WO2019224967A1

WO2019224967A1 - Spray disk, spray device, and spray-drying apparatus

Info

Publication number: WO2019224967A1
Application number: PCT/JP2018/019960
Authority: WO
Inventors: 晋介加藤
Original assignee: 株式会社プリス
Priority date: 2018-05-24
Filing date: 2018-05-24
Publication date: 2019-11-28
Also published as: JP7007759B2; JPWO2019224967A1

Abstract

Provided are: a spray disk that is capable of appropriately introducing a sprayed feedstock liquid in the direction of the lower part of a drying unit without allowing the same to adhere to the side walls inside the drying unit; a spray device that uses said spray disk; and a spray-drying apparatus that uses said spray device. The present invention is: a spray disk provided with a spraying member for spraying a supplied feedstock liquid in a specified spraying direction and a turning member for turning the spraying direction of the feedstock liquid vertically downward; a spray device with a rotation unit for rotating the spray disk at a specified rotation speed; and a spray-drying apparatus comprising said spray device, a feedstock liquid-supplying unit for supplying the feedstock liquid to the inside of the spray disk via an opening of an upper rotating plate, and a powder-forming unit for forming a dry powder by drying the feedstock liquid sprayed from the spray disk.

Description

Spraying plate, spraying device, and spray drying device

The present invention relates to a spray plate used when producing a dry powder by drying a raw material liquid such as a sprayed solution or slurry, a spray device using the spray plate, and a spray drying device using the spray device It is about.

Spray drying apparatuses that produce dry powder (granules) by drying raw material liquids such as sprayed solutions and slurries with hot air, for example, in the field of manufacturing food products, pharmaceuticals, metal materials, industrial materials, etc. It is used a lot. A general spray-drying apparatus evaporates the solvent contained in the raw material liquid by contacting the sprayed raw material liquid with hot air or the like at least by spraying the raw material liquid such as a solution or slurry. A drying unit that generates dry powder.

In a normal co-current type spray drying apparatus, a spray unit is provided at a substantially central portion of the top surface of the drying unit, and the raw material liquid sprayed by the spray unit is brought into contact with a high-temperature gas (for example, hot air). While the solvent evaporates, it naturally falls to the lower part of the drying unit and is recovered as a dry powder. At this time, the dry powder having a small particle size and easily mixed in the exhaust stream can be recovered together with the exhaust of the high temperature gas by a cyclone type dust collector provided in the exhaust means.

A rotating disk, a pressure nozzle, a two-fluid nozzle, etc. are used as the spraying part. Among them, a rotating powder is obtained because a dry powder having a sharp viscosity distribution is obtained, and the particle diameter is easily controlled. Is often selected. There are various disk shapes such as a vane type, a pin type, and a Kessner (bell) type in the rotating disk, and they are properly used according to the intended use and environment (for example, see Patent Document 1).

JP 2002-128570 A

Rotating discs are generally called spray plates, and the pin type is configured as a rotating body in which two rotating plates having a disc shape are combined. The rotating disk rotates at a high speed of about 1000 to 60000 rpm by the driving force transmitted through the rotating shaft, and sprays the supplied raw material liquid such as solution and slurry by the centrifugal force. However, since the conventional rotating disk sprays the raw material liquid in the direction of arrow A, which is horizontal with respect to the rotating shaft, like the rotating disk (spray plate 900) illustrated in FIG. 12, the rotation speed is low. In some cases, the condition of spraying large droplets, or when the specific gravity of the raw material liquid is large and the flight distance becomes long, the raw material liquid is insufficiently dried. There is a problem in that the contact is increased in an undried or semi-dried state, so that it cannot be recovered as a dry powder and the yield is reduced. In addition, when the rotational speed of the spray by the rotating disk becomes higher, the jet spreads upward, the raw material liquid adheres to the top surface of the drying section, and the yield decreases. Also, the raw material liquid is deposited on the upper rotating plate of the rotating disk. As a result, the weight balance of the rotating disk is lost, and proper spraying cannot be performed. In the worst case, the spraying device is damaged.

Further, according to the recent research by the inventors of the present application, the rotating disk rotates at a high speed, so that there is an air flow from the arrow B direction toward the inside of the rotating disk to the arrow C direction toward the outside (upper side) of the rotating disk. It is clear to do. This suggests that the air flow acting in the reverse direction with respect to the normal spray direction can be a factor that inhibits the reverse flow of the raw material liquid in the rotating disk or the normal flow of the raw material liquid.

This invention is made | formed in view of such an actual condition, and the subject of this invention is introduce | transduced appropriately in the drying part lower direction of the perpendicular downward side, without making the sprayed raw material liquid adhere to a drying part inner side wall. It is providing the spray board which can be used, the spray apparatus using the said spray board, and the spray drying apparatus using the said spray apparatus.

As a result of earnest research to solve the above problems, the inventor of the present application has found that the above problems can be solved by utilizing the so-called Coanda effect in which the fluid is attracted to the adjacent wall (surface). The invention has been completed.

That is, according to the first aspect of the present invention, the apparatus includes a spraying member that sprays the supplied raw material liquid in a predetermined spraying direction, and a turning member that turns the spraying direction of the raw material liquid downward vertically. There is provided a spraying board characterized by:

According to a second aspect of the present invention, in the first aspect, the spray member is connected to the upper rotary plate having an opening in the center and the upper rotary plate, and is connected to the upper rotary plate. A pin-type spray mechanism including a lower rotating plate having a parallel plane, and the turning member has an edge portion extending vertically downward from the plane of the lower rotating plate. A spraying plate is provided.

According to a third aspect of the present invention, in the second aspect, the lower rotary plate is formed in a disc shape, and the edge portion is formed as an inclined surface extending in an annular shape from the outer edge portion of the plane. There is provided a spray disc characterized in that:

Further, according to the fourth aspect of the present invention, there is provided the spray plate according to the third aspect, wherein the inclined surface has an inclination of 5 ° to 90 ° with respect to the plane.

According to a fifth aspect of the present invention, there is provided the spray disk according to the first aspect, wherein the spray member includes any one of a Kessner type, a vane type, and a slit vane type spray mechanism. Provided.

According to the sixth aspect of the present invention, the spray includes a spray member that sprays the supplied raw material liquid in a predetermined spray direction, and a turning member that turns the spray direction of the raw material liquid vertically downward. There is provided a spraying device comprising a panel and a rotating unit connected to the spraying board and rotating the spraying board at a predetermined rotational speed.

According to a seventh aspect of the present invention, in the sixth aspect, the spray member is connected to the upper rotary plate having an opening in the center and the upper rotary plate, and is connected to the upper rotary plate. A pin-type spray mechanism including a lower rotating plate having a parallel plane, and the turning member has an edge portion extending vertically downward from the plane of the lower rotating plate. A spraying device is provided.

According to an eighth aspect of the present invention, in the seventh aspect, the lower rotary plate is formed in a disc shape, and the edge portion is formed as an inclined surface extending in an annular shape from a flat outer edge portion. A spraying device is provided.

Further, according to the ninth aspect of the present invention, there is provided the spray apparatus according to the eighth aspect, wherein the inclined surface has an inclination of 5 ° to 90 ° with respect to the plane.

According to a tenth aspect of the present invention, in the sixth aspect of the invention, there is provided the spraying device, wherein the spraying member includes any one of a Kessner type, a vane type, and a slit vane type spraying mechanism. Provided.

According to an eleventh aspect of the present invention, the spray includes a spray member that sprays the supplied raw material liquid in a predetermined spray direction, and a diverting member that turns the spray direction of the raw material liquid vertically downward. A platen, a rotating unit connected to the spraying plate and rotating the spraying plate at a predetermined number of revolutions, and a raw material liquid supply unit for supplying the raw material liquid into the spraying plate through the opening of the upper rotating plate And a powder generation unit that generates a dry powder by drying the raw material liquid sprayed from the spray board.

According to a twelfth aspect of the present invention, in the eleventh aspect, the spray member is connected to the upper rotary plate having an opening in the center and the upper rotary plate, and is connected to the upper rotary plate. A pin-type spray mechanism including a lower rotating plate having a parallel plane, and the turning member has an edge portion extending vertically downward from the plane of the lower rotating plate. A spray drying apparatus is provided.

According to a thirteenth aspect of the present invention, in the twelfth aspect, the lower rotary plate is formed in a disc shape, and the edge portion is formed as an inclined surface extending in an annular shape from the outer edge portion of the plane. A spray drying apparatus is provided.

Also, according to the fourteenth aspect of the present invention, there is provided the spray drying device according to the thirteenth aspect, wherein the inclined surface has an inclination of 5 ° to 90 ° with respect to the plane.

According to a fifteenth aspect of the present invention, in the eleventh aspect, the spray member comprises a Kessner type, vane type, or slit vane type spray mechanism. Is provided.

According to the present invention, the spraying plate that can be appropriately introduced in the lower part of the drying unit on the vertically downward side without adhering the sprayed raw material liquid to the drying unit inner side wall, the spraying device using the spraying plate, And the spray-drying apparatus using the said spraying apparatus can be provided.

It is a schematic block diagram explaining the apparatus structure of the spray-drying apparatus 50 which concerns on this embodiment. It is a schematic block diagram explaining the apparatus structure of the spraying apparatus 20 which concerns on this embodiment. It is an expanded sectional view of the spray board 10 which concerns on this embodiment in FIG. It is a top view of spraying board 10 concerning this embodiment. It is the figure which graphed the particle size distribution of the dry powder obtained by the test. It is a figure explaining the modification which concerns on this invention. It is a figure explaining the modification which concerns on this invention. It is a figure explaining the modification which concerns on this invention. It is a figure explaining the modification which concerns on this invention. It is a figure explaining the modification which concerns on this invention. It is a figure explaining the modification which concerns on this invention. It is a figure explaining the conventional spraying board.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited to the following description, In the range which does not deviate from the summary of this invention, it can change suitably. In the description of the present invention, members that can have the same configuration may be denoted by the same reference numerals and description thereof may be omitted.

FIG. 1 is a schematic configuration diagram illustrating a device configuration of a spray drying apparatus 50 according to the present embodiment. The spray drying apparatus 50 according to the present embodiment is an apparatus capable of obtaining a fine powdery dry powder by drying a raw material liquid such as a sprayed solution or slurry. Such a spray drying apparatus 50 includes a spray drying chamber 500 as a powder generation unit that generates a dry powder by drying the sprayed raw material liquid, and a spray board 10 having a raw material in the spray drying chamber 500. A spray device 20 for spraying a liquid, a raw material liquid supply unit 30 for supplying a raw material liquid to the spray device 20, a high temperature gas supply unit 40 for supplying a high temperature gas into the spray drying chamber 500, and a lower portion of the spray drying chamber 500 And a first dry powder recovery unit 502 that recovers the dry powder dried in the spray drying chamber 500.

The spray drying chamber 500 is a container for promoting drying by bringing a raw material liquid such as a solution or slurry sprayed by the spraying device 20 into contact with a high-temperature gas such as hot air. The spray-drying chamber 500 can be formed of a steel material such as stainless steel, for example, and can be formed as a substantially cylindrical hollow body that decreases in a conical shape downward. The dry powder obtained by drying by contact with the high-temperature gas is collected by a first dry powder collection unit 502 provided in the lower part of the spray drying chamber 500 by its own weight. For the first dry powder recovery unit 502, for example, various recovery means such as a cone-shaped or quadrangular pyramid hopper, a tray, and a bag body can be applied, such as a ferrule, a band, a clamp, and a flange. If it can be detachably connected to the spray drying chamber 500 via the connecting means, there is no limitation on the type and use thereof. Further, the dry powder may be transported to a storage facility such as a silo by some means such as a screw feeder or pneumatic transportation.

By the way, an impact and vibration are applied to the outer wall of the spray-drying chamber 500 to forcibly flow the dry powder deposited or attached to the side wall and conical portion on the side of the dry chamber, and then lead to the first dry powder recovery unit 502. An impact / vibration applying means 504 such as the above may be provided. In addition, a means for removing dry powder deposited or attached to the wall surface by an air flow such as an air bloom 514 or an air sweeper may be provided. Further, a cyclone type or bag filter type dust collector 510 may be provided in the exhaust pipe 508 for exhausting the high-temperature gas introduced into the spray drying chamber 500. As a result, the dry powder having a small particle size and easily mixed into the exhaust stream is collected by the dust collector 510, and the second drying connected to the dust collector 510 is the same as the first dry powder recovery unit 502. The powder can be collected in the powder collecting unit 512. In addition, it is not always necessary to provide the first dry powder recovery unit 502, the second dry powder recovery unit 512, and two or more collection units, the particle size of most powders is small, the specific gravity is low, etc. In the case of powder characteristics that do not easily drop due to its own weight in the first dry powder recovery unit 502 at the bottom of the spray drying chamber 500, the exhaust pipe 508 is provided from the installation location of the first dry powder recovery unit 502 to thereby perform the second drying. It may be a mechanism that collects all powder in the powder collecting unit 512.

In the raw material liquid supply unit 30, a raw material liquid tank 300 that stores the raw material liquid and a pump 302 are connected by a raw material liquid supply pipe 304. The raw material liquid supply pipe 304 is connected to the raw material liquid supply pipe 200 of the spraying device 20, and the raw material liquid stored in the raw material liquid tank 300 is supplied to the spray board 10 of the spraying device 20 by driving the pump 302. . In addition, as the raw material liquid according to the present invention, various raw materials in the fields of foodstuffs, pharmaceuticals, metal materials, industrial materials, etc. can be used. For example, silicon carbide, silicon nitride, aluminum nitride, zirconia, alumina, Disperse so-called fine ceramic raw materials such as mullite, ferrite, forsterite, barium titanate, lead zirconate titanate, steatite, zircon, ceramic materials such as glass and cement in a suitable solvent to form a slurry. Can be used as a raw material liquid.

The high-temperature gas supply unit 40 includes a gas generator 400 and a gas supply pipe 402, and a gas supply formed in the periphery of the spray device 20, for example, a high-temperature gas such as hot air generated in the gas generator 400. It is supplied into the spray drying chamber 500 through the port 404.

FIG. 2 is a schematic configuration diagram illustrating a device configuration of the spray device 20 according to the present embodiment. The spray device 20 sprays the raw material liquid into the spray drying chamber 500 by the centrifugal force accompanying the high-speed rotation of the spray board 10. The spraying device 20 is connected to the motor 202 via the raw material liquid supply pipe 200 that supplies the raw material liquid to the spraying plate 10, the motor 202, and the coupling 204, and rotates with the rotation of the motor 202. An upper shaft support portion 208 and a lower shaft support portion 210 that support a rotating shaft 206 extending downward in the vertical direction are provided via a bearing (not shown). The rotating shaft 206, the raw material liquid supply pipe 200, the upper shaft support portion 208 and the lower shaft support portion 210 are housed in a casing 212, and a handle 214 for catching the entire spray device 20 is provided on the casing 212. It has been.

The spraying device 20 having the above-described configuration is provided at the approximate center of the top surface 506 of the spray drying chamber 500 and supplies the raw material liquid via the raw material liquid supply pipe 200 connected to the raw material liquid supply pipe 304 while rotating the rotating shaft 206. The spray liquid 10 is sprayed radially outward (in the direction of arrow X in the figure) by rotating the spray disc 10 attached to the tip via a cap nut 216 at high speed. At this time, since the lower rotating plate 106 of the spraying plate 10 described later has an edge portion 116 extending vertically downward from the flat surface portion 108, the raw material liquid sprayed in the direction of the arrow X in the figure is Coanda. Due to the effect, the jet direction is bent in the direction of arrow Y in the figure on the vertically downward side. As a result, the droplet sprayed from the spray board 10 has a sufficiently long reaching distance to the spray drying chamber 500, so that a sufficient drying time and distance are secured. Without being attached to the inner side wall of 500, the spray drying chamber 500 can be appropriately introduced toward the bottom. The raw material liquid in which the spraying direction is bent is dried while evaporating the solvent by contact with the high-temperature gas, and most of the raw material liquid is recovered as a dry powder in the first dry powder recovery unit 502, and a part thereof is the second dry body. It is collected in the collection unit 512.

Next, the structure of the spray board 10 which concerns on this embodiment is demonstrated using FIG.3 and FIG.4. FIG. 3 is an enlarged cross-sectional view of the spray board 10, and FIG. 4 is a plan view of the spray board 10. In the description of the present embodiment, a so-called pin type is sprayed in which a raw material liquid is sprayed by rotating a rotating body in which two rotating plates having a disc (disk) shape are combined through pins. The spray member provided as a mechanism part shall be demonstrated.

The spray platen 10 is arranged in parallel with the upper rotary plate 100 located on the spray device 20 side when mounted perpendicular to the rotary shaft 206 and the upper rotary plate 100 by a plurality of pins 118. And a lower rotating plate 106 connected thereto. A rotating shaft connecting portion 110 is provided at the central portion of the lower rotating plate 106 so as to stand upright from the flat surface portion 108, and the inside thereof is screwed with the cap nut 216 while the rotating shaft 206 is inserted. A nut portion 112 is formed so as to be able to be combined. That is, the lower rotary plate 106 and the rotary shaft 206 are fastened by the cap nut 216 at the nut portion 112, so that the rotary body composed of the upper rotary plate 100 and the lower rotary plate 106 and the rotary shaft 206 are integrated. Will rotate.

The upper rotating plate 100 is configured as an annular disk body having an annular portion 102 formed so that the center portion becomes the opening portion 104, and the raw material liquid supply pipe 200 is inserted into the opening portion 104. The pins 118 are configured as metal rods, and are arranged concentrically at equiangular intervals along the peripheral edge of the annular portion 102 of the upper rotating plate 100 as shown in FIG. When connecting the upper rotary plate 100 and the lower rotary plate 106, pins 118 are arranged at the respective positions of the upper rotary plate 100 and the lower rotary plate 106, and then screwed with a flat head screw 120. The rotating plate 100 and the lower rotating plate 106 can be connected. FIG. 4 shows an example in which a total of 16 pins 118 are used. However, the number of pins 118 is not limited to this, and the upper rotating plate 100 and the lower rotating plate 106 are connected and rotating. There is no limit to the number of cables that can be used unless a problem such as loosening occurs.

The lower rotating plate 106 is configured as a disc body having a flat surface portion 108 parallel to the annular portion 102 of the upper rotating plate 100, and the turning extends from the outer edge portion 114 of the flat surface portion 108 to the vertically downward side. It has the edge part 116 as a member. That is, as shown in FIG. 3, the edge portion 116 is formed as an inclined surface projecting in an annular shape over the entire outer edge portion 114 of the flat portion 108. As an inclination angle θ1 of the edge part 116 with respect to the flat part 108, FIG. 3 shows an example of θ1 = 45 °. The inclination angle is the rotation of the spray platen 10 such as the viscosity of the raw material liquid, the specific gravity and the vapor pressure. The optimum inclination angle varies depending on various conditions such as the speed, hot air temperature, high-temperature gas amount, the distance between the spraying device main body and the spraying plate, etc., and therefore it is preferable to select appropriately within the range of 5 ° to 90 °. The outer diameter S (111 mm in this embodiment) including the tip of the edge portion 116 of the lower rotating plate 106 is substantially the same as the outer diameter T (110 mm in this embodiment) of the upper rotating plate 100. Although configured, these lengths can be changed as appropriate.

When the raw material liquid is sprayed using the spray plate 10 having the above configuration, the raw material liquid is supplied into the spray plate 10 through the raw material liquid supply pipe 200 inserted through the opening 104 of the upper rotating body 100. The spray platen 10 is rotated at a speed of about 1000 to 60000 rpm. Due to the centrifugal force accompanying the rotation of the spray disc 10, the raw material liquid supplied into the disc flows from the flat portion 108 of the lower rotary plate 106 toward the outer edge 114, which is the direction of the arrow X in FIG. The jet flow that has reached the outer edge portion 114 is bent by the edge portion 116 extending from the outer edge portion 114 in the vertical downward direction, the direction of which is the arrow Y direction in FIG. Thereby, without causing the sprayed raw material liquid to fly in the horizontal direction closest to the inner side wall of the spray drying chamber 500, a sufficient drying time and distance are secured, so that the raw material liquid is not attached to the inner side wall, It can be appropriately introduced toward the bottom of the spray drying chamber 500. The raw material liquid in which the spraying direction is bent is dried while evaporating the solvent by contact with the high-temperature gas, and most of the raw material liquid is recovered as a dry powder in the first dry powder recovery unit 502, and a part thereof is the second dry body. It is collected in the collection unit 512.

[Example]
In order to confirm the effect of the spray board 10 according to the present embodiment, each of the conventional spray boards 900 shown in FIG. 12 is mounted on a spray drying apparatus having substantially the same configuration as the spray drying apparatus 50 according to the present embodiment. The test which obtains dry powder from raw material liquids, such as a slurry, was done.

This test was conducted under the conditions shown in Table 1, and an aqueous dextrin solution was used as a raw material solution. The yield is calculated from the total yield of the dry powder collected in the first dry powder recovery unit 502 provided immediately below the spray drying chamber 500 and the second dry powder recovery unit 512 provided directly below the dust collector 510. The particle size distribution of the dry powder obtained at the same time was also measured.

As is apparent from Table 1, when the spray plate 10 according to this embodiment is used, the yield is 86.7%, and the yield when the conventional spray plate 900 is used (69.4%). The result was greatly exceeded. As described above, when the spray board 10 according to the present embodiment is used, the sprayed raw material liquid is bent in the vertically downward direction by the Coanda effect. As a result, the sprayed raw material liquid could be appropriately introduced in the lower direction of the spray drying chamber 500 without adhering to the inner side wall of the spray drying chamber 500, so that the amount of dry powder recovered was improved. It is done.

FIG. 5 is a graph showing the particle size distribution of the dry powder obtained in this test. When the spray plate 10 according to the present embodiment is used, as shown by the solid line in FIG. 5, a very sharp particle size distribution is obtained, and the dry powder obtained when the conventional spray plate 900 is used. It was larger than the cumulative 50% particle size of the body (72.8 μm) and was 82.9 μm. The particle size distribution in the case of using the spray platen 10 is a graph having a sharp shape with a large particle size compared to that of the spray platen 900, so that large droplets are introduced toward the lower part of the spray drying chamber 500. Since a sufficient reach distance and time to dry up to the inner side wall were given, the particles were collected as large particles by the first dry powder collecting unit 502, and the yield was high. In contrast, when the spray disc 900 is used, many spray droplets fly in the horizontal direction, and large droplets reach the inner side wall without giving the distance and time necessary for sufficient drying. Therefore, it is assumed that the yield is low and the cumulative 50% particle size value is also small.

[Modification]
In the description of the spray disc according to the embodiment of the present invention, the spray disc 10 having the edge portion 116 inclined at a predetermined inclination angle as the turning member as the turning member has been described. However, the spray board according to the present invention is not limited to the above configuration. For example, as in the spray disc 60 shown in FIG. 6, the inclined pieces of the edge portion 103 as a turning member projecting in an annular shape over the entire outer edge portion 114 of the lower rotary plate 101 are the first inclined piece 103 a and the second inclined piece 103 a. You may make it incline in multiple steps, such as 2 steps | paragraphs and 3 steps | paragraphs like the inclination piece 103b. In this case, the inclination angle θ2 of the first inclined piece 103a and the inclination angle θ3 of the second inclined piece 103b may be configured to be the same angle, but from the relationship of inclination angle θ2> inclination angle θ3, that is, from an obtuse angle It is preferable to configure so as to have an acute angle in order. Further, for example, as in the spray plate 70 shown in FIG. 7, the tip portion of the inclined piece of the edge portion 107 as a turning member that projects in an annular shape over the entire outer edge portion 114 of the lower rotating plate 105 is directed vertically downward. It may be formed in a curved shape so that

In the description of the spraying plate according to the embodiment of the present invention, the outer diameter S including the tip of the edge portion 116 of the lower rotating plate 106 and the outer diameter T of the upper rotating plate 100 are substantially the same length. Although the spray board 10 configured has been described, the present invention is not limited thereto. For example, as illustrated in FIG. 8, the outer diameter S ′ including the tip end portion of the edge 111 of the lower rotating plate 109 is In other words, the inclined piece of the edge portion 111 can be configured to be longer than the inclined piece of the edge portion 116 of the spray disc 10. By increasing the length of the inclined piece of the edge portion 111 as the turning member, the attracting effect of the raw material liquid accompanying the Coanda effect is increased, and the jet direction of the raw material liquid is more efficiently turned downward vertically. Can be expected.

Further, like the spray platen 90 shown in FIG. 9, the collision guide portion 115 that guides the sprayed raw material liquid to the vertically downward side by colliding with the sprayed raw material liquid has a predetermined inclination like the edge portion 116 of the lower rotating plate 106. It is also possible to configure as an inclined surface having a corner. The collision guide portion 115 can be formed as an inclined surface projecting in an annular shape over the entire outer edge portion 113 of the annular portion 102 of the upper rotating plate 117, and the Coanda effect by the edge portion 116 of the lower rotating plate 106 can be obtained. It is preferable that the inclined surface of the collision guide portion 115 has an inclination angle shallower than that of the edge portion 116 or that the inclined piece is shorter than that of the edge portion 116 so as not to obstruct. Thereby, the raw material liquid can be efficiently guided to the lower rotary plate 106 side without hindering the Coanda effect by the edge portion 116 of the lower rotary plate 106.

In the description of the present invention so far, the spray plate provided with the pin type spray mechanism has been described. However, the present invention is not limited to this, and for example, a Kessner type, a vane type, and a slit vane type are sprayed. Of course, it is also possible to apply to a spray plate as a mechanism.

FIG. 10 is a schematic view for explaining the form of each spray disc provided with a Kessner type (a), vane type (b), and slit vane type (c) spray mechanism to which the present invention is applied. In the description here, in order to facilitate understanding, portions other than the spray mechanism are shown as cross-sectional views.

A spray plate 600 according to FIG. 10A is provided with a rotating plate 608 via a connecting portion 606 with respect to an inverted saddle-shaped Kessner type spray mechanism 602 and extends from the outer edge portion 610 of the rotating plate 608 vertically downward. It is the spray disc in which the edge part 612 as an existing turning member was formed. The edge portion 612 is formed as an inclined surface projecting in an annular shape over the entire outer edge portion 610 of the rotating plate 608. The raw material liquid sprayed from the inner wall 604 of the Kessner spray mechanism 602 has its jet direction bent vertically downward by an edge portion 612 extending from the outer edge portion 610. Thereby, since the sprayed raw material liquid has sufficient drying time and distance, the raw material liquid can be appropriately introduced toward the lower part of the spray drying chamber 500 without adhering the raw material liquid to the inner side wall.

A spray disc 620 according to FIG. 10B includes a disc-shaped vane type spray mechanism 622 formed by connecting an upper rotary plate 626 and a lower rotary plate 628 by a spray wall 630 having a spray port 624. Prepare. The spray disc 620 has an edge portion 634 as a turning member extending vertically downward from the outer edge portion 632 of the lower rotating plate 628. The edge portion 634 is formed as an inclined surface projecting in an annular shape over the entire outer edge portion 632 of the lower rotary plate 628. The raw material liquid sprayed from the spray port 624 of the vane type spray mechanism 622 has its jet direction bent in a vertically downward direction by an edge portion 634 extending from the outer edge portion 632. Thereby, without causing the sprayed raw material liquid to fly in the horizontal direction closest to the inner side wall of the spray drying chamber 500, a sufficient drying time and distance are secured, so that the raw material liquid is not attached to the inner side wall, It can be appropriately introduced toward the bottom of the spray drying chamber 500.

The spray plate 640 according to FIG. 10C is similar to the spray plate 620 shown in FIG. 10B, and the spray wall 650 in which the upper rotary plate 646 and the lower rotary plate 648 have a slit-shaped spray port 644. Are provided with a disk-shaped slit vane type spray mechanism 642 formed by being connected to each other. The spray disc 640 has an edge portion 654 as a turning member extending vertically downward from the outer edge portion 652 of the lower rotating plate 648. The edge portion 654 is formed as an inclined surface projecting in an annular shape over the entire outer edge portion 652 of the lower rotating plate 648. The raw material liquid sprayed from the spray port 644 of the slit vane type spray mechanism 642 is bent in the vertical downward direction by the edge portion 654 extending from the outer edge portion 652. Thereby, without causing the sprayed raw material liquid to fly in the horizontal direction closest to the inner side wall of the spray drying chamber 500, a sufficient drying time and distance are secured, so that the raw material liquid is not attached to the inner side wall, It can be appropriately introduced toward the bottom of the spray drying chamber 500.

Further, for example, in the spraying plate equipped with the above-described Kessner type spraying mechanism, it is possible to change the jet direction of the raw material liquid in the vertically downward direction without separately providing the edge portion described above. Here, FIG. 11A is a cross-sectional view illustrating a cross-sectional shape of a spray board 700 provided with a conventional Kessner spray mechanism, and FIG. 11B includes a Kessner spray mechanism to which the present invention is applied. It is sectional drawing explaining the cross-sectional shape of the spraying board.

11A is configured so that the inner wall 704 and the outer wall 706 have a thin structure that tapers toward the tip 708. The raw material liquid sprayed from the spraying port 702 is sprayed along the inner wall 704 as the spraying board 700 rotates. On the other hand, in the spray disc 800 shown in FIG. 11B, the heel inner wall 804 and the heel outer wall 806 are formed in a teardrop shape toward the tip 808, that is, the heel outer wall 806 and the tip. The shape of the wall itself is configured as a turning member so that the line connecting the portion 808 has an arc shape (wing shape), so that hot gas such as hot air flowing along the wall 806 is 11 (a Unlike the linear flow indicated by the arrow), it flows into the inner wall 804 side as shown in FIG. The jet direction of the raw material liquid that is sprayed from the spraying port 802 and flows along the inner wall 804 by the high-temperature gas flowing into the inner wall 804 can be turned to the vertically downward side. Thereby, since the sprayed raw material liquid has sufficient drying time and distance, the raw material liquid can be appropriately introduced toward the lower part of the spray drying chamber 500 without adhering the raw material liquid to the inner side wall.

As described above, according to the present invention, a spraying plate capable of appropriately introducing the sprayed raw material liquid to the drying unit lower side wall without adhering to the drying unit inner side wall, and a spraying apparatus using the spraying plate And a spray drying apparatus using the spray apparatus.

The spray drying apparatus according to the present invention has been described with respect to an apparatus that employs a so-called spray dryer method in which a solvent contained in sprayed raw material liquid droplets is evaporated by contact with a high-temperature gas and dried. However, the present invention is not limited to this. For example, the present invention is applied to a spray freeze-dried powder production apparatus in which droplets of a sprayed raw material liquid are condensed and solidified in a low-temperature environment and freeze-dried to obtain a dry powder. It is also possible to apply.

10, 60, 70, 90, 600, 620, 640, 700, 800 ... spraying plate, 20 ... spraying device, 30 ... raw material liquid supply unit, 40 ... high temperature gas supply unit, 50 ... spray drying device, 100, 117, 626, 646 ... upper rotating plate, 102 ... annular portion, 104 ... opening, 115 ... collision guide portion, 101, 106, 109, 628, 648 ... lower rotating plate, 108 ... plane portion, 110 ... rotating shaft connection Part, 112 ... nut part, 103a ... first inclined piece, 103b ... second inclined piece, 113, 114, 610, 632, 652 ... outer edge part, 103, 107, 111, 116, 612, 634, 654 ... edge part , 118 ... pin, 120 ... flat head screw, 200 ... raw material supply pipe, 202 ... motor, 204 ... coupling, 206 ... rotating shaft, 208 ... upper shaft support, 210 ... lower shaft support, 2 2 ... casing, 214 ... handle, 216 ... cap nut, 300 ... raw material liquid tank, 302 ... pump, 304 ... raw material liquid supply pipe, 400 ... gas generator, 402 ... gas supply pipe, 404 ... gas supply port, 500 ... Spray drying chamber, 502 ... first dry powder recovery unit, 504 ... impact / vibration applying means, 506 ... top surface, 508 ... exhaust pipe, 510 ... dust collector, 512 ... second dry powder recovery unit, 514 ... Air bloom, 602 ... Kessner type spray mechanism, 604, 704, 804 ... Inner wall, 606 ... Connection part, 608 ... Rotating plate, 622 ... Vane type spray mechanism, 624, 644, 702, 802 ... Spray port, 630, 650 ... Spray wall, 642 ... Slit vane type spray mechanism, 700, 900 ... Spray board, 706, 806 ... Outer wall, 708, 808 ... Tip

Claims

A spray member for spraying the supplied raw material liquid in a predetermined spray direction;
A spraying board comprising: a turning member that turns the spraying direction of the raw material liquid vertically downward.
The spray member includes a pin-type spray mechanism including an upper rotary plate having an opening at a central portion, and a lower rotary plate connected to the upper rotary plate and having a plane parallel to the upper rotary plate. Prepared,
The spray plate according to claim 1, wherein the turning member has an edge portion extending vertically downward from the plane of the lower rotating plate.
The spray disk according to claim 2, wherein the lower rotating plate is formed in a disc shape, and the edge portion is formed as an inclined surface extending in an annular shape from an outer edge portion of the plane.
4. The spray disc according to claim 3, wherein the inclined surface has an inclination of 5 ° to 90 ° with respect to the plane.
The spraying board according to claim 1, wherein the spraying member includes a spray mechanism of any one of a Kessner type, a vane type, and a slit vane type.
A spraying plate having a spraying member for spraying the supplied raw material liquid in a predetermined spraying direction, and a turning member for turning the spraying direction of the raw material liquid to a vertically downward side;
A spraying device comprising: a rotating unit connected to the spraying plate and rotating the spraying plate at a predetermined number of rotations.
The spray member includes a pin-type spray mechanism including an upper rotary plate having an opening at a central portion, and a lower rotary plate connected to the upper rotary plate and having a plane parallel to the upper rotary plate. Prepared,
The spray device according to claim 6, wherein the turning member has an edge portion extending vertically downward from the plane of the lower rotating plate.
The spray device according to claim 7, wherein the lower rotating plate is formed in a disc shape, and the edge portion is formed as an inclined surface extending in an annular shape from an outer edge portion of the plane.
The spray device according to claim 8, wherein the inclined surface has an inclination of 5 ° to 90 ° with respect to the plane.
The spray device according to claim 6, wherein the spray member includes a spray mechanism of any one of a Kessner type, a vane type, and a slit vane type.
A spraying plate having a spraying member for spraying the supplied raw material liquid in a predetermined spraying direction, and a turning member for turning the spraying direction of the raw material liquid to a vertically downward side;
A rotating unit connected to the spraying plate and rotating the spraying plate at a predetermined rotational speed;
A raw material liquid supply section for supplying a raw material liquid into the spraying plate through the opening of the upper rotating plate;
A spray drying apparatus comprising: a powder generation unit that generates a dry powder by drying the raw material liquid sprayed from the spray board.
The spray member includes a pin-type spray mechanism including an upper rotary plate having an opening at a central portion, and a lower rotary plate connected to the upper rotary plate and having a plane parallel to the upper rotary plate. Prepared,
The spray drying apparatus according to claim 11, wherein the turning member has an edge portion extending vertically downward from the plane of the lower rotating plate.
The spray drying apparatus according to claim 12, wherein the lower rotary plate is formed in a disc shape, and the edge portion is formed as an inclined surface extending in an annular shape from an outer edge portion of the plane.
14. The spray drying apparatus according to claim 13, wherein the inclined surface has an inclination of 5 ° to 90 ° with respect to the plane.
The spray drying apparatus according to claim 11, wherein the spray member includes a spray mechanism of any one of a Kessner type, a vane type, and a slit vane type.