EP3303957B1 - Spray dryer with improved sealing - Google Patents
Spray dryer with improved sealing Download PDFInfo
- Publication number
- EP3303957B1 EP3303957B1 EP16729186.3A EP16729186A EP3303957B1 EP 3303957 B1 EP3303957 B1 EP 3303957B1 EP 16729186 A EP16729186 A EP 16729186A EP 3303957 B1 EP3303957 B1 EP 3303957B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- spray dryer
- drying chamber
- rim
- chamber
- seal
- 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.)
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Links
- 239000007921 spray Substances 0.000 title claims description 34
- 238000007789 sealing Methods 0.000 title claims description 28
- 238000001035 drying Methods 0.000 claims description 47
- 229920001296 polysiloxane Polymers 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 230000000717 retained effect Effects 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 2
- VJYFKVYYMZPMAB-UHFFFAOYSA-N ethoprophos Chemical compound CCCSP(=O)(OCC)SCCC VJYFKVYYMZPMAB-UHFFFAOYSA-N 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000001694 spray drying Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229920006169 Perfluoroelastomer Polymers 0.000 description 1
- 229920006362 TeflonĀ® Polymers 0.000 description 1
- YACLQRRMGMJLJV-UHFFFAOYSA-N chloroprene Chemical compound ClC(=C)C=C YACLQRRMGMJLJV-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- -1 fluorosilicone Polymers 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002572 peristaltic effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
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- 238000011179 visual inspection Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/008—Seals, locks, e.g. gas barriers or air curtains, for drying enclosures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/06—Chambers, containers, or receptacles
- F26B25/08—Parts thereof
- F26B25/12—Walls or sides; Doors
-
- 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
- F26B3/10—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 carrying the materials or objects to be dried with it
- F26B3/12—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 carrying the materials or objects to be dried with it in the form of a spray, i.e. sprayed or dispersed emulsions or suspensions
Definitions
- the present invention relates to a spray dryer comprising a drying chamber defining at least a radial direction and an axial direction, with an opening bordered by a rim, a chamber roof having a closing surface facing the rim, the chamber roof being movable between an open position and a closed position, and a seal provided at the interface between the rim of the drying chamber and the closing surface of the chamber roof to seal said interface in said closed position.
- a spray dryer is known from CN104457200A .
- MOBILE MINORTM which is a spray dryer primarily for R&D purposes, is also such a spray dryer. It is thus a relatively small unit for exploring the possibilities of spray drying, for making test work and powder samples and for establishing the process data required for scale-up. Thus, small quantities of solutions, suspensions and emulsions can be dried into powder samples for further evaluation. Feed is supplied by a peristaltic or a mono pump and can be atomized by a rotary atomizer or by a nozzle (e.g. two-fluid or pressure) cocurrent or counter-current to the air flow. The chamber conditions can either be in under or over pressure. Product can be recovered either directly from the drying chamber, or from accessory units such as a cyclone and/or bag filter.
- the rim of the drying chamber is formed as a plane surface substantially perpendicular to the axial direction, and the closing surface of the chamber roof is also designed as a plane surface.
- the seal ensures the required tightness at the interface between the chamber roof closing surface and the drying chamber rim during operation.
- the seal of the above-identified spray dryer is provided as a specially configured sealing lip of silicone positioned in a track of the rim. The sealing lip is exposed to the product processed in the spray dryer and to relatively high temperatures during operation.
- the silicone sealing lip provides for excellent tightness under normal circumstances, it must be ensured that it is safely retained in the track when opening the chamber roof. In those cases, there is a risk of partial or full extraction of the sealing lip from the track, if the sealing lip for instance sticks to the closing surface of the chamber roof. Reinsertion of the sealing lip into the track is cumbersome, with a risk of incorrect positioning of the sealing lip in the track or of damaging the sealing lip thus possibly resulting in that the seal needs to be replaced. As the choice of material of the sealing lip is limited due to the special configuration, the required properties as regards chemical and temperature resistance are not always optimal which in turn reduces the lifetime of the sealing lip, thus rendering the use of a silicone sealing lip a relatively expensive solution.
- a spray dryer of the kind mentioned in the introduction which is furthermore characterized in that a neck section including a circumferential groove facing the outwards radial direction, away from the opening of the drying chamber, is provided on either the rim of the drying chamber or the closing surface of the chamber roof, and that the seal is accommodated in said circumferential groove to seal against the other of the closing surface of the chamber roof or the rim of the drying chamber in said closed position.
- the neck section may be provided on either one of the drying chamber or the chamber roof.
- the neck section including the circumferential groove facing the outwards radial direction, away from the opening of the drying chamber is provided on the rim of the drying chamber, and the seal is accommodated in said circumferential groove.
- the rim of the drying chamber includes the seat of the seal, which in turn allows the chamber roof to be formed in a more simple, lightweight and inexpensive manner.
- the seal is an O-ring seal.
- the O-ring is a well-proven mechanical gasket or packing in the form of a toric joint, i.e. a circular loop with a circular cross-section.
- a toric joint i.e. a circular loop with a circular cross-section.
- the spray dryer 1 comprises a drying chamber 2 and a chamber roof 3.
- the chamber roof 3 is movable between an open position and a closed position.
- an opening device 4 is provided and includes a number of lifting cylinders 41 mounted on the drying chamber 2 and cooperating with fittings 42 positioned on the chamber roof 3.
- Locking means 5 are also provided in the form of clamps 51 on the drying chamber 2 cooperating with hooks 52 of the chamber roof 3.
- the chamber roof 3 is furthermore provided with handles 6 and a supply pipe 8 for drying gas. Feed is supplied directly to the atomizing means (not shown) for which a port 9 is provided.
- the drying chamber 2 has an opening 23 to a substantially cylindrical interior upper part of the drying chamber and has a conical lower part 24.
- Two sight-glasses 7 are provided for visual inspection of the interior of the drying chamber 2 during operation.
- the above-mentioned elements are as such well-known from the commercially available spray dryer MOBILE MINORTM (GEA Niro).
- the spray dryer is typically applied for small-scale evaluation of spray drying feasibility and testing of the unit in R&D applications.
- Typical examples of the dimensions of the elements are the following:
- the drying chamber has a 0.8 m diameter, a 0.6 m cylindrical height and a 60 degree conical bottom.
- the 100 kg/h of drying air is heated electrically and has a maximum inlet temperature of 350Ā°C.
- a chamber height extension piece (not shown) is available to increase the height of the drying chamber. Details of the above-mentioned elements will not be elaborated upon. Neither will additional elements including for instance discharge ports for finalized product and other accessory equipment be described in detail.
- the drying chamber 2 defines a radial direction and an axial direction.
- the opening 23 is bordered by a rim 20, and the chamber roof 3 has a closing surface 30 facing the rim 20 in the closed position.
- a seal 10 is provided at the interface between the rim 20 of the drying chamber 2 and the closing surface 30 of the chamber roof 3 to seal the interface in said closed position.
- the rim 20 of the drying chamber 2 comprises a neck section 200 including a circumferential groove 25 facing the outwards radial direction, away from the opening 23 of the drying chamber 2.
- the seal 10 is accommodated in the circumferential groove 25.
- the seal is an O-ring seal 10.
- O-ring seals are well-known in the art as toric joints, i.e. a circular loop of with a circular cross-section. Other seals are conceivable as well, including circular seals or joints having a non-circular cross-section such as an x-shaped profile or rectangular cross-section.
- the O-ring seal 10 is easily mounted and safely retained on the neck section 200.
- the material of the O-ring may be chosen from a wide variety, including for instance polymer, rubber, elastomer, compound, nitrile, fluorocarbon, ethylene propylene, perfluoroelastomer, chloroprene, fluorosilicone, TeflonĀ®, and polyurethane.
- the O-ring seal 10 is furthermore positioned in such a way on the neck section 200 that it provides points of contact with the closing surface 30 of the chamber roof 3 in both the radial and the axial directions.
- the drying chamber 2 comprises an outer wall 21 and an inner wall 22, and the neck section 200 comprises an integral edge part of the outer wall 21.
- the neck section 200 comprises a seat portion 214 of the groove 25 formed in the integral edge part of the outer wall 21 and facing the outwards radial direction and the upwards axial direction.
- the neck section 200 comprises a splayed edge portion 221 of the inner wall 22 located adjacent to the seat portion 214 of the groove 25 formed in the integral edge part of the outer wall 21.
- the splayed edge portion 221 faces the outwards radial direction and the downwards axial direction.
- the seat portion 214 of the groove 25 is adjoined by, starting from the outer wall 21, a first flat portion 211, an inclined portion 212 and a raised second flat portion 213.
- the profile of the groove 25 is shown as substantially part-circular, other shapes are conceivable, including oval, elliptic, rectangular, triangular or trapezoidal.
- the closing surface 30 of the chamber roof 3 comprises a profiled border section 300 facing the neck section 200 of the rim 20 of the drying chamber 2.
- the profiled border section 300 is formed as an integral edge part of the bottom wall 33 adjoining the side wall 31.
- the profiled border section 300 of the closing surface 30 of the chamber roof 3 comprises a first sealing portion 313 in the inwards radial direction and a second sealing portion 314 in the downwards axial direction.
- the profiled border section 300 has a configuration, in which, starting from the side wall 31, an edge portion 311 and a raised flat portion 312 adjoin the first sealing portion 313, and the second sealing portion 314 adjoins the first sealing portion 313 on the outwards radial side and the remaining part of the bottom wall 33 of the chamber roof 3 on the inwards radial side.
- the manufacture of the neck section of the drying chamber rim and the profiled border section of the chamber roof closing surface may in principle be carried out in any suitable manner. Suitable techniques include sheet metal forming such as drawing, pressing, pulling, rolling and/or punching.
- a filter e.g. SANICIPTM bag filter delivered by GEA. It consists of a cylindrical bag housing with a tangential or direct air inlet, clean air plenum on top, and a conical bottom with fluidized powder discharge.
- SANICIPTM bag filter delivered by GEA. It consists of a cylindrical bag housing with a tangential or direct air inlet, clean air plenum on top, and a conical bottom with fluidized powder discharge.
- the product collected on the outside of the filter bags is blown off by a compressed air jet stream from the inside of each bag by means of a specially designed reverse jet air nozzle positioned above the bag.
- the bag filter housing may have a removable top cover, which gives easy access to the bags and support-cages.
- Such top covers can be of the type described in this invention using the same or equal sealing design and means.
- the neck section with the groove accommodating the seal may alternatively be placed on the chamber roof to interact with the rim of the drying chamber which has been modified accordingly.
- drying chamber and the chamber roof have been described as substantially cylindrical, other shapes might be contemplated. In such cases, the term āradialā should be conceived as a transverse direction.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Drying Of Solid Materials (AREA)
Description
- The present invention relates to a spray dryer comprising a drying chamber defining at least a radial direction and an axial direction, with an opening bordered by a rim, a chamber roof having a closing surface facing the rim, the chamber roof being movable between an open position and a closed position, and a seal provided at the interface between the rim of the drying chamber and the closing surface of the chamber roof to seal said interface in said closed position. Such a spray dryer is known from
CN104457200A . - The well-known and commercially available MOBILE MINORā¢ (GEA Niro), which is a spray dryer primarily for R&D purposes, is also such a spray dryer. It is thus a relatively small unit for exploring the possibilities of spray drying, for making test work and powder samples and for establishing the process data required for scale-up. Thus, small quantities of solutions, suspensions and emulsions can be dried into powder samples for further evaluation. Feed is supplied by a peristaltic or a mono pump and can be atomized by a rotary atomizer or by a nozzle (e.g. two-fluid or pressure) cocurrent or counter-current to the air flow. The chamber conditions can either be in under or over pressure. Product can be recovered either directly from the drying chamber, or from accessory units such as a cyclone and/or bag filter.
- In the above-identified spray dryer, the rim of the drying chamber is formed as a plane surface substantially perpendicular to the axial direction, and the closing surface of the chamber roof is also designed as a plane surface. The seal ensures the required tightness at the interface between the chamber roof closing surface and the drying chamber rim during operation. To that end, the seal of the above-identified spray dryer is provided as a specially configured sealing lip of silicone positioned in a track of the rim. The sealing lip is exposed to the product processed in the spray dryer and to relatively high temperatures during operation.
- Although the silicone sealing lip provides for excellent tightness under normal circumstances, it must be ensured that it is safely retained in the track when opening the chamber roof. In those cases, there is a risk of partial or full extraction of the sealing lip from the track, if the sealing lip for instance sticks to the closing surface of the chamber roof. Reinsertion of the sealing lip into the track is cumbersome, with a risk of incorrect positioning of the sealing lip in the track or of damaging the sealing lip thus possibly resulting in that the seal needs to be replaced. As the choice of material of the sealing lip is limited due to the special configuration, the required properties as regards chemical and temperature resistance are not always optimal which in turn reduces the lifetime of the sealing lip, thus rendering the use of a silicone sealing lip a relatively expensive solution.
- On this background, it is an object of the present invention to provide a spray dryer in which a reliable sealing is achieved in a cost-effective manner.
- This and further objects are achieved by a spray dryer of the kind mentioned in the introduction, which is furthermore characterized in that a neck section including a circumferential groove facing the outwards radial direction, away from the opening of the drying chamber, is provided on either the rim of the drying chamber or the closing surface of the chamber roof, and that the seal is accommodated in said circumferential groove to seal against the other of the closing surface of the chamber roof or the rim of the drying chamber in said closed position.
- In this manner, a more cost-effective solution has been found, as the provision of a groove in a neck section on either the drying chamber rim or the chamber roof closing surface renders the choice of seal more flexible. As the seal is safely retained in the groove of the neck section by positive engagement, i.e. by the shape of the components involved, the risk that the seal is unintentionally moved out of its correct position is limited or even eliminated. This reduces the costs involved in incorrect sealing and replacement of the seal.
- In principle, the neck section may be provided on either one of the drying chamber or the chamber roof. In a presently preferred embodiment, however, the neck section including the circumferential groove facing the outwards radial direction, away from the opening of the drying chamber, is provided on the rim of the drying chamber, and the seal is accommodated in said circumferential groove. In this manner, the rim of the drying chamber includes the seat of the seal, which in turn allows the chamber roof to be formed in a more simple, lightweight and inexpensive manner.
- In a further preferred embodiment, the seal is an O-ring seal. The O-ring is a well-proven mechanical gasket or packing in the form of a toric joint, i.e. a circular loop with a circular cross-section. When the O-ring is accommodated in the groove, its compression characteristics between the drying chamber and the chamber roof create a reliable seal at the interface. O-rings are known as inexpensive, easy to make, reliable, and have simple mounting requirements. At the same time the sealing properties relative to the silicone sealing lip of the known spray dryer are maintained or even improved.
- Further details are described, and further advantages stated, in the description of particular embodiments of the invention.
- In the following the invention will be described in further detail by means of examples of embodiments with reference to the schematic drawings, in which
-
Fig. 1 is a front perspective view of a spray dryer in an embodiment of the invention; -
Figs 2 and 3 are perspective views of the drying chamber and the chamber roof, respectively, of the spray dryer ofFig. 1 ; -
Fig. 4 is a top view of the spray dryer ofFig. 1 ; -
Fig. 5 is a perspective view of the chamber roof ofFig. 3 , from another angle; -
Figs 6 and 7 are plan views of the spray dryer ofFig. 1 , seen from the side and the back, respectively; -
Fig. 8 is a partial front view of the spray dryer ofFig. 1 , on a slightly larger scale; -
Fig. 9 is a sectional view corresponding toFig. 8 ; -
Fig. 10 is a partial sectional view of the detail marked X inFig. 9 , on a still larger scale; -
Fig. 11 is a view corresponding toFig. 10 ; however with the seal of the spray dryer removed; -
Fig. 12 is a view corresponding toFig. 5 , on a larger scale; and -
Fig. 13 is a partial view corresponding toFig. 3 , on a larger scale. - Referring initially to
Figs 1 to 7 of the drawings, an embodiment of a spray dryer generally designated 1 is shown. Thespray dryer 1 comprises adrying chamber 2 and achamber roof 3. - The
chamber roof 3 is movable between an open position and a closed position. To that end, anopening device 4 is provided and includes a number oflifting cylinders 41 mounted on thedrying chamber 2 and cooperating withfittings 42 positioned on thechamber roof 3. Locking means 5 are also provided in the form ofclamps 51 on thedrying chamber 2 cooperating withhooks 52 of thechamber roof 3. - The
chamber roof 3 is furthermore provided withhandles 6 and asupply pipe 8 for drying gas. Feed is supplied directly to the atomizing means (not shown) for which aport 9 is provided. - The
drying chamber 2 has an opening 23 to a substantially cylindrical interior upper part of the drying chamber and has a conicallower part 24. Two sight-glasses 7 are provided for visual inspection of the interior of thedrying chamber 2 during operation. - The above-mentioned elements are as such well-known from the commercially available spray dryer MOBILE MINORā¢ (GEA Niro). The spray dryer is typically applied for small-scale evaluation of spray drying feasibility and testing of the unit in R&D applications. Typical examples of the dimensions of the elements are the following: The drying chamber has a 0.8 m diameter, a 0.6 m cylindrical height and a 60 degree conical bottom. The 100 kg/h of drying air is heated electrically and has a maximum inlet temperature of 350Ā°C. A chamber height extension piece (not shown) is available to increase the height of the drying chamber. Details of the above-mentioned elements will not be elaborated upon. Neither will additional elements including for instance discharge ports for finalized product and other accessory equipment be described in detail.
- The configuration of the elements relevant to the sealing between the
drying chamber 2 and thechamber roof 3 will now be described in some detail. - The
drying chamber 2 defines a radial direction and an axial direction. Theopening 23 is bordered by arim 20, and thechamber roof 3 has aclosing surface 30 facing therim 20 in the closed position. To that end, aseal 10 is provided at the interface between therim 20 of thedrying chamber 2 and theclosing surface 30 of thechamber roof 3 to seal the interface in said closed position. - Referring now to the more detailed
Figs 8 to 13 of the shown and described embodiment, therim 20 of thedrying chamber 2 comprises aneck section 200 including acircumferential groove 25 facing the outwards radial direction, away from the opening 23 of thedrying chamber 2. - The
seal 10 is accommodated in thecircumferential groove 25. In the embodiment shown, the seal is an O-ring seal 10. O-ring seals are well-known in the art as toric joints, i.e. a circular loop of with a circular cross-section. Other seals are conceivable as well, including circular seals or joints having a non-circular cross-section such as an x-shaped profile or rectangular cross-section. - As will be described in the following, the O-
ring seal 10 is easily mounted and safely retained on theneck section 200. The material of the O-ring may be chosen from a wide variety, including for instance polymer, rubber, elastomer, compound, nitrile, fluorocarbon, ethylene propylene, perfluoroelastomer, chloroprene, fluorosilicone, TeflonĀ®, and polyurethane. - In the embodiment shown, the O-
ring seal 10 is furthermore positioned in such a way on theneck section 200 that it provides points of contact with the closingsurface 30 of thechamber roof 3 in both the radial and the axial directions. - To that end, the drying
chamber 2 comprises anouter wall 21 and aninner wall 22, and theneck section 200 comprises an integral edge part of theouter wall 21. Theneck section 200 comprises aseat portion 214 of thegroove 25 formed in the integral edge part of theouter wall 21 and facing the outwards radial direction and the upwards axial direction. - Particular safe retention of the O-
ring seal 10 in thegroove 25 is obtained in that theneck section 200 comprises a splayededge portion 221 of theinner wall 22 located adjacent to theseat portion 214 of thegroove 25 formed in the integral edge part of theouter wall 21. The splayededge portion 221 faces the outwards radial direction and the downwards axial direction. - In the specific embodiment shown in the drawings, the
seat portion 214 of thegroove 25 is adjoined by, starting from theouter wall 21, a firstflat portion 211, aninclined portion 212 and a raised secondflat portion 213. - Although the profile of the
groove 25 is shown as substantially part-circular, other shapes are conceivable, including oval, elliptic, rectangular, triangular or trapezoidal. - In the embodiment shown, the closing
surface 30 of thechamber roof 3 comprises a profiledborder section 300 facing theneck section 200 of therim 20 of the dryingchamber 2. For ease of manufacture in those cases in which thechamber roof 3 comprises aside wall 31 and abottom wall 33, the profiledborder section 300 is formed as an integral edge part of thebottom wall 33 adjoining theside wall 31. - To match the
neck section 200 of therim 20 of the dryingchamber 2, the profiledborder section 300 of the closingsurface 30 of thechamber roof 3 comprises afirst sealing portion 313 in the inwards radial direction and asecond sealing portion 314 in the downwards axial direction. - In the specific embodiment, the profiled
border section 300 has a configuration, in which, starting from theside wall 31, anedge portion 311 and a raisedflat portion 312 adjoin thefirst sealing portion 313, and thesecond sealing portion 314 adjoins thefirst sealing portion 313 on the outwards radial side and the remaining part of thebottom wall 33 of thechamber roof 3 on the inwards radial side. - The manufacture of the neck section of the drying chamber rim and the profiled border section of the chamber roof closing surface may in principle be carried out in any suitable manner. Suitable techniques include sheet metal forming such as drawing, pressing, pulling, rolling and/or punching.
- When operating a spray dryer the exhaust air containing powder particles is passed through a filter, e.g. SANICIPā¢ bag filter delivered by GEA. It consists of a cylindrical bag housing with a tangential or direct air inlet, clean air plenum on top, and a conical bottom with fluidized powder discharge. During operation, the product collected on the outside of the filter bags is blown off by a compressed air jet stream from the inside of each bag by means of a specially designed reverse jet air nozzle positioned above the bag. When bags are worn down, they need to be changed. Therefore the bag filter housing may have a removable top cover, which gives easy access to the bags and support-cages. Such top covers can be of the type described in this invention using the same or equal sealing design and means.
- Although the invention has been described with reference to a specific embodiment in the above, modifications are conceivable. For instance, with appropriate modification of the configuration, the neck section with the groove accommodating the seal may alternatively be placed on the chamber roof to interact with the rim of the drying chamber which has been modified accordingly.
- Furthermore, while the drying chamber and the chamber roof have been described as substantially cylindrical, other shapes might be contemplated. In such cases, the term "radial" should be conceived as a transverse direction.
Claims (12)
- A spray dryer (1) comprising:a drying chamber (2) defining at least a radial direction and an axial direction, with an opening (23) bordered by a rim (20),a chamber roof (3) having a closing surface (30) facing the rim (20), the chamber roof (3) being movable between an open position and a closed position, anda seal (10) provided at the interface between the rim (20) of the drying chamber (2) and the closing surface (30) of the chamber roof (3) to seal said interface in said closed position,characterised in thata neck section (200) including a circumferential groove (25) facing the outwards radial direction, away from the opening (23) of the drying chamber (2), is provided on either the rim (20) of the drying chamber (2) or the closing surface (30) of the chamber roof (3), and thatthe seal (10) is accommodated in said circumferential groove (25) to seal against the other of the closing surface (30) of the chamber roof (3) or the rim (20) of the drying chamber (2) in said closed position.
- A spray dryer according to claim 1, wherein the neck section (200) including the circumferential groove (25) facing the outwards radial direction, away from the opening (23) of the drying chamber (2), is provided on the rim (20) of the drying chamber (2), and wherein the seal (10) is accommodated in said circumferential groove (25).
- A spray dryer according to claim 2, wherein the drying chamber (2) comprises an outer wall (21) and an inner wall (22), and the neck section (200) comprises an integral edge part of the outer wall (21).
- A spray dryer according to claim 3, wherein the neck section (200) comprises a seat portion (214) of the groove (25) formed in the integral edge part of the outer wall (21) and facing the outwards radial direction and the upwards axial direction.
- A spray dryer according to claim 4, wherein the neck section (200) comprises a splayed edge portion (221) of the inner wall (22) located adjacent to the seat portion (214) of the groove (25) formed in the integral edge part of the outer wall (21), said splayed edge portion (221) facing the outwards radial direction and the downwards axial direction.
- A spray dryer according to claims 4 or 5, wherein, starting from the outer wall (21), a first flat portion (211), an inclined portion (212) and a raised second flat portion (213) adjoin the seat portion (214) of the groove (25).
- A spray dryer according to any one of the preceding claims, wherein the profile of the groove (25) is substantially part-circular, oval, elliptic, rectangular, triangular or trapezoidal.
- A spray dryer according to any one of the preceding claims, wherein the neck section (200) including the circumferential groove (25) facing the outwards radial direction, away from the opening (23) of the drying chamber (2), is provided on the rim (20) of the drying chamber (2), and wherein the closing surface (30) of the chamber roof (3) comprises a profiled border section (300) facing the neck section (200) of the rim (20) of the drying chamber (2).
- A spray dryer according to claim 8, wherein the chamber roof (3) comprises a side wall (31) and a bottom wall (33), and wherein the profiled border section (300) is formed as an integral edge part of the bottom wall (33) adjoining the side wall (31).
- A spray dryer according to claim 9, wherein the profiled border section (300) of the closing surface (30) of the chamber roof (3) comprises a first sealing portion (313) in the inwards radial direction and a second sealing portion (314) in the downwards axial direction.
- A spray dryer according to claim 10, wherein, starting from the side wall (31), an edge portion (311) and a raised flat portion (312) adjoin the first sealing portion (313), and the second sealing portion (314) adjoins the first sealing portion (313) on the outwards radial side and the remaining part of the bottom wall (33) of the chamber roof (3) on the inwards radial side.
- A spray dryer according to any one of the preceding claims, wherein the seal is an O-ring seal (10).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DKBA201500077U DK201500077U4 (en) | 2015-06-04 | 2015-06-04 | SpraytĆørrer med forbedret pakning |
PCT/DK2016/050162 WO2016192737A1 (en) | 2015-06-04 | 2016-06-03 | Spray dryer with improved sealing |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3303957A1 EP3303957A1 (en) | 2018-04-11 |
EP3303957B1 true EP3303957B1 (en) | 2019-04-03 |
Family
ID=56103142
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16729186.3A Active EP3303957B1 (en) | 2015-06-04 | 2016-06-03 | Spray dryer with improved sealing |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3303957B1 (en) |
DK (2) | DK201500077U4 (en) |
WO (1) | WO2016192737A1 (en) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH681564A5 (en) * | 1990-08-14 | 1993-04-15 | Glatt Maschinen & Apparatebau | Installation for drying particle form material - comprises container with vertical axis and fixed, gastight walling, container having material chamber and filter retainer |
US5653813A (en) * | 1995-04-03 | 1997-08-05 | Novellus Systems, Inc. | Cyclone evaporator |
US6659375B1 (en) * | 2002-02-26 | 2003-12-09 | Rpm Solutions, Inc. | Atomizer lid assembly for an atomizer head |
EP2125154A2 (en) * | 2007-03-15 | 2009-12-02 | Janssen Pharmaceutica, N.V. | Filter assembly containing metal fiber filter elements |
CN104457200A (en) * | 2014-12-11 | 2015-03-25 | åŗå ¶å® | Ceramic spray drying tower |
-
2015
- 2015-06-04 DK DKBA201500077U patent/DK201500077U4/en active
-
2016
- 2016-06-03 DK DK16729186.3T patent/DK3303957T3/en active
- 2016-06-03 WO PCT/DK2016/050162 patent/WO2016192737A1/en active Application Filing
- 2016-06-03 EP EP16729186.3A patent/EP3303957B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
DK201500077U4 (en) | 2016-06-10 |
EP3303957A1 (en) | 2018-04-11 |
DK3303957T3 (en) | 2019-07-15 |
WO2016192737A1 (en) | 2016-12-08 |
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