JP6700716B2 - Drying method and drying apparatus - Google Patents

Description

  The present invention relates to a drying method and a drying device for drying a material to be dried containing an organic solvent.

  Conventionally, for example, when a material to be dried (powder or granular material) containing an organic solvent is dried and a powder or granular material such as a resin is taken out, the material to be dried is generally dried by vacuum drying (conduction heat transfer). Target.

  However, even when the material to be dried is vacuum-dried, the inside of the material to be dried is more difficult to dry than the surface, and it is desirable to efficiently remove the organic solvent inside the material to be dried and to dry it efficiently. Was there.

  Therefore, to form a fluidized bed of the material to be dried by generating a hot air stream from below against the material to be dried, and in the state where the surface area per volume of powder or granules etc. is increased, contact with hot air to dry. Discloses a technique for efficiently drying powder and granules and the like. (See, for example, Non-Patent Document 1).

http://www.mmtec.co.jp/products/dryer/011210.html

However, if an organic solvent (internal solvent) is present inside the powder or granules that make up the material to be dried, the organic solvent is sufficiently removed from the material to be dried to efficiently dry the material to be dried. It's not easy to do.
As a result, it may be difficult to efficiently obtain a powder or granule satisfying sufficient performance and quality.

  The present invention has been made in view of such problems, the material to be dried containing an organic solvent, by sufficiently removing the organic solvent contained in the inside of the granular material, etc. It is an object of the present invention to provide a drying method and a drying device that can efficiently secure a powder or the like having good performance and quality from a material to be dried.

  Therefore, as a result of earnest research on a technique for efficiently drying a material to be dried containing an organic solvent, the inventors formed a fluidized bed M3 of the material to be dried and superheated the fluidized material to be dried with superheated steam. The superheated steam condenses on the surface of the powder or granules by contacting with, and the organic solvent contained in the powder or granules is efficiently heated by the latent heat of condensation, and as a result, the internal solvent is sufficient. It was found that it is possible to efficiently and stably secure the powder particles and the like that have been removed.

In order to solve the above problems, the present invention proposes the following means.
The invention according to claim 1 is a method for drying an article to be dried containing an organic solvent, wherein the article to be dried is arranged between the superheated steam receiving section of a cylindrical container having a superheated steam receiving section arranged below. The dried object is placed on the dried product receiving shelf, and a vibration layer is applied to the cylindrical container to form a fluidized bed in which the dried object jumps up and down to receive the superheated steam. A portion of the superheated steam is flowed into the tubular container, the superheated steam is contacted with the object to be dried jumped , to heat and dry the object to be dried while condensing the superheated steam. Characterize.

The invention according to claim 4 is a drying device for drying an article to be dried containing an organic solvent, wherein a superheated steam receiving section is disposed below and the article to be dried is placed between the superheated steam receiving section. A cylindrical container in which the material to be dried to be placed is placed, a superheated steam generator that generates superheated steam, a cylindrical container vibrating unit that vibrates the cylindrical container, and a controller, and The control unit vibrates the tubular container by the tubular container vibrating unit to fluidize the material to be dried in a state of jumping in the tubular container to form a fluidized bed, and to superheat the fluidized bed. It is characterized in that steam is introduced to bring the superheated steam into contact with the object to be dried, and the object to be dried is heated and dried while condensing the superheated steam.

ADVANTAGE OF THE INVENTION According to the drying method and drying apparatus which concern on this invention, the to-be-dried material containing the organic solvent is accommodated in a cylindrical container, and the to-be-dried material containing the organic solvent is fluidized in a cylindrical container, and a fluidized bed is obtained. To form a liquid, flowing superheated steam into the fluidized bed, to contact the dried material containing the organic solvent with the superheated steam, to heat and dry the dried material containing the organic solvent while condensing the superheated steam. Thus, the organic solvent can be sufficiently removed from the inside of the granular material or the like constituting the material to be dried, and the material to be dried can be efficiently dried.
As a result, it is possible to prevent the granular material contained in the material to be dried from being dried while the organic solvent remains inside.
Further, by vibrating the cylindrical container, the material to be dried containing the organic solvent can be fluidized, and the fluidized bed M3 of the material to be dried can be efficiently formed.
As a result, the fluidized material to be dried can be efficiently brought into contact with the superheated steam to efficiently and stably dry the material to be dried.

A second aspect of the present invention is the drying method according to the first aspect, wherein superheated steam depressurized to a predetermined pressure or less is flown into the cylindrical container to cause the superheated steam depressurized to jump. It is characterized in that the material to be dried is brought into contact with the material to be dried under reduced pressure to heat and dry the material to be dried.

A fifth aspect of the present invention is the drying device according to the fourth aspect , wherein the control unit causes superheated steam depressurized to a predetermined pressure or less to flow into the tubular container to depressurize the superheated steam. It is characterized in that the water vapor and the material to be dried that has been made to jump and fluidize are brought into contact with each other under reduced pressure, and the material to be dried is heated and dried.

  According to the drying method and the drying apparatus according to the present invention, the superheated steam depressurized to a predetermined pressure or less flows into the cylindrical container, and the depressurized superheated steam and the fluidized material are brought into contact with each other in a depressurized state. Then, since the material to be dried is heated and dried, the material to be dried can be heated to a predetermined temperature of less than 100° C. and dried.

  A third aspect of the present invention is the drying method according to the second aspect, wherein the superheated steam in the cylindrical container is condensed at a temperature equal to or lower than a target heating temperature of the object to be dried. The inside of the container is depressurized.

The invention according to claim 6 is the drying device according to claim 5 , wherein the control unit condenses the superheated steam in the cylindrical container at a temperature equal to or lower than a target heating temperature of the object to be dried. Thus, the inside of the cylindrical container is depressurized.

According to the drying method and the drying apparatus according to the present invention, since the superheated steam in the tubular container reduces the pressure in the tubular container so as to condense at a temperature equal to or lower than the target heating temperature of the dried object, By heating and drying the dried product at a desired temperature below the target heating temperature, it is possible to suppress deterioration of the performance or quality of the granular material or the like that constitutes the material to be dried, and to manufacture high-quality granular material or the like. be able to.
Here, the target heating temperature is a target overheating temperature when taking out the powder or granules or the like from the material to be dried, for example, in order to ensure the performance or quality of the powder or granules or the like constituting the material to be dried. , The temperature set in consideration of the physical properties and chemical properties of the granular material, the temperature at which they have a desired margin, and the like.

According to the drying method and the drying apparatus according to the present invention, since the material to be dried containing the organic solvent is heated by the superheated steam, the organic solvent in the material to be dried is sufficiently removed, and the material to be dried is efficiently Can be dried.
As a result, it is possible to prevent the granular material contained in the material to be dried from being dried while the organic solvent remains inside.

It is a figure explaining the schematic structure of the granular material drying device concerning a 1st embodiment of the present invention, and is a figure showing an example of operation at the time of drying an object to be dried with superheated steam. It is a figure explaining the schematic structure of the fluidized bed vibration drying part concerning a 1st embodiment of the present invention, (A) is a front view explaining the schematic structure, and (B) is a vertical section explaining the schematic structure of the internal structure. The side view is shown. It is a figure explaining an example of an outline of an operation of a granular material drying device concerning a 1st embodiment of the present invention. It is a conceptual diagram explaining the effect|action at the time of drying the granular material which comprises the dried material which concerns on this invention in a fluidized bed. It is a figure explaining the schematic structure of the granular material drying device concerning a 2nd embodiment of the present invention, and is a figure showing an example of operation at the time of drying a to-be-dried material with superheated steam of a pressure reduction state.

<First Embodiment>
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a configuration diagram illustrating a schematic configuration of a powdery or granular material drying apparatus according to the first embodiment. In FIG. 1, reference numeral 1 indicates a powdery-particle drying apparatus, and reference numeral 10 indicates a fluidized bed vibration drying unit.

  As shown in FIG. 1, the powdery or granular material drying apparatus 1 includes, for example, a fluidized bed vibration drying unit 10, a steam supply source S for supplying saturated steam, and a decompression for decompressing saturated steam supplied from the steam supply source S. A valve 11, a first stop valve 111, a heater (superheated steam generator) 14, a heat exchanger 17, a condensed water tank 18, and a controller (not shown) are provided.

  The control unit fluidizes the material to be dried accommodated in the fluidized bed vibration drying unit 10 to form a fluidized bed in the powder and granular material drying device 1, and superheats the material to be dried in the fluidized bed vibration drying unit 10. The material to be dried is brought into contact with and dried.

The pressure reducing valve 11 is connected to a steam supply source S such as a boiler (not shown) that generates saturated steam via a flow passage L10, and the saturated steam supplied from the steam supply source S via the flow passage L10. Is reduced to generate saturated steam of 0.1 to 0.3 MPa, for example.
Further, the downstream side of the pressure reducing valve 11 is connected to the heater 14 via the flow passage L11.

  The first stop valve 111 is arranged in the flow passage L11, and is operated to open and close to control the saturated steam decompressed by the pressure reducing valve 11 to flow to the heater 14.

  The heater 14 heats the saturated steam, which is pressure-adjusted by the pressure reducing valve 11 and is sent through the flow passage L11, to 100° C. or higher to generate superheated steam that is condensed at 100° C. at atmospheric pressure. It has become.

  The fluidized bed vibration drying unit 10 is connected to the heating heater 14 via the flow passage L12, and the material to be dried contained therein is supplied to the superheated steam S12 supplied from the heating heater 14 via the flow passage L12. The materials to be dried are brought into contact with each other and dried. The details of the fluidized bed vibration drying unit 10 will be described later.

  The heat exchanger 17 is connected to the fluidized bed vibration drying section 10 by a flow passage L13, and water vapor containing an organic solvent flowing from the fluidized bed vibration drying section 10 via the flow passage L13 and a cooling water supply passage. The cooling water C1 supplied through is cooled by heat exchange and the water vapor containing the organic solvent is condensed to generate condensed water. Reference numeral C2 indicates cooling water after heat exchange.

  In addition, the heat exchanger 17 is provided with a sufficient heat exchange capacity for water vapor containing the organic solvent flowing from the fluidized bed vibration drying section 10, so that the organic solvent contained in the material to be dried can be sufficiently recovered. It is preferable to configure.

  The condensed water tank 18 is connected to the heat exchanger 17 via the flow passage L14, and receives and stores the condensed water S14 condensed by the heat exchanger 17 via the flow passage L14.

Next, the fluidized bed vibration drying section 10 will be described with reference to FIG.
FIG. 2 is a diagram for explaining the schematic configuration of the fluidized bed vibration drying unit 10, FIG. 2(A) is a front view showing the schematic configuration, and FIG. 2(B) is a vertical cross-sectional view showing the schematic configuration of the internal structure. It is a figure.

As shown in FIG. 2A, the fluidized bed vibration drying unit 10 includes, for example, a base 101, a vibration transmission unit 102, a vibration motor (cylindrical container vibrating means) 103, an overheated steam receiving unit 104, and A cylindrical container 105 and a container top plate 106 are provided.
Further, the fluidized bed vibration drying unit 10 is provided with a drying object receiving rack 107 therein, as shown in FIG. 2(B).

  The vibration transmitting unit 102 is arranged on the base 101, and two vibration motors 103 are provided at positions symmetrical to the central axis of the longitudinal direction in a direction intersecting the central axis. Further, an overheated steam receiver 104 and a cylindrical container 105 are arranged in this order above the vibration transmitter 102. The vibration generated by the vibration motor 103 is transmitted to the superheated steam receiver 104 and the cylindrical container 105 via the vibration transmitter 102.

The superheated steam receiver 104 is connected to the flow passage L12, and sends the superheated steam S12 flowing from the flow passage L12 to the cylindrical container 105.
The cylindrical container 105 has an upper portion covered with a container top plate 106, and a dried object receiving shelf 107 is arranged in the lower portion, and the dried object receiving shelf 107 can be placed with the dried object M1. There is. Further, the cylindrical container 105 can be accommodated in a state where the material to be dried M1 is jumped up or in a state where the material to be dried M1 is fluidized.

  In addition, a flow passage L13 is connected to the top plate 106 of the container, and superheated steam (or steam) containing an organic solvent that is contacted with the material to be dried and removed from the material to be dried is passed through the flow passage L13. It is designed to be discharged.

  The dried object receiving shelf 107 is made of, for example, punching metal or a mesh plate, allows the superheated steam to flow from the overheated steam receiving portion 104 to the cylindrical container 105, and vibrates on the placed dried object M1. In addition, the fluidized material to be dried, the inserted granular material, and the like are prevented from falling from the cylindrical container 105.

Then, in this embodiment, a stream of superheated steam is generated from the lower side to the upper side of the material to be dried M1 to form a fluidized bed of the material to be dried M1 in the cylindrical container 105, and with this fluidized bed, The material to be dried is brought into contact with superheated steam.
In this embodiment, the material to be dried is fluidized by the superheated steam, but the material to be dried may be fluidized by using an air flow of a substrate other than the superheated steam such as air or an inert gas.

  Further, in this embodiment, the material to be dried M1 housed in the cylindrical container 105 is vibrated by the vibration motor 103 via the vibration transmission section 102 to form a fluidized bed of the material to be dried M1 and the material to be dried. M1 is efficiently agitated to facilitate contact of the material to be dried M1 with the superheated steam S12.

Hereinafter, with reference to FIG. 1, an operation procedure of the powdery or granular material drying device 1 will be described.
(1) First, in FIG. 1, the first stop valve 111 is opened to take in saturated steam S0 from the steam supply source S.
(2) Then, as shown in FIG. 1, the saturated water vapor S0 thus taken in is transferred to the pressure reducing valve 11 through the flow passage L10, and the pressure reducing valve 11 reduces the pressure (pressure adjustment).
(3) Depressurized (pressure adjusted) saturated steam S11 is transferred to the heater 14 via the flow passage L11.
(4) The saturated steam S11 transferred to the heater 14 is heated by the heater 14 to generate superheated steam S12 of 100° C. or higher.
(5) The generated superheated steam S12 of 100° C. or higher is supplied to the fluidized bed vibration drying section 10 via the flow passage L12.
(6) In the fluidized bed vibration drying unit 10, the material to be dried is brought into contact with the superheated steam S12 and heated to dry the material to be dried.
(7) The superheated steam (or steam) S13 containing the organic solvent after the material to be dried is dried in the fluidized bed vibration drying unit 10 is transferred to the heat exchanger 17 via the flow passage L13.
(8) The superheated steam (or steam) S13 containing an organic solvent is heat-exchanged with the cooling water C1 in the heat exchanger 17 to be cooled and condensed to be condensed water.
(9) The condensed water S14 condensed by the heat exchanger 17 is transferred to and stored in the condensed water tank 18 via the flow passage L14.

Next, with reference to FIG. 3, the outline of the operation of the fluidized bed vibration drying unit 10 in the powdery-particle drying apparatus 1 will be described.
FIG. 3 is a diagram for explaining the outline of the operation of the fluidized bed vibration drying unit 10 in the powder and granular material drying device 1. In the first embodiment, for example, a case will be described in which an object to be dried is heated and dried with superheated steam of 100° C. or higher.

  In the first embodiment, for example, the material to be dried M1 is an example of powder or granules (allowable temperature 100° C. or higher) containing an organic solvent having a boiling point of 100° C. or higher.

(1) First, as shown in FIG. 3A, the material to be dried M1 is placed on the material to be dried receiving rack 107 and accommodated in the tubular container 105.
Next, the vibration motor 103 is rotated to vibrate (V) the cylindrical container 105 to vibrate the material to be dried M1, and the superheated steam S12 is supplied to the superheated steam receiver 104 via the flow passage L12. Then, the superheated steam S12 is passed through the drying target receiving rack 107 into the drying target M1.
As a result, the object to be dried M1 jumps up due to the vibration (V), and the superheated steam S11 passes through the object to be dried M1 that has jumped up to become overheated steam (or steam) S13.
At this time, it is preferable that the supply of the superheated steam S11 and the vibration (V) of the cylindrical container 105 start at the same time.
Whether or not the vibration (V) of the cylindrical container 105 and the supply of the superheated steam S11 are started at the same time can be arbitrarily set.
(2) Next, as shown in FIG. 3(B), on the article receiving shelf 107, the superheated steam S11 is jumped up by the vibration (V) and the superheated steam S11 passes therethrough to become the fluid article M2 to be dried. The material to be dried M2 in a fluid state and the superheated steam S11 can come into contact with each other.
(3) Next, as shown in FIG. 3(C), a fluidized bed (fluidized material to be dried) M3 of the material to be dried is formed in the cylindrical container 105 by vibrating (V) and passing the superheated steam S12. While being stably formed, the fluidized material to be dried M3 contacts the superheated steam S11 efficiently and stably.

Next, with reference to FIG. 3(C) and FIG. 4, the operation of drying the granular material or the like constituting the material to be dried will be described. FIG. 4 is a conceptual diagram for explaining the action when the powder or the like constituting the material to be dried M1 is dried in the fluidized bed M3 shown in FIG. 3(C).
(1) In the cylindrical container 105, when the superheated steam S12 passes through the fluidized bed M3 of the material to be dried, the powdered particles (particles) or the like forming the material to be dried M3 are sufficiently brought into contact with each other.
(2) When the powder or granules (particles) or the like forming the material to be dried M3 come into contact with the superheated steam S12, the superheated steam S12 is condensed on the surface of the powder or granules, and surface water is generated on the surface of the powder or granules. At the same time, latent heat is generated.
As a result, the generated latent heat removes the organic solvent on the surface of the granular material, and the latent heat is thermally conducted to the inside of the granular material to heat the inside of the granular material. The internal solvent) is evaporated and removed from the surface of the granular material.
(3) Further, the surface water adhered to the surface of the granular material is evaporated and removed because the superheated steam is condensed and generated.
(4) As a result, a granular material or the like containing no internal solvent or having the internal solvent reduced to a desired content is produced.
The mechanism of evaporation of the surface water adhering to the surface of the granular material and the internal solvent and the order of evaporation of the organic solvent have not been completely elucidated, so some parts are presumed.

According to the granular material drying device 1 according to the first embodiment, the material to be dried M1 containing the organic solvent is housed in the cylindrical container 105, and the material to be dried M1 is fluidized in the cylindrical container 105. Forming a fluidized bed M3 of the material to be dried, contacting the material to be dried M1 with superheated steam S12 in the fluidized bed M3 to condense the superheated steam S12, and the material to be dried M1 by latent heat when the superheated steam S12 is condensed. To heat.
As a result, it is possible to efficiently remove the organic solvent (internal solvent) contained in the powder or granular material that constitutes the material to be dried M1.

  According to the granular material drying device 1 of the first embodiment, by vibrating the cylindrical container 105, the material to be dried M1 containing the organic solvent can be made to jump and efficiently fluidized.

Moreover, according to the granular material drying apparatus 1 which concerns on 1st Embodiment, the fluidized bed M3 of a to-be-dried material can be stabilized by letting the to-be-dried material jump and the superheated steam S12 pass.
As a result, in the fluidized bed M3 of the material to be dried, the material to be dried can be efficiently brought into contact with the superheated steam S12 and dried efficiently and stably. Further, it is possible to efficiently take out the granular material or the like from the material to be dried M1.

<Second Embodiment>
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 5: is a figure explaining schematic structure of the granular material drying apparatus which concerns on 2nd Embodiment of this invention, An example of schematic structure of the granular material drying apparatus which dries the to-be-dried material with the superheated steam of decompression state. FIG. In FIG. 5, reference numeral 2 indicates a powdery-particle drying apparatus.

  In the second embodiment, for example, the material to be dried M1 is an example of a powder or pellet containing an organic solvent having a boiling point of less than 100°C (allowable temperature less than 100°C).

  As shown in FIG. 5, the powdery or granular material drying device 2 reduces the pressure of the fluidized bed vibration drying unit 10, the steam supply source S for supplying saturated steam, and the saturated steam S0 supplied from the steam supply source S, for example. Pressure reducing valve 11, temperature reducer 13 for reducing the temperature of saturated steam, first stop valve 211 for controlling the flow of saturated steam, reduced temperature water supply source W for supplying reduced temperature water to the temperature reducer 13, and reduced temperature water A second stop valve 212 for controlling the flow of water, a heater (superheated steam generator) 14, a reduced temperature water tank 15, a vacuum pump (pressure reducing means) 16, a heat exchanger 17, a condensed water tank 18, And a control unit (not shown).

Further, the control unit fluidizes the material to be dried contained in the fluidized bed vibration drying unit 10 to form a fluidized bed in the powdery or granular material drying device 2, and the material to be dried is formed in the fluidized bed vibration drying unit 10. Is contacted with depressurized superheated steam to dry the material to be dried at a temperature of less than 100°C.
The pressure reducing valve 11 is the same as that in the first embodiment, so the same reference numerals are given and the description thereof is omitted.

  The desuperheater 13 is connected to the pressure reducing valve 11 via the flow passage L21, is connected to the reduced temperature water supply source W via the flow passage L31, and is saturated steam supplied via the flow passage L21. The reduced temperature water W0 supplied through the flow passage L31 is brought into contact with S21 by a shower to reduce the temperature of the saturated steam S0 (temperature decrease).

  A first stop valve 122 is arranged in the flow passage L21, and by operating the first stop valve 122 to open and close, it is possible to control the flow of saturated steam depressurized by the pressure reducing valve 11 to the desuperheater 13. It is said that.

  Further, a second stop valve 123 is arranged in the flow passage L31, and by operating the second stop valve 123 to open and close, it is possible to control the flow of the reduced temperature water W0 supplied from the reduced temperature water supply source W. It is growing up.

  Further, the desuperheater 13 is connected to the heater 14 via the flow passage L22, and transfers the dehumidified steam to the heater 14 via the flow passage L22. Further, the heater 14 is depressurized by the vacuum pump 16, so that the inside of the temperature reducer 13 is also depressurized.

  The heater 14 is connected to the vacuum pump 16 through the flow passage L23, the fluidized bed vibration drying section 10, the flow passage 24, the heat exchanger 17, the flow passage L25, the condensed water tank 18, and the flow passage L26, and is connected to the vacuum pump 16. By operating the pump 16, the inside of the heater 14 can be depressurized.

  Further, the heater 14 is connected to the desuperheater 13 via the flow passage L22, and heats the saturated steam S22 supplied via the flow passage L22 in a depressurized state. It is designed to produce superheated steam that condenses at temperatures below °C.

As a result, in order to maintain the performance and quality of the granular material or the like constituting the material to be dried, it is necessary to dry the material to be dried at a desired target heating temperature of less than 100° C. It is possible to ensure efficient performance and quality and to dry efficiently.
Here, the target heating temperature, for example, when taking out the powder or granules from the material to be dried, refers to the desired temperature as a target, the temperature based on the physical or chemical properties of the powder or granules, the desired margin to them. It means the temperature etc.

  The fluidized bed vibration drying unit 10 is connected to the heater 14 via the flow passage L23, and the material to be dried contained therein is supplied from the heater 14 via the flow passage L23 in a reduced pressure state. The material to be dried is dried by bringing it into contact with superheated steam S22 of less than 100°C. The details of the fluidized bed vibration drying unit 10 are the same as those in the first embodiment, and thus the description thereof is omitted.

  The heat exchanger 17 is connected to the fluidized bed vibration drying unit 10 by the flow passage L24, and the steam containing the organic solvent in a reduced pressure flowing from the fluidized bed vibration drying unit 10 via the flow passage L24, The cooling water C1 supplied through the cooling water supply passage is heat-exchanged with the cooling water C1 to be cooled, and the water vapor containing the organic solvent is condensed to generate condensed water.

  In addition, the heat exchanger 17 is provided with a sufficient heat exchange capacity for water vapor containing the organic solvent flowing from the fluidized bed vibration drying section 10, so that the organic solvent contained in the material to be dried can be sufficiently recovered. It is preferable to configure.

  The condensed water tank 18 is connected to the heat exchanger 17 via the flow passage L25, and receives and stores the condensed water S25 condensed in the heat exchanger 17 via the flow passage L25. ..

  The vacuum pump 16 is connected to the condensed water tank 18 via the flow passage L26, sucks the inside of the condensed water tank 18 via the flow passage L26 to suck and discharge the gas G26, and the condensed water tank 18, The pressure inside the heat exchanger 17, the fluidized bed vibration drying unit 10, the heater 14, the desuperheater 13 and the dehumidified water tank 15 is reduced. A well-known vacuum pump can be used as the vacuum pump 16.

The reduced-temperature water tank 15 is connected to the temperature reducer 13 via the flow passage L32, and the reduced-temperature water W1 after the saturated steam is reduced in temperature in the temperature reducer 13 is transferred via the flow passage L32. It is like this.
Further, in the reduced temperature water tank 15, when the heater 14 is depressurized by the vacuum pump 16, the inside of the reduced temperature water tank 15 is also depressurized.
Further, the reduced-temperature water tank 15 is provided with a reduced-temperature water discharge valve 15V so that the reduced-temperature water in the reduced-temperature water tank 15 can be discharged by maintaining the depressurized state of the reduced-temperature water tank 15. ing.

Hereinafter, with reference to FIG. 5, an operation procedure of the powdery or granular material drying device 2 will be described.
(1) First, in FIG. 5, the first stop valve 111 is opened, the saturated steam S0 is introduced from the steam supply source S, and the pressure is reduced by the pressure reducing valve 11 to generate the saturated steam S21.
Further, the second stop valve 212 is opened to take in the reduced temperature water W1 from the reduced temperature water supply source W.
In addition, the vacuum pump 16 is operated to bring the inside of the system of the powdery or granular material drying device 2 into a depressurized state.
(2) In the desuperheater 13, the saturated steam S21 decompressed by the decompression valve 11 is brought into contact with the dehumidified water W0 supplied from the dehumidified water supply source W in a depressurized state to generate saturated steam S22 of less than 100°C.
The reduced-temperature water W1 that has been used for reducing the temperature is transferred to and stored in the reduced-temperature water tank 15 while maintaining the reduced pressure state.
(3) The generated reduced temperature saturated steam S22 is transferred to the heater 14 and heated to a temperature of less than 100° C. under reduced pressure to generate superheated steam S23 of less than 100° C.
(4) The generated superheated steam S23 of less than 100° C. is supplied to the fluidized bed vibration drying section 10 through the flow passage L23 while maintaining the reduced pressure state.
(5) In the fluidized bed vibration drying unit 10, the material to be dried is brought into contact with the superheated steam S23 under reduced pressure to heat the material to be dried.
(6) The superheated steam (or steam) S24 containing the organic solvent after drying the material to be dried in the fluidized bed vibration drying unit 10 is passed through the flow passage L24 while maintaining the reduced pressure state and the heat exchanger 17 Transfer to.
(7) The superheated steam (or steam) S24 containing an organic solvent is heat-exchanged with the cooling water C1 in the heat exchanger 17 to be cooled and condensed to be condensed water.
(8) The condensed water S25 condensed by the heat exchanger 17 is transferred to and stored in the condensed water tank 18 via the flow passage L25.
(9) The air in the condensed water tank 18 is sucked into the vacuum pump 16 via the flow passage L26 and discharged as the gas 26.

The operation of the fluidized bed vibration drying unit 10 in the powder-and-particles drying device 2 is the same as that of the first embodiment except that the reference numerals S23 and S24 are used in place of the reference numerals S12 and S13 in FIG.
The operation of drying the powder or granules or the like that constitutes the material to be dried is the same as that in the first embodiment, and therefore the description thereof is omitted.

According to the granular material drying device 2 of the second embodiment, the material to be dried M1 containing the organic solvent is housed in the cylindrical container 105, and the material to be dried M1 is fluidized in the cylindrical container 105. The fluidized bed M3 of the material to be dried is formed, and the material M1 to be dried is contacted with the superheated steam S23 in the fluidized bed M3 to condense the superheated steam S23, and the material to be dried M1 is latently heated when the superheated steam S23 is condensed. To heat.
As a result, it is possible to efficiently remove the organic solvent (internal solvent) contained in the powder or granular material that constitutes the material to be dried M1.

  According to the granular material drying device 2 of the second embodiment, by vibrating the cylindrical container 105, the material to be dried M1 containing an organic solvent can be made to jump and efficiently fluidized.

Further, according to the granular material drying device 2 according to the second embodiment, the fluidized bed M3 of the material to be dried can be stabilized by passing the superheated steam S23 in a state where the material to be dried jumps.
As a result, in the fluidized bed M3 of the material to be dried, the material to be dried can be efficiently brought into contact with the superheated steam S23 to be dried efficiently and stably. Further, it is possible to efficiently take out the granular material or the like from the material to be dried M1.

  According to the granular material drying device 2 of the second embodiment, the material to be dried M1 is heated and dried at the target heating temperature of less than 100° C. by depressurizing the inside of the cylindrical container 105. It is possible to produce a high-quality powder or granular material by suppressing the deterioration of the performance or quality of the powder or granular material or the like constituting the.

  Although the powdery or granular material drying apparatuses 1 and 2 according to the first and second embodiments of the present invention have been described above, the present invention is not limited to this, and may be appropriately changed without departing from the technical idea thereof. It is possible.

  For example, in the first embodiment, the material to be dried M1 is a powder or pellet containing an organic solvent having a boiling point of 100° C. or more (allowable temperature of 100° C. or more), and in the second embodiment, the material to be dried M1 is Although the case of drying a powder or granules containing an organic solvent having a boiling point of less than 100°C (allowable temperature less than 100°C) has been described, for example, a powder or granules containing an organic solvent having a boiling point of 100°C or more. A combination of the material to be dried M1 (the allowable temperature is less than 100° C.) and the material to be dried M1 such as a powdery material or a pellet (an allowable temperature of 100° C. or more) containing an organic solvent having a boiling point less than 100° C. Can be set arbitrarily.

  Further, in the above-described embodiment, the case where the granular material or the like constituting the material to be dried M1 includes the internal solvent has been described, but, for example, in addition to the organic solvent, a substance other than the organic solvent such as water is included. It may be applied to the material to be dried.

Further, in the above embodiment, the case where the powdery or granular material drying devices 1 and 2 include the vibration motor 103 has been described, but the vibration motor 103 may not be included.
Further, instead of the vibration motor 103, another cylindrical container vibrating means may be used.

  Further, in the above embodiment, the case where the application of vibration (V) through the tubular container 105 and the supply of the superheated steam S12 and S23 are simultaneously started to the fluidized bed vibration drying unit 10 has been described. Whether to apply the vibration (V) to the fluidized bed vibration drying section 10 through the cylindrical container 105 and to supply the superheated steam S12 and S23 at the same time can be arbitrarily set.

  Moreover, in the said embodiment, although the powder-and-particles drying apparatus 2 demonstrated the case where the vacuum pump 16 suck|inhales the superheated steam from the fluidized-bed vibration drying part 10 grade|etc., Suction means other than a pump may be used.

  According to the drying method and the drying apparatus of the present invention, the material to be dried containing the organic solvent can be efficiently dried, and thus it is industrially applicable.

S Water vapor supply source W Reduced temperature water supply source 1, 2 Powder drying device (drying device)
10 Fluidized Bed Vibration Dryer 13 Desuperheater 14 Heater (Superheated Steam Generator)
16 Vacuum pump 103 Vibration motor (cylindrical container vibration means)
105 cylindrical container

Claims (6)

A method for drying a material to be dried containing an organic solvent,
The superheated steam receiving portion is placed on the dried object receiving rack arranged between the superheated steam receiving portion of the tubular container in which the superheated steam receiving portion is arranged below ,
By applying vibration to the tubular container, a fluidized bed in which the material to be dried jumps in the tubular container is formed, and superheated steam is introduced into the tubular container from the superheated steam receiver. , drying method, characterized in that the said let jumping superheated steam in contact with the material to be dried, the drying by heating the material to be dried while condensing said superheated steam. The drying method according to claim 1, wherein
Superheated steam depressurized to a predetermined pressure or less flows into the cylindrical container, and the depressurized superheated steam and the material to be dried fluidized by jumping are brought into contact with each other under reduced pressure to heat the material to be dried. And a drying method comprising: drying. The drying method according to claim 2, wherein
A drying method, characterized in that the inside of the cylindrical container is decompressed so that the superheated steam in the cylindrical container is condensed at a temperature equal to or lower than a target heating temperature of the material to be dried. A drying device for drying a material to be dried containing an organic solvent,
A tubular container in which a superheated steam receiving section is arranged below, and a dried article receiving shelf for placing the dried article between the superheated steam receiving section is arranged ,
An overheated steam generation unit that generates overheated steam,
A cylindrical container vibrating means for vibrating the cylindrical container,
A control unit,
Equipped with
The control unit is
By vibrating the cylindrical container by the cylindrical container vibrating means, the material to be dried is fluidized in a state of jumping in the cylindrical container to form a fluidized bed, and superheated steam is introduced into the fluidized bed. The drying device is characterized in that the superheated steam is brought into contact with the material to be dried, and the material to be dried is heated and dried while condensing the superheated steam. The drying apparatus according to claim 4 ,
The control unit is
The superheated steam pressure was reduced to or below a predetermined pressure flows into the cylindrical container, and the material to be dried which is fluidized let jumping superheated water vapor the decompression in contact under a reduced pressure, the material to be dried A drying device characterized by heating and drying. The drying apparatus according to claim 5 ,
The control unit is
A drying apparatus, which reduces the pressure in the tubular container so that the superheated steam in the tubular container condenses at a temperature equal to or lower than a target heating temperature of the material to be dried.

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