JPWO2020031227A1 - Spray drying device and spray drying method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spray drying device and a spray drying method capable of recovering dry powder with a high recovery rate in a dry powder recovery unit provided in a lower part of a spray drying chamber. SOLUTION: A spraying means for spraying a raw material liquid into a drying chamber, a drying means for drying the raw material liquid by bringing a high-temperature gas into contact with a jet stream from the spraying means to obtain a dry powder, and the spraying means. A swirling force applying means for applying a swirling force to the dry powder contained in the swirling flow including the jet flow of the above and the flow of the high temperature gas, and a swirling force applying means provided in the lower part of the drying chamber to collect the dried dry powder. A spray-drying apparatus and a spray-drying method, characterized in that the recovery means is provided. [Selection diagram] Fig. 1

Description

The present invention relates to a spray drying device and a spray drying method for producing dry powder.

Spray-drying equipment for producing dry powder by instantly drying a solvent contained in a raw material liquid such as a solution in which a substance is dissolved or a slurry in which a substance is dispersed with hot air, for example, is used for foods, pharmaceuticals, metal materials, and industry. It is widely used in the field of manufacturing materials and the like. In a general spray drying device, at least a spraying means for spraying a raw material liquid and a high-temperature gas such as hot air are brought into contact with the sprayed raw material liquid to evaporate the solvent contained in the raw material liquid to dry powder. It is provided with a drying means for producing a body and a collecting means for collecting the produced dry powder.

As shown in FIG. 9, in the normal spray drying device 15, the spray means 20'is provided at a substantially central portion of the top surface of the spray drying chamber 100'. The spraying machine 200'of the spraying means 20'sprays the raw material liquid supplied from the raw material liquid supplying means 30'into the spray drying chamber 100'by rotating at high speed. High-temperature gas is continuously supplied from the drying means 40'to the jet flow from the spray plate 200', and the jet flow from the spray plate 200'and the flow of the high-temperature gas are shown in the raw material liquid as shown by the dotted line in the figure. A swirling flow is formed with the evaporation of the contained gas, the swirling force is attenuated, and the swirling force is reduced while descending to the lower part of the spray drying chamber 100'.

The dry powder that has fallen while forming a swirling flow is recovered by the first dry powder recovery unit 800'as a recovery means provided in the lower part of the spray drying chamber 100'. By the way, along with the recovery of the dry powder in the first dry powder recovery unit 800', the cyclone type and bag filter type dust collectors are provided in the exhaust pipe 504'for exhausting the high temperature gas introduced into the spray drying chamber 100'. A second dry powder recovery unit is provided with a device 502', which collects dry powder having a small particle size and easily mixed in the exhaust flow from the direction of the lower arrow D of the cap member 506', and is connected to the dust collector 502'. A form of recovery at 802'is also known (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2007-285619

The dry powder recovered by the second dry powder recovery unit 802'connected to the dust collector 502'is smaller than the particle size of the dry powder recovered by the first dry powder recovery unit 800'. Therefore, the product value is poor in applications that require high fluidity, such as granulation of ceramics, metals, and the like. The dry powder recovered in the second dry powder recovery unit 802'for the above purposes and the like is often discarded or re-dissolved or dispersed in a predetermined solvent and reused. Therefore, if the amount of the dry powder recovered by the second dry powder recovery unit 802'is large, there is a risk that the productivity may be lowered due to the decrease in the yield rate.

The present invention has been made in view of such an actual situation, and an object of the present invention is that the dry powder can be recovered with a high recovery rate in the dry powder recovery unit provided in the lower part of the spray drying chamber. To provide a spray-drying device and a spray-drying method.

As a result of diligent research to solve the above problems, the inventor of the present application has applied a swirling force to the dry powder contained in the swirling flow including the jet flow from the spraying means and the flow of the high temperature gas. We have found that it is possible to solve the problem, and have completed the present invention.

That is, according to the first invention of the present invention, the raw material liquid is dried by bringing the high temperature gas into contact with the spraying means for spraying the raw material liquid into the drying chamber and the jet stream from the spraying means to dry the dry powder. The drying means for obtaining the drying means, the swirling force applying means for applying the swirling force to the dry powder contained in the swirling flow including the jet flow from the spraying means and the flow of the high temperature gas, and the swirling force applying means provided in the lower part of the drying chamber. Provided is a spray drying apparatus including a collecting means for recovering the dried dried powder.

Further, according to the second invention of the present invention, in the first invention, the swirling flow is a flow that moves downward in the drying chamber in a spiral shape, and the swirling force applying means dries the swirling force. Provided is a spray drying device characterized in that it is applied toward the interior wall side.

Further, according to a third invention of the present invention, in the second invention, the spray drying device is provided, wherein the turning force applying means includes a blade member that rotates by a predetermined driving force.

Further, according to a fourth aspect of the present invention, there is provided a spray drying device according to a third aspect, wherein the predetermined driving force is any one of an air motor, an electric motor, and a hydraulic motor. ..

Further, according to a fifth invention of the present invention, in the third invention, the predetermined driving force is based on compressed air or an inert gas supplied from a compressor, a blower, or a gas cylinder. A spray drying device is provided.

Further, according to a sixth aspect of the present invention, in the second invention, the swirling force applying means is a gas supply member that supplies gas along the wall of the drying chamber. Is provided.

Further, according to the seventh aspect of the present invention, there is provided a spray drying device according to the sixth aspect, wherein the gas is air or an inert gas.

Further, according to the eighth invention of the present invention, the raw material liquid is dried by bringing the high temperature gas into contact with the spraying step of spraying the raw material liquid into the drying chamber and the jet flow in the spraying step to obtain a dry powder. The drying step, the swirling force applying step for imparting a swirling force to the dry powder contained in the swirling flow including the jet flow in the spraying step and the flow of the high temperature gas, and the drying in the lower part of the drying chamber. Provided is a spray drying method comprising a recovery step of recovering the dry powder.

Further, according to the ninth invention of the present invention, in the eighth invention, the swirling flow is a flow that moves downward in the drying chamber in a spiral shape, and in the swirling force applying step, the swirling force is dried. Provided is a spray drying method characterized by applying toward the indoor wall side.

Further, according to the tenth invention of the present invention, in the ninth invention, there is provided a spray drying method characterized in that a blade member that rotates by a predetermined driving force is used in the turning force applying step.

Further, according to the eleventh invention of the present invention, in the tenth invention, there is provided a spray drying method characterized in that the predetermined driving force is any one of an air motor, an electric motor, and a hydraulic motor. ..

Further, according to the twelfth invention of the present invention, in the tenth invention, the predetermined driving force is based on compressed air or an inert gas supplied from a compressor, a blower, or a gas cylinder. A spray drying method is provided.

Further, according to the thirteenth invention of the present invention, in the ninth invention, the spray drying method is characterized in that a gas supply member for supplying gas along the drying chamber wall is used in the swirling force applying step. Is provided.

Further, according to the fourteenth invention of the present invention, the thirteenth invention provides a spray drying method characterized in that the gas is air or an inert gas.

According to the present invention, it is possible to provide a spray drying device and a spray drying method capable of recovering dry powder with a high recovery rate in a dry powder recovery unit provided in the lower part of the spray drying chamber.

It is explanatory drawing which shows the structure of the spray drying apparatus which concerns on embodiment of this invention. It is explanatory drawing which shows the structure of the turning force applying member which concerns on embodiment of this invention. It is explanatory drawing which shows the structure of the turning force applying member which concerns on embodiment of this invention. It is explanatory drawing which shows the other structure of the blade member provided in the turning force applying member which concerns on embodiment of this invention. It is explanatory drawing which shows the other structure of the blade member provided with the member with a turning force which concerns on embodiment of this invention. It is explanatory drawing which shows the other structure of the turning force applying member which concerns on embodiment of this invention. It is explanatory drawing which shows the other structure of the blade member provided in the turning force applying member which concerns on embodiment of this invention. It is explanatory drawing which shows the other structure of the spray drying apparatus which concerns on embodiment of this invention. It is a figure which shows the structure of the spray drying apparatus which concerns on the prior art.

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 means / members having the same configuration may be designated by the same reference numerals and the description thereof may be omitted.

FIG. 1 is an explanatory diagram showing a configuration of a spray drying device 10 according to an embodiment of the present invention. The spray drying device 10 is a device capable of obtaining fine-grained dry powder by drying a raw material solution such as a solution in which a substance is dissolved or a slurry in which a substance is dispersed. Such a spray drying device 10 includes a spraying means 20 having a spraying board 200 and spraying a raw material liquid into the spray drying chamber 100, a raw material liquid supplying means 30 for supplying the raw material liquid to the spraying means 20, and a spray drying chamber. A drying means 40 that supplies a high-temperature gas into the 100 to dry the raw material liquid, and an exhaust / collecting means 50 that exhausts the high-temperature gas supplied into the spray drying chamber 100 and collects dry powder having a small particle size. A swirling force applying means 60 for applying a swirling force to the dry powder contained in the swirling flow including a jet flow from the spraying means and a flow of the high temperature gas, and a swirling force applying member 600 provided in the swirling force applying means 60. A gas supply means 70 for supplying a gas serving as a driving force thereof and a recovery means 80 for recovering the dry powder are provided.

The spray drying chamber 100 is a container for promoting drying by bringing a raw material liquid such as a solution in which a substance is dissolved or a slurry in which a substance is dispersed into contact with a high-temperature gas such as hot air. The spray drying chamber 100 can be formed of, for example, a steel material such as stainless steel, and can be configured as a substantially cylindrical hollow body whose diameter is reduced downward in a conical shape. As shown by the dotted line in the figure, the jet flow from the spray plate 200 and the flow of the high temperature gas supplied from the drying means 40 form a swirling flow with evaporation of the solvent contained in the raw material liquid, and the swirling force is attenuated. By finally descending to the lower part of the spray drying chamber 100 indicated by the arrow C while reducing the swirl diameter, the first dry powder collecting unit 800 as the collecting means 80 provided through the opening 104 collects the gas. Will be done. As the first dry powder recovery unit 800, for example, various recovery means such as a conical or square pyramid-shaped hopper, a tray, and a bag can be applied, and connecting means for ferrules, bands, clamps, flanges, and the like. As long as it can be detachably connected to the spray drying chamber 100 via the above, 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 any means such as a screw feeder or air transportation. A knocker and a vibrator that forcibly flow the dry powder accumulated or adhered to the drying chamber wall and the conical portion by giving an impact / vibration to the outer wall 102 of the spray drying chamber 100 and guide it to the first dry powder collecting portion 800. The impact / vibration applying means 108 such as the above may be provided.

The spraying means 20 is provided at a substantially central portion of the top surface portion 106 of the spray drying chamber 100, and sprays the raw material liquid radially outward by the centrifugal force accompanying the high-speed rotation of the spraying machine 200. The spraying means 20 includes a motor (not shown), a rotating shaft, and the like for rotating the spraying board 200 at high speed, and is connected to a raw material liquid supply pipe 304 that supplies the raw material liquid to the spraying board 200. The spraying machine 200 is not particularly limited, but various shapes such as a pin type, a Kessner type, a vane type, and a slit vane type can be used. These may be appropriately selected in consideration of various circumstances such as the size and uniformity of the particles obtained as the dry powder, and the physical and chemical properties of the stock solution to be sprayed. The spraying means 20 is not limited to the spraying machine, and for example, a pressure nozzle, a two-fluid nozzle, a four-fluid nozzle, an ultrasonic nozzle, and the like can also be used.

The raw material supply means 30 is configured by connecting a raw material liquid tank 300 for storing the raw material liquid and a pump 302 by a raw material liquid supply pipe 304. The raw material liquid supply pipe 304 is connected to a raw material liquid supply pipe (not shown) of the spraying means 20, and the raw material liquid stored in the raw material liquid tank 300 is supplied to the spraying board 200 of the spraying means 20 by driving the pump 302. NS. As the raw material contained in the raw material solution 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, etc. So-called fine ceramic raw materials such as zirconia, alumina, mullite, ferrite, forsterite, barium titanate, lead zirconate titanate, steatite, and zircon, and ceramic raw materials such as glass and cement are dissolved in an appropriate solvent and dissolved in a solution. It can be used as a raw material solution in the form of a slurry or in the form of a slurry by dispersing in a solvent.

The drying means 40 is configured by connecting the filter 400, the blower 402, and the heater 404 by a high temperature gas supply pipe 406. The drying means 40 heats the air taken in by the blower 402 through the filter 400 by the heater 404 and introduces it as hot air into the spray drying chamber 100 through the high temperature gas supply pipe 406. As the gas supply source, compressed air via a compressor, nitrogen through a gas cylinder or the like, or an inert gas such as argon gas can also be used.

For example, when the spraying machine 200 sprays the raw material liquid outward in the radial direction (in the direction of arrow X in the figure) while rotating clockwise in the direction of arrow F in the figure, it is swirled and introduced by the drying means 40 from the direction of Y in the figure. The high-temperature gas (hot air) comes into contact with each other, and the jet flow from the spray plate 200 and the flow of the high-temperature gas from the drying means 40 apparently form a swirling flow that swirls in the Z direction in the drawing in the spray drying chamber 100. The swirling force is attenuated and the swirling diameter is reduced while descending to the lower part of the spray drying chamber 100.

In the exhaust / collection means 50, a blower 500 for exhausting the high temperature gas in the spray drying chamber 100 to an exhaust pipe 504 inserted to a substantially central position in the spray drying chamber 100 is a cyclone type or a bag filter type dust collecting means. It is configured by being connected via device 502. The dry powder mixed in the exhaust flow of the high-temperature gas having a small particle size is exhausted from the lower part of the cap member 506 located at the tip of the exhaust pipe 504 in the direction of arrow E in the figure, and is collected by the dust collector 502. A second dry powder recovery unit 802 as a recovery means 80 is connected to the dust collector 502. Similar to the first dry powder recovery unit 800, the second dry powder recovery unit 802 can be applied with various recovery means such as a conical or square pyramid-shaped hopper, a tray, and a bag body. There are no restrictions on the type and use of the dust collector 502 as long as it can be detachably connected to the dust collector 502 via a connecting means such as a ferrule, a band, a clamp, or a flange. Further, the dry powder may be transported to a storage facility such as a silo by any means such as a screw feeder or air transportation.

The swirling force applying means 60 includes a swirling force applying member 600 that applies a swirling force to the dry powder contained in the swirling flow including the jet flow from the spray plate 200 and the flow of the high temperature gas from the drying means 40. The swirling force applying member 600 is based on the gas (inert gas such as air, nitrogen or argon gas) supplied from the gas supply means 70, and is in the same direction as the rotation direction of the spray plate 200 (F direction in the figure). By rotating in the direction of arrow B, a swirling force is applied to the dry powder contained in the swirling flow. The dry powder that descends while reducing the swirl diameter is directed toward the inner wall side of the spray drying chamber 100 outside the swirl diameter in the direction of arrow A in the drawing by the swirl force applied by the swirl force applying member 600. The movement of the dried powder toward the inner wall side of the spray drying chamber 100 is more remarkable as the particle size is larger. Then, even the dry powder having a small particle size, which was conventionally collected by the exhaust / collecting means 50, can be deviated from the conventional falling trajectory by applying a turning force and can be collected by the first dry powder collecting unit 800. It becomes.

The gas supply means 70 includes a filter 700, a blower 702, and a heater 704 connected by a gas supply pipe 706. The gas supply means 70 heats the gas (air) taken in by the blower 704 through the filter 700 by the heater 702, and drives the swirling force applying member 600 to rotate through the gas supply pipe 706 inserted into the spray drying chamber 100. Supply as a source. As the gas supply source, compressed air via a compressor, nitrogen through a gas cylinder or the like, or an inert gas such as argon gas can also be used.

FIG. 2 is an explanatory view showing a configuration of a turning force applying member 600 included in the turning force applying means 60 according to the present embodiment, and FIG. 3 is a configuration of the turning force applying member 600 seen from the direction of arrow G shown in FIG. It is explanatory drawing which shows. The swirling force applying member 600 includes a blade member 610 that rotates based on a gas (air, compressed air, or an inert gas such as nitrogen or argon gas) supplied from the gas supply means 70, and swirls in the spray drying chamber 100. A swirling force is applied to the swirling flow. The main body portion 602 of the turning force applying member 600 is formed in a hollow cylindrical shape by a steel material such as stainless steel, and one end side end portion thereof can be placed on the roof portion of the cap member 506 located at the tip of the exhaust pipe 504. A foot portion 604 having an enlarged inner diameter of the main body portion 602 is formed so as to be. Further, by making the roof portion of the cap member 506 horizontal, it is possible to install the foot portion 604 without expanding the diameter. Then, inside the main body 602, a rotating shaft is formed by a gas (air, compressed air, or an inert gas such as nitrogen or argon gas) supplied from a gas supply pipe 706 connected via an L-shaped joint member 708. The air motor 606 that drives the 608 is housed. As the drive source for driving the rotary shaft 608, for example, an electric motor, a hydraulic motor, or the like can be used in addition to the air motor.

A blade member 610 is connected to the rotating shaft 608 via a shaft support portion 620, and the blade member 610 is configured to be rotatable by the rotation of the rotating shaft 608 accompanying the drive of the air motor 606. In the blade member 610, a plurality of blade piece members 614 (4 in the present embodiment) are fixed at equal angle intervals on a rotating plate portion 612 integrally formed with the shaft support portion 620, and the rotating plate portion 612 rotates. As the blade piece member 614 rotates, a swirling force can be applied to the swirling flow swirling in the spray drying chamber 100. The blade piece member 614 can be formed, for example, by bending a long plate steel material such as stainless steel into an L shape so that a fixing end portion and a blade piece portion are formed. Then, as shown in FIG. 3, it may be fixed to the rotating plate portion 612 with screws or bolts via a fixing hole 618 provided in the fixing end portion 616, or it may be fixed by an appropriate adhesive means such as welding. It doesn't matter.

Further, for example, it is also possible to use the blade member 630 as shown in FIG. 4 as the turning force applying member. The blade member 630 has a so-called flat blade turbine-like structure, and blade piece members 634 are provided at equal angular intervals (six in this example) on the peripheral edge of the rotary plate portion 632 integrally formed with the shaft support portion 636. ing. Similar to the blade member 610, the blade member 630 can rotate the blade piece member 634 by the rotation of the rotating shaft 608 accompanying the drive of the air motor 606.

Further, for example, a blade member 640 in which two paddle-shaped blade piece members 644 as shown in FIG. 5 (a) are directly provided on the shaft support portion 642, and four paddle-shaped blade members as shown in FIG. 5 (b). It is also possible to use a blade member 650 or the like in which the blade piece member 654 is directly provided on the shaft support portion 652. In this case, it is of course possible to provide the blade member with an inclination angle by adjusting the attachment angle with respect to the shaft support portion. Needless to say, it is possible to use a member having a shape such as a simple three-propeller or four-propeller as a blade member.

The turning force applying member described above has been described in which an air motor, an electric motor, a hydraulic motor, or the like is used as a drive source for the rotating shaft, but the turning force applying member according to the present invention is not limited thereto. do not have. For example, the turning force applying member 660 shown in FIG. 6 can rotate the blade member by directly discharging the air (compressed air) supplied from the compressor or the blower. Specifically, the swirling force applying member 660 is generated by the gas generating means 712 of the compressor or the blower and is supplied to the air (compressed air) via the compressed air supply pipe 714, similarly to the swirling force applying member 600. A blade piece member 662 that rotates based on the blade piece member 662 is provided, and a swirling force is applied to a swirling flow that swirls in the spray drying chamber 100. The main body 602 of the turning force applying member 660 is formed in a hollow cylindrical shape by a steel material such as stainless steel, and one end side end thereof can be placed on the roof portion of the cap member 506 located at the tip of the exhaust pipe 504. A foot portion 604 having an enlarged inner diameter of the main body portion 602 is formed so as to be. Further, by making the roof portion of the cap member 506 horizontal, it is possible to install the foot portion 604 without increasing the diameter. Inside the main body 602, a compressed air supply pipe 720 inside the main body that supplies air (compressed air) supplied from the compressed air supply pipe 714 connected via the L-shaped joint member 708 to the injection port 726 is housed. ing. The rotating shaft 724, which rotates together with the blade member 662 when air (compressed air) is injected from the injection port 726, is formed so that the inside thereof is hollow, and the air supplied from the compressed air supply pipe 720 in the main body is formed. It is pivotally supported by a bearing portion 722 so that it can be rotated by (compressed air).

In addition, the blade member 640 in which the two paddle-shaped blade piece members 644 shown in FIG. 5A are directly provided on the shaft support portion 642, and the four paddle-shaped blade piece members shown in FIG. 5B are provided. As for the blade member 650 or the like in which the 654 is directly provided on the shaft support portion 652, the blade member can be rotated by directly discharging the supplied air (compressed air) as in the case of the turning force applying member 660. In this case, as in the blade member 640'shown in FIG. 7A, the blade is provided from the shaft support portion 642 so that air (compressed air) can be supplied to the injection port 646 formed on the surface of the blade piece member 644. The inside of the one member 644 may be configured to have a hollow structure. Similarly, with respect to the blade member 650'shown in FIG. 7B, the shaft support portion 652 can supply air (compressed air) to the injection port 656 formed on the surface of the blade piece member 654. The inside of the blade piece member 654 may be configured to have a hollow structure. With such a configuration, the blade member can be rotated with the direct discharge of air (compressed air). As the driving force for driving the blade member, it is possible to use an inert gas such as nitrogen or argon gas via a gas cylinder or the like in addition to the air (compressed air) supplied from the compressor or the blower. ..

When the dry powder is produced by using the spray drying device 10 having the above configuration, the spray board 200 is operated at about 50 to 60,000 rpm with the raw material liquid supplied to the inside of the spray board 20 via the raw material liquid supply pipe 304. Rotate at speed. Due to the centrifugal force accompanying the rotation of the spray plate 200, the raw material liquid supplied to the inside of the plate is sprayed in all directions of 360 ° outside in the radial direction in the direction of arrow X in FIG. When the raw material liquid is sprayed in all directions 360 ° radially outward in the X direction of the arrow X in FIG. 1 while the spraying machine 200 is rotating, the high temperature gas (hot air) swirled and introduced from the Y direction in the drawing comes into contact with the drying means 40. , The jet flow from the spray plate 200 and the flow of the high temperature gas from the drying means 40 form a swirling flow swirling in the Z direction in the drawing in the spray drying chamber 100, and the swirling force is attenuated and the swirling diameter is reduced. While doing so, it descends to the lower part of the spray drying chamber 100. At this time, the swirling force applying means 60 applies the swirling force to the dry powder contained in the swirling flow including the jet flow from the spray plate 200 and the flow of the high temperature gas from the drying means 40. The swirling force applying member 600 included in the swirling force applying means 60 is based on the gas supplied from the gas supplying means 70 (air (compressed air), an inert gas such as nitrogen or argon gas), and the rotation direction of the spray plate 200. By rotating in the same direction, a swirling force is applied to the dry powder contained in the swirling flow. The dry powder that descends while attenuating the turning force and reducing the turning diameter shall be directed toward the inner wall side of the spray drying chamber 100 outside the turning diameter in the direction of arrow A in the figure by the turning force applied by the turning force applying member 600. become. Then, even the dry powder having a small particle size, which was conventionally collected by the exhaust / collecting means 50, can be deviated from the conventional falling trajectory by applying a turning force and can be collected by the first dry powder collecting unit 800. Therefore, the yield in the first dry powder recovery unit 800 can be improved.

[Example]
In order to confirm the effect of the spray drying device 10 according to the present embodiment, the spray drying device 10 (with blades) having a swirling force applying means and the conventional spray drying device 15 (without blades) shown in FIG. 9 are used. The yields of the dry powder recovered by the first dry powder recovery unit 800 provided directly below the spray drying chamber 100 were compared.

This test was carried out under the conditions shown in Table 1, and a slurry (alumina 50% slurry) in which alumina was dispersed in water as a solvent was used as the raw material liquid.

As is clear from Table 1, in the spray-drying apparatus 10 according to the present embodiment, the yield (yield (under the main body)) of the first dry powder recovery unit 800 provided directly under the spray-drying chamber 100 is determined by the blades. It was confirmed that the improvement was greatly improved as compared with that of the spray drying device 12 according to the conventional type without any. Even from the fact that the yield (yield (cyclone)) in the second dry powder recovery unit 802 is lower than that of the spray drying device 12 according to the conventional type without blades, most of the dry powder is the first. 1 It was found that the dry powder was recovered in the dry powder recovery unit 800.

[Modification example]
The swivel force applying members 600 to 650 included in the swirling force applying means described above include a blade member that rotates based on the supplied gas (air (compressed air), an inert gas such as nitrogen or argon gas). However, the means for imparting a swirling force to the dry powder contained in the swirling flow is not limited to this. For example, the spray drying device 12 shown in FIG. 8A provides a gas supply means 70'that supplies a gas (an inert gas such as air (compressed air), nitrogen, or argon gas) along the inner wall of the spray drying chamber 100. It is also possible to configure the gas (air (compressed air), inert gas such as nitrogen or argon gas) supplied from the gas supply means 70'as a means for applying a swirling force to the dry powder contained in the swirling flow. be.

The spray-drying device 12 can have the same configuration as the spray-drying device 10 described above except for the gas supply means 70'. The gas supply means 70'consists of a filter 700, a blower 702, and a heater 704 connected by a gas supply pipe 706'. The gas supply means 70'heats the gas (air) taken in by the blower 704 through the filter 700 by the heater 702 and supplies the gas (air) into the spray drying chamber 100 through the gas supply pipe 706'. Here, the gas supply pipe 706'can supply gas (air) along the inner wall of the spray drying chamber 100 as shown in the cross-sectional view taken along the line TT' in FIG. 8 (a) (FIG. 8 (b)). A spout 728 for ejecting gas (air) is formed at the tip of the spout. The gas (air) ejected from the ejection port 728 in the direction of arrow H in the figure swirls along the inner wall of the spray drying chamber 100, and is composed of a jet flow from the spray plate 200 and a flow of high temperature gas from the drying means 40. A swirling force can be applied to the dry powder contained in the swirling flow. As the gas supply source, compressed air via a compressor, nitrogen through a gas cylinder or the like, or an inert gas such as argon gas can also be used. The gas (air (compressed air), inert gas such as nitrogen or argon gas) supplied via the gas supply means 70'is a gas (air (compressed air)) in order to suppress the occurrence of dew condensation in the apparatus. ), Inert gas such as nitrogen or argon gas) is preferably warm (hot) air heated by the heater 702.

As a means for imparting a swirling force to the dry powder contained in the swirling flow, a configuration in which a gas (air (compressed air), an inert gas such as nitrogen or argon gas) is supplied along the inner wall of the spray drying chamber 100 is a spray drying device. It is especially useful when the size of the is increased. That is, in this configuration, since it is not necessary to increase the size of the blade member as the turning force applying means as the size of the device increases, the device configuration can be simplified and the cost related to the device manufacturing can be suppressed. It will be possible.

As described above, according to the present invention, there is provided a spray drying device and a spray drying method capable of recovering dry powder with a high recovery rate in the dry powder recovery unit provided in the lower part of the spray drying chamber. be able to.

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, and for example, the present invention is applied to a spray freeze-dried powder manufacturing apparatus in which droplets of a sprayed raw material liquid are coagulated and solidified in a low temperature environment and freeze-dried to obtain a dry powder. It is also possible to apply.

10, 12, 15 ... Spray drying device, 20, 20'... Spraying means, Raw material liquid supply means ... 30, 30',
40, 40'... drying means, 50 ... exhaust / collecting means, 60 ... swirling force applying means, 70, 70' ... gas supplying means, 80 ... collecting means, 100, 100' ... spray drying chamber, 102 ... outer wall, 104 ... Opening, 106 ... Top surface, 108 ... Impact / vibration applying means, 200, 200'... Sprayer, 300 ... Raw material liquid tank, 302 ... Pump, 304 ... Raw material liquid supply pipe, 400 ... Filter, 402 ... Blower , 404 ... Heater, 406 ... High temperature gas supply pipe, 500 ... Blower, 502, 502'... Dust collector, 504, 504' ... Exhaust pipe, 506, 506' ... Cap member, 600, 660 ... Turning force applying member, 602 ... Main body, 604 ... Foot, 606 ... Air motor, 608,724 ... Rotating shaft, 610, 630, 640, 640', 650, 650' ... Blade member, 612,632 ... Rotating plate, 614,634 644, 654, 662 ... Blade piece member, 618 ... Fixing end, 620, 636,642, 652 ... Shaft branch, 646,656 ... Injection port, 700 ... Filter, 702 ... Blower, 704 ... Heater, 706 ... Gas Supply pipe, 708 ... L-shaped joint member, 712 ... Gas generating means, 714 ... Compressed air supply pipe, 720 ... Compressed air supply pipe in the main body, 722 ... Bearing part, 800, 800'... First dry powder recovery part, 802,802'... Second dry powder recovery unit,

Claims (14)

A spraying means for spraying the raw material liquid into the drying chamber,
A drying means for drying the raw material liquid by bringing a high-temperature gas into contact with a jet stream from the spraying means to obtain a dry powder, and a drying means.
A swirling force applying means for imparting a swirling force to the dry powder contained in the swirling flow composed of a jet flow from the spraying means and a flow of the high temperature gas.
A spray drying device provided in the lower part of the drying chamber and provided with a collecting means for collecting the dried dried powder. The first aspect of claim 1, wherein the swirling flow is a flow that spirally moves downward in the drying chamber, and the swirling force applying means applies the swirling force toward the wall side of the drying chamber. Spray dryer. The spray drying device according to claim 2, wherein the turning force applying means includes a blade member that rotates by a predetermined driving force. The spray drying device according to claim 3, wherein the predetermined driving force is any one of an air motor, an electric motor, and a hydraulic motor. The spray drying apparatus according to claim 3, wherein the predetermined driving force is based on compressed air or an inert gas supplied from a compressor, a blower, or a gas cylinder. The spray drying device according to claim 2, wherein the swirling force applying means is a gas supply member that supplies gas along the wall of the drying chamber. The spray drying device according to claim 6, wherein the gas is air or an inert gas. A spraying step that sprays the raw material liquid into the drying chamber,
A drying step of drying the raw material liquid by bringing a high-temperature gas into contact with the jet stream in the spraying step to obtain a dry powder, and a drying step.
A swirling force applying step for imparting a swirling force to the dry powder contained in the swirling flow including the jet flow and the high temperature gas flow in the spraying step, and the swirling force applying step.
A spray drying method comprising a recovery step of recovering the dried dry powder in the lower part of the drying chamber. The eighth aspect of the present invention, wherein the swirling flow is a flow that spirally moves downward in the drying chamber, and in the swirling force applying step, the swirling force is applied toward the wall side of the drying chamber. Spray drying method. The spray drying method according to claim 9, wherein in the turning force applying step, a blade member that rotates by a predetermined driving force is used. The spray drying method according to claim 10, wherein the predetermined driving force is any one of an air motor, an electric motor, and a hydraulic motor. The spray drying method according to claim 10, wherein the predetermined driving force is based on compressed air or an inert gas supplied from a compressor, a blower or a gas cylinder. The spray drying method according to claim 9, wherein in the swirling force applying step, a gas supply member that supplies gas along the drying chamber wall is used. The spray drying method according to claim 13, wherein the gas is air or an inert gas.

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