JP6482992B2 - Fluidized bed equipment - Google Patents

Description

  The present invention relates to a fluidized bed apparatus for granulating, coating, and drying powder particles that flow in a processing vessel.

  A fluidized bed apparatus generally performs granulation, coating, drying, etc. while forming a fluidized bed by floating and flowing powder particles in a processing vessel with a fluidized gas introduced from the bottom of the processing vessel. Yes, it is widely used in fields such as food industry and pharmaceutical industry. The fluidized bed apparatus includes a rolling fluidized bed apparatus in which a rotating body is disposed at the bottom of the fluidized bed processing container and a composite fluidized bed represented by a Wurster fluidized bed apparatus in which a draft tube is installed inside the fluidized bed processing container. A device is also included.

  Some of the flow devices as described above visually confirm the inside of the processing container through a light-transmitting window such as a glass window provided on the side wall of the processing container (for example, Patent Document 1).

  In addition, when performing processing such as granulation, coating, drying, etc. of granular particles using a fluidized bed apparatus, for the purpose of controlling the processing conditions of the object to be processed, determining the processing end point, etc., through a translucent window In some cases, an object to be processed (powder particles) inside the apparatus is measured, monitored, or the like.

  Further, an invention has already been made to eject particles to such a light transmitting window to remove particles adhering or depositing on the surface of the light transmitting window.

  For example, in the fluidized bed apparatus of Patent Document 2, a processing container for monitoring the inside of the apparatus with a sensor through a glass window is disclosed, and a slit provided by cutting out a part of a cover member provided protruding from the inside of the container. From this, powder is prevented from adhering to the glass window by jetting air to the glass window.

  Moreover, in the fluidized bed apparatus of patent document 3, the particle | grains deposited on the particle | grain capture | acquisition part can be measured with an optical sensor through a translucent window, and the deposited particle | grains are injected into the particle | grain capture | acquisition part from an air chamber. Is removed from the particle trapping part and returned to the fluidized bed.

JP 2005-13943 A Actual No. 2582891 Publication JP 2013-71104 A

  In the invention disclosed in Patent Document 2, the slit of the cover member opens toward the inside of the container even when air is not blown, and powder enters the slit. In addition, there is a problem that the entrance of the powder blocks the slit and prevents the ejection of air, and the problem that the cleaning work for removing the powder that has entered the slit becomes complicated.

  In the invention disclosed in Patent Document 3 as well, since the air spout is always opened to the inside of the apparatus, powder easily enters the air spout, and the air spout is blocked and the cleaning operation is complicated. There is a problem of crystallization.

  Under such circumstances, in the present invention, a fluidized bed apparatus capable of removing particulate particles adhering to a light-transmitting window such as a glass window provided in a processing vessel and preventing particles from entering the air jet port. The issue is to provide.

  In order to solve the above-described problems, the present invention includes a processing container and a light-transmitting window attached to a side wall of the processing container, introduces a fluidized gas into the processing container, and generates powder in the processing container. In the fluidized bed apparatus that performs at least one of granulation, coating, and drying while forming a fluidized bed by floating and flowing granular particles, the translucent window is connected to the processing container via a frame-shaped member. The translucent window includes a translucent member, and a seal member interposed between the translucent member and the frame-shaped member, and the seal member includes the translucent member. A base portion that opposes the outer peripheral surface with a predetermined interval; an outer portion that extends from an end of the base portion on the outer side of the processing container toward the translucent member; and contacts an outer surface of the translucent member; The light transmitting member extends from the end of the base on the inner side of the processing container to the light transmitting member. A lip portion that contacts an inner surface of the material, and at least the lip portion is formed of an elastic material, and an outer peripheral surface of the translucent member, the base portion, the outer portion, and the lip portion of the seal member. An air chamber is formed between the air chamber and an air supply port for supplying compressed air to the air chamber, and the lip portion is formed of the compressed air supplied into the air chamber. An opening gap that leads to the inside of the processing container from the air chamber is formed between the inner surface of the translucent member and elastically deformed by pressure.

  In the fluidized bed apparatus of the present invention, the lip portion and the translucent member are elastically deformed by the pressure of the compressed air supplied into the air chamber only when the compressed air is jetted to the inner surface side of the processing container. In the meantime, an opening gap, which is an air outlet, is formed. That is, the opening gap is closed except when compressed air is ejected. For this reason, intrusion of the granular particles into the opening gap is prevented, and obstruction of the opening gap due to entry of particles and complication of the cleaning operation inside the processing container can be prevented.

It is a figure showing an example of 1 composition of a fluid bed apparatus concerning an embodiment. It is an enlarged view of the diameter reduction part of the processing container in the fluidized bed apparatus of the example of 1 structure shown in FIG. It is the perspective view which showed a mode that the translucent window was attached to a frame-shaped member. It is sectional drawing of a translucent window and a frame-shaped member. It is the perspective view which looked at the translucent window from the outside of the fluidized bed apparatus. It is sectional drawing which shows a mode that compressed air is ejected. It is a perspective view which shows a mode that compressed air is ejected. It is a perspective view which shows the structure of a translucent window.

  Hereinafter, embodiments according to the present invention will be described with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the part which is the same or it corresponds, The duplication description is simplified or abbreviate | omitted suitably.

  First, based on FIG. 1, the structure of the fluidized bed apparatus 1 which concerns on embodiment is demonstrated. An air supply chamber 5 for introducing a fluidizing gas F such as hot air into the processing container 2 is provided at the lower end of the fluidized bed apparatus 1, and is formed by the fluidizing gas F in the processing container 2. A spray nozzle 6 that sprays a spray liquid toward the fluidized bed and that can move up and down is provided. In addition, a reduced diameter portion 3 whose cross-sectional area is gradually reduced in diameter is provided at the lower portion of the processing container 2, and a particle measuring portion 4 that measures a physical property value of the granular particles M is provided on a side wall of the reduced diameter portion 3. Is provided.

  Next, details will be described by taking as an example a case where granulation is performed using the fluidized bed apparatus 1. In addition, although the case where granulation is performed is mentioned here as an example, the fluidized bed apparatus according to the present invention can be used for processes other than granulation such as coating and drying.

  First, the fluidizing gas F is introduced from the air supply chamber 5 into the processing container 2 through a gas dispersion plate (not shown). Here, as the gas dispersion plate, a perforated plate such as a punching metal or a wire mesh can be used.

  Due to the fluidized gas F introduced, a fluidized bed of powder particles M is formed in the processing vessel 2. Then, a spray liquid such as a binder liquid is sprayed from the spray nozzle 6 to the granular particles M that float and flow in the processing container 2. The powder particles M are wetted, adhered, agglomerated and dried by spraying the spray liquid. By repeating this adhesion condensation in the fluidized bed, the granular particles M grow into particles having a predetermined particle diameter.

  For the granular particles M that grow in particle size in the fluidized bed, for example, the physical property value of the granular particles M is measured by the particle measuring unit 4 for the purpose of controlling processing conditions and determining the processing end point. . In addition, the measurement of the physical property value of the granular particles M by the particle measuring unit 4 is performed while maintaining the floating flow state of the granular particles M in the processing container 2.

  Next, the structure of the particle | grain measuring part 4 which performs the physical-property value measurement of the granular material particle | grains M is demonstrated based on FIG.

  As shown in FIG. 2, the particle measuring unit 4 provided in the reduced diameter portion 3 of the processing container 2 deposits and captures a part of the granular particles M that float and flow in the processing container 2. C and the optical sensor 20 that measures the physical property value of the granular particles M captured by the particle capturing unit C from the outer surface side of the processing container 2. The particle trapping part C and the optical sensor 20 are fixed to the reduced diameter part 3 of the processing container 2 by a clamp 21. The particle trapping part C has a configuration described below, and is attached to the opening of the reduced diameter part 3 while being pressed by the clamp 21.

  Next, the translucent window 10 according to the embodiment of the present invention and the surrounding configuration will be described.

  The frame-shaped member 11 is attached to the side wall of the processing container 2. And as shown in FIG. 3, the translucent window 10 is attached to the side wall of the processing container 2 by fitting the translucent window 10 in the attachment hole 111 of the frame-shaped member 11. As shown in FIG. The translucent window 10 is interposed between the translucent member 12 formed of a transparent member such as transparent glass or resin, and between the translucent member 12 and the frame member 11, and seals the gap between these members. A seal member 13 is provided. In the present embodiment, the translucent member 12 has a circular shape, but may have other shapes, for example, a polygonal shape such as a quadrangle or an elliptical shape. FIG. 3 schematically shows a part of the frame-shaped member 11.

  FIG. 4 is a cross-sectional view showing a state where the transparent window 10 is attached to the frame-shaped member 11. The seal member 13 extends from the outer peripheral surface 121 of the translucent member 12 to the translucent member 12 from the outer end of the processing container 2 of the base 131 facing the outer peripheral surface 121 of the translucent member 12 with a predetermined interval. An outer portion 132 that contacts the outer surface 122 of the translucent member 12, and a lip that extends from the inner end of the base 131 to the translucent member 12 and contacts the inner surface 123 of the translucent member 12. Part 133. The translucent member 12 is sandwiched between the outer portion 132 and the lip portion 133 of the seal member 13. The translucent window 10 is attached to the frame member 11 by fitting the outer peripheral surface of the base 131 and a part of the lip 133 into the side wall of the frame member 11. The lip part 133 is formed with a smaller thickness than the outer part 132. The lip 133 is formed of an elastic material and is elastically deformed by the pressure of compressed air described later. In the present embodiment, the seal member 13 includes a base portion 131, an outer portion 132, and a lip portion 133 that are integrally formed.

  A concave particle capturing portion C is formed by the inner surface 123 of the translucent member 12 and the inner periphery of the inclined surface 133b provided on the lip portion 133 of the seal member 13. By providing the concave particle capturing portion C, it is possible to deposit and capture the amount (thickness) of powder particles M necessary for the physical property value measurement in this portion.

  An air chamber 14 that is a space to which compressed air is supplied is provided along the outer peripheral surface 121 of the translucent member 12. The air chamber 14 is a space formed by the outer peripheral surface 121 of the translucent member 12 and the inner surfaces of the base portion 131, the outer portion 132, and the lip portion 133 of the seal member 13.

  FIG. 5 is a perspective view of the translucent window 10 as seen from the outside. As shown in FIG. 5, an air supply port 141 that communicates with the air chamber 14 from the outside of the seal member 13 is provided in a part of the outer portion 132. By supplying compressed air (air) from an air supply port 141 by an air supply means (not shown), the compressed air flows through the air chamber 14 in the circumferential direction of the light-transmitting window 10 (in the direction of the arrow in FIG. 5). 14 is fully filled. Note that a plurality of air supply ports may be provided in the seal member 13.

  When a certain amount or more of compressed air is supplied into the air chamber 14, as shown in FIG. 6A, the compressed air presses each surface forming the air chamber 14 such as the inner surface of the lip portion 133. . And when the said pressing force exceeds a predetermined value, as shown in FIG.6 (b), the edge part 133a by the side of the translucent member 12 of the lip part 133 will elastically deform to the inner side of the processing container 2, Between the lip part 133 and the translucent member 12, an opening gap 15 which is an air outlet is formed. Thereby, the compressed air in the air chamber 14 flows from the opening gap 15 to the inside of the processing container 2 and is ejected along the inner side surface 123 of the translucent member 12.

  As shown in FIG. 7, the compressed air is ejected from the opening gap 15 formed over the entire circumference of the translucent member 12 toward the inner diameter direction of the translucent member 12 (arrow direction in FIG. 7). A turbulent airflow is formed by collision near the center of the inner surface 123 of the optical member 12 (see FIG. 6b). Due to the turbulent air flow formed by such compressed air, the granular particles M deposited on the inner side surface 123 of the translucent member 12 are rolled up to the inner side of the processing container 2 and removed from the particle trapping part C, and the fluidized bed. You can return to Further, by rewinding the blown up turbulent air, new powder particles M can be taken into the particle trapping part C from the fluidized bed side, and new powder particles M by the optical sensor 20 (see FIG. 2). Can be measured. In particular, in this embodiment, since compressed air can be ejected from the entire outer periphery of the translucent member 12, the particulate particles M deposited on the entire inner surface 123 of the translucent member 12 are rolled up to trap the particles. It can be effectively removed from the part C.

  When the supply of compressed air from the air supply port 141 is stopped, the force by which the compressed air in the air chamber 14 presses the lip 133 is released, and the lip 133 is elastically restored to its original shape, and the lip 133 is transparent. It contacts the inner surface 123 of the optical member 12 again, and the opening gap 15 is closed. As described above, only when the compressed air is ejected, the opening gap 15 that is an ejection port for ejecting the compressed air is formed between the lip 133 and the translucent member 12, except when the compressed air is ejected. Since the opening gap 15 is closed, it is possible to prevent the powder particles M inside the processing container 2 from entering the opening gap 15.

  As an example of another configuration of the seal member 13, as shown in FIG. 8, in this embodiment, the seal member 13 is formed by an inner packing 16 and an outer packing 17. The inner packing 16 has a base portion 131 and a lip portion 133 (see FIG. 4), which are integrally formed of an elastic material. The outer packing 17 is made of an elastic material and has an outer portion 132. The translucent window 10 is formed by the inner packing 16 and the outer packing 17 sandwiching the translucent member 12.

  Next, the measuring method of the physical property value of the granular material particle | grains M by the particle | grain measuring part 4 is demonstrated using FIG.

  The granular particles M deposited and captured in the particle capturing unit C are captured by the particle capturing unit C in a state having a predetermined deposition thickness depending on the thickness of the frame-shaped member 11. Thereby, the measurement accuracy of the physical property value by the optical sensor 20 is improved, and the variation in data can be reduced. Here, the thickness of the frame-shaped member 11 is preferably variable by changing to a frame-shaped member having a different thickness.

  Various physical property values such as moisture content and component content (component concentration) are measured by the optical sensor 20 for the granular particles M captured by the particle capturing section C and deposited at a predetermined thickness. The light projecting unit and the light receiving unit of the optical sensor 20 are in a positional relationship such that the reflected light of the measurement light projected from the light projecting unit (the reflected light reflected from the inner surface of the transparent window 10) is not received by the light receiving unit. ing. For example, the optical axis of the light projecting unit and the optical axis of the light receiving unit are shifted from each other by a predetermined angle in the range of 3 to 30 °.

  The measured data (various physical property values) is transmitted to an arithmetic processing unit (not shown) via a transmission means such as an optical fiber, and the spectral analysis of the reflected light reflected from the granular particles M by the arithmetic processing unit is performed. Done. And the physical property value of the granular material particle | grain M is calculated | required based on this spectrum analysis.

  Here, the optical sensor 20 is preferably a near infrared sensor. By using a near-infrared sensor, not only the physical properties indicating the morphological properties such as the particle size of the granular particles M but also the elution such as the compositional properties such as the component content and moisture content and the coating amount of the coating component on the core particles It is also possible to measure physical property values representing chemical properties such as performance.

  After the measurement of the physical property values, the granular particles M are returned to the fluidized bed again by the compressed air ejected from the opening gap 15 described above, and new granular particles M are captured by the particle capturing unit C. Thus, the fall of the yield of a product can be suppressed by returning the granular material particle | grains M capture | acquired by the particle | grain capture part C to a fluidized bed again after a measurement.

  The embodiment of the present invention has been described above, but the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

  In the above description, the embodiment has been described in which particles deposited on the particle trapping part are measured by the particle measuring part through the light transmission window, and then the particles deposited by the gas ejected from the opening gap are removed. However, a fluidized bed apparatus may be used in which the particle capturing unit and the particles inside the processing container are continuously switched by gas ejection, and particles passing through the particle capturing unit are measured by the particle measuring unit. In addition, in a fluidized bed apparatus having a particle measuring unit that measures particles flowing inside the apparatus, gas can be ejected from an opening gap in order to remove particles adhering to the surface of the transparent window. Furthermore, it may replace with said particle | grain measuring part and the fluidized-bed apparatus which observes the inside of a processing container visually through a translucent window may be sufficient.

  The present invention can be applied to a composite fluidized bed apparatus represented by a rolling fluidized bed apparatus and a Wurster fluidized bed apparatus in addition to the normal fluidized bed apparatus shown in FIG.

DESCRIPTION OF SYMBOLS 1 Fluidized bed apparatus 2 Processing container 4 Particle | grain measuring part 10 Translucent window 11 Frame-shaped member 12 Translucent member 121 Outer peripheral surface 122 Outer side surface 123 Inner side surface 13 Seal member 131 Base part 132 Outer part 133 Lip part 14 Air chamber 141 Air supply port 15 Opening gap 20 Optical sensor C Particle capturing part

Claims (3)

A processing vessel, and a translucent window attached to a side wall of the processing vessel,
A fluidized bed apparatus for introducing at least one of granulation, coating, and drying while introducing a fluidized gas into the processing vessel and suspending and flowing powder particles in the processing vessel to form a fluidized bed. In
The translucent window is attached to a side wall of the processing container via a frame-shaped member,
The translucent window includes a translucent member, and a seal member interposed between the translucent member and the frame-shaped member,
The seal member extends to the translucent member side from a base portion facing the outer peripheral surface of the translucent member with a predetermined interval, and an end of the base on the outer side of the processing container. An outer portion that contacts the outer surface of the base, and a lip portion that extends from the inner end of the processing container to the side of the translucent member and contacts the inner surface of the translucent member; At least the lip portion is formed of an elastic material;
An air chamber is formed between the outer peripheral surface of the translucent member and the inner surface of the base portion, the outer portion, and the lip portion of the seal member, and an air supply for supplying compressed air to the air chamber There is a mouth,
The lip portion is elastically deformed by the pressure of the compressed air supplied into the air chamber, and forms an opening gap from the air chamber to the inside of the processing container between the inner surface of the translucent member. A fluidized bed apparatus. Fluidized bed apparatus according to claim 1, wherein said base and said lip portion of the sealing member are integrally formed of an elastic material.   The fluidized bed apparatus according to claim 1, wherein the air supply port is provided in the outer portion.

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