CN114699780B - Atomizer and powder preparation facilities of direct preparation of superfine spherical powder that agglomerates - Google Patents
Atomizer and powder preparation facilities of direct preparation of superfine spherical powder that agglomerates Download PDFInfo
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- CN114699780B CN114699780B CN202210280628.6A CN202210280628A CN114699780B CN 114699780 B CN114699780 B CN 114699780B CN 202210280628 A CN202210280628 A CN 202210280628A CN 114699780 B CN114699780 B CN 114699780B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/16—Evaporating by spraying
- B01D1/18—Evaporating by spraying to obtain dry solids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/16—Evaporating by spraying
- B01D1/20—Sprayers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
- B01J2/04—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops in a gaseous medium
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Abstract
The invention relates to the technical field of powder preparation, in particular to an atomizer for directly preparing ultrafine agglomerated spherical powder and a powder preparation device. The atomizer comprises a feeding pipe, an air inlet pipe and a gas-material mixing cavity; the feeding pipe is detachably inserted into the gas-material mixing cavity in a penetrating manner, a nozzle is formed in the gas-material mixing cavity, the discharging end of the feeding pipe is opposite to the nozzle, a first annular boss is arranged in the gas-material mixing cavity, a second annular boss is arranged on the outer wall of the feeding pipe, and the first annular boss and the second annular boss are in sealing fit through a gasket; an air flow channel is arranged between the air-material mixing cavity and the feeding pipe and surrounds the periphery of the air inlet pipe; the air inlet pipe is communicated with the air flow channel, and the air outlet end of the air inlet pipe is opposite to the side wall of the feeding pipe. According to the atomizer and the powder preparation device for directly preparing the superfine agglomerated spherical powder, the particle size range of the powder is not easy to generate large fluctuation, the fluctuation of the fluidization factor of the powder is small, and further, the stability of coating deposition is improved.
Description
Technical Field
The invention relates to the technical field of preparation of powder for a thermal barrier coating for plasma physical vapor deposition, in particular to an atomizer for directly preparing ultrafine agglomerated spherical powder and a powder preparation device.
Background
Thermal Barrier Coating (TBC) is widely applied to the surface of hot end components of gas turbine engines, is one of three key manufacturing technologies of high-pressure turbine blades of gas turbine engines, is an indispensable Thermal protection technology of modern high-performance gas turbine engines, has good heat insulation, high-temperature oxidation resistance and corrosion resistance, and can significantly improve the service temperature and service life of the hot end components. The thermal barrier coating preparation technology for obtaining batch application at present mainly comprises Atmospheric Plasma Spraying (APS) and Electron beam physical vapor deposition (EB-PVD), wherein the Atmospheric plasma spraying raw material is spherical or nearly spherical powder with D50 of dozens of microns, the common particle size range of the powder is 10-110 mu m or 45-75 mu m, the powder has good fluidity and proper loose packing density, and a coating with a microstructure and a performance-controllable layered structure can be obtained; the electron beam physical vapor deposition process uses ceramic target materials, stably evaporates the target materials to obtain atomic-scale vapor deposition to form a columnar crystal structure coating. The Plasma spraying-physical vapor deposition (PS-PVD) technology is a spraying/deposition technology developed on the basis of APS and EB-PVD technologies and under a controllable atmosphere ultra-low pressure environment, combines the advantages of Plasma spraying melting deposition and physical vapor deposition gasification vapor deposition processes, can realize a typical solid-liquid-gas three-phase composite deposition technology through process adjustment, can prepare a thermal barrier coating ceramic layer with a columnar crystal or quasi-columnar structure, and is considered as one of core technologies for thermal barrier coating development in the future.
In the PS-PVD process, powder can be rapidly dispersed into fine particles at the position of an anode outlet of a spray gun, the fine particles can be sufficiently melted and gasified in high-temperature/high-speed (12500K, 200Pa pressure of 3200 m/s), large-diameter (200-400 mm) and long plasma (the longest length can reach 2000 mm), a binder in the powder can be required to be rapidly volatilized, rapid sintering caused by closed pores is avoided, the powder is broken into finer particles, the powder is ensured to fly at the center of the plasma as far as possible, good acceleration, melting and gasification are realized, and the preparation of a high-performance PS-PVD thermal barrier coating is realized. The PS-PVD powder needs to be agglomerated and granulated by adopting nano-scale raw materials, has a small particle size range (1-30 mu m) and self-fluidity, and is convenient to obtain a coating with high deposition efficiency and a target microstructure. Conventional agglomeration granulation means, such as high-speed centrifugal spray drying technology, are difficult to realize the preparation of the powder with the narrow particle size range, and a suitable means needs to be found.
The conventional gas-flow convection multi-fluid atomization mode can only obtain aggregates in a certain particle size range only through the type of an atomizer, the particle size range of powder needs to be accurately controlled, the structure of an atomization tower of a powder preparation device needs to be optimally designed, the problem of stable obtaining is creatively solved, and the problem that the particle size range of batch powder has larger fluctuation to influence the stability of deposition is avoided. At present, no relevant research and engineering technicians attempt in the field, and how to further realize the controllable preparation of the special powder is the focus of attention of the researchers in the technical field.
Disclosure of Invention
The invention aims to provide an atomizer for directly preparing superfine agglomerated spherical powder and a powder preparation device, which are used for realizing the direct preparation of the superfine agglomerated self-flowing spherical powder with higher batch stability, and realizing a smoother powder feeding effect, a more optimized process adaptation effect and a wider process adaptation window.
The atomizer directly prepared from the superfine agglomerated spherical powder comprises a feed pipe for injecting slurry, an air inlet pipe for introducing high-pressure air and an air-material mixing cavity.
The inlet pipe can be dismantled the interlude in the gas material hybrid chamber, the spout has been seted up on the gas material hybrid chamber, the discharge end of inlet pipe with the spout sets up relatively, be provided with first annular boss in the gas material hybrid chamber, be provided with second annular boss on the outer wall of inlet pipe, first annular boss with through the sealed cooperation of gasket between the second annular boss.
A gas flow channel exists between the gas-material mixing cavity and the feeding pipe, and the gas flow channel surrounds the feeding pipe; the intake pipe with airflow channel communicates with each other, just the end of giving vent to anger of intake pipe with the lateral wall of inlet pipe is relative.
Compared with the prior art, the invention has the beneficial effects that:
according to the atomizer directly prepared from the superfine agglomerated spherical powder, slurry can be conveyed to the position close to the nozzle in the gas-material mixing cavity through the feeding pipe, and high-pressure gas can be conveyed to the gas flow channel in the gas-material mixing cavity through the gas inlet pipe; high-pressure gas can flow towards the nozzle along the airflow channel who encircles the inlet pipe after getting into airflow channel, meets with the ground paste at the discharge end of inlet pipe, and ground paste can the quick broken liquid drop atomizing under high-pressure gas flow's effect, becomes the powder for high temperature drying on next step, provides the ground paste that obtains after the atomizing.
It should be noted that, in the invention, the first annular boss is additionally arranged in the gas-material mixing cavity, correspondingly, the second annular boss is additionally arranged on the outer wall of the feed pipe, and the first annular boss and the second annular boss are in sealing fit through the gasket, namely, the gas flow channel only has one outlet of the nozzle, so that high-pressure gas cannot leak, and the atomization effect of the high-pressure gas on the slurry is ensured.
Particularly, the feeding pipe in the invention can be detachably inserted into the gas-material mixing cavity, the gas outlet end of the gas inlet pipe is opposite to the side wall of the feeding pipe, and after slurry is changed, the thickness of the gasket can be changed according to the characteristics of the slurry, so that the distance between the gas outlet end of the gas inlet pipe and the discharge end of the feeding pipe is ensured, and the regulation of the atomization effect of the broken liquid drops is realized.
Therefore, when slurry is changed, the atomizer directly prepared from the ultrafine agglomerated spherical powder can meet the requirement of the particle size of the powder formed by drying atomized liquid drops by replacing the gasket, so that the particle size range of the powder is not easy to generate larger fluctuation, the fluctuation of the fluidization factor of the powder is smaller, and the stability of coating deposition is further improved.
Preferably, as an embodiment, the air flow channel is a spiral channel;
and/or, the inlet pipe be located the second annular boss with position between the discharge end is straight section of thick bamboo pipeline, just straight section of thick bamboo pipeline with second annular boss is perpendicular, the air current direction of the end of giving vent to anger of intake pipe with straight section of thick bamboo pipeline is perpendicular.
Preferably, as an implementation mode, a region of the gas-material mixing cavity between the first annular boss and the spout is a cylindrical cavity, and a spiral groove is formed in the outer wall of the straight-tube pipeline.
Preferably, as an implementation mode, a feed inlet is formed in the gas-material mixing chamber, the feed inlet is arranged opposite to the nozzle, and the feed pipe is a cylindrical straight pipe;
and/or an air inlet is formed in the air material mixing cavity and is in threaded fit with the air inlet pipe.
The powder preparation device provided by the invention comprises the atomizer.
Preferably, as an implementable mode, the powder preparation device further comprises a primary collecting tower, a secondary collecting tower, a hot air supply device, an induced draft fan and a dust removal device.
Hot-blast feeding device is used for toward inject high-temperature air in the one-level collection tower, the powder entry has been seted up on the one-level collection tower, the atomizer install in the powder entry, just the spout orientation of atomizer the inside in one-level collection tower.
The one-level collecting tower with the second grade collecting tower passes through the tuber pipe intercommunication, be provided with dust collector in the second grade collecting tower, dust collector be used for filtering by the powder that the tuber pipe sent into, the second grade collecting tower with the air intake intercommunication of draught fan.
Preferably, as an implementable mode, the atomizer is located at the top of the primary collection tower;
and/or one end of the air pipe, which is positioned in the primary collecting tower, is connected with an elbow pipe, and the pipe orifice of the elbow pipe is arranged downwards.
Preferably, as an embodiment, the ratio of the volume of the secondary collection tower to the volume of the primary collection tower ranges from 1/3 to 1/2.
Preferably, as an implementation mode, the dust removing device comprises a bag-type dust remover, and the bag-type dust remover is mounted at the end part of the air pipe;
and/or, the powder preparation device further comprises a spray dust remover, and the spray dust remover is communicated with the air outlet of the induced draft fan.
Preferably, as an implementation mode, the hot air supply device includes a blower, a heater and a filter element, the filter element is installed at an air inlet of the blower, an air outlet of the blower is communicated with the primary collection tower, and the heater is used for heating air at an air outlet of the blower.
The powder preparation device provided by the invention comprises the atomizer, so that when slurry changes, the size of powder formed after atomized liquid drops are dried can meet the requirement by replacing the gasket, the particle size range of the powder is not easy to generate larger fluctuation, the fluctuation of the fluidization factor of the powder is smaller, and further, the stability of coating deposition is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic perspective view of an atomizer according to an embodiment of the present invention;
FIG. 2 is an enlarged view of portion A of FIG. 1;
fig. 3 is a schematic perspective view of a powder preparation apparatus according to an embodiment of the present invention;
fig. 4 is a sectional view of a part of the structure of a powder preparation apparatus according to an embodiment of the present invention.
Description of the reference numerals:
100-an atomizer; 110-feed pipe; 111-a second annular boss; 120-an intake pipe; 130-gas material mixing cavity; 131-a nozzle; 132-a first annular boss; 133-gas flow channel; 140-a gasket;
200-first order collection tower; 210-powder inlet;
300-a secondary collection column;
400-hot air supply means;
500-induced draft fan;
600-air pipe;
700-bending a pipe;
800-spray dust remover.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings only for the convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be construed broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
The invention is described in further detail below by means of specific embodiments and with reference to the attached drawings.
Referring to fig. 1 and fig. 2, this embodiment provides an atomizer 100 for directly preparing ultrafine agglomerated spherical powder, which includes a feeding pipe 110 for injecting slurry, an inlet pipe 120 for introducing high-pressure gas, and a gas-material mixing chamber 130; the feeding pipe 110 is detachably inserted into the gas-material mixing chamber 130 in a penetrating manner, a nozzle 131 is formed in the gas-material mixing chamber 130, the discharging end of the feeding pipe 110 is arranged opposite to the nozzle 131, a first annular boss 132 is arranged in the gas-material mixing chamber 130, a second annular boss 111 is arranged on the outer wall of the feeding pipe 110, and the first annular boss 132 and the second annular boss 111 are in sealing fit through a gasket 140; a gas flow channel 133 exists between the gas-material mixing cavity 130 and the feeding pipe 110, and the gas flow channel 133 surrounds the feeding pipe 110; the inlet pipe 110 communicates with the gas flow channel 133, and the outlet end of the inlet pipe 120 is opposite to the sidewall of the inlet pipe 110.
In the atomizer 100 directly prepared from the ultrafine agglomerated spherical powder provided in this embodiment, slurry can be sent to the position near the nozzle 131 in the gas-material mixing chamber 130 through the feeding pipe 110, and high-pressure gas can be sent to the gas flow channel 133 in the gas-material mixing chamber 130 through the gas inlet pipe 120; high-pressure gas can flow towards spout 131 along the airflow channel 133 around inlet pipe 110 after getting into airflow channel 133, meets with the ground paste at the discharge end of inlet pipe 110, and ground paste can the liquid drop atomizing of quick breakage under high-pressure gas flow's effect, for next step high temperature drying becomes the powder, provides the ground paste after obtaining the atomizing.
It should be noted that, in this embodiment, the first annular boss 132 is additionally provided in the gas-material mixing chamber 130, and correspondingly, the second annular boss 111 is additionally provided on the outer wall of the feeding pipe 110, and the first annular boss 132 and the second annular boss 111 are in sealing fit through the gasket 140, that is, the gas flow channel 133 only has one outlet of the nozzle 131, so that the high-pressure gas cannot leak, and the atomization effect of the high-pressure gas on the slurry is ensured.
Particularly, in this embodiment, the feeding pipe 110 is detachably inserted into the gas-material mixing chamber 130, and the gas outlet end of the gas inlet pipe 120 is opposite to the side wall of the feeding pipe 110, so that after slurry is changed, the thickness of the gasket 140 can be changed according to the characteristics of the slurry, and the distance between the gas outlet end of the gas inlet pipe 120 and the discharge end of the feeding pipe 110 is increased, thereby adjusting the atomization effect of the broken liquid droplets.
Therefore, when slurry changes, the atomizer 100 directly prepared from the ultrafine agglomerated spherical powder provided by the embodiment can meet the requirement of the particle size of the powder formed after the atomized liquid drops are dried by replacing the gasket 140, so that the particle size range of the powder is not easy to generate large fluctuation, the powder fluidization factor fluctuation is small, the smooth powder feeding effect can be realized, and further, the stability of coating deposition is improved.
In addition, the atomizer 100 of the present embodiment can adjust the atomization effect of multiple slurries to a suitable degree, so that a more optimized process adaptation effect and a wider process adaptation window can be obtained.
Specifically, the airflow channel 133 is configured as a spiral channel, so that the airflow can flow along the airflow channel 133 to form a spiral airflow after entering the airflow channel 133 from the air inlet pipe 120, which is more beneficial to break up droplet atomization.
Preferably, the part of the feeding pipe 110 between the second annular boss 111 and the discharging end is set to be a straight pipe, the straight pipe is set to be perpendicular to the second annular boss 111, and the air flow direction of the air outlet end of the air inlet pipe 110 is perpendicular to the straight pipe, so that the thickness of the spare gasket 140 can be reduced and the cost can be reduced on the premise that the types of the slurry are consistent; in addition, the structure can obtain better sealing performance more easily.
The thickness of the spacer 140 may be set to a range of 0-5mm, in which a plurality of spacers 140 having different thicknesses are prepared.
Specifically, the area of the gas-material mixing cavity 130 between the first annular boss 132 and the nozzle 131 may be a cylindrical cavity, and on the basis, a spiral groove is formed on the outer wall of the straight-tube pipeline, so that the spiral gas flow channel 133 may be enclosed by the spiral groove and the cavity wall of the cylindrical cavity.
The feed inlet can be formed in the gas-material mixing cavity 130, the feed inlet pipe 110 is inserted into the gas-material mixing cavity 130 from the feed inlet, the matching of the feed inlet pipe 110 and the gas-material mixing cavity 130 can be realized, the feed inlet pipe 110 is preferably set to be a cylindrical straight pipe, the installation is simple and convenient, and at the moment, the feed inlet and the nozzle 131 are respectively positioned on the opposite cavity walls of the gas-material mixing cavity 130.
Still can set up the air inlet on gas material hybrid chamber 130, with above-mentioned intake pipe 120 and air inlet threaded connection, so, be convenient for guarantee the leakproofness of intake pipe 120 and air inlet, and can realize the dismantlement of intake pipe 120.
Referring to fig. 1 to 4, the present embodiment further provides a powder preparation apparatus, which includes the atomizer 100.
Therefore, the powder preparation device provided by the embodiment can meet the requirement of the particle size of the powder formed after the atomized liquid drops are dried by replacing the gasket 140 when the injected slurry changes, the particle size range of the powder is not easy to generate larger fluctuation, the powder fluidization factor fluctuation is smaller, and further, the stability of coating deposition is improved.
The specific structure of the powder preparation apparatus provided in this embodiment is further provided with a primary collection tower 200, a secondary collection tower 300, a hot air supply device 400 and an induced draft fan 500, wherein the hot air supply device 400 can inject high-temperature air into the primary collection tower 200 to raise the temperature in the primary collection tower 200; the nozzle 131 of the atomizer 100 sprays atomized slurry into the primary collection tower 200, the atomized slurry can contact the high-temperature environment in the primary collection tower 200 at the moment of spraying, and the atomized slurry can be dried to form powder under the action of instant high temperature; the induced draft fan 500 can introduce the air mixed with the powder in the primary collecting tower 200 into the secondary collecting tower 300, and discharge the air after the dust is removed by the dust removing device.
Before preparing the powder, the hot air supply device 400 is started to form a high-temperature environment in the primary collection tower 200; when powder is prepared, the induced draft fan 500 is started, high-pressure gas and slurry are injected into the atomizer 100, and the slurry is atomized and sprayed out by the atomizer 100; after the atomized slurry is dried by high-temperature air in the primary atomizing tower 200 to form powder, part of the powder can sink to the bottom of the primary collecting tower 200 under the action of self weight, and other powder can enter the secondary collecting tower 300 through an air pipe under the drive of airflow; most of the powder entering the secondary collecting tower 300 is filtered and intercepted by the dust removal device and is retained in the secondary collecting tower 300, a small amount of dust passes through the dust removal device and is sucked out of the secondary collecting tower by the induced draft fan 500, so that secondary collection of the powder is realized, and the average particle size of the powder collected in the primary collecting tower 200 is larger, namely the powder with larger particle size is high in content; the average particle size of the powder collected in the secondary collection tower 300 is small, i.e., the powder with small particle size has high content.
During actual powder preparation, the thickness of the spacer 140 on the atomizer 100 and the air volume of the induced draft fan 500 can be adjusted according to the slurry performance, and the particle size range of the powder and the ratio of different particle size ranges are maintained in a variable range, so that the deposition stability and the powder flowability of the powder are ensured. In addition, when the actual powder is prepared, the thickness of the gasket 140 on the atomizer 100 and the air volume of the induced draft fan 500 can be adjusted according to the coating requirement, so that the prepared powder can meet the coating quality requirement.
The content of the powder with the particle size larger than 5 microns is increased, and a small amount of powder with the particle size larger than 20 microns is prepared, so that the particle size range of the powder is widened, the powder flowing effect can be improved, and the powder conveying effect when the PS-PVD process is suitable is improved; preferably, the particle size range of the powder collected by the bag-type dust collector is controlled within 1-25 mu m, and the powder fluidization factor is controlled to be about 1.15.
The induced draft fan 500 can adopt differential pressure and air quantity coupling control, the differential pressure between the air pressure in the primary collecting tower 200 and the atmospheric pressure is controlled within 0.03-0.06 kPa, the differential pressure is used as an input quantity, the frequency of the induced draft fan 500 is adjusted as a control quantity, and the fluctuation range of the differential pressure in a set value is lower than +/-5%.
The maximum air draft F of the induced draft fan 500 is 20-25% of the sum of the volumes of the first-stage collecting tower 200 and the second-stage collecting tower 300, and is not lower than 20%; the draught fan 500 is selected to be stepless frequency conversion and speed change, and the frequency conversion range is 20-50 Hz.
Specifically, the atomizer 100 is arranged at the top of the first-stage collecting tower 200, so that the atomized slurry sprayed from the atomizer 100 falls from top to bottom under the action of the self-weight after being dried into powder, and part of the powder can be smoothly brought into the air pipe 600 by the airflow in the falling process, thereby ensuring the amount of the powder entering the second-stage collecting tower 300.
Preferably, one end of the air pipe 600, which is located in the primary collecting tower 200, is connected with the elbow 700, and the orifice of the elbow 800 is arranged downward, so that the content of small-particle-size (1-20 μm or 1-30 μm) powder which is rapidly sucked into the secondary collecting tower 300 under the shearing action of high-pressure air flow due to low self weight can be reduced, and on one hand, the powder deposition efficiency can be improved; on the other hand, the content of the small-particle-size powder collected by the primary collection tower 200 can be effectively improved, so that the utilization rate of the powder collected in the primary collection tower 200 is improved, and the gasification effect of the powder in the PS-PVD process can be effectively improved.
Since the second-stage collecting tower 300 collects a large amount of small-particle-size powder, even if a part of the small-particle-size powder is collected by the first-stage collecting tower 200, the content of the small-particle-size powder in the second-stage collecting tower 300 is not substantially affected.
The content of fine particle size powder with the particle size range of 1-30 mu m or 1-20 mu m, which is obtained from the bottom of the first-stage collecting tower 200, can reach 72 percent, and the powder deposition efficiency can reach 5.0 mu m/g.
In addition, the bent pipe 700 may be provided as an integral structure with the air duct 600, and the bent pipe 700 may also be a separate structure and connected to the end of the air duct 600. Specifically, the wind pipe 600 may be arranged in a zigzag manner, so as to reduce the content of the small-particle-size powder that is rapidly sucked into the secondary collecting tower 300 due to its low self-weight.
Preferably, the ratio of the volume of the secondary collecting tower 300 to the volume of the primary collecting tower 200 may be set to 1/3 to 1/2, so that the powder collecting rate is high and the mass ratio of the powder collected in the primary collecting tower 200 to the powder collected in the secondary collecting tower 300 meets the requirement.
The dust removing device may include a bag-type dust remover, the bag-type dust remover is installed at the end of the air pipe 600 to smoothly intercept the powder blown out by the air pipe 600, and the powder intercepted by the bag-type dust remover may finally fall to the bottom of the secondary collecting tower 300, so that most of the powder blown out by the air pipe 600 can be collected by the secondary collecting tower 300.
Can set up spray dust remover 800 in the concrete structure of the powder preparation facilities that this embodiment provided, will spray dust remover 800 and draught fan 500's air outlet intercommunication, so, the dust that is not intercepted by the sack cleaner can be sprayed the interception in spray dust remover 800 after draught fan 500 discharges, realizes the second grade and removes dust, reduces the dust of discharging in the external environment, alleviates the dust pollution problem.
Specifically, the hot air supply device 400 may include a blower, a heater, and a filter member, the filter member is mounted to an air inlet of the blower to filter air to be introduced into the blower by the filter member, reduce impurities in the air introduced into the primary collection tower 200, communicate an air outlet of the blower with the primary collection tower 200, and heat the air at the air outlet of the blower by the heater to ensure that the air introduced into the primary collection tower 200 is high-temperature air.
In summary, the embodiment of the invention discloses an atomizer and a powder preparation device for directly preparing ultrafine agglomerated spherical powder, which overcome many technical defects of the traditional powder preparation device. According to the atomizer and the powder preparation device for directly preparing the superfine agglomerated spherical powder, provided by the embodiment of the invention, when slurry is changed, the size of powder formed by drying atomized liquid drops can meet the requirement by replacing the gasket, so that the particle size range of the powder is not easy to generate larger fluctuation, the powder fluidization factor fluctuation is smaller, and further, the stability of coating deposition is improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An atomizer for directly preparing superfine agglomerated spherical powder is characterized by comprising a feed pipe (110) for injecting slurry, an air inlet pipe (120) for introducing high-pressure gas and a gas-material mixing cavity (130);
the feeding pipe (110) is detachably inserted into the gas-material mixing cavity (130), a nozzle (131) is formed in the gas-material mixing cavity (130), the discharging end of the feeding pipe (110) is opposite to the nozzle (131), a first annular boss (132) is arranged in the gas-material mixing cavity (130), a second annular boss (111) is arranged on the outer wall of the feeding pipe (110), and the first annular boss (132) is in sealing fit with the second annular boss (111) through a gasket (140);
a gas flow channel (133) exists between the gas-material mixing cavity (130) and the feeding pipe (110), and the gas flow channel (133) surrounds the feeding pipe (110); the air inlet pipe (120) is communicated with the air flow channel (133), and the air outlet end of the air inlet pipe (120) is opposite to the side wall of the feeding pipe (110);
the inlet pipe (110) be located second annular boss (111) with position between the discharge end is straight section of thick bamboo pipeline, just straight section of thick bamboo pipeline with second annular boss (111) are perpendicular, the air current direction of the end of giving vent to anger of intake pipe (120) with straight section of thick bamboo pipeline is perpendicular.
2. A nebulizer as claimed in claim 1, wherein the airflow channel (133) is a helical channel.
3. The atomizer according to claim 2, wherein the region of the gas-material mixing chamber (130) between the first annular boss (132) and the nozzle orifice (131) is a cylindrical cavity, and the outer wall of the straight-tube conduit is provided with a spiral groove.
4. The atomizer according to claim 1, wherein a feed inlet is opened on the gas-material mixing chamber (130), the feed inlet is arranged opposite to the nozzle (131), and the feed pipe (110) is a cylindrical straight pipe;
and/or an air inlet is formed in the air material mixing cavity (130), and the air inlet is in threaded fit with the air inlet pipe (120).
5. A powder production apparatus comprising the atomizer (100) according to any one of claims 1 to 4.
6. The powder preparation apparatus according to claim 5, further comprising a primary collection tower (200), a secondary collection tower (300), a hot air supply apparatus (400), an induced draft fan (500), and a dust removal apparatus;
the hot air supply device (400) is used for injecting high-temperature air into the primary collection tower (200), a powder inlet (210) is formed in the primary collection tower (200), the atomizer (100) is installed at the powder inlet (210), and a nozzle of the atomizer (100) faces the inside of the primary collection tower (200);
one-level collecting tower (200) with second grade collecting tower (300) are through tuber pipe (600) intercommunication, be provided with dust collector in second grade collecting tower (300), dust collector be used for filter by the powder that tuber pipe (600) were sent into, second grade collecting tower (300) with the air intake intercommunication of draught fan (500).
7. The powder preparation apparatus according to claim 6, wherein the atomizer (100) is located at the top of the primary collection tower (200);
and/or one end of the air pipe (600) in the primary collecting tower (200) is connected with an elbow pipe (700), and the pipe orifice of the elbow pipe (700) is arranged downwards.
8. The powder preparation apparatus according to claim 6, wherein the ratio of the volume of the secondary collection tower (300) to the volume of the primary collection tower (200) is in a range of 1/3 to 1/2.
9. The powder preparation apparatus according to claim 6, wherein the dust removal device comprises a bag-type dust remover, and the bag-type dust remover is mounted at an end of the air duct (600);
and/or, the powder preparation device further comprises a spray dust collector (800), and the spray dust collector (800) is communicated with an air outlet of the induced draft fan (500).
10. The powder manufacturing apparatus according to claim 6, wherein the hot air supply device (400) includes a blower, a heater, and a filter, the filter is installed at an air inlet of the blower, an air outlet of the blower is communicated with the primary collection tower, and the heater is used for heating air at an air outlet of the blower.
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| CN202210280628.6A CN114699780B (en) | 2022-03-22 | 2022-03-22 | Atomizer and powder preparation facilities of direct preparation of superfine spherical powder that agglomerates |
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| CN202210280628.6A CN114699780B (en) | 2022-03-22 | 2022-03-22 | Atomizer and powder preparation facilities of direct preparation of superfine spherical powder that agglomerates |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2121066C3 (en) * | 1971-04-29 | 1974-05-30 | Knapsack Ag, 5033 Huerth-Knapsack | Atomizing nozzle for an atomizing dryer |
| AU2006207868A1 (en) * | 2002-03-20 | 2006-09-28 | Alkermes, Inc. | Method and apparatus for producing dry particles |
| RU2671748C2 (en) * | 2013-09-20 | 2018-11-06 | Спрэинг Системс Ко. | High efficiency / low pressure catalytic cracking spray nozzle assembly |
| CN104399615A (en) * | 2014-10-31 | 2015-03-11 | 中国神华能源股份有限公司 | Atomization injection device |
| CN208482022U (en) * | 2018-04-19 | 2019-02-12 | 滁州学院 | A kind of spray-drying installation installing fuel gas hot-blast stove additional |
| CN209735001U (en) * | 2019-01-29 | 2019-12-06 | 洛阳中超新材料股份有限公司 | Spray nozzle for spray dryer |
| CN210675091U (en) * | 2019-09-02 | 2020-06-05 | 安疗生命科学（武汉）有限公司 | Array type coaxial electrostatic spraying device |
| CN212505067U (en) * | 2020-07-02 | 2021-02-09 | 包头市宏正机械科技有限公司 | Laser cladding nozzle |
| CN214347282U (en) * | 2020-11-30 | 2021-10-08 | 广西水力机械研究所有限公司 | Gas-liquid double-fluid cyclone atomization spraying nozzle |
| CN214130322U (en) * | 2021-06-28 | 2021-09-07 | 中国科学院大气物理研究所 | System for realizing zero emission of dry waste gas |
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