder-conical bands have helical surfaces.

EFFECT: improved dryer performance.

2 dwg

FIELD: heating, drying.

SUBSTANCE: invention refers to drying equipment, particularly to solution and suspension drying device, and can be applied in chemical, food and other industries. Heat exchange unit for atomizing drying includes furnace, dryer body with atomiser, heat exchange tubes, heat exchange unit includes heating and evaporation zone in the lower part and cooling and condensation zone in the upper part, body with heat-insulated walls and three pipes for heated solution inlet and outlet, vertical finned pipe in mixing chamber of the furnace, pressure gauge, safety valve and heat carrier filling tap, excess pressure compensation line for heat carrier filling during unit operation, equipped with valve, and pressure relief vessel with pipe for solution drain to circulation loop; the finned pipe exits the furnace and enters heat exchanger consisting of pipe with larger diameter, exiting the finned pipe, and four longitudinally finned pipes of the same diameter, tilted at 60-80°, so that the pipes are perpendicular to each other; and dryer atomiser includes hollow body consisting of cylindrical part with outer thread for connection to distribution pipeline nipple, two hollow cylinder-conical bands coaxial to the atomiser and connected in series, and nozzle formed by external conical surface and blind end partition perpendicular to the nozzle axis is attached coaxially at the lower body part, nozzle partition features central throttle orifice and at least three orifices tilted at 45° to the nozzle axis.

EFFECT: increased efficiency and economy of the heat exchanger operation and increased production capacity of the drier.

6 dwg

FIELD: heating, drying.

SUBSTANCE: invention is related to the technology of disperse drying of liquids and can be used in processing, food and chemical industries. The device for disperse drying and granulation of milk, where with the purpose of intensification of the drying process and obtaining of dry granular milk with the help of the camera at simultaneous excluding the possibility of balling of product particles on the camera walls, where through the branch pipe, installed tangentially, hot air is supplied, and as a result of the contact of agitated bipolar particles the pellets, according to the invention are formed, the drying camera is a cylindrical device with two heat insulated from outside semicircular elements connected with each other in a vertical plain by resting side ends through electric insulating interlayer, and electrically insulated cover in the top, with pipelines for supply inside of the device of the air and milk dispersed mixture, with located at the angle to the horizontal plain α1 from the one side, and α21 - from another side, using the electrostatic generator the negative charge on the element of the right part of the device, including the pipeline, is provided, and positive charge - on the element of the left part of the device, including the pipeline, and bipolar elements form effect of capacitor with semicircular plates, meanwhile the uniform magnetic field appears so that the velocity vector at move of the dried particle was perpendicular to the magnetic field induction vector, and the charged particles will be moving along the downward screw-shaped pathway, simultaneously bipolar dried particles at interaction with each other, and also with the walls of elements are electrically neutralised.

EFFECT: invention will avoid the effect of balling on walls.

2 dwg

FIELD: heating.

SUBSTANCE: chamber comprises body with cover and vessel with porous walls arranged inside said body and aligned therewith. Said vessel houses nozzles and used heat carrier bleeder with porous working surface and drive. Gates are secured inside said vessel while inert carrier ply is filled in there between to up the heat-and-mass exchange efficiency. Note here that at least two rods are secured to rotary hollow porous cylinder, their axes being parallel with cylinder axis. Extra rods are secured to every rod at 45-90 degrees to up the heat-and-mass exchange between heat carrier and dispersed material Nozzle case has fluid feed channel and sleeve rigidly secured and aligned therewith and provided with atomiser attached at its bottom. Said atomiser is composed by cylindrical two-step sleeve, its cylindrical part being screwed to central core and hollow cone aligned therewith. Said cone is fitted with annular clearance relative to cylindrical sleeve cylindrical surface. Said annular clearance communicates with at least three radial grooves made in said two-step sleeve for communication with annular chamber. The latter is composed by sleeve inner surface and upper cylindrical step outer surface. Note here that annular chamber communicates with case fluid feed channel. Sprayer is rigidly screwed to cone bottom part. Said sprayer is composed by round end plate with bends bent off towards aforesaid annular clearance between nozzle and hollow cone. At least two rows of cylindrical orifices, their axes located in planes perpendicular to cone axis. At least three holes are made in every row. Axes of said orifices of one row are shifted to those of orifices in the other row through 15-60 degrees. Inner surfaces of said cylindrical orifices are furnished with helical grooves.

EFFECT: higher efficiency.

2 dwg

FIELD: machine building.

SUBSTANCE: proposed drier comprises cylindrical drying chamber with nozzles arranged in chord to feed heat carrier, axes of said nozzles being located tangentially to imaginary circle. Besides it incorporates sprayer located in chamber axis. Note here that said drying chamber is composed by two different-diameter cylinders, smaller of which features diameter making 1.0-1.5 of said imaginary circle diameter. Note also that nozzles are located at the distance from smaller cylinder cross-section not exceeding two diameters of the nozzle. Blades are arranged in drying chamber, level with nozzles in planes parallel with chamber axis, at h=aR therefrom and inclined opposite nozzle gas flow, where a is location of nozzles in chord and R is chamber diameter. Said blades can displace in chamber axis and turn in the plane perpendicular to said axis. At least two slotted nozzles are arranged at larger cylinder inner wall. Note that nozzles are arranged in manifolds communicated via pipelines with manifold for feed hot gases and directed tangentially to larger cylinder diameter at contact points between manifold and larger cylinder inner wall. Atomiser comprises cylindrical hollow case with fluid feed channel and coaxial sleeve rigidly coupled with said case and having nozzle secured at its bottom. Said nozzle is composed of cylindrical two-step sleeve. Top cylindrical step of the latter is screwed to central core composed of cylindrical part and hollow cone aligned therewith. The latter is fitted with clearance relative to cylindrical sleeve inner surface. Said circular clearance is communicated with, at least, three radial channels made in said two-step sleeve to communicate with circular cavity formed by sleeve inner surface and top cylindrical step outer surface. Note that circular clearance is communicated with case fluid feed channel. Sprayer is screwed to cone bottom. Said sprayer is composed by round end plate with edges bent towards said circular clearance. Note here that at least two rows of cylindrical orifices are made in the cone side surface in planes perpendicular to cone axis. Each row has, at least, three holes. Axes of aforesaid throttling holes of one line are displaced relative to those of the other lines through the angle varying from 15° to 60°. Helical grooves are made on cylindrical orifice inner surface, at cone side surface, and features axes located in the pane perpendicular to case axis.

EFFECT: higher efficiency and quality of drying.

3 dwg

FIELD: machine building.

SUBSTANCE: drying plant for solutions, suspensions and paste-type materials consists of a housing with a spraying chamber arranged in its upper part and equipped with an injector and a header for supply of heat carrier, a drying chamber with a vibro grain mill located in the central part of the chamber, and a heat carrier gas distribution system. Drying plant also includes solution supply and spent heat carrier cleaning system. Gas distribution system is equipped with two gas-distributing units: top and bottom. Top unit supplies heat carrier to spraying jet root and is designed for uniform distribution of heat carrier along the sprayed material jet. Bottom gas distributing unit allows for supplying heat carrier to the lower part of the housing, where a gas-distributing grate is installed. The grate is provided with nozzles to supply secondary heat carrier and a chute for granules discharge. Vibro grain mill is installed in central part of the housing in the form of a vibrating tray with a screen bottom with perforation coefficient equal to 0.3…0.5, and a perforated plate elastically fixed at the bottom by means of springs with perforation coefficient equal to 0.5…0.7, and a vibratory drive has a control unit, by means of which direction, amplitude and frequency of vibration is changed in the required optimum range of operating parameters of the granulating plant: vibration level is in the range of 100…120 dB, frequency of an oscillating process is in the range of 50…100 Hz; each injector consists of a cylindrical part with outer thread for connection to a nozzle of distributing pipeline and two in-series connected hollow cylindrical-conical belts coaxial to it, and coaxial to the housing, in its lower part there fixed is a nozzle formed with outer conical surface and an end blind partition wall perpendicular to the nozzle axis, in which there is a central throttle hole and at least three inclined holes at an angle of 45° to the nozzle axis; on the nozzle conical surface there is a cylindrical collar with outer thread for connection of the nozzle to lower cylindrical-conical belt of the housing; on the nozzle, on the side opposite to liquid supply, there is an additional row of jet nozzles which are formed at least with three pairs of mutually perpendicular vertical channels for liquid passage and horizontal channels which are intersected on a conical side surface of the nozzle and form outlet holes of each jet nozzle; paired channels are located at a right angle to each other in longitudinal planes of the housing; conical side surface of the nozzle has the apex angle equal to 90°, and two rows of throttle holes are made on the cylindrical-conical belt rigidly attached o the cylindrical part of the housing: one row represents at least three horizontal holes made on cylindrical surface; the other row represents at least three inclined holes at an angle of 45°, which are made on conical surface; in horizontal plane the projections of axes of holes in those rows are located at the distance from each other through an angle lying in optimum range of values of 7.5…60°. On the cylindrical-conical belt connected to the nozzle by means of inner thread there is a row consisting of at least three horizontal throttle holes; in horizontal plane the projections of axes of holes and jet nozzles, which are formed at least with three pairs of mutually perpendicular vertical and horizontal channels on conical side surface of the nozzle, are located from each other through an angle lying in optimum range of values: 7.5…60°.

EFFECT: improvement of drying efficiency.

3 dwg

FIELD: heating.

SUBSTANCE: in a device for no-carryover drying, comprising a loading device of moist material or solution, a drying chamber, a fan and a system of spent drying agent treatment, besides, the drying chamber comprises a cylindrical vessel, a porous shell installed coaxially in it, forming a free space for even passage of a drying agent inside the shell, besides, the shell material is made on the basis of aluminium-containing alloys with their further filling by titanium hydride or air with density within 0.5…0.9 kg/m3 with the following strength properties: compression strength within 5…10 MPa, bending strength within 10…20 MPa, and dry product is removed from a hopper via a gate lock, besides, for removal of the drying agent from the shell there is a rotary hollow porous cylinder, connected by means of a shaft with a drive, installed on the cover. Besides, the porous cylinder is made of a stiff porous material, for instance, foam aluminium or metal ceramics, or metal foam rubber with porosity extent within the range of optimal values: 30…45%. Supply of moist material or solution may be carried out by several sprayers, evenly arranged along the entire cross section of the shell, and the drying agent via the space under the upper cover leaves the device, at the outlet of which there is an acoustic plant installed for catching of medium-dispersed particles, connected with a cyclone connected to a discharge device. Optimal parameters for sound treatment in the acoustic plant with concentration of particles in the drying agent flow of at least 2 g/m3 are as follows: level of sound pressure in the range of 145…150 dB, frequency of oscillating process in the range of 900…1100 Hz, time of sounding in the range of 1.0…2 s, according to the invention, the body of each nozzle is made with a channel for supply of solution and comprises a coaxial rigidly coupled bushing, with a nozzle fixed on its lower part, made in the form of a cylindrical double-staged bushing, the upper cylindrical step of which is connected by means of a threaded connection with a central core, comprising a cylindrical part and a coaxial hollow cone installed with a circular gap relative to the inner surface of the cylindrical bushing, and the circular gap is connected at least with three radial channels, made in the double-stage bushing, connecting it with the circular cavity formed by the inner surface of the bushing and the outer surface of the upper cylindrical stage, besides, the circular cavity is connected to the channel of the body for supply of solution, and a sprayer is rigidly connected to the cone in its lower part with the help of a screw, and the sprayer is made in the form of an end round plate, edges of which are bent towards the circular gap between the nozzle and the hollow cone, at the same time on the side surface of the cone there are at least two rows of cylindrical throttling holes, with axes lying in planes perpendicular to the axis of the cone, and in each row there are at least three holes, besides, axes of throttling holes of one row are displaced relative to axes of throttling holes of the other row by an angle in the range of 15°÷60°.

EFFECT: improved efficiency of drying.

2 dwg

FIELD: machine building.

SUBSTANCE: in vortex evaporative-drying chamber with an inert nozzle, which contains evaporative and drying chambers arranged in a common housing and provided with gas supply and discharge pipelines, as well as a filter - heat exchanger made in the form of a nozzle from a fluidised bed of inert media, above which a sprayer is located; the sprayer is made in the form of a header rotating in bearings and provided with a control throttle for supply of initial solution, and exhaust dusted gases are subject to preliminary acoustic treatment in an acoustic plant; after that, gas flow is supplied to a cyclone with a bunker, where the main part of dry material carried over with gases is extracted, and final cleaning of gases is performed in a sleeve filter with a bunker; at that, atomisers are made in the form of acoustic atomisers, a resonator is made in the form of at least one spherical cavity located in an end wall of the housing, which faces a distributing head; at that, the spherical cavity is connected through a calibrated hole to a gap between a vertical hole in the end wall of the housing and a bar of the distributing head. In the cross-section perpendicular to the bar axis the gap has an annular cross-section, and the distributing head is made in the form of a housing with a cover plate in the form of flattened cones connected with large bases; at that, in the housing there located is a header in the form of a cylindrical cavity, which is connected through an annular channel formed with outer cylindrical surface of a hollow bar and holes of similar diameter, which are coaxial to it and made in the cover plate and the distributing head housing with at least three solution outlet channels uniformly arranged in a circumferential direction and perpendicular to the bar axis; at that, the section of the holes is located on conical surface of the distributing head cover plate, an inclination angle of which is determined by a root angle of prayed solution flame. According to the invention, a sprayer atomiser consists of a cylindrical part with outer thread for connection to a nozzle of a distributing pipeline supplying the solution, a conical transient part and a cylindrical part with diametrical section of bigger size and with inner threaded surface, and coaxially to the housing in its lower part there fixed is a nozzle formed with a cylindrical surface with outer thread interacting with the cylindrical part of the housing; at that, cylindrical surface of the nozzle changes over to conical surface and ends with end surface perpendicular to the housing axis, a blind partition wall with a jet nozzle in its centre, which is axisymmetrical to the nozzle and consists of cylindrical and conical throttle holes, which are connected in series. Besides, larger diameter of the conical hole is located on the blind partition wall of the nozzle; at that, the housing and the nozzle form three inner cylindrical chambers coaxial to each other, and on the nozzle, on the side opposite to liquid supply, there is an additional row of jet nozzles, which are formed at least with three pairs of mutually perpendicular vertical channels for liquid passage and horizontal channels which cross on a conical side surface of the nozzle and form outlet holes of each jet nozzle; at that, paired channels are located at a right angle to each other in longitudinal planes of the housing.

EFFECT: improvement of drying efficiency.

2 dwg

FIELD: heating, drying.

SUBSTANCE: invention refers to drying of vegetable materials, particularly to vacuum dryers of intermittent operation, and can be applied for food product drying, particularly for drying of vegetables, mushrooms, fruit, greengrocery, etc. Energy-saving two-stage drying unit for vegetable materials includes cylinder-conic chamber for the first drying stage, sealed feed nipple, drum, insert of cylindrical profile, insert of conical profile, ball valves, cylindrical chamber with tight cover, inlets and outlets, vacuum locks connected to vacuum system serving as the second drying stage.

EFFECT: reduced specific energy consumption, improved efficiency of product drying due to presence of thermal accumulators in the first and second stage space.

1 dwg

FIELD: heating, drying.

SUBSTANCE: invention refers to food, chemical and related industries and can be applied in heat and mass exchange processes, particularly in disperse material drying. Device for disperse material drying in swirling flow of heat carrier with UHF energy supply includes cylindrical-conical drying chamber with opening in the top part of drying chamber for spent heat carrier mix and dried disperse material removal, tangential pipe for tangential heat carrier flow feed, pipe for humid disperse material feed, pipe for axial heat carrier flow feed, swirler installed concentrically along chamber axis in the lower chamber part and featuring product retaining grate in case of the dryer shutdown. Novelty is constituted by installation of humid disperse material feed pipe in a device of spiral form, positioned in the lower part of cylindrical-conical drying chamber, and concentric installation of UHF emitter (magneton) above cylindrical part of cylindrical-conical drying chamber so that maximum density of electromagnetic flux is focused in the swirling annular layer of dried disperse material particles.

EFFECT: improved quality of disperse material dried.

3 dwg

FIELD: heating, drying.

SUBSTANCE: invention refers to disperse material drying technologies and may be used in food, microbiological, chemical and other industries. According to the invention, device for loss-free drying includes body with swirling chamber and nozzle, the body is made in the form of feed nipple with central orifice and coaxial cylindrical shell with external thread, connected rigidly to the nipple, while the bottom body part features coaxial nozzle connected to it by a shell with internal thread and made in the form of centrifugal solution flow swirler in the form of cylindrical insert with at least three tangential cylindrical inlet orifices; the shell forms a part of the nozzle and is installed coaxially to the centrifugal swirler with a cylindrical throttle hole in its end surface; the centrifugal swirler is mounted in cylindrical body chamber, thus forming an annular cylindrical chamber for solution feed to tangential inlets of the centrifugal swirler, and is connected to diffuser outlet chamber; tangential inlets are made in the form of channels in tangential direction towards inner surface of the cylindrical insert, and conical cowling is made at the end surface of centrifugal swirler.

EFFECT: improved dryer design.

3 dwg

Spray drier // 2544109

FIELD: heating, drying.

SUBSTANCE: invention refers to disperse material drying technologies and may be used in food, microbiological, chemical and other industries. Solution diffuser in spray drier includes case with swirling chamber and nozzle, plate diffuser is installed in lower part of conical output chamber of diffuser nozzle and consists of at least two plates perpendicular to the nozzle axis and parallel to each other, the first plate features central hole that catches outer cylindrical surface of the nozzle to attach the diffuser rigidly to the nozzle, while the second plate is solid and is attached to the first plate by at least three fastening elements including screw, nut, and calibrated spacer washer installed between the plates.

EFFECT: improved drier performance.

2 cl, 2 dwg

FIELD: heating, drying.

SUBSTANCE: invention refers to disperse material drying in boiling bed and may be applied in aniline-ink industry, food, pharmaceutical, microbiological, chemical and other industries. spray boiling-bed dryer with passive includes body with gas dispersing grate, vibrating plates, passive nozzle, vibration device; collection system with acoustic unit is positioned in the lower body part; solution sprinkler includes hollow cylindrical body consisting of cylindrical part with outer thread and two hollow cylinder-conical bands connected in series and coaxial to the body, nozzle with cylindrical fillet on its conical surface with external thread for nozzle connection to the lower cylinder-conical band of the body; opposite to solution feed side, there is an additional row of jets formed by at least three pairs of mutually perpendicular vertical channels for solution flow and horizontal channels forming output holes of each jet; conical side surface of the nozzle has 90° top angle; cylinder-conical band features two rows of throttle holes, so that hole axis projections on a horizontal surface in these rows are separated by an angle within optimum 7.5-60° range, and internal surfaces of throttle holes on cylinder-conical bands have helical surfaces.

EFFECT: improved dryer performance.

2 dwg

FIELD: heating, drying.

SUBSTANCE: invention relates to the design of hot gas generators, intended for equipment of the facilities used for drying bulk materials in a fluidized bed. The generator comprises a burner, a heat exchange circuit, means for providing the excess and removing the flow of moist hot gases, and means enabling to provide regulation of flow rate of hot gas (high-pressure fan), at that the heat exchange circuit is made in the form of a first and second hollow rhomboid hexagons, and inside the first hollow rhombic hexagon the flame divider is mounted and it has an input window for the gas burner and the output window for discharging the combustion products, having a hole for inflow of the heated gas, at that the pipe(s) of the heat exchange circuit covers the entire surface of the first hollow rhomboid hexagon, and the second hollow rhomboid hexagon closes the pipe(s) of the heat exchange circuit, at that it has an input window for the gas burner, the output window for discharging the combustion products and the windows for input and output of the heated gas, formed on opposite sides in the direction of movement of the gas along the entire length of the heat exchange circuit. The unit for drying bulk materials in the fluidized bed, in which this hot gas generator is used as a part, has a cabinet of rectangular cross-section containing the section of creation of hot gas and the section of drying bulk materials in the fluidized bed, and in the section of drying bulk materials in the fluidized bed a means is located, which enables to provide regulation of the speed of the flow of hot gas (high-pressure fan) which input is connected to the section of drying bulk products in the fluidized bed, and the output - to the section of hot gas generation, while the section of hot gas generation comprises a heat exchange circuit, an output window for discharging the combustion products, which is connected to the section of drying bulk materials in the fluidized bed, having a window connected to the environment, and the output window for discharging the combustion products has a spark arrester, representing a container of fine metal mesh.

EFFECT: technical result of the invention is to increase the rate of heating gas to the desired temperature.

2 cl, 3 dwg

FIELD: heating.

SUBSTANCE: method of drying progresses at coolant speed in the range from 0.75÷1.1 of the speed of hovering of material particles with largest size and porosity of the layer in the range of 0.75÷0.95. The specified drying method is carried out in a drying plant comprising a hollow drying chamber of permanent cross section, with a gas distributing grid installed in its lower part, and in the upper part entering an unloading device - a separation chamber.

EFFECT: intensification of drying process, elimination of moist material sticking onto gas distributing grid and chamber walls, reduced dimensions by height, reduced thermal grinding of material, increased efficiency of usage of thermal potential of coolant, provision of necessary and sufficient time of material stay in a drier due to effect of retaining capacity of a grid.

2 cl, 1 dwg

FIELD: heating, drying.

SUBSTANCE: multistage system and a method of preliminary drying brown coal using superheated steam is proposed. The system of preliminary drying lignite comprises a dryer with fluidised bed of internal heating, comprising at least one integrated heat exchanger, the first and second discharge valve shutters and the dust-recovery device consisting of at least one stage, as well as a feeder made in the form of a hopper with a screw conveyor connected to the first discharge valve shutter, and the latter is in communication with the dryer with fluidised bed of internal heating. The integrated heat exchanger is in communication with saturated steam and the condensate system; the fluidised bed of the dryer with the fluidised bed of internal heating is in communicated with superheated steam; and the exhaust steam of the dryer with fluidised bed of internal heating is treated by the dust-recovery device, then a part of the exhaust steam is returned to the fluidised bed and the other part of the exhaust steam is removed, and the dust-recovery device is made of two stages and comprises a cyclone dust collector and an electrostatic filter which are connected in series with each other; the cyclone dust collector removes the dust from the part of the exhaust steam and discharges the collected dry powder in the area of the finished product; and the exhaust steam is compressed using a blower in the form of a fan, then a part of the exhaust steam is returned to the dryer with fluidised bed of internal heating and the other part of the exhaust steam is removed after removing the dust from the exhaust steam using the cyclone dust collector, and supply of superheated steam is provided into the fluidised bed of the dryer with the fluidised bed of internal heating; supply of saturated steam into the integrated heat exchanger of the dryer with fluidised bed of internal heating as a source of drying; lignite unloading and feeding it into the area of finished products after drying lignite to the desired degree of moisture, which is regulated by the duration of keeping the lignite in a fluidised bed; capture of water released by lignite during drying and a part of materials from the fluidised bed with the exhaust superheated steam in the fluidised bed; dust removal by the cyclone dust collector; transfer of the collected dry powder in the area of finished products; compression of the part of the exhaust superheated steam and feeding it by the blower into the fluidised bed as the fluidising medium of the fluidised bed; removal of dust and removal of the other part of the exhaust superheated steam by means of an electrostatic filter; and returning of the water condensate collected in the integrated heat exchanger of the dryer with fluidised bed of internal heating, back to the boiler for reuse. The method of drying for the system of preliminary drying lignite with superheated steam is that the superheated steam as the fluidising medium is in direct contact with lignite, thereby ensuring the removal of water steam, comprising: supplying the wet lignite containing 30%-50% water, to the dryer with fluidised bed of internal heating; supplying superheated steam in the fluidised bed of the dryer with fluidised bed of internal heating; supplying the saturated steam to the integrated heat exchanger of the dryer with fluidised bed of internal heating as a source of drying; lignite unloading and feeding it into the area of finished products after drying lignite to the desired degree of moisture, which is regulated by the duration of keeping the lignite in the fluidised bed; capture of water released by lignite during drying and part of materials from the fluidised bed by the used exhaust superheated steam in the fluidised bed; dust removal by the cyclone dust collector; transfer of the collected dry powder in the area of finished products; compression of part of the exhaust superheated steam and feeding it by the blower fan into the fluidised bed as the fluidising medium of the fluidised bed; removal of dust and removal of other part of the exhaust superheated steam by means of the electrostatic filter; and return of the water condensate collected in the integrated heat exchanger of the dryer with fluidised bed of internal heating, back to the boiler for reuse. The system of preliminary drying of lignite by superheated steam comprises a multistage drying unit, each stage of which comprises a feeder, a discharge device and the dust-recovery device comprising at least of one stage; is characterised in that the part of the exhaust gas is fed from the output of the dust-recovery device to the corresponding drying device using the blowing device; another part of the exhaust gas is fed to the drying device of the next stage as a heat source; the drying device of the first stage is connected to a source of heating steam; the dust-recovery device of the drying device of the final stage feeds a part of the exhaust gas to the corresponding drying device using the blower; and the other part of the exhaust gas is discharged. The method of drying for the system of preliminary drying lignite with superheated steam, according to which the superheated steam as the medium directly contacts the lignite thereby ensuring removal of water steam and generating heat, multiple stages of dryers with fluidised bed of internal heating are sequentially connected, the dust from the exhaust steam, formed in the first stage, is removed, and the exhaust steam fulfils the function of the heating medium for the second stage, the dust from the exhaust steam formed in the second stage, is removed, and the exhaust steam fulfils the function of the heating medium for the third stage, and so on, and which comprises on the first stage drying in the first stage, namely supply of wet lignite containing 30%-50% water, to the fluidised bed of the dryer with fluidised bed of internal heating of the first stage; supplying superheated steam to the fluidised bed of the dryer with fluidised bed of internal heating of the first stage; feeding the saturated steam to the integrated heat exchanger of the dryer with fluidised bed of internal heating of the first stage as a source of drying; unloading the lignite and feeding it into the area of finished products after drying lignite to the desired degree of moisture, which is regulated by the duration of keeping of lignite in the fluidised bed; capture of water released by lignite during drying and the part of materials from the fluidised bed by the exhaust superheated steam in the fluidised bed; dust removal by the cyclone dust collector; transfer of the collected dry powder to the area of finished products; compression of part of the exhaust superheated steam and feeding it by the blower fan into the fluidised bed as the drying medium of the fluidised bed; dust removal from another part of the exhaust superheated steam using the electrostatic filter, while another part of the exhaust superheated steam is used as a coolant of the integrated heat exchanger of the dryer with fluidised bed of internal heating of the second stage; and return of the water condensate collected in the integrated heat exchanger of the dryer with fluidised bed of internal heating of the first stage, back to the boiler for reuse; at the second stage the drying in the second stage is carried out by feeding the wet lignite containing 30%-50% water to the fluidised bed of the dryer with fluidised bed of internal heating of the second stage; feeding exhaust superheated steam treated with electrostatic filter of the first stage to the integrated heat exchanger of the dryer with fluidised bed of internal heating of the second stage; unloading the lignite and its supply into the area of the finished product after drying the lignite to the desired degree of moisture, which is controlled by duration of keeping lignite in the fluidised bed; capture of water released by lignite during drying, and part of the substances from the fluidised bed by the exhaust superheated steam in the fluidised bed; dust removal using the cyclone dust collector of the second stage; compression of the part of the exhaust superheated steam and feeding it by the blower fan of the second stage to the electrostatic filter of the second stage for dust removal, feeding another part of the exhaust superheated steam, which is used as the drying medium to the dryer with fluidised bed of internal heating of the second stage, while the other part of the exhaust superheated steam treated in the electrostatic filter of the second stage is used as the coolant of the integrated heat exchanger of the dryer with fluidised bed of internal heating of the third stage; and supplying the said another part of exhaust superheated steam to participate in the drying process at the third stage; at the third stage the remaining drying processes are similar to the second stage, a part of the exhaust gas after treatment in the electrostatic filter of the final stage is returned to the corresponding boiler for reuse, the other part of the exhaust gas is removed.

EFFECT: invention provides creation of a system of preliminary drying lignite with superheated steam and development the method of drying lignite, which combines the use of the fluidised bed of internal heating and superheated steam, which enables to dry the wet lignite containing 30-50% water, and obtain at the output the lignite containing 12% water.

6 cl, 4 dwg

Water-jet heater // 2525562

FIELD: heating.

SUBSTANCE: water-jet heater is designed as a vertical sectional pneumatic pipe. In its lower section connected to the device for feeding material the exhaust coolant is fed. The middle section of the pneumatic pipe is provided with holes or nozzles placed in the conchiform manifold, in which with fresh coolant is fed. The upper section of the pneumatic pipe is connected to the discharge device where the exhaust coolant is released from the solid phase.

EFFECT: increase in efficiency of use of the coolant and thereby reduction of fuel consumption, uniformity of distribution of coolant over the cross section of the pneumatic pipe and intensification of heat and mass exchange.

4 cl, 1 dwg

FIELD: machine building.

SUBSTANCE: vibrated fluidised bed dryer for disperse materials is fixed on a foundation and comprises a housing with gas supplying and gas removing ducts, devices for loading and unloading of the material being dried, a vibratory drive with side members set on it and pivotally coupled with bars. According to the invention, the dryer's vibratory drive is made as a crank mechanism with its side members being pivotally coupled to the vibratory drive bars by one end and to the pivotal supports rigidly fixed on the dryer foundation by the other end, with the possibility of inclination in the direction from the loading device to the unloading device at the angle α between the lower position of side member swinging and the horizontal plane. The angle α value is within the range of 0-15°.

EFFECT: faster drying process due to the increased heat transfer from gas heat carrier to the dried material.

2 dwg

FIELD: food and chemical industries.

SUBSTANCE: invention can be used in dispersed material driers with active hydrodynamic layer (with fluidization). Proposed drier contains drying chamber with grid bottom and drying agent inlet branch pipe. Drying chamber accommodates striker with reciprocating drive passing through layer of material to be dried at starting of drier. In period of starting, when velocity of drying agent is below critical compact layer of particles of material to be dried is broken in one place by shocks of striker applied during 1-3 s at 0.5-6 Hz and penetrating through layer. Integrity of layer is thus destructed, and dispersed product changes into fluidized state. Reduction of fluidization velocity and pressure differential on drying chamber bottom improved efficiency without loss of quality.

EFFECT: provision of drier of simple design.

1 dwg

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