CN111457677A - Online drying and mixing system and method for superfine powder - Google Patents
Online drying and mixing system and method for superfine powder Download PDFInfo
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- CN111457677A CN111457677A CN202010422533.4A CN202010422533A CN111457677A CN 111457677 A CN111457677 A CN 111457677A CN 202010422533 A CN202010422533 A CN 202010422533A CN 111457677 A CN111457677 A CN 111457677A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
- F26B3/10—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour carrying the materials or objects to be dried with it
- F26B3/12—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour carrying the materials or objects to be dried with it in the form of a spray, i.e. sprayed or dispersed emulsions or suspensions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
- F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/001—Handling, e.g. loading or unloading arrangements
- F26B25/002—Handling, e.g. loading or unloading arrangements for bulk goods
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/005—Treatment of dryer exhaust gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/04—Agitating, stirring, or scraping devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention belongs to the field of material preparation, and relates to an online drying and mixing system and method for superfine powder. The online drying and mixing system for the superfine powder comprises an atomization drying device, a mixing drying device, a powder secondary collecting device, a liquid feeding device and an air inlet device. According to the system, different powder atomization drying time differences are utilized, and powder particles dried firstly are adsorbed and wrapped by powder atomization liquid dried slowly, so that different powder bodies are preliminarily mixed in an atomization drying stage and uniformly mixed before secondary drying of the powder bodies, the purpose of drying and mixing the powder bodies on line is achieved, the field, equipment investment and energy consumption are saved, and the production efficiency is improved; through set up annular jet-propelled pipeline in the middle part in the desicator, can upwards spout dry hot air current with certain angle, form the turbulent flow in atomizer below region, can be with the atomizing liquid drop drying in the desicator, roll powder granule, stir, make different powder further mix.
Description
Technical Field
The invention belongs to the field of material preparation, and particularly relates to an online drying and mixing system and method for superfine powder.
Background
In practical production, multiple superfine powder materials with different components are often required to be mixed and processed into a final product according to a proportion for use, different powder materials have different characteristics and different preparation processes, and the uniformity of powder mixing can directly influence the performance of the final product. The superfine powder is easy to agglomerate in the production and application processes due to small particle size, different superfine powders are difficult to be uniformly mixed by a common stirring process, when a superfine powder mixed material is prepared, the superfine powder is often prepared and dried and collected by different wet processes, and then the powder is mixed and processed into the mixed material according to a proportion.
Disclosure of Invention
Compared with the prior art, the online drying and mixing system for the ultrafine powder is compact and integrated, simplifies the production process, saves the field and device investment, saves the energy consumption, improves the production efficiency, and is particularly suitable for online drying and mixing of the ultrafine powder of different liquid phase preparation processes.
The invention provides an online drying and mixing system for superfine powder, which comprises an atomization drying device, a mixing drying device, a powder secondary collecting device, a liquid feeding device and an air inlet device, wherein the atomization drying device is connected with the mixing drying device;
the atomization drying device comprises a dryer, wherein an atomizer I is installed at the top end in the dryer, an atomizer II and an annular air injection pipeline are installed on the inner side wall of the dryer, the atomizer II is located below the atomizer I, nozzle openings of the atomizer I and the atomizer II are opposite and keep a certain distance, and the annular air injection pipeline is located below the atomizer II and keeps a certain distance;
the mixing and drying device comprises a mixer, a secondary dryer and a storage tank I, wherein the mixer is positioned below the dryer, a feed inlet of the mixer is communicated with a discharge outlet at the bottom of the dryer, a discharge outlet of the mixer is communicated with a powder inlet of the secondary dryer, and a powder outlet of the secondary dryer is communicated with the storage tank I;
the powder secondary collection device comprises a cyclone separator and a storage tank II, a feed inlet of the cyclone separator is communicated with a gas outlet of the secondary dryer, the bottom of the cyclone separator is communicated with the storage tank II, and the top of the cyclone separator is communicated with the tail gas treatment system;
the liquid conveying device comprises a liquid storage tank I and a liquid storage tank II; the liquid storage tank I is communicated with a liquid inlet of the atomizer I through a delivery pump I and a pipeline; the liquid storage tank II is communicated with a liquid inlet of the atomizer II through a delivery pump II and a pipeline;
the air inlet device comprises an air feeder, a heat exchanger I and a heat exchanger II; the air outlet of the air feeder is respectively communicated with the air inlets of the heat exchanger I and the heat exchanger II, one path of the air outlet of the heat exchanger I is communicated with the air inlet of the atomizer I, and the other path of the air outlet of the heat exchanger I is communicated with the air inlet of the atomizer II after being converged with the air outlet of the air feeder; and one path of an air outlet of the heat exchanger II is communicated with an air inlet of the annular air injection pipeline, and the other path of the air outlet of the heat exchanger II is communicated with an air inlet of the secondary dryer.
Further, the upper half of dryer is the cylinder, and the lower half is the cone, atomizer I is installed on the inboard top of cylinder part, atomizer II is installed on the inside wall on cylinder upper portion, annular jet-propelled pipeline installs on the inside wall of cylinder lower part.
Further, the atomizer II comprises a fixed end and a spray rod extending to the central position in the dryer, the fixed end is arranged on the side wall of the dryer, and a liquid inlet, an air inlet and an annular spray hole are formed in the fixed end; the mixed liquid from the liquid storage tank II enters the spray rod through the liquid inlet and is sprayed out through a nozzle at the end part of the spray rod; the gas from the blower and the heat exchanger I enters through the gas inlet and is sprayed out through the annular spray holes and the nozzles, and the powder particles falling on the spray rod can be blown away by the gas flow sprayed out through the annular spray holes.
Furthermore, the annular air injection pipeline is tightly installed on the inner wall of the dryer and comprises an annular air inlet hole and a nozzle, the annular air inlet hole is communicated with an air outlet of the heat exchanger II through a pipeline, the nozzle is rotationally fixed on the annular air injection pipeline, the fixed part of the nozzle is spherical, and the air injection angle can be adjusted up and down.
Further, mix the machine and include motor, air feed dish and blender, motor, air feed dish and blender are installed in same pivot, the motor is used for driving the rotation of air feed dish, the left side at the machine feed inlet is installed to motor and air feed dish, the right side at the machine feed inlet is installed to the blender, and the discharge gate of blender and the powder entry intercommunication of second grade desicator.
Further, the motor is a variable frequency motor.
Furthermore, the air supply surface of the air supply disc is two integrated gradual-change blades.
Further, the blender is excellent round pin formula blender, installs the multirow stick round pin on the blender, and every row of stick round pin comprises many round bars, and the round bar on two adjacent rows of stick round pins is crisscross to be installed, and every round bar installation angle of back row of stick round pin just is located in the middle of two round bars of one row of stick round pin before.
Furthermore, the injection pressure and the liquid inlet amount of the atomizer I and the atomizer II can be adjusted.
Furthermore, electric stirrers are installed on the liquid storage tank I and the liquid storage tank II.
Further, the conveying pump I and the conveying pump II are respectively and independently a peristaltic pump or a screw pump.
Furthermore, the cyclone separator is an air hopper lengthened separator.
In addition, the invention also provides a method for online mixing and drying the ultrafine powder by adopting the online drying and mixing system for the ultrafine powder.
The invention has the following beneficial effects:
(1) utilize different powder atomization drying time difference, the powder granule of leading drying is adsorbed, is wrapped up by the powder atomized liquid of slower drying to make different powders realize preliminary mixing promptly in the atomization drying stage, carry out the homogeneous mixing before the powder secondary is dry, reach the purpose that the online drying of powder mixes, save place, equipment input and energy consumption, improve production efficiency.
(2) Through set up annular jet-propelled pipeline in the middle part in the desicator, can upwards spout dry hot air current with certain angle, form the turbulent flow in atomizer below region, can be with the atomizing liquid drop drying in the desicator, roll powder granule, stir, make different powder further mix.
(3) And an annular spray hole is designed at the fixed end of the spray rod of the atomizer II, and powder particles falling on the spray rod can be blown away by air flow sprayed from the annular spray hole, so that the powder is prevented from being accumulated on the spray rod.
Drawings
Fig. 1 is a schematic structural diagram of an online drying and mixing system for ultrafine powder provided by the present invention.
FIG. 2 is a schematic diagram of the internal structure of the atomizer II.
Fig. 3 is a sectional structure diagram of the annular air injection pipeline.
FIG. 4 is a schematic sectional view of the mixer.
FIG. 5 is a schematic view of the internal blower disk structure of the mixer.
Description of the reference numerals
1-a dryer; 2-atomizer I; 3-atomizer II; 4-an annular gas injection pipeline; 5-a mixer; 6-a secondary dryer; 7-a cyclone separator; 8A-a material storage tank I; 8B-a material storage tank II; 9-a liquid storage tank I; 10-liquid storage tank II; 11-a blower; 12-heat exchanger i; 13-Heat exchanger II; 14. 15, 16, 17A, 17B, 18A, 18B-pipes; 19A, 19B-solenoid valve and flow controller; 19C, 19D, 19E, 19F-electromagnetic valve and flow regulator; 20-a motor; 21-an air supply disc; 22-a mixer; 23-liquid inlet; 24-an air inlet; 25-annular jet holes; 26-a spray rod; 27-an annular air intake; 28-a nozzle; 29-inner wall; 30A-delivery pump I; 30B-transfer pump II.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the system or apparatus being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the present invention, it is to be understood that the terms "I" and "II" are introduced for convenience of description to distinguish the same element from different positions.
As shown in fig. 1, the online drying and mixing system for ultrafine powder provided by the present invention comprises an atomizing and drying device, a mixing and drying device, a powder secondary collecting device, a liquid feeding device and an air inlet device; the atomization drying device comprises a dryer 1, wherein an atomizer I2 is installed at the top end in the dryer 1, an atomizer II 3 and an annular air injection pipeline 4 are installed on the inner side wall of the dryer, the atomizer II 3 is located below the atomizer I2, nozzle openings of the atomizer I2 and the atomizer II 3 are opposite and keep a certain distance, and the annular air injection pipeline 4 is located below the atomizer II 3 and keeps a certain distance; the mixing and drying device comprises a mixer 5, a secondary dryer 6 and a storage tank I8A, wherein the mixer 5 is positioned below the dryer 1, a feed inlet of the mixer 5 is communicated with a discharge outlet at the bottom of the dryer 1, a discharge outlet of the mixer is communicated with a powder inlet of the secondary dryer 6, and a powder outlet of the secondary dryer 6 is communicated with the storage tank I8A; the powder secondary collection device comprises a cyclone separator 7 and a storage tank II 8B, a feed inlet of the cyclone separator 7 is communicated with a gas outlet of the secondary dryer 6, the bottom of the cyclone separator 7 is communicated with the storage tank II 8B, and the top of the cyclone separator 7 is communicated with a tail gas treatment system; the liquid conveying device comprises a liquid storage tank I9 and a liquid storage tank II 10; the liquid storage tank I9 is communicated with a liquid inlet of the atomizer I2 through a delivery pump I30A and a pipeline 14; the liquid storage tank II 10 is communicated with a liquid inlet of the atomizer II 3 through a delivery pump II 30B and a pipeline 15; the air inlet device comprises a blower 11, a heat exchanger I12 and a heat exchanger II 13; the air outlet of the blower 11 is respectively communicated with the air inlets of the heat exchanger I12 and the heat exchanger II 13, one path of the air outlet of the heat exchanger I12 is communicated with the air inlet of the atomizer I2 through a pipeline 16, and the other path of the air outlet of the heat exchanger I12 is converged with an air outlet pipeline 17A of the blower 11 and then communicated with the air inlet of the atomizer II 3 through a pipeline 17B; one path of the air outlet of the heat exchanger II 13 is communicated with the air inlet of the annular air injection pipeline 4 through a pipeline 18A, and the other path of the air outlet is communicated with the air inlet of the secondary dryer 6 through a pipeline 18B. Electric stirrers are preferably arranged on the liquid storage tank I9 and the liquid storage tank II 10.
According to a preferred embodiment of the present invention, as shown in fig. 1, the dryer 1 has a cylindrical upper part and a conical lower part, the atomizer i 2 is mounted on the top of the inner side of the cylindrical part, the atomizer ii 3 is mounted on the inner side wall of the upper part of the cylindrical part, and the annular gas injection pipeline 4 is mounted on the inner side wall of the lower part of the cylindrical part. The nozzles of the atomizer I2 and the atomizer II 3 are preferably arranged at the central position in the dryer. The nozzle openings of the atomizer I2 and the atomizer II 3 are opposite, and the distance between the two can be 10-100 cm. The annular air injection pipeline 4 is located below the atomizer II 3, and the distance between the annular air injection pipeline and the atomizer II 3 can be 30-150 cm. The atomizer I2 firstly sprays the powder mixed solution a, the powder mixed solution is contacted with hot air with higher temperature and is dried instantly, the atomizer II 3 sprays the powder mixed solution b, because the gas temperature entering the atomizer II 3 is lower than the gas temperature entering the atomizer I2, the drying time of the atomized liquid drops ejected by the atomizer II 3 is longer than the drying time of the atomized liquid drops ejected by the atomizer I2, the powder particles dried first are adsorbed and wrapped by the powder atomized liquid dried slowly by utilizing the time difference of different powder atomized drying, the preliminary mixing is realized, the preliminary mixed particles fall to the position of the annular gas injection pipeline 4, and the annular gas injection pipeline 4 can eject dry hot air flow upwards at a certain angle, turbulent flow is formed in the area below the atomizer, atomized liquid drops in the dryer can be dried, and meanwhile, powder particles are rolled and stirred, so that different powders are further mixed.
The injection pressure and the liquid inlet amount of the atomizer I2 and the atomizer II 3 can be adjusted. The method can be specifically realized by the following steps: the pipeline 14 is provided with an electromagnetic valve and a flow controller 19A, and the pipeline 15 is provided with an electromagnetic valve and a flow controller 19B for adjusting the liquid inlet flow rate of the mixed liquid; the pipeline 16 is provided with an electromagnetic valve and a regulator 19C, the pipeline 17B is provided with an electromagnetic valve and a regulator 19D, the pipeline 18A is provided with an electromagnetic valve and a regulator 19E, and the pipeline 18B is provided with an electromagnetic valve and a regulator 19F for regulating the gas inlet flow rate.
According to a preferred embodiment of the present invention, as shown in fig. 2, the atomizer ii 3 comprises a fixed end and a spray rod 26 extending to a central position in the dryer 1, the fixed end is disposed on a side wall of the dryer 1, and the fixed end is provided with a liquid inlet 23, a gas inlet 24 and an annular spray hole 25; the mixed liquid from the liquid storage tank II 10 enters the spray rod 26 through the liquid inlet 23 and is sprayed out through a nozzle at the end part of the spray rod 26; the gas from the blower 11 and the heat exchanger I12 enters through the gas inlet 24 and is sprayed out through the annular spray hole 25 and the nozzle, and the powder particles falling onto the spray rod 26 can be blown away by the gas flow sprayed out through the annular spray hole 25. In addition, the structure of the atomizer I2 can be the same as that of the atomizer II 3, but the atomizer I2 is positioned at the top of the dryer 1, so that a spray rod and an annular spray hole do not need to be arranged, only a liquid inlet, a gas inlet and a nozzle are needed, mixed liquid from the liquid storage tank I9 and gas from the heat exchanger I12 are sprayed out of the nozzle through the liquid inlet and the gas inlet respectively, and the mixed liquid is contacted with hot air flow with high temperature to be dried instantly.
According to a preferred embodiment of the present invention, as shown in fig. 3, the annular air injection duct 4 is tightly installed on the inner wall 29 of the dryer 1, the annular air injection duct 4 comprises an annular air inlet 27 and a nozzle 28, the annular air inlet 27 is communicated with the air outlet of the heat exchanger ii 13 through a duct 18A, and the nozzle 28 is rotatably fixed on the annular air injection duct 4 and is spherical in fixed position, so that the air injection angle can be adjusted up and down. After high-temperature gas from the heat exchanger II 13 enters the annular air inlet 27 through the pipeline 18A, dry hot air flow is upwards sprayed out at a certain angle through the nozzle 28 to form turbulent flow, atomized liquid drops in the dryer can be dried, and powder particles can be rolled and stirred to further mix different powders. In addition, the air injection angle of the nozzle 28 is preferably 15-75 degrees.
According to a preferred embodiment of the present invention, as shown in fig. 1, the mixer 5 includes a motor 20, an air feeding disk 21 and a mixer 22, the motor 20, the air feeding disk 21 and the mixer 22 are installed on the same rotating shaft, the motor 20 is used for driving the air feeding disk 21 to rotate, the motor 20 and the air feeding disk 21 are installed on the left side of the feeding port of the mixer 5, the mixer 22 is installed on the right side of the feeding port of the mixer 5, and the discharging port of the mixer 22 is communicated with the powder inlet of the secondary dryer 6. The powder from the dryer 1 is sucked into the mixer 5 through the bottom of the dryer 1, is pushed to the mixer 22 by the air supply disk 21, is uniformly mixed by the high-speed stirring of the mixer 22, then enters the interior of the secondary dryer 6, and is further dried by the hot air flow from the heat exchanger II 13. In addition, the mixer 5 further includes a metal shell covering the motor 20, the blowing tray 21 and the mixer 22, and a base for fixing the motor 20, the blowing tray 21 and the mixer 22. The motor 20 may be a variable frequency motor. As shown in fig. 4, the air blowing surface of the air blowing plate 21 is preferably two integral tapered blades. As shown in fig. 5, the mixer 22 is preferably a pin type mixer, and multiple rows of pins are mounted on the mixer, each row of pins is composed of multiple round bars, the round bars on two adjacent rows of pins are mounted in a staggered manner, and the mounting angle of each round bar on the next row of pins is just located between two round bars on the previous row of pins, which is more beneficial to mixing different powders, so as to obtain better mixing effect.
Second grade desicator 6 is the infundibulate container, and 6 left sides of second grade desicator are linked together with blender 5, and hot-blast air inlet unit is installed at the top and is connected with pipeline 18B in order to input dry hot gas, and the lower extreme right side is connected with cyclone 7, and the lower extreme is that the discharge gate is linked together with storage tank I8A. And the powder from the mixer 5 is secondarily dried in a secondary dryer 6, the secondarily dried powder is discharged into a storage tank I8A through the lower end of the secondary dryer 6, and the residual powder enters a cyclone separator 7 along with the airflow for secondary collection.
The liquid delivery device is provided with two sets of liquid storage tanks and delivery pumps. Electric stirrers are preferably arranged on the liquid storage tank I9 and the liquid storage tank II 10, so that the mixed liquid can be prevented from precipitating, and powder can be dispersed in the solution to obtain uniform mixed atomized liquid. The conveying pump I30A and the conveying pump II 30B can be respectively and independently a peristaltic pump or a screw pump.
The air inlet device is provided with two sets of heat exchangers, the heat exchangers I12 and II 13 can independently adjust heating temperature, hot gas output from the heat exchanger I12 enters the atomizer I12 through a pipeline 16, the hot gas output from the heat exchanger I12 is mixed with room temperature gas input by a pipeline 17A to be adjusted into airflow with slightly lower temperature to enter the atomizer II 3, the hot gas output from the heat exchanger II 13 enters the dryer 1 through a pipeline 18A and an annular gas injection pipeline 4 and enters the secondary dryer 6 through a pipeline 18B, and drying temperature in different sections in the dryer 1 can be adjusted through the two sets of independent heat exchangers.
When the device works, a liquid storage tank I9 is filled with ultrafine powder mixed liquid a and starts an electric stirrer to stir at a constant speed, a liquid storage tank II 10 is filled with ultrafine powder mixed liquid B and starts the electric stirrer to stir at a constant speed, a mixer 5 is started, a blower 11 is started to supply air to a heat exchanger I12, a heat exchanger II 13 and a pipeline 17A, hot air output from the heat exchanger I12 enters an atomizer I2 through a pipeline 16 after the flow rate and pressure of the hot air are adjusted by an adjuster 19C, the hot air is mixed with normal-temperature gas conveyed by the pipeline 17A after the flow rate and pressure of the hot air are adjusted by an adjuster 19D to form gas with lower temperature, the gas flows enters an atomizer II 3 through a pipeline 17B, hot air output from the heat exchanger II 13 enters an annular gas injection pipeline 4 after the flow rate and pressure of the hot air are adjusted. After the interiors of the dryer 1 and the secondary dryer 6 reach set temperatures, the conveying pump I30A and the conveying pump II 30B are started successively according to set time differences, powder mixed liquid a and powder mixed liquid B are conveyed to the atomizer I2 and the atomizer II 3 respectively, the atomizer I2 firstly sprays the powder mixed liquid a and is instantly dried by contacting with hot air with higher temperature, the atomizer II 3 sprays the powder mixed liquid B, the temperature of gas entering the atomizer II 3 from a pipeline 17B is lower than that of gas entering the dryer 2 from a pipeline 16, so that the drying time of mist liquid drops sprayed by the atomizer II 3 is longer than that of mist liquid drops sprayed by the atomizer I2, and the mist liquid drops sprayed by the atomizer II 3 spray liquid B when the mist liquid drops sprayed by the atomizer I2 are dried into powder particles a and fall above the atomizer II 3 by adjusting the flow rates and the drying interval temperatures of the two kinds of powder mixed liquid, a, the powder particles are wrapped and adsorbed by the atomized liquid drops to achieve the primary mixing effect, and in the falling process of the atomized liquid drops, contacts with hot air flow jetted by an annular air jet pipeline 4 at the middle part in the dryer 1, is rapidly dried into powder particles, the dried powder particles are wrapped by turbulent air flow, rolled, stirred and further mixed, then sucked into the mixer 5 through the lower end of the dryer, and pushed to the mixer 22 by the blast plate 21, under the high-speed stirring of blender 22, the powder granule is by the misce bene, get into inside secondary dryer 6, the powder of misce bene is further dried by the hot gas flow from pipeline 18B input, and the mixed powder after the secondary drying mostly gets into storage tank I8A, and remaining powder gets into cyclone 7 along with the air current and carries out the secondary and collect, and the powder that the secondary was collected gets into storage tank II 8B, and tail gas is delivered to tail gas processing system through the top pipeline.
In addition, the invention also provides a method for online mixing and drying the ultrafine powder by adopting the online drying and mixing system for the ultrafine powder. Specifically, after being uniformly stirred by a liquid storage tank I9 and a liquid storage tank II 10, a superfine powder mixed solution and a superfine powder mixed solution B are sequentially started by a conveying pump I30A and a conveying pump II 30B according to a set time difference, the powder mixed solution a and the powder mixed solution B are respectively conveyed to an atomizer I2 and an atomizer II 3, the powder mixed solution a is firstly sprayed by the atomizer I2, is contacted with hot air with higher temperature and is instantly dried into powder particles a, the powder mixed solution B is sprayed by the atomizer II 3 and is contacted with hot air with lower temperature, the hot air is sprayed by an annular air spraying pipeline 4, the mixed powder particles dried by the dryer 1 are mixed by a mixer 5 and then enter a secondary dryer 6, are secondarily dried by the hot air from a heat exchanger II 13, most of the secondarily dried mixed powder is deposited and enters a storage tank I A, and residual powder enters a cyclone separator 7 along with the air flow for secondary collection, and the powder collected secondarily enters a storage tank II 8B, and tail gas is delivered to a tail gas treatment system through a top pipeline.
The starting time difference between the conveying pump I30A and the conveying pump II 30B is preferably 0.5-5 s.
The flow rate of the powder mixed liquid a to the atomizer I2 is preferably 50-500 m L/min, the flow rate of the powder mixed liquid b to the atomizer II 3 is preferably 50-500 m L/min, and the particle diameters of the powder a and the powder b are preferably 0.1-50 μm respectively and independently.
The temperature of hot air introduced into the atomizer I2 is preferably 100-300 ℃, the flow rate is preferably 10-1000L/min, the temperature of hot air introduced into the atomizer II 3 is preferably 60-250 ℃, the flow rate is preferably 10-1000L/min, the temperature of hot air introduced into the annular air injection pipeline 4 is preferably 100-300 ℃, the flow rate is preferably 100-5000L/min, the temperature of hot air introduced into the secondary dryer 6 is preferably 100-300 ℃, and the flow rate is preferably 100-5000L/min.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. An online drying and mixing system for superfine powder is characterized by comprising an atomization drying device, a mixing and drying device, a powder secondary collecting device, a liquid feeding device and an air inlet device;
the atomization drying device comprises a dryer (1), wherein an atomizer I (2) is installed at the top end in the dryer (1), an atomizer II (3) and an annular air injection pipeline (4) are installed on the inner side wall of the dryer (1), the atomizer II (3) is located below the atomizer I (2), nozzle openings of the atomizer I (2) and the atomizer II (3) are opposite and keep a certain distance, and the annular air injection pipeline (4) is located below the atomizer II (3) and keeps a certain distance;
the mixing and drying device comprises a mixer (5), a secondary dryer (6) and a storage tank I (8A), wherein the mixer (5) is positioned below the dryer (1), a feed inlet of the mixer (5) is communicated with a discharge outlet at the bottom of the dryer (1), a discharge outlet of the mixer is communicated with a powder inlet of the secondary dryer (6), and a powder outlet of the secondary dryer (6) is communicated with the storage tank I (8A);
the powder secondary collection device comprises a cyclone separator (7) and a storage tank II (8B), a feed inlet of the cyclone separator (7) is communicated with a gas outlet of the secondary dryer (6), the bottom of the cyclone separator (7) is communicated with the storage tank II (8B), and the top of the cyclone separator is communicated with a tail gas treatment system;
the liquid conveying device comprises a liquid storage tank I (9) and a liquid storage tank II (10); the liquid storage tank I (9) is communicated with a liquid inlet of the atomizer I (2) through a delivery pump I (30A) and a pipeline (14); the liquid storage tank II (10) is communicated with a liquid inlet of the atomizer II (3) through a delivery pump II (30B) and a pipeline (15);
the air inlet device comprises a blower (11), a heat exchanger I (12) and a heat exchanger II (13); the air outlet of the air feeder (11) is respectively communicated with the air inlets of the heat exchanger I (12) and the heat exchanger II (13), one path of the air outlet of the heat exchanger I (12) is communicated with the air inlet of the atomizer I (2), and the other path of the air outlet of the heat exchanger I is communicated with the air inlet of the atomizer II (3) after being converged with the air outlet of the air feeder (11); one path of an air outlet of the heat exchanger II (13) is communicated with an air inlet of the annular air injection pipeline (4), and the other path of the air outlet of the heat exchanger II is communicated with an air inlet of the secondary dryer (6).
2. The online drying and mixing system for ultrafine powder according to claim 1, wherein the upper half of the dryer (1) is a cylinder and the lower half is a cone, the atomizer I (2) is installed on the top end of the inner side of the cylinder, the atomizer II (3) is installed on the inner side wall of the upper portion of the cylinder, and the annular air injection pipeline (4) is installed on the inner side wall of the lower portion of the cylinder.
3. The online drying and mixing system for the ultrafine powder according to claim 1, wherein the atomizer II (3) comprises a fixed end and a spray rod (26) extending to the central position in the dryer (1), the fixed end is arranged on the side wall of the dryer (1), and a liquid inlet (23), a gas inlet (24) and an annular spray hole (25) are arranged on the fixed end; the mixed liquid from the liquid storage tank II (10) enters the spray rod (26) through the liquid inlet (23) and is sprayed out through a nozzle positioned at the end part of the spray rod (26); gas from the blower (11) and the heat exchanger I (12) enters through the gas inlet (24) and is sprayed out through the annular spray holes (25) and the nozzles, and powder particles falling onto the spray rod (26) can be blown away by the gas flow sprayed out through the annular spray holes (25).
4. The online drying and mixing system for the ultrafine powder according to claim 1, wherein the annular air injection pipeline (4) is tightly installed on the inner wall (29) of the dryer (1), the annular air injection pipeline (4) comprises an annular air inlet hole (27) and a nozzle (28), the annular air inlet hole (27) is communicated with an air outlet of the heat exchanger II (13) through a pipeline (18A), and the nozzle (28) is rotationally fixed on the annular air injection pipeline (4) and is spherical at a fixed part, so that an air injection angle can be adjusted up and down.
5. The online drying and mixing system for the ultrafine powder according to any one of claims 1 to 4, wherein the mixer (5) comprises a motor (20), an air blowing disc (21) and a mixer (22), the motor (20), the air blowing disc (21) and the mixer (22) are mounted on the same rotating shaft, the motor (20) is used for driving the air blowing disc (21) to rotate, the motor (20) and the air blowing disc (21) are mounted on the left side of a feed port of the mixer (5), the mixer (22) is mounted on the right side of the feed port of the mixer (5), and a discharge port of the mixer (22) is communicated with a powder inlet of the secondary dryer (6); the motor (20) is a variable frequency motor; the air supply surface of the air supply disc (21) is provided with two integrated gradual-change blades; mixer (22) are excellent round pin formula blender, install multirow stick round pin on the blender, and every row of stick round pin comprises many round bars, and the round bar on two adjacent rows of stick round pins is crisscross to be installed, and every round bar installation angle of back row of stick round pin just is located in the middle of two round bars of one row of stick round pin before.
6. The online drying and mixing system for the ultrafine powder according to any one of claims 1 to 4, wherein the spraying pressure and the liquid inlet amount of the atomizer I (2) and the atomizer II (3) can be adjusted.
7. The on-line drying and mixing system for the ultrafine powder according to any one of claims 1 to 4, wherein both the liquid storage tank I (9) and the liquid storage tank II (10) are provided with electric stirrers.
8. The on-line drying and mixing system for ultrafine powder according to any one of claims 1 to 4, wherein the delivery pump I (30A) and the delivery pump II (30B) are respectively a peristaltic pump or a screw pump.
9. The on-line drying and mixing system for ultrafine powder according to any one of claims 1 to 4, wherein the cyclone separator (7) is a wind scoop elongated separator.
10. The method for on-line mixing and drying the ultrafine powder by using the on-line drying and mixing system for ultrafine powder of any one of claims 1 to 9.
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| CN111457677B (en) | 2023-06-27 |
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