GB2256376A - Fluidized bed apparatus for the treatment of a particular product - Google Patents
Fluidized bed apparatus for the treatment of a particular product Download PDFInfo
- Publication number
- GB2256376A GB2256376A GB9211311A GB9211311A GB2256376A GB 2256376 A GB2256376 A GB 2256376A GB 9211311 A GB9211311 A GB 9211311A GB 9211311 A GB9211311 A GB 9211311A GB 2256376 A GB2256376 A GB 2256376A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fluidized bed
- vessel
- central tube
- space
- inlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
- F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
- F26B3/08—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed
- F26B3/092—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed agitating the fluidised bed, e.g. by vibrating or pulsating
- F26B3/0926—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed agitating the fluidised bed, e.g. by vibrating or pulsating by pneumatic means, e.g. spouted beds
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23B—PRESERVATION OF FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES; CHEMICAL RIPENING OF FRUIT OR VEGETABLES
- A23B2/00—Preservation of foods or foodstuffs, in general
- A23B2/90—Preservation of foods or foodstuffs, in general by drying or kilning; Subsequent reconstitution
- A23B2/95—Fluidised-bed drying
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23G—COCOA; COCOA PRODUCTS, e.g. CHOCOLATE; SUBSTITUTES FOR COCOA OR COCOA PRODUCTS; CONFECTIONERY; CHEWING GUM; ICE-CREAM; PREPARATION THEREOF
- A23G3/00—Sweetmeats; Confectionery; Marzipan; Coated or filled products
- A23G3/02—Apparatus specially adapted for manufacture or treatment of sweetmeats or confectionery; Accessories therefor
- A23G3/20—Apparatus for coating or filling sweetmeats or confectionery
- A23G3/2076—Apparatus for coating with powders or granules, e.g. sprinkling
- A23G3/2084—Apparatus for coating with powders or granules, e.g. sprinkling the solid particles being in a fluidised bed or whirling bed, e.g. conveyed fluidised bed
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61J—CONTAINERS SPECIALLY ADAPTED FOR MEDICAL OR PHARMACEUTICAL PURPOSES; DEVICES OR METHODS SPECIALLY ADAPTED FOR BRINGING PHARMACEUTICAL PRODUCTS INTO PARTICULAR PHYSICAL OR ADMINISTERING FORMS; DEVICES FOR ADMINISTERING FOOD OR MEDICINES ORALLY; BABY COMFORTERS; DEVICES FOR RECEIVING SPITTLE
- A61J3/00—Devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms
- A61J3/005—Coating of tablets or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
- B01J8/1872—Details of the fluidised bed reactor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
- B01J8/24—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique
- B01J8/38—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique with fluidised bed containing a rotatable device or being subject to rotation or to a circulatory movement, i.e. leaving a vessel and subsequently re-entering it
- B01J8/384—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique with fluidised bed containing a rotatable device or being subject to rotation or to a circulatory movement, i.e. leaving a vessel and subsequently re-entering it being subject to a circulatory movement only
- B01J8/386—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique with fluidised bed containing a rotatable device or being subject to rotation or to a circulatory movement, i.e. leaving a vessel and subsequently re-entering it being subject to a circulatory movement only internally, i.e. the particles rotate within the vessel
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Food Science & Technology (AREA)
- Polymers & Plastics (AREA)
- Combustion & Propulsion (AREA)
- Organic Chemistry (AREA)
- Pharmacology & Pharmacy (AREA)
- Wood Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Zoology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Microbiology (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
Description
2 z -) c) 3"?..) Fluidized Bed AoDaratus for the Treatment of A
Particulate Product The invention relates to a fluidized bed apparatus for the treatment of a particulate product having - a vessel which as reaards a perpendicular axis is essentially rotationallysymmetrical having a bottom section and a top section of internal diameter tapered upwards, - a central tube arranged equiaxially in the vessel and permitting thru-'Flow of the process gas from the top to bottom, - a fluidized bed space in the vessel located around the central tube and an annular space for introducing the upwards flow of process gas into the fluidized bed space.
From EP 0212397 Sheet 1 an apparatus in the field of the invention is known in which a central tube is provided for introducing the process gas into the vessel which is inserted into the vessel from the top and merges at the bottom in a pan which deflects the process gas and allows it to flow through an annular space located around the central tube up into the interior space of the vessel. To the vessel top section a top mounted fixture is secured through which used process gas flows upwards. To prevent particles of 'the treated product from coming.1ogether with the process gas in the top mounted fixture of the vessel an annular baffle is provided in the vessel underneath the top mounted fixture. Between the baffle and the central tube on the one hand and the internal wall of the vessel on the other an annular passageway is left free for passage of the used process cias. The vessel top section forms together with the top mounted fixture, the central tube and 'the baffle an assembly which can be separated as a whole from the vessel bottom section so that the apparatus can be cleaned.
The invention is based on the object of creating a fluidized bed apparatus which is especially suitable for the treatment of relatively large particles and which requires exceptionally little space in relation tO its holding capacity. Large particles are understood to mean in particular round or elongated tablets, pellets and the like, i.e. particles having free interspaces in bulk. Treatment involves for instance applying a coating of an acqueous or oraanic solution, dispersion or suspension which is resistent to stomach juices.
The object is achieved according to the invention on the basis of a fluidized bed apparatus of the kind as described aforementioned in that said central tube for discharging the used process gas is provided to commence within the vessel top section with an inlet, extending downwards to protrude from the bottom of the vessel and in that the vessel above said inlet forms a shallow dome.
By this arrangement there is no need for a top mounted fixture on the vessel for discharging the used process gas; the process gas being introduced at the bottom from where it is also discharged.
01 The inlet of the central tube is preferably flared downwards.
It is particularly beneficial when the inlet Of.the central tube and the vessel top section feature curved contours symmetrically opposed to each other in the axial section so that they face each other by their concave sides. In this way the vessel top section with its inner wall and the inlet of the central tube with its outer wall delineate the fluidized bed space so that the fluidized product therein is circulated evenly.
The last-mentioned feature is preferably embodied by the vessel bottom section beina spnerically domed, at least in its upper area, and the vessel L top sect-lon as a whole, and by providing the central Lube with a claddina interfacina its inlet at the bottom with which it is concoured as the arc of a circle.
The annular space for introducing the process gas into the vessel Preferably contains a grating delineating the fluidized bed space downwards so that 1-1culate produC the latter can be charged from the to p with the parL -t, the individual particles of which, such as tablets, are large enough to not drop through the grating.
1 f the product 1 s to be sprayed by a known method ( EP 02 12397 B 1) 1 t is good practice to provide several nozzles extending through the grating for spraying a flowable substance into the fluidized bed space.
It has also proved to be good practice to arrange for the annular space for introducing the process gas into the fluidized bed space to be narrow with respect to the largest width of the fluidized bed space and for the latter to be open only in a region vertically above 'the annular space upwards towards the inlet of the central tube. This arrangement enhances a symmetrical flow in which the product flows upwards in a centr al region of the, luldized bed space before being returned downwards in a radial inner flow and radial outer flow.
These desired flows are further enhanced by the inlet of the central tube having a maximum outer diameter roughly as large as the average diameter of 'the annular space for introducina the process gas into 'the fluidized bed space.
An example embodiment of the invention will now be explained on the basis ther details, in which:
of the schematic drawings showing jurL Fig. 1 is a vertical axial section 'Lhrouah a fluidized bed apparatus according to the invention; and Fig. 2 is a corresponding plan view with the vessel 'LOP section partly cut away.
The fluidized bed apparatus as shown is substantially rotatlonally symmetrical with reference to a vertical axis A and features a substantially spherically shaped vessel 10 supported by a base 12 via an intermediate piece 14 and comprising a vessel bottom section 16 together with a vessel top section 18. In the example shown, the vessel bottom section 16 extends slightly above the equatorial plane E of the vessel 10 upwards, the vessel top section 18 is accordingly a spherical segment somewhat smaller than a semi-sphere. As indicated by the dashed lines in Fig. 1,the vessel top section 18 can be swivelled upwards away from the vessel bottom section 16.
- 1 In the vessel 10 a vertical central tube 20 is provided, having a flared inlet 22 at the top, extending from the vessel at the bottom and connected to a pipe bend 24 incorporated in the base 12. The base 12 has an inlet port 26 for fresh process gas which may be heated dry air, for instance, and an outlet port 28 at the end of the pipe bend 24 for used process gas. The outlet port 28 is connected in the usual way (and therefore,not shown) via one or more dust separators to the suction end of a blower, the pressure end of which is connected via a heater and, where necessary, via further conditioning apparatuses to the inlet port 26.
From the inlet port 26 the fresh process gas flows concentrically to the central tube 20, around this upwards into an annular space 30, formed in the intermediate piece 14 and forming a tapered opening at the top, and from here into a narrow cylindrical annular space 132 formed in the lower region ol- the bottom section 16 of the vessel and containing nozzles 34. These nozzles 34 are dual-material nozzles arranged equispaced at an angle around the axis A and receiving a flow of fluid and a gas at high pressure for spaying the fluid by two annular channels 36 and 38 fitted to the intermediate piece 14. The axes of all nozzles 34 are located on a circle, the diameter D32 of which is the mean diameter of the annular space 32.
Above the annular space 32 a fluidized bed space 40 is delineated outwardly by the spherical wall areas of the vessel bottom section 16 and of the vessel top section 18, and radially inwards by the outer wall of the inlet 22 of the central tube 20 and a cladding 42 extending inwards within the vessel bottom section 16 around the central tube 20.
In the axial section as shown in Fig. 1 the outer wall of the inlet 22 and the cladding 42 form a spherical arc having a radiOs R, the center- point of which lies on the equatorial plane E of the vessel 10 and agrees at least approximately with the radius of the inner wall of the vessel. The 'I luldizea he annular space 32 upwards tO bed space 40 is extended continuously from t Lhe equatorial plane E above which it is tapered.
i 1 Ca 1 the fluidized bed space 40 Is From the cylind annular space 32 separated by a grating 44 through which the nozzles 34 protrude upwards.
The inlet 22 has a maximum outer diameter D22 which is approximately as large as the diameter D 32. Between the inle 22 and the inner wall of the "Ion 18 an annular area 46 remains free which is locate vessel 'LOP sect ---i perpendicular above the annular space 32 and is approximately as large as the useful area of the annular space 32 left free by the grating 44.
The process gas I'1owing throuah the grating 44 into the fluidizea bed space AO fluidizes the product being treated there so 'that it forms a dual vortex as is indicated by 'the arrows in Fig. 1. The used process ClaS flOWS through t e -he shallow domed area Of the Lhe annular space 46 uDwards, is deflected by 'L vessel top section 18 above the inlet 22 downwards into this inlerl and is SUCtioned off through the central tube 20 and through the pipe bend 24.
Claims (9)
- I A filuldized-bed apparatus for the treatment of a particulate product comprising - a vessel (10) which as regards a perpendicular axis (A) is essentially rotational ly-symmetrical having a bottom section (16) and a top section (18) of internal diameter tapered upwards, - a central tube (20) arranged equiaxially in the vessel 0 0) and permitting ti-,ru-flow of 'the process gas from the top to bottom, - a f luldi zed bed space (40) in said vessel ( 10) located around said central tube (20) and - an annular space (32) for introducing the upwards flow of process gas into said fluidized bed space.(40) c h a r a c t e r i z e d in that - said central tube (20) for discharging the used process gas is provided to commence within said vessel top section ( 18) with an inlet (22), extending downwards to protrude from the bottom of said vessel ( 10) and in that said vessel 0 0) above said inlet (22) forms-a shallow dome.
- 2. A fluidized bed apparatus according to claim 1, wherein said inlet (22) of said central tube (20) is flared downwards.
- 3. A fluidized bed apparatus accordina to claim 2, wherein 1 said inlet (22) of said central tube (20) and said vessel top section ( 18) in axial section feature curved contours symmetrically opposed to each other so that they face each other by their concave sides.
- 4. A fluidized bed apparatus according to claim 3, wherein said vessel bottom section ( 16) is spherically domed at least in its upper area, tooether with said vessel top section (118) as a whole, and wherein said central tube (20) features a cladding (42) interfacing its inlet (22) at the bottom with which it is contoured as the arc of a circle.
- 5. A fluidized bed apparatus according to any of the claims 1 thru 4, wherein said annular space (32) for introducing the process gas contains a grating (44) extendine downwards to delineate said fluidized bed space (40)
- 6. A fluidized bed apparatus according to claim 5, wherein several nozzles (34) are provided extending through said grating (44) for spraying a flowable substance into said fluidized bed space (40)
- 7. A fluidized bed apparatus according to any of the claims 1 thru 6, wherein - said annular space (32) for introducing the process gas into said fluidized bed space (40) is narrow with respect to the largest width of said fluidized bed space (40) and - said fluidized bed space (40) is open only in a region vertically above said annular space (32) upwards towards said inlet (22) of said central tube (20) Or 9
- 8. A fluidized bed apparatus according to claim 7, wherein said inlet (22) of said central tube (20) has a maximum outer diameter (D22) roughly as large as the average diameter (D32) of said annular space (32) for introducing the gas into said fluidized bed space (40).A fluidized bed apparatus substantially as described with reference to or as illustrated in the process
- 9. herein accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4118439A DE4118439A1 (en) | 1991-06-05 | 1991-06-05 | FLUID BED APPARATUS FOR TREATING PARTICLE-SHAPED GOODS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9211311D0 GB9211311D0 (en) | 1992-07-15 |
| GB2256376A true GB2256376A (en) | 1992-12-09 |
Family
ID=6433229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9211311A Withdrawn GB2256376A (en) | 1991-06-05 | 1992-05-28 | Fluidized bed apparatus for the treatment of a particular product |
Country Status (3)
| Country | Link |
|---|---|
| CH (1) | CH686408A5 (en) |
| DE (1) | DE4118439A1 (en) |
| GB (1) | GB2256376A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0212397A2 (en) * | 1985-08-28 | 1987-03-04 | Herbert Hüttlin | Fluidized-bed apparatus |
| US4685909A (en) * | 1985-05-15 | 1987-08-11 | The Procter & Gamble Company | Disposable absorbent articles |
-
1991
- 1991-06-05 DE DE4118439A patent/DE4118439A1/en not_active Withdrawn
-
1992
- 1992-05-28 GB GB9211311A patent/GB2256376A/en not_active Withdrawn
- 1992-06-02 CH CH176992A patent/CH686408A5/en not_active IP Right Cessation
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4685909A (en) * | 1985-05-15 | 1987-08-11 | The Procter & Gamble Company | Disposable absorbent articles |
| EP0212397A2 (en) * | 1985-08-28 | 1987-03-04 | Herbert Hüttlin | Fluidized-bed apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9211311D0 (en) | 1992-07-15 |
| CH686408A5 (en) | 1996-03-29 |
| DE4118439A1 (en) | 1992-12-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |