CN110538473A - Atomizing disc, spray drying atomizer and method for atomizing high-viscosity material by using atomizing disc - Google Patents
Atomizing disc, spray drying atomizer and method for atomizing high-viscosity material by using atomizing disc Download PDFInfo
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- CN110538473A CN110538473A CN201910812683.3A CN201910812683A CN110538473A CN 110538473 A CN110538473 A CN 110538473A CN 201910812683 A CN201910812683 A CN 201910812683A CN 110538473 A CN110538473 A CN 110538473A
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- atomizing
- atomizing disk
- spray drying
- atomizer
- rotating shaft
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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
-
- 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
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention discloses an atomizing disk, a spray drying atomizer and a method for atomizing high-viscosity materials by using the same. The atomizing disc is a reverse cone-shaped circular table with a large upper part and a small lower part, the circular table is hollow, the side wall of the atomizing disc is provided with a reverse taper hole, the diameter of the reverse taper hole at the inner side of the atomizing disc is large, and the diameter of the reverse taper hole at the outer side of the atomizing disc is small; the side wall of the atomizing disk and the upper horizontal plane of the circular truncated cone form an acute angle. The invention also provides a spray drying atomizer comprising the atomizing disk and a method for atomizing high-viscosity materials by using the spray drying atomizer. The equipment and the method not only solve the problem of atomization of high-viscosity materials, but also solve the problem of wall adhesion of materials around the atomizer at the top of the spray tower.
Description
Technical Field
The invention relates to the field of spray drying, in particular to an atomizing disc, a spray drying atomizer and a method for atomizing high-viscosity materials by using the same.
Background
The microencapsulation technology is a technology of embedding a solid, a liquid or a gas in a micro and sealed capsule to allow controlled release only under specific conditions, wherein the embedded material is called a core material such as vitamin series, and the material embedding the core material to realize microencapsulation is called a wall material such as gelatin, glucose, sucrose, etc. The microencapsulation method is divided into a chemical method, a physicochemical method and a physical method, and is selected according to requirements, wherein the spray drying method is the most common and cheapest microcapsule method at present, and the preparation process comprises the following steps: the core material is dispersed in the liquefied wall material, and the emulsion is weighed, and then the spray granulation and the drying are carried out. In order to achieve better microencapsulation yield, the water content of the microencapsulated emulsion is required to be as low as possible, the particles of the microcapsule are as uniform as possible, and the small particles are reduced as much as possible. The common atomization methods for spray drying in the industry at present are as follows: high-speed centrifugal atomization (maximum viscosity 400cp), pressure spraying (maximum viscosity 500cp) and airflow atomization (maximum viscosity 600 cp). When the atomized material is high-viscosity material (viscosity value is 400-2250 cp), the three atomization methods can not obtain satisfactory atomization effect, and the particle size distribution of the particles obtained by the three atomization methods is wide.
Disclosure of Invention
The invention aims to provide an atomizing disk, a spray drying atomizer and a method for atomizing high-viscosity materials by using the atomizing disk, so as to obtain powder with narrow particle size distribution when the high-viscosity materials are atomized by using a spray drying process.
In order to achieve the purpose, the invention provides an atomizing disc of a spray drying atomizer, which is characterized in that the atomizing disc is a round table with a large upper part and a small lower part and in an inverted cone shape, the round table is hollow, the side wall of the atomizing disc is provided with inverted cone holes (10), the diameter of the end of each inverted cone hole (10) at the inner side of the atomizing disc is large, and the diameter of the end at the outer side of the atomizing disc is small; the side wall of the atomizing disk and the upper horizontal plane of the circular truncated cone form an acute angle.
Further, the diameter of the end of the inverted cone hole (10) at the inner side of the atomizing disc is not more than 1mm, and the diameter of the end at the outer side of the atomizing disc is 100-450 mu m;
Optionally, the included angle between the side wall of the atomizing disk and the upper horizontal plane of the circular truncated cone is 30-90 degrees and does not contain 90 degrees;
Optionally, the inner surface of the inverted cone hole is smooth.
In another aspect, the invention also provides a spray drying atomizer, which is characterized by comprising the atomizing disk.
further, the device also comprises an air guide system, a feeding system and a transmission device.
Furthermore, the air guide system comprises an air guide pipe (1) and a guide groove (4), a plurality of guide vanes with adjustable angles are arranged in the guide groove (4), guide air entering through the air guide pipe (1) is conveyed to the guide groove (4), and the guide air is guided into spiral air through the guide groove (4) to enter the drying tower.
Further, the transmission device comprises a motor (3), a transmission belt (6) and a rotating shaft (9), the rotating shaft (9) is hollow, the rotating shaft (9) rotates under the transmission of the motor (3) and the transmission belt (6), and the rotating shaft (9) drives the atomizing disc (7) to rotate; the lower end of the rotating shaft (9) is connected with the atomizing disc, and the upper end of the rotating shaft is connected with the feeding pipe (2) through the end face seal (5) to form a feeding system. The end faces are connected in a sealing way, so that the material is prevented from leaking.
Furthermore, the angle of the vertical included angle of the guide vanes is 3-30 degrees, and the projections of two adjacent guide vanes in the vertical direction should be partially overlapped.
further, the device also comprises a base (8).
In another aspect, the invention provides a method of atomizing high viscosity materials, characterized in that the spray drying atomizer is used.
further, high-viscosity materials are thrown into the atomizing disc (7) through the feeding pipe (2), the high-viscosity materials rotate along with the rotation of the atomizing disc (7) and are dispersed into uniform fog drops through inverted cone holes in the atomizing disc (7), and the uniform fog drops are swirled into a drying tower by swirling air coming out of the flow guide groove (4) to be dried, so that particles are obtained;
Preferably, the viscosity of the high-viscosity material is 400-2250 cp. The specific treatment scheme is as follows: during atomizing disk was squeezed into through the inlet pipe to high viscosity material, high viscosity material rotated with atomizing disk and dispersed into even granule through atomizing disk's little taper hole, because atomizing disk's lateral wall is full of small back taper hole, high viscosity material sees through this back taper hole under the effect of centrifugal force, because back taper hole is little and even, can form even fog droplet. The guide wind is conveyed to the guide groove by a pipeline and is guided into the spiral wind by the guide vanes in the guide groove when passing through the guide groove. The uniform feed liquid particles passing through the atomizing disk are screwed into the drying tower by the cyclone of the guide groove for drying. The atomizer solves the atomization problem of high-viscosity materials, the particle size of the obtained atomized particles has narrow particle size distribution, and the problem that the materials around the atomizer on the top of the spraying tower are adhered to the wall is solved.
Drawings
Fig. 1 is a schematic structural diagram of an atomizing disk.
Fig. 2 is a schematic diagram of the structure of a spray drying atomizer.
Fig. 3 is a schematic view of guide vanes provided in the guide slots.
Wherein: 1. an air guide pipe; 2. a feed pipe; 3. a motor; 4. a diversion trench (white is hollow, black is a metal body); 5. sealing the end face; 6. a transmission belt; 7. an atomizing disk; 8. a base; 9. a rotating shaft; 10. and (4) forming an inverted taper hole.
Detailed Description
reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
The high temperature spraying and the low temperature spraying which are commonly used in the microcapsule preparation market are taken as examples for illustration. The raw and auxiliary materials used in the microcapsule preparation process are commercially available.
The general complete process is divided into the steps of emulsion preparation, spray granulation, fluidized drying and particle screening.
Preparing an emulsion: a range of viscosities can be prepared as desired for a uniform and stable emulsion, the viscosity test method being shown in table 1;
The particle size distribution was obtained by instrumental testing, the test methods are shown in table 1.
Table 1 item detection method table
Example 1
The following scheme is combined with FIGS. 1-2.
Weighing 20 wt% of vitamin A acetate crystals, 10 wt% of vegetable oil and 2 wt% of BHT, preparing into an oil phase by dissolving oil, weighing 10 wt% of white granulated sugar, 38 wt% of glucose and 20 wt% of gelatin, adding purified water to prepare into a water phase, carrying out high-speed shearing emulsification and high-pressure homogenization on the water phase and the water phase to prepare stable emulsion, wherein the emulsion has the viscosity of 400CP, and is subjected to centrifugal granulation in a spray tower provided with an atomizing disk (the included angle between the side edge of an atomizer and the horizontal is 70 degrees, the vertical included angle of a backflow sheet is 7 degrees, the major diameter of an inverted cone hole is 1mm, and the minor diameter is 100 mu m) at the temperature of an inlet airflow body of. Then, the hot fluid with the temperature of 70 ℃ is fixed and heated and dried in a fixed fluidized bed dryer until the moisture is less than or equal to 5 percent, and then the product is obtained by introducing cold air, reducing the temperature and receiving the material.
The product was tested according to the method shown in table 1 and had a particle size distribution of DV (10) ═ 108 μm, DV (50) ═ 180 μm, and DV (90) ═ 252 μm.
The feed liquid cannot be atomized by centrifugation and pressure atomizers. The particle size distribution using a jet atomizer (air pressure 0.7MPa) was DV (10) ═ 50 μm, DV (50) ═ 125 μm, and DV (90) ═ 200 μm.
example 2
The following scheme is combined with FIGS. 1-2.
Weighing 20 wt% of vitamin A acetate crystals, 10 wt% of vegetable oil and 2 wt% of BHT, preparing into an oil phase by dissolving oil, weighing 10 wt% of white granulated sugar, 38 wt% of glucose and 20 wt% of gelatin, adding purified water to prepare into a water phase, performing high-speed shearing emulsification and high-pressure homogenization on the water phase and the water phase to prepare stable emulsion, wherein the emulsion has the viscosity of 1500CP, and performing centrifugal granulation on the emulsion in a spray tower provided with an atomizing disk (the included angle between the side edge of an atomizer and the horizontal is 80 degrees, the vertical included angle of an inverted flow sheet is 10 degrees, the major diameter of an inverted cone hole is 1mm, and the minor diameter of the inverted cone hole is 250 mu m) at the temperature. Then, the hot fluid with the temperature of 70 ℃ is fixed and heated and dried in a fixed fluidized bed dryer until the moisture is less than or equal to 5 percent, and then the product is obtained by introducing cold air, reducing the temperature and receiving the material.
The product was tested according to the method shown in table 1 and had a particle size distribution of DV (10) ═ 145 μm, DV (50) ═ 250 μm, and DV (90) ═ 395 μm.
The feed liquid can not be atomized by a centrifugal atomizer, a pressure atomizer and an airflow atomizer.
Example 3
The following scheme is combined with FIGS. 1-2.
Weighing 20 wt% of vitamin A acetate crystals, 10 wt% of vegetable oil and 2 wt% of BHT, preparing into an oil phase by dissolving oil, weighing 10 wt% of white granulated sugar, 38 wt% of glucose and 20 wt% of gelatin, adding purified water to prepare into a water phase, and preparing the water phase and the water phase into stable emulsion by high-speed shearing emulsification and high-pressure homogenization, wherein the emulsion has the viscosity of 2250CP, and is subjected to centrifugal granulation in a spray tower provided with the atomizing disk (the included angle between the side edge of the atomizer and the horizontal is 80 degrees, the vertical included angle of the backflow sheet is 15 degrees, the major diameter of the inverted cone hole is 1mm, and the minor diameter of the inverted cone hole is 450 mu m) at the temperature of 30. Then, the hot fluid with the temperature of 70 ℃ is fixed and heated and dried in a fixed fluidized bed dryer until the moisture is less than or equal to 5 percent, and then the product is obtained by introducing cold air, reducing the temperature and receiving the material.
the product was tested according to the method shown in Table 1 and had a particle size distribution of DV (10) ═ 228 μm, DV (50) ═ 378 μm, DV (90) ═ 548 μm.
The feed liquid can not be atomized by a centrifugal atomizer, a pressure atomizer and an airflow atomizer.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (10)
1. An atomizing disk of a spray drying atomizer is characterized in that the atomizing disk is a truncated cone-shaped truncated cone with a large upper part and a small lower part, the truncated cone is hollow, the side wall of the atomizing disk is provided with an inverted cone hole (10), the diameter of the end of the inverted cone hole (10) at the inner side of the atomizing disk is large, and the diameter of the end at the outer side of the atomizing disk is small; the side wall of the atomizing disk and the upper horizontal plane of the circular truncated cone form an acute angle.
2. The atomizing disk of a spray drying atomizer according to claim 1, wherein the diameter of the end of the reverse taper hole (10) on the inner side of the atomizing disk is not more than 1mm, and the diameter of the end on the outer side of the atomizing disk is 100 to 450 μm;
Optionally, the included angle between the side wall of the atomizing disk and the upper horizontal plane of the circular truncated cone is 30-90 degrees and does not contain 90 degrees;
Optionally, the inner surface of the inverted cone hole is smooth.
3. A spray drying atomiser comprising an atomising disc as claimed in claim 1 or 2.
4. The spray drying atomizer of claim 3 further comprising an air deflection system, a feed system, and a transmission.
5. The spray drying atomizer according to claim 4, wherein the air guiding system comprises an air guiding pipe (1) and a guiding gutter (4), a plurality of angle-adjustable guiding vanes are arranged in the guiding gutter (4), guiding air entering through the air guiding pipe (1) is conveyed to the guiding gutter (4), and is guided into a spiral air through the guiding gutter (4) to enter the drying tower.
6. a spray drying atomizer according to claim 4, characterized in that said transmission means comprises a motor (3), a transmission belt (6) and a rotating shaft (9), said rotating shaft (9) is hollow, the rotating shaft (9) is driven by the motor (3) and the transmission belt (6) to rotate, and the rotating shaft (9) drives the atomizing disk (7) to rotate; the lower end of the rotating shaft (9) is connected with the atomizing disc, and the upper end of the rotating shaft is connected with the feeding pipe (2) through the end face seal (5) to form a feeding system.
7. The spray drying atomizer of claim 5, wherein said guide vanes have a vertical included angle of 3-30 degrees, and the projections of two adjacent guide vanes in the vertical direction should partially overlap.
8. A spray dryer atomizer according to claims 3 to 7, characterized by a base (8).
9. A method of atomizing high-viscosity materials, characterized in that a spray-drying atomizer according to any one of claims 3 to 8 is used.
10. The method as claimed in claim 9, characterized in that the high viscosity material is driven into the atomizing disk (7) through the feeding pipe (2), the high viscosity material rotates along with the rotation of the atomizing disk (7) and is dispersed into uniform mist drops through the inverted cone holes on the atomizing disk (7), and the uniform mist drops are swirled into the drying tower by the swirling air from the guiding groove (4) to be dried to obtain particles;
Preferably, the viscosity of the high-viscosity material is 400-2250 cp.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910812683.3A CN110538473B (en) | 2019-08-30 | 2019-08-30 | Atomizing disc, spray drying atomizer and method for atomizing high-viscosity material by using atomizing disc |
| PCT/CN2020/093965 WO2021036385A1 (en) | 2019-08-30 | 2020-06-02 | Atomizing tray, spray drying atomizer and high viscosity material atomizing method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910812683.3A CN110538473B (en) | 2019-08-30 | 2019-08-30 | Atomizing disc, spray drying atomizer and method for atomizing high-viscosity material by using atomizing disc |
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| CN110538473A true CN110538473A (en) | 2019-12-06 |
| CN110538473B CN110538473B (en) | 2021-10-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021036385A1 (en) * | 2019-08-30 | 2021-03-04 | 厦门金达威维生素有限公司 | Atomizing tray, spray drying atomizer and high viscosity material atomizing method therefor |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114712873B (en) * | 2022-06-09 | 2022-11-25 | 山东颐工材料科技股份有限公司 | ACR spray drying tower drying device |
| CN115532168A (en) * | 2022-10-18 | 2022-12-30 | 江苏福瑞达新材料有限公司 | Granulation equipment for chemical materials and use method thereof |
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2019
- 2019-08-30 CN CN201910812683.3A patent/CN110538473B/en active Active
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2020
- 2020-06-02 WO PCT/CN2020/093965 patent/WO2021036385A1/en active Application Filing
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| Publication number | Publication date |
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| WO2021036385A1 (en) | 2021-03-04 |
| CN110538473B (en) | 2021-10-08 |
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