JP7007759B2 - Sprayer, sprayer, and spray dryer - Google Patents

Description

The present invention is a spraying machine used for producing a dry powder by drying a sprayed solution, a raw material liquid such as a slurry, a spraying device using the spraying machine, and a spray drying device using the spraying device. It is about.

Spray-drying devices that produce dry powders (granule) by drying raw materials such as sprayed solutions and slurries with hot air are used in the fields of manufacturing foods, pharmaceuticals, metal materials, industrial materials, and the like. It is often used. A general spray-drying device evaporates the solvent contained in the raw material liquid by bringing hot air or the like into contact with the sprayed part that sprays the raw material liquid such as a solution or slurry at least. It is provided with a drying unit for producing a dry powder.

In a normal parallel flow type spray drying device, a spraying portion is provided in a substantially central portion of the top surface of the drying portion, and the raw material liquid sprayed by the spraying portion is in contact with a high temperature gas (for example, hot air). With the evaporation of the solvent, it naturally falls to the lower part of the dry part and is recovered as a dry powder. At this time, the dry powder having a small particle size and easily mixed in the exhaust flow can be recovered together with the exhaust of the high temperature gas by a cyclone type dust collector or the like provided together with the exhaust means.

A rotating disk, a pressurized nozzle, a two-fluid nozzle, or the like is used as the spraying part. Among them, a rotating disk is used because a dry powder having a sharp viscosity distribution can be obtained and the particle size can be easily controlled. Is often selected. There are various disc shapes such as vane type, pin type, and Kesner (bell) type for the rotating disc, and they are appropriately used according to the intended use, environment, and the like (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2002-128570

The rotating disk is also generally called a spraying disk, and among them, the pin type is configured as a rotating body in which two rotating plates having a disk (disk) shape are combined. The rotating disk rotates at a high speed of about 1000 to 60,000 rpm by the driving force transmitted via the axis of rotation, and sprays the supplied raw material liquid such as a solution or slurry by the centrifugal force. However, the conventional rotary disk sprays the raw material liquid in the direction of arrow A, which is horizontal to the rotation axis, like the rotary disk (spraying machine 900) illustrated in FIG. 12, so that the rotation speed is low. In some cases, such as when large droplets are sprayed, the specific gravity of the raw material liquid is large, and the flight distance is long, the raw material liquid is not sufficiently dried, so the raw material liquid is applied to the inner side wall of the dried portion. Since it comes into contact with each other in an undried or semi-dried state and adheres to a large amount, it cannot be recovered as a dry powder, and there is a problem that the yield is lowered. Further, when the rotation speed of the spray by the rotating disk becomes higher, the jet flow spreads upward, the raw material liquid adheres to the top surface side of the dried portion, and the yield decreases, and the raw material liquid is applied to the upper rotating plate of the rotating disk. There is also a problem that the weight balance of the rotating disk is lost due to the adhesion, the proper spraying cannot be performed, and 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 high speed, and 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 that it will be done. It is suggested that such a flow of air acting in the direction opposite to the normal spraying direction may be a factor that hinders the backflow of the raw material liquid or the flow of the raw material liquid inside the rotating disk.

The present invention has been made in view of such an actual situation, and the subject of the present invention is to appropriately introduce the sprayed raw material liquid toward the lower part of the dry portion on the vertically downward side without adhering to the inner side wall of the dry portion. It is an object of the present invention to provide a spraying machine capable of using the spraying machine, a spraying device using the spraying machine, and a spray drying device using the spraying device.

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

That is, according to the first aspect of the present invention, a spray 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 vertically downward are provided. The spray member includes an upper rotary plate having an opening in the center and a lower rotary plate connected to the upper rotary plate and having a plane parallel to the upper rotary plate . Provided is a spraying machine characterized by having an edge portion extending vertically downward from the plane of the lower rotating plate.

Further, in the first invention, the lower rotating plate is formed in a disk 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 board can be provided, the inclined surface can have an inclination of 5 ° to 90 ° with respect to the plane .

Further , according to the second aspect of the present invention, a spray having a spray member for spraying the supplied raw material liquid in a predetermined spray direction and a turning member for turning the spray direction of the raw material liquid vertically downward. The board is provided with a rotating portion connected to the spraying machine and rotating the spraying machine at a predetermined rotation speed, and the spraying member is connected to an upper rotating plate having an opening in a central portion and the upper rotating plate. The turning member includes an lower rotating plate having a plane parallel to the upper rotating plate, and the turning member has an edge portion extending vertically downward from the plane of the lower rotating plate. A spraying device is provided.

Further, in the second invention, the lower rotating plate is formed in a disk shape, and the edge portion is formed as an inclined surface extending in an annular shape from the outer edge portion of the plane. The device can be provided and the inclined surface can have an inclination of 5 ° to 90 ° with respect to the plane.

Further , according to the third aspect of the present invention, a spray having a spray member for spraying the supplied raw material liquid in a predetermined spray direction and a turning member for turning the spray direction of the raw material liquid vertically downward. A raw material liquid supply unit that is connected to the spraying machine, a rotating portion that rotates the spraying machine at a predetermined rotation speed, and a raw material liquid supply unit that supplies the raw material liquid to the inside of the spraying machine through the opening of the upper rotating plate. And a powder generating unit that produces dry powder by drying the raw material liquid sprayed from the spraying machine, the spray member includes an upper rotary plate having an opening in the center and the upper side. The turning member includes an lower rotating plate which is connected to the rotating plate and has a plane parallel to the upper rotating plate, and the turning member has an edge portion extending vertically downward from the plane of the lower rotating plate. It is possible to provide a spray drying device characterized by having .

Further, in the third aspect of the present invention, the lower rotating plate is formed in a disk shape, and the edge portion is formed as an inclined surface extending in an annular shape from the outer edge portion of the plane. The spray drying device can be provided, and the inclined surface can have an inclination of 5 ° to 90 ° with respect to the plane.

According to the present invention, a spraying machine capable of appropriately introducing the sprayed raw material liquid toward the lower part of the drying part on the vertically downward side without adhering to the inner side wall of the drying part, a spraying device using the spraying machine, and the like. And a spray drying device using the spraying device can be provided.

It is a schematic block diagram explaining the apparatus configuration of the spray drying apparatus 50 which concerns on this embodiment. It is a schematic block diagram explaining the apparatus configuration of the spraying apparatus 20 which concerns on this embodiment. FIG. 2 is an enlarged cross-sectional view of the spraying machine 10 according to the present embodiment in FIG. It is a top view of the spray board 10 which concerns on this embodiment. It is a figure which graphed the particle size distribution of the dry powder obtained in a 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 machine 900.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the following description, and can be appropriately modified without departing from the gist of the present invention. Further, in the description of the present invention, the members having the same configuration may be designated by the same reference numerals and the description thereof may be omitted.

FIG. 1 is a schematic configuration diagram illustrating an apparatus configuration of the spray drying apparatus 50 according to the present embodiment. The spray drying device 50 according to the present embodiment is a device capable of obtaining a dry powder in the form of fine particles by drying a raw material liquid such as a sprayed solution or a slurry. Such a spray drying device 50 has a spray drying chamber 500 as a powder generating unit for producing dry powder by drying the sprayed raw material liquid, and a spraying board 10 and raw materials inside the spray drying chamber 500. A spray device 20 for spraying the liquid, a raw material liquid supply unit 30 for supplying the raw material liquid to the spray device 20, a high temperature gas supply unit 40 for supplying high temperature gas in the spray drying chamber 500, and a lower portion of the spray drying chamber 500 are provided. It is provided with a first dry powder recovery unit 502 for recovering the dry powder dried in the spray drying chamber 500.

The spray drying chamber 500 is a container for promoting drying by contacting a raw material liquid such as a solution or slurry sprayed by the spray device 20 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, and can be formed as a substantially cylindrical hollow body whose diameter is reduced downward in a conical shape. The dry powder obtained by drying by contact with the high temperature gas is recovered by its own weight in the first dry powder recovery unit 502 provided in the lower part of the spray drying chamber 500. Various recovery means such as a conical or square pyramid-shaped hopper, a tray, and a bag can be applied to the first dry powder recovery unit 502, such as a ferrule, a band, a clamp, and a flange. As long as it can be detachably connected to the spray drying chamber 500 via the connecting means, there are no restrictions on its type and use. Further, the dry powder may be transported to a storage facility such as a silo by some means such as a screw feeder or air transport.

By the way, by applying impact and vibration to the outer wall of the spray drying chamber 500, the dry powder deposited or adhered to the side wall surface and the conical portion of the drying chamber is forcibly flowed and guided to the first dry powder recovery unit 502, a knocker and a vibrator. The impact / vibration applying means 504 such as the above may be provided. Further, a means for removing dry powder accumulated or adhering 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 in the exhaust stream is collected by the dust collector 510, and is connected to the dust collector 510 in the same manner as the first dry powder recovery unit 502. It can be recovered in the powder recovery section 512. Further, 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, and most of the powder has a small particle size, a low specific gravity, and the like. In the case of powder characteristics that are difficult to drop due to its own weight in the first dry powder recovery unit 502 at the bottom of the spray drying chamber 500, the second drying is performed by providing an exhaust pipe 508 from the installation location of the first dry powder recovery unit 502. A mechanism may be used in which the powder recovery unit 512 recovers all the powder.

In the raw material liquid supply unit 30, the raw material liquid tank 300 for accommodating the raw material liquid and the 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 contained in the raw material liquid tank 300 is supplied to the spraying board 10 of the spraying device 20 by driving the pump 302. .. As the raw material liquid according to the present invention, various raw materials in the fields of foodstuffs, pharmaceuticals, metal materials, industrial materials and the like can be used. For example, silicon carbide, silicon nitride, aluminum nitride, zirconia, alumina, etc. So-called fine ceramic raw materials such as mulite, ferrite, forsterite, barium titanate, lead titanate zirconate, steatite, and zircon, and ceramic raw materials such as glass and cement are dispersed in an appropriate solvent to form a slurry. Can be used as a raw material liquid.

The high temperature gas supply unit 40 is composed of a gas generator 400 and a gas supply pipe 402, and supplies high temperature gas such as hot air generated in the gas generator 400 around the spray device 20. It is supplied to the inside of the spray drying chamber 500 through the mouth 404.

FIG. 2 is a schematic configuration diagram illustrating an apparatus configuration of the spray apparatus 20 according to the present embodiment. The spraying device 20 sprays the raw material liquid into the spray drying chamber 500 by the centrifugal force accompanying the high-speed rotation of the spraying machine 10. The spraying device 20 includes a raw material liquid supply pipe 200 for supplying the raw material liquid to the spraying board 10, a motor 202, a rotating shaft 206 connected to the motor 202 via a coupling 204, and rotating with the drive of the motor 202. An upper shaft branch 208 and a lower shaft branch 210 that pivotally support the rotating shaft 206 extending downward in the vertical direction are provided via a bearing (not shown) or the like. The rotary shaft 206, the raw material liquid supply pipe 200, the upper shaft branch 208, and the lower shaft branch 210 are housed in the casing 212, and a handle 214 for stopping the entire spraying device 20 is provided on the upper part of the casing 212. Has been done.

The spray device 20 having the above configuration is provided at substantially the center of the top surface 506 of the spray drying chamber 500, and supplies the raw material liquid through the raw material liquid supply pipe 200 connected to the raw material liquid supply pipe 304, while supplying the raw material liquid to the rotating shaft 206. By rotating the spraying machine 10 attached to the tip via the cap nut 216 at high speed, the raw material liquid is sprayed outward in the radial direction (in the direction of arrow X in the figure). At this time, since the lower rotary plate 106 of the spray 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 arrow X in the figure is a Coanda. Due to the effect, the jet direction is bent in the direction of the arrow Y in the figure on the vertically downward side. As a result, the droplets sprayed from the spraying board 10 have a significantly longer reach to the spray drying chamber 500, so that a sufficient drying time and distance are secured. Therefore, the sprayed raw material liquid is sprayed into the spray drying chamber. It can be appropriately introduced toward the lower part of the spray drying chamber 500 without adhering to the inner side wall of the 500. The raw material liquid whose spray direction is bent is dried while evaporating the solvent by contact with the high temperature gas, and most of it is recovered as a dry powder in the first dry powder recovery unit 502, and a part of it is a second dry body. It will be collected in the collection unit 512.

Next, the configuration of the spraying machine 10 according to the present embodiment will be described with reference to FIGS. 3 and 4. FIG. 3 is an enlarged cross-sectional view of the spraying machine 10, and FIG. 4 is a plan view of the spraying machine 10. In the description of the present embodiment, a so-called pin type is sprayed by spraying a raw material liquid by rotating a rotating body in which two rotating plates having a disk (disk) shape are combined via a pin at high speed. The spray member provided as a mechanical part shall be described.

The spray plate 10 is arranged in parallel with the upper rotary plate 100 located on the spray device 20 side when mounted orthogonally to the rotary shaft 206, and the upper rotary plate 100 by a plurality of pins 118. It is provided with a connected lower rotating plate 106. A rotating shaft connecting portion 110 is provided in 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 with the rotating shaft 206 inserted. The nut portion 112 is formed so as to enable fitting. That is, by fastening the lower rotating plate 106 and the rotating shaft 206 with the cap nut 216 in the nut portion 112, the rotating body composed of the upper rotating plate 100 and the lower rotating plate 106 and the rotating shaft 206 are integrated. Will rotate to.

The upper rotary plate 100 is configured as an annular disk body having an annular portion 102 formed so that the central portion is an opening 104, and the raw material liquid supply pipe 200 is inserted through the opening 104. The pins 118 are configured as metal rods, and as shown in FIG. 4, are arranged concentrically at equal intervals along the peripheral edge of the annular portion 102 of the upper rotary plate 100. When connecting the upper rotary plate 100 and the lower rotary plate 106, the pins 118 are placed at the respective arrangement positions of the upper rotary plate 100 and the lower rotary plate 106, and then screwed with the countersunk screw 120 to be screwed on the upper side. The rotary plate 100 and the lower rotary plate 106 can be connected. Although FIG. 4 shows an example in which a total of 16 pins 118 are used, 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 pieces that can be used unless there is a problem such as loosening.

The lower rotary plate 106 is configured as a disk body having a flat surface portion 108 parallel to the annular portion 102 of the upper rotary plate 100, and is rotated vertically downward from the outer edge portion 114 of the flat surface portion 108. It has an edge portion 116 as a member. That is, as shown in FIG. 3, the edge portion 116 is formed as an inclined surface that projects in an annular shape over the entire outer edge portion 114 of the flat surface portion 108. As the inclination angle θ1 of the edge portion 116 with respect to the flat surface portion 108, an example of θ1 = 45 ° is shown in FIG. Since the optimum tilt angle varies depending on various conditions such as speed, hot air temperature, amount of high-temperature gas, distance between the spraying device main body and the spraying board, it is preferable to appropriately select the tilt angle in the range of 5 ° to 90 °. The outer diameter S (111 mm in the present embodiment) including the tip of the edge portion 116 of the lower rotary plate 106 has substantially the same length as the outer diameter T (110 mm in the present embodiment) of the upper rotary plate 100. Although it is configured, these lengths can be changed as appropriate.

When the raw material liquid is sprayed using the spraying machine 10 having the above configuration, the raw material liquid is supplied to the inside of the spraying machine 10 through the raw material liquid supply pipe 200 inserted through the opening 104 of the upper rotating body 100. The atomizer 10 is rotated at a speed of about 1000 to 60,000 rpm. The raw material liquid supplied to the inside of the plate by the centrifugal force accompanying the rotation of the spray plate 10 flows from the flat surface portion 108 of the lower rotating plate 106 toward the outer edge portion 114, which is the direction of the arrow X in FIG. The jet that reaches the outer edge portion 114 is bent by the edge portion 116 extending from the outer edge portion 114 in the vertical downward side direction in which the jet direction is the Y direction of the arrow in FIG. As a result, a sufficient drying time and distance are secured without causing the sprayed raw material liquid to fly in the shortest horizontal direction on the inner side wall of the spray drying chamber 500, so that the raw material liquid does not adhere to the inner side wall. It can be appropriately introduced toward the lower part of the spray drying chamber 500. The raw material liquid whose spray direction is bent is dried while evaporating the solvent by contact with the high temperature gas, and most of it is recovered as a dry powder in the first dry powder recovery unit 502, and a part of it is a second dry body. It will be collected in the collection unit 512.

[Example]
In order to confirm the effect of the spraying machine 10 according to the present embodiment, each of the conventional spraying machines 900 shown in FIG. 12 is attached to a spray drying device having substantially the same configuration as the spray drying device 50 according to the present embodiment, and a solution is provided. , A test was conducted to obtain a dry powder from a raw material solution such as a slurry.

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

As is clear from Table 1, when the spraying machine 10 according to the present embodiment is used, the yield is 86.7%, and the yield when the conventional spraying machine 900 is used (69.4%). The result was much higher than that. This is because, as described above, when the spraying machine 10 according to the present embodiment is used, the jet direction of the sprayed raw material liquid is bent vertically downward due to the Coanda effect. As a result, the sprayed raw material liquid could be appropriately introduced toward the lower part of the spray drying chamber 500 without adhering to the inner side wall of the spray drying chamber 500, and it is considered that the recovery amount of the dried powder was improved. Be done.

FIG. 5 is a graph showing the particle size distribution of the dry powder obtained in this test. When the spraying machine 10 according to the present embodiment is used, as shown by the solid line in FIG. 5, a particle size distribution having a very sharp shape is obtained, and the dry powder obtained when the conventional spraying machine 900 is used. It was 82.9 μm, which was larger than the cumulative 50% particle size (72.8 μm) of the body. Since the particle size distribution when the spraying machine 10 is used is a graph in which the large particle size is sharper than that of the spraying machine 900, large droplets are introduced toward the lower part of the spray drying chamber 500. Then, since sufficient reach and time for drying to the inner side wall were given, the particles were recovered as large particles by the first dry powder recovery unit 502, and the yield was high. On the other hand, when the spray plate 900 is used, many spray droplets fly in the horizontal direction, and the large droplets reach the inner side wall without being given the necessary distance and time for sufficient drying. It is presumed that the yield was low and the cumulative 50% particle size was also small.

[Modification example]
In the description of the spraying machine according to the embodiment of the present invention, the spraying machine 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 spraying machine according to the present invention is not limited to the above configuration. For example, like the spraying machine 60 shown in FIG. 6, the inclined pieces of the edge portion 103 as the turning member projecting in an annular shape over the entire outer edge portion 114 of the lower rotating plate 101 are the first inclined pieces 103a and the second. Like the inclined piece 103b or the like, it may be inclined in a plurality of times such as two steps and three steps. In this case, the tilt angle θ2 of the first tilt piece 103a and the tilt angle θ3 of the second tilt piece 103b may be configured to be the same angle, but from the relationship of the tilt angle θ2> the tilt angle θ3, that is, from the obtuse angle. It is preferable to configure them so that they have sharp angles 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 projecting in an annular shape over the entire outer edge portion 114 of the lower rotating plate 105 is vertically downward. It may be formed in a curved shape so as to be.

Further, in the description of the spraying machine according to the embodiment of the present invention, the outer diameter S including the tip of the edge portion 116 of the lower rotary plate 106 and the outer diameter T of the upper rotary plate 100 are substantially the same length. Although the configured spray plate 10 has been described, the present invention is not limited to this, and for example, as shown in FIG. 8, the outer diameter S'including the tip portion of the edge portion 111 of the lower rotary plate 109 is the upper rotary plate 100. It is also possible to configure the inclined piece of the edge portion 111 to be larger than the outer diameter T, in other words, to be longer than the length of the inclined piece of the edge portion 116 related to the spray plate 10. By increasing the length of the inclined piece of the edge portion 111 as the turning member, the attraction effect of the raw material liquid due to the Coanda effect is increased, and the jet direction of the raw material liquid is more efficiently turned to the vertically downward side. Can be expected to be possible.

Further, like the spraying machine 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 can also be configured as an inclined surface with corners. The collision guide portion 115 can be formed as an inclined surface that projects in an annular shape over the entire outer edge portion 113 of the annular portion 102 of the upper rotary plate 117, and the Coanda effect due to the edge portion 116 of the lower rotary 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 the inclined piece is shorter than that of the edge portion 116 so as not to hinder the collision guide portion 115. As a result, the raw material liquid can be efficiently guided to the lower rotating plate 106 side without disturbing the Coanda effect due to the edge portion 116 of the lower rotating plate 106.

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

FIG. 10 is a schematic view illustrating a form of each spraying machine provided with a Kessner type (a), vane type (b), and slit vane type (c) spraying mechanism to which the present invention is applied. In the description here, for the sake of ease of understanding, the parts other than the spraying mechanism are shown as a cross-sectional view.

In the spraying machine 600 according to FIG. 10A, a rotating plate 608 is provided to the inverted bowl-shaped Kessner-type spraying mechanism 602 via a connecting portion 606, and extends vertically downward from the outer edge portion 610 of the rotating plate 608. It is a spraying machine on which an edge portion 612 as an existing turning member is formed. The edge portion 612 is formed as an inclined surface that projects in an annular shape over the entire outer edge portion 610 of the rotating plate 608. The raw material liquid sprayed from the bowl inner wall 604 of the Kessner-type spraying mechanism 602 is bent in the vertical downward direction by the edge portion 612 extending from the outer edge portion 610. As a result, the sprayed 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 because a sufficient drying time and a sufficient distance are secured.

The spraying machine 620 according to FIG. 10B has a disk-shaped vane-shaped spraying mechanism 622 formed by connecting the upper rotating plate 626 and the lower rotating plate 628 by a spray wall 630 having a spray port 624. Be prepared. The spraying machine 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 that projects in an annular shape over the entire outer edge portion 632 of the lower rotating plate 628. The raw material liquid sprayed from the spray port 624 of the vane-type spray mechanism 622 is bent vertically downward by the edge portion 634 extending from the outer edge portion 632. As a result, a sufficient drying time and distance are secured without causing the sprayed raw material liquid to fly in the shortest horizontal direction on the inner side wall of the spray drying chamber 500, so that the raw material liquid does not adhere to the inner side wall. It can be appropriately introduced toward the lower part of the spray drying chamber 500.

The spray plate 640 according to FIG. 10 (c) has a spray wall 650 in which the upper rotary plate 646 and the lower rotary plate 648 have a slit-shaped spray port 644, similarly to the spray plate 620 shown in FIG. 10 (b). It is provided with a disk-shaped slit vane type spray mechanism 642 formed by being connected by. The spraying machine 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 that projects 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 vertically downward by the edge portion 654 extending from the outer edge portion 652. As a result, a sufficient drying time and distance are secured without causing the sprayed raw material liquid to fly in the shortest horizontal direction on the inner side wall of the spray drying chamber 500, so that the raw material liquid does not adhere to the inner side wall. It can be appropriately introduced toward the lower part of the spray drying chamber 500.

Further, for example, in the spraying machine provided with the above-mentioned Kesner type spraying mechanism, the jet direction of the raw material liquid can be turned vertically downward without separately providing the edge portion and the like described above. Here, FIG. 11A is a cross-sectional view illustrating a cross-sectional shape of a spraying machine 700 provided with a conventional Kesner-type spraying mechanism, and FIG. 11B is provided with a Kesner-type spraying mechanism to which the present invention is applied. It is sectional drawing explaining the sectional shape of the spraying machine 800.

The spraying machine 700 shown in FIG. 11A is configured such that the bowl inner wall 704 and the bowl outer wall 706 have a thin wall structure that tapers toward the tip portion 708. The raw material liquid sprayed from the spray port 702 will be sprayed along the inner wall 704 of the bowl as the spraying machine 700 rotates. On the other hand, in the spray plate 800 shown in FIG. 11B, the bowl inner wall 804 and the bowl outer wall 806 form a teardrop shape toward the tip portion 808, that is, the bowl outer wall 806 and the tip end. Since the shape of the bowl wall itself is configured as a turning member so that the line connecting the portions 808 is arcuate (wing-shaped), the high-temperature gas such as hot air flowing along the bowl outer wall 806 is 11 (a) in the figure. ), The flow is different from the linear flow shown by the arrow of), and flows toward the inner wall 804 side of the bowl as shown in FIG. 11 (b). By the high temperature gas flowing into the bowl inner wall 804 side, the jet direction of the raw material liquid sprayed from the spray port 802 and flowing along the bowl inner wall 804 can be turned vertically downward. As a result, the sprayed 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 because a sufficient drying time and a sufficient distance are secured.

As described above, according to the present invention, a spraying machine capable of appropriately introducing the sprayed raw material liquid toward the lower part of the drying part without adhering to the inner side wall of the drying part, and a spraying device using the spraying machine. , And a spray drying device using the spraying device can be provided.

As the spray drying device according to the present invention, a device adopting a so-called spray dryer method in which the solvent contained in the droplets of the sprayed raw material liquid is evaporated by contact with a high temperature gas and dried is described. Is not limited to this. It is also possible to apply.

10,60,70,90,600,620,640,700,800 ... Sprayer, 20 ... Sprayer, 30 ... Raw material liquid supply unit, 40 ... High temperature gas supply unit, 50 ... Spray dryer, 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 ... flat 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 ... Countersunk screw, 200 ... Raw material liquid supply pipe, 202 ... Motor, 204 ... Coupling, 206 ... Rotating shaft, 208 ... Upper shaft branch, 210 ... Lower shaft branch, 212 ... 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 ... 1st 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 ... Bowl 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 ... Bowl outer wall, 708, 808 ... Tip

Claims (9)

A spraying member that sprays the supplied raw material liquid in a predetermined spraying direction,
A turning member for turning the spraying direction of the raw material liquid vertically downward is provided.
The spray member includes an upper rotary plate having an opening in the center and a lower rotary plate connected to the upper rotary plate and having a plane parallel to the upper rotary plate .
The turning member is a spraying machine characterized by having an edge portion extending vertically downward from the plane of the lower rotating plate. The spray disk according to claim 1 , wherein the lower rotary plate is formed in a disk shape, and the edge portion is formed as an inclined surface extending in an annular shape from the outer edge portion of the plane. The spraying machine according to claim 2 , wherein the inclined surface has an inclination of 5 ° to 90 ° with respect to the plane. A spraying machine 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 vertically downward.
It is provided with a rotating portion connected to the spraying machine and rotating the spraying machine at a predetermined rotation speed.
The spray member includes an upper rotary plate having an opening in the center and a lower rotary plate connected to the upper rotary plate and having a plane parallel to the upper rotary plate.
The turning member is a spraying device having an edge portion extending vertically downward from the plane of the lower rotating plate. The spraying device according to claim 4 , wherein the lower rotating plate is formed in a disk shape, and the edge portion is formed as an inclined surface extending in an annular shape from the outer edge portion of the plane. The spraying device according to claim 5 , wherein the inclined surface has an inclination of 5 ° to 90 ° with respect to the plane. A spraying machine 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 vertically downward.
A rotating part connected to the spraying machine and rotating the spraying machine at a predetermined rotation speed,
A raw material liquid supply unit that supplies the raw material liquid to the inside of the spray plate through the opening of the upper rotary plate, and a raw material liquid supply unit.
It is provided with a powder generating unit that produces dry powder by drying the raw material liquid sprayed from the spraying machine.
The spray member includes an upper rotary plate having an opening in the center and a lower rotary plate connected to the upper rotary plate and having a plane parallel to the upper rotary plate.
The spray drying device is characterized in that 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 7 , wherein the lower rotary plate is formed in a disk shape, and the edge portion is formed as an inclined surface extending in an annular shape from the outer edge portion of the plane. The spray drying device according to claim 8 , wherein the inclined surface has an inclination of 5 ° to 90 ° with respect to the plane.

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