JP6472733B2 - 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. In the fluidized bed apparatus, a composite fluidized bed represented by a rolling fluidized bed apparatus in which a rotating body is disposed at the bottom of a fluidized bed processing container or a Wurster fluidized bed apparatus in which a draft tube is installed inside the fluidized bed processing container. A device is also included.

  A glass window provided in the fluidized bed apparatus for the purpose of controlling the processing conditions of the object to be processed, determining the processing end point, etc., when performing processing such as granulation, coating, and drying of the granular particles using the fluidized bed apparatus. In some cases, a physical property value of an object to be processed (powder particles) inside the apparatus is measured, monitored, or the like through a transparent window such as the above.

  An invention has already been made in which gas is ejected 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 1, a processing container that monitors the inside of the apparatus with a sensor through a glass window is disclosed, and a slit that is provided by cutting out a part of a cover member that protrudes from the inside of the container is provided. From this, the powder is prevented from adhering to the glass window by ejecting air to the glass window.

  Moreover, in the fluidized bed apparatus of patent document 2, 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.

Utility Model Registration No. 2582891 JP 2013-71104 A

  In the invention disclosed in Patent Document 1, the slit of the cover member opens toward the inside of the container even when air is not blown out, 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 2 as well, since the air jet is always opened to the inside of the apparatus, it is easy for powder to enter the air jet, and the air jet is blocked and the cleaning work is complicated. There is a problem of crystallization.

  Under such circumstances, an object of the present invention is to provide a fluidized bed apparatus that can prevent particles from entering the gas ejection port.

  In order to solve the above-mentioned problems, the present invention introduces a fluidized gas into a processing container, floats and flows powder particles in the processing container to form a fluidized bed, granulation, coating, and A fluidized bed apparatus that performs at least one treatment of drying, and includes a particle measuring unit that measures a physical property value of the powder particles in the processing container. A frame-shaped member for attaching the light-transmitting window to the side wall of the processing container, and measuring physical properties of the powder particles in the processing container from the outer surface side of the light-transmitting window through the light-transmitting window A gas jet nozzle having a gas jet nozzle for jetting gas toward the inner surface side of the translucent window, and the gas jet nozzle includes a cylindrical nozzle housing and an interior of the nozzle housing. Received and advanced in the axial direction of the nozzle housing A movable nozzle body and an operating mechanism for moving the nozzle body forward and backward, and the nozzle housing is attached to the frame-shaped member such that a front end surface thereof is flush with an inner surface of the frame-shaped member. The nozzle body includes a gas passage and the gas jet opening communicating with the gas passage and opening at a front end portion of the nozzle body, and the operating mechanism is configured such that the nozzle body is located on the inner side of the processing container. A forward movement position where the gas jet port is located on the inner side of the processing container with respect to the front end surface of the nozzle housing; and the nozzle body moves backward toward the outer side of the processing container; The nozzle body is accommodated between the retracted position that is accommodated in the nozzle housing and the front end surface of the nozzle body is flush with the front end surface of the nozzle housing and the inner surface of the frame-shaped member. It is possible to move.

  In the fluidized bed apparatus of the present invention, when the gas is ejected, the nozzle body can be moved to the forward position, and the gas can be ejected from the gas ejection port toward the light transmission window. Further, except during gas ejection, the nozzle body is moved to the retracted position, the front end portion of the nozzle body including the gas ejection port is accommodated in the nozzle housing, and the gas ejection port does not open on the inner surface of the container. Intrusion of particles into the gas outlet can be prevented. Furthermore, in the retracted position, the front end surface of the nozzle body, the front end surface of the nozzle housing, and the inner surface of the frame-shaped member are flush with each other so that the powder between the front end portion of the gas ejection nozzle and the frame-shaped member is aligned. Occurrence of stagnation 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 figure which looked at the particle capture part from the outside direction of a processing container. FIG. 4 is a cross-sectional view taken along the line A-A ′ of FIG. 3. It is the schematic explaining the winding of the particle | grains in a particle | grain capture part. It is sectional drawing explaining the structure of a control member.

  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 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.

  Below, the structure of the particle | grain measuring part 4 which measures the physical-property value of the granular material particle | grains M is demonstrated based on FIGS.

  The particle measuring unit 4 is provided in the reduced diameter portion 3 of the processing container 2, a light transmission window 10, a frame-like member 11 for attaching the light transmission window 10 to the side wall 3 a of the reduced diameter portion 3 of the processing container, and a processing The optical sensor 20 that measures the physical property values of the granular particles M in the container 2 from the outer surface side of the light transmitting window 10 through the light transmitting window 10, and gas is ejected toward the inner surface side of the light transmitting window 10. And a gas ejection nozzle 13 having a gas ejection port 451.

  3 and 4 show the configuration of the periphery of the translucent window 10, the gas ejection nozzle 13, and the like. FIG. 3 is a view {a view in the direction of the arrow X in FIG. 4) of the translucent window 10 and the gas ejection nozzle 13 as viewed from the outer surface side direction of the processing container 2. 4 is a cross-sectional view taken along the line A-A 'of FIG.

  As shown in FIGS. 3 and 4, the translucent window 10 is formed of a transparent material such as transparent glass or a resin material, and is fixed to the frame-shaped member 11 via the holding member 12. In addition, gas ejection nozzles 13 are attached to the frame-shaped member 11 at positions facing each other with the light transmission window 10 in between. The frame-like member 11 is attached to a pedestal portion 3a1 provided on the side wall 3a of the reduced diameter portion 3 of the processing container 2 by an appropriate means such as a bolt. The translucent window 10 may be directly held by the frame-shaped member 11 without using the holding member 12.

  The holding member 12 is formed of a metal material or the like, and holds the translucent window 10 from the outer peripheral side. The holding member 12 is fixed to the frame-shaped member 11 by four bolts 31. Further, the gas ejection nozzle 13 is fixed to the frame-shaped member 11 by hexagon socket bolts 32 provided on both sides thereof. Further, the frame-shaped member 11 is fixed to the side wall 3 a (the pedestal portion 3 a 1) of the reduced diameter portion 3 of the processing container 2 by four bolts 33.

  As shown in FIG. 4, the inner surface 101 of the translucent window 10 and the inner surface 121 of the holding member 12 are provided flush with each other. The inner surface 111 of the frame-shaped member 11 is provided at a position one step down from the inner surface 101 of the translucent window 10 and the inner surface 121 of the holding member 12 to the inner side of the processing container 2. A particle trapping part C is formed. By providing the concave particle capturing portion C, it is possible to capture the amount (thickness) of the granular particles M required for the physical property measurement in this portion. The inner surface 111 of the frame member 11 is provided flush with the inner surface 3b of the side wall 3a (pedestal portion 3a1) of the reduced diameter portion 3 of the processing container 2.

  Next, the configuration of the gas ejection nozzle 13 will be described.

  The gas ejection nozzle 13 includes a cylindrical nozzle housing 40, a nozzle body 41 accommodated in the nozzle housing 40, and an elastic spring 42 as an elastic member interposed between the nozzle housing 40 and the nozzle body 41. The nozzle cap 43 is mounted from above the nozzle housing 40, the joint 44, and the like. The gas ejection nozzle 13 is attached to the frame-shaped member 11 via a plurality of O-rings such as an O-ring 34.

  The nozzle body 41 communicates with the gas passage 45 and the gas passage 45 and opens at the front end portion of the nozzle body 41 (the portion inside the reduced diameter portion 3 of the processing vessel 2 of the nozzle body 41). And are provided. The gas outlet 451 opens from the gas passage 45 in the radial direction of the nozzle body 41. Further, a branch passage 452 that branches to both sides of the nozzle body 41 in the radial direction is provided in the middle of the gas passage 45 in the axial direction. The gas passage 45 is a passage having a diameter of about 2 mm, for example.

  The nozzle main body 41 is provided so as to be capable of moving forward and backward in the axial direction (vertical direction in the figure) with respect to the nozzle housing 40, and is moved forward (in FIG. 4) to the inside of the reduced diameter portion 3 of the processing container 2. The position of the gas jet nozzle 13 on the left side) and a retracted position (position of the gas jet nozzle 13 on the right side in FIG. 4) retracted to the outside of the reduced diameter portion 3 of the processing container 2 are provided. . FIG. 4 shows an example in which one gas ejection nozzle 13 is located at the forward position and the other is at the backward position for convenience. In the present embodiment, when gas is ejected, the two gas ejection nozzles 13 are At the same time, it moves to the forward position.

  The nozzle body 41 is urged upward in FIG. 4 by the elastic force of the elastic spring 42. Due to the urging force (elastic force), the nozzle body 41 is positioned so that the rear end surface 412 of the nozzle body 41 abuts against the abutment surface 432 of the nozzle cap 43 (nozzle as shown in the gas ejection nozzle 13 on the right side of FIG. The main body 41 is moved backward (retracted position) and held at the retracted position.

  In a state where the nozzle main body 41 is located at the retracted position, the nozzle main body 41 is accommodated inside the nozzle housing 40, and the front end surface 411 of the nozzle main body 41 faces the front end surface 401 of the nozzle housing 40 and the inner surface 111 of the frame-shaped member 11. Become one.

  Further, the nozzle cap 43 is provided with a gas supply port 431, and compressed air as a moving force applying means is supplied from the gas supply means provided at the tip of the joint 44 through the joint 44. The compressed air is supplied to the gas supply port 431 at a pressure of 0.2 MPa, for example.

  The compressed air (gas) supplied to the gas supply port 431 flows into the gas passage 45 from the rear end face 412 side of the nozzle body 41 and presses the rear end face 412 of the nozzle body 41 at that time. Then, when the pressing force exceeds the urging force of the elastic spring 42, the nozzle body 41 resists the urging force of the elastic spring 42 as shown in the gas ejection nozzle 13 on the left side of FIG. 4. It can move forward to the inside of the reduced diameter portion 3 and move from the retracted position to the advanced position.

  When the nozzle main body 41 moves to the forward movement position, the front end surface 411 and the gas outlet 451 of the nozzle main body 41 are located inside the reduced diameter portion 3 of the processing container 2 more than the front end surface 401 of the nozzle housing 40 and the inner surface 111 of the frame-shaped member 11. Located on the side, the gas ejection port 451 opens in the direction of the light transmission window 10 (direction of the particle trapping portion C). In this state, the compressed air supplied from the gas supply port 431 to the gas passage 45 passes through the gas passage 45, and a part of the compressed air is ejected from the gas outlet 451 in the direction of the arrow D <b> 1 that is the direction of the transparent window 10. Is done. Thereby, the ejected gas can blow off the granular material particles M deposited and adhered to the particle trapping part C.

  Here, the two gas ejection nozzles 13 are arranged at positions facing each other across the light transmission window 10, and the gas ejected from each gas ejection port 451 collides at the position of the light transmission window 10. . Thereby, as shown in FIG. 5, the turbulent airflow of the direction blown up inside the reduced diameter part 3 of the processing container 2 in the position of the translucent window 10 is formed. Due to the turbulent air flow, the granular particles M captured by the particle capturing part C can be rolled up to the inside of the reduced diameter part 3 of the processing container 2 and removed from the particle capturing part C, and smoothly returned to the fluidized bed. At this time, compressed air is ejected in the direction of the arrow D1, which is the direction along the inner surface 101 of the translucent window 10 and the inner surface 111 of the frame-shaped member 11, so (Including particles adhering to the inner surface 101 of the window 10) can be efficiently wound and removed from the particle trapping portion C. Further, by rewinding the gas that has been blown up, 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.

  As shown in FIG. 4, when the gas ejection from the gas ejection nozzle 13 to the particle capturing unit C is completed, the nozzle body 41 again moves to the retracted position. Specifically, when the supply of compressed air from the gas supply port 431 is stopped or the pressure of the compressed air supplied is reduced, the nozzle body 41 is moved outside the reduced diameter portion 3 of the processing container 2 by the urging force of the elastic spring 42. It automatically moves to the side and returns to the retracted position again. In this manner, only when the gas is ejected to the particle trapping part C, the nozzle body 41 is moved forward to the inside of the reduced diameter part 3 of the processing container 2 so that the gas outlet 451 is reduced in the reduced diameter part 3 of the processing container 2. Otherwise, the nozzle main body 41 is moved to the retracted position and accommodated in the nozzle housing 40, whereby particles can be prevented from entering the gas ejection port 451. Further, since the front end surface 411 of the nozzle main body 41 is flush with the front end surface 401 of the nozzle housing 40 and the inner surface 111 of the frame-like member 11 in a state where the nozzle main body 40 is in the retracted position, Since no step is generated between the frame-like members 11, the powder particles M are not easily accumulated at the step portion between them.

  As described above, the elastic spring 42 that urges the nozzle body 41 in the backward movement direction and the compressed air that applies the pressing force in the direction in which the nozzle body 41 moves forward acts as an operating mechanism that operates the nozzle body 41. . The nozzle body 41 always receives a force in the retreating direction due to the urging force of the elastic spring 42. When the nozzle body 41 does not receive a pressing force from the compressed air, the pressing force of the compressed air acting on the nozzle body 41 is reduced. When it is smaller than the biasing force of the elastic spring 42, it automatically moves to the retracted position and can move to the advanced position by the pressing force of the compressed air. Further, the compressed air ejected from the gas ejection port 451 or the like also serves as the operation mechanism of the nozzle body 41, so that the apparatus can save energy.

  In the middle of the nozzle body 41 in the axial direction, a cutout part 413 in which a part thereof is cut out is provided. The notch 413 is provided with a regulating member 46 that is fixed to the nozzle housing 40 and protrudes from the nozzle housing 40 side to the notch 413. As shown in FIG. 6, the restricting member 46 is provided over a part of the nozzle body 41 in the radial direction through the nozzle housing 40. When the nozzle body 41 tries to rotate in the circumferential direction with respect to the nozzle housing 40, the nozzle body 41 comes into contact with the regulating member 46 and the circumferential rotation of the nozzle body 41 with respect to the nozzle housing 40 is regulated. Thus, the nozzle body 41 does not rotate in the circumferential direction even when the nozzle body 41 moves back and forth in the axial direction, and the gas ejection port 451 is always directed toward the translucent window 10. it can. Further, as shown in FIG. 4, the regulating member 46 abuts against the wall surface of the nozzle body 41 provided above and below the notch 413, thereby regulating the range of movement of the nozzle body 41 in the forward / backward direction with respect to the nozzle housing 40. You can also do it.

  As shown in FIG. 4, the branch passage 452 provided in the axial direction of the gas passage 45 is provided so as to penetrate in the radial direction of the nozzle body 41. Second gas ejection ports 453 and 454 are provided at both ends of the branch passage 452, respectively. The second gas outlet 453 on one end side is provided to open to the notch 413. Further, the second gas ejection port 454 on the other end side is provided to open in the moving gap E between the nozzle body 41 and the nozzle housing 40 (see FIG. 6). In FIG. 6, the gap between the notch 413 and the regulating member 46 and the movement gap E are exaggerated from the actual one.

  By the way, there are cases where the granular particles M flowing inside the processing container enter the moving gap E between the inner peripheral surface of the nozzle housing 40 and the outer peripheral surface of the nozzle body 41, and the moving gap is clogged with particles. Further, since the smooth movement of the nozzle body 41 with respect to the nozzle housing 40 is hindered and the operation of removing the particles that have entered the moving gap E is required, the cleaning operation inside the processing container 2 becomes complicated.

  However, in this embodiment, as shown in FIG. 4, a part of the compressed air flowing into the gas passage 45 flows into the branch passage 452, and the inner peripheral surface of the nozzle housing 40 from the second gas ejection ports 453 and 454. And a movement gap E between the nozzle body 41 and the outer peripheral surface of the nozzle body 41. The jetted compressed air can prevent the granular particles M from entering the moving gap E, and does not hinder the smooth forward and backward movement of the nozzle body 41 with respect to the nozzle housing 40, and also complicates the cleaning operation. Can be prevented.

  Even in a state where the nozzle body 41 is in the retracted position, a configuration in which compressed air is supplied to the gas supply port 431 may be adopted. The compressed air is supplied at such a pressure that the pressing force for pressing the rear end face 412 is smaller than the biasing force of the elastic spring 42 described above, and the nozzle body 41 is maintained at the retracted position. By supplying the compressed air, the compressed air is ejected from the respective gas ejection ports through the gas passage 45 and the branch passage 452, and is supplied to the moving gap E between the nozzle housing 40 and the nozzle body 41. Thereby, even when the nozzle body 41 is in the retracted position, the powder particles M inside the processing container 2 are prevented from entering the moving gap E between the nozzle housing 40 and the nozzle body 41, and the nozzles of the nozzle body 41 are prevented. The smooth advance / retreat movement of the housing 40 and the prevention of complication of the cleaning work inside the processing container 2 can be realized.

  Next, with reference to FIG. 2 and FIG. 4, the measuring method of the physical-property value of the granular material particle | grains M by the particle | grain measuring part 4 is demonstrated.

  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 gas ejection nozzle 13 and the 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 the 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 gas ejection nozzle 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. Further, in a fluidized bed apparatus having a particle measuring section (a configuration not having a concave particle capturing section) for measuring particles flowing inside the apparatus, gas is discharged from a gas ejection nozzle in order to remove particles attached to the surface of the transparent window. It can also be set as the structure which spouts.
Furthermore, 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 3 Reduced diameter part 4 Particle | grain measuring part 10 Light transmission window 11 Frame-shaped member 13 Gas ejection nozzle 20 Optical sensor 40 Nozzle housing 41 Nozzle main body 42 Elastic spring (elastic member)
45 Gas passage 451 Gas outlet 453, 454 Second gas outlet C Particle trapping part

Claims (7)

A fluidized bed apparatus for introducing at least one of granulation, coating, and drying while introducing a fluidizing gas into a processing vessel and floating and flowing the powder particles in the processing vessel to form a fluidized bed. In a fluidized bed apparatus provided with a particle measuring unit for measuring physical property values of powder particles in the processing container,
The particle measurement unit includes a light transmission window, a frame-shaped member for attaching the light transmission window to a side wall of the processing container, and physical property values of the powder particles in the processing container through the light transmission window. An optical sensor for measuring from the outer surface side of the light transmission window, and a gas ejection nozzle having a gas ejection port for ejecting gas toward the inner surface side of the light transmission window,
The gas ejection nozzle includes a cylindrical nozzle housing, a nozzle body housed in the nozzle housing and capable of moving forward and backward in the axial direction of the nozzle housing, and an operating mechanism for moving the nozzle body forward and backward.
The nozzle housing is attached to the frame-shaped member such that a front end surface thereof is flush with an inner surface of the frame-shaped member,
The nozzle body includes a gas passage, and the gas jet opening communicating with the gas passage and opening at a front end portion of the nozzle body,
The gas passage has a second gas outlet that ejects gas into a moving gap between the inner peripheral surface of the nozzle housing and the outer peripheral surface of the nozzle body,
The actuating mechanism includes an advance position in which the nozzle body moves forward to the inside of the processing container, and the gas ejection port is located on the inside of the processing container with respect to the front end surface of the nozzle housing; The gas jet port is accommodated inside the nozzle housing, and the front end surface of the nozzle body is flush with the front end surface of the nozzle housing and the inner surface of the frame-shaped member. The fluidized bed apparatus is characterized in that the nozzle main body can be moved between a retreat position and a retreat position.   The fluidized-bed apparatus of Claim 1 which has a concave particle | grain capture | acquisition part comprised by the inner surface of the said translucent window, and the internal peripheral surface of the said frame-shaped member.   The fluidized bed apparatus according to claim 1 or 2, wherein the gas ejection port of the gas ejection nozzle ejects gas in a direction along the inner surface of the light transmission window. The fluidized-bed apparatus of any one of Claim 1 to 3 with which the said gas ejection nozzle is each provided in the position which opposes on both sides of the said translucent window. The actuating mechanism includes an elastic member interposed between the nozzle housing and the nozzle body, and a moving force applying means for moving the nozzle body forward to the advance position against the elastic force of the elastic member. The fluidized-bed apparatus of any one of Claim 1 to 4 provided with these. The fluidized bed apparatus according to claim 5 , wherein the moving force applying means is compressed air supplied into the nozzle housing and flowing into a gas passage of the nozzle body. The fluidized bed apparatus according to claim 6, wherein compressed air having a pressure smaller than that of compressed air serving as the moving force applying unit is supplied to a gas passage of the nozzle body in a state where the nozzle body is located at the retracted position.

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