Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
  • F27D99/00—Subject matter not provided for in other groups of this subclass
• • 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
  • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
  • B01J2/14—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic in rotating dishes or pans
• • 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
  • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
  • B01J2/24—Obtaining flakes by scraping a solid layer from a surface
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F9/00—Making metallic powder or suspensions thereof
  • B22F9/02—Making metallic powder or suspensions thereof using physical processes
  • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
  • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
  • B22F9/10—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying using centrifugal force
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
  • F27D9/00—Cooling of furnaces or of charges therein

Definitions

• the invention relates to an apparatus for cooling and processing a molten product into a granulate product, which apparatus comprises:
• a support consisting of at least one substantially horizontal, disk-shaped element, arranged for rotation about a substantially vertical shaft,
• Such an apparatus is known from US-A-4,500,349 and is intended for producing a salt-coated metal granulate.
• the means for depositing the molten product provide this product on the support in a thin layer. After the product has solidified, it is removed from the support with a scraper, and the solidified product is broken and crumbled to obtain the desired granulate form. This may lead to dust formation, which may necessitate the provision of an enveloping case.
• the support is cooled at the upper and lower sides by means of a fluid passing over the product and the support in gaseous form. It has also been proposed to cool the lower side of the support by means of a liquid to be jetted against it.
• the object of the invention is to improve an apparatus of the type described in the opening paragraph in such a manner that with a compact apparatus any product can be processed with a minimum of dust formation problems and with good cooling possibilities without the risk of contact between processed product and coolant.
• the cooling means comprise cooling liquid channels closed in themselves that form part of the disk-shaped element and, without connection with the environment, connect to feed and discharge means for cooling liquid.
• the advantages of a horizontal supporting face and a closed cooling system are combined by opting for a rotating horizontal displacement, the disk-shaped support being provided with internal cooling channels, i.e. a closed cooling system instead of spray nozzles.
• the disk-shaped design of the support also means a relatively compact construction that, partly due to the closed cooling system, can readily be provided with a casing, if desired, for instance because the solidification of the molten product involves formation of gases that should be kept from the environment, or for instance because an oxygen-sensitivity of the product requires operating in an inert atmosphere.
• the cooling channels can be provided in many ways . However, in accordance with a further embodiment of the invention, it is preferred that per disk-shaped element two interlocking, spiral-shaped cooling liquid channels are present, each spiral-shaped channel having an outer end and an inner end, and one spiral-shaped channel having an inlet for cooling liquid located adjacent its outer end and an outlet for cooling liquid located adjacent its inner end, whereas for the other spiral-shaped channel this is the other way round, with feed and discharge means for the cooling liquid extending centrally through the disk-shaped element .
• the continuous flow-through of the cooling channels can be realized in a relatively simple manner. Further, it is not only possible to optimally cover the surface of the disk-shaped element, but also to effect a maximally uniform change of cooling temperature throughout the surface by feeding the two channels in counterflow. In this connection, in accordance with a further embodiment of the invention, it ' is preferred that the inlets as well as the outlets of the two channels connect to an annular channel in the vertical shaft .
• cooling channels in the support can be realized in many known manners.
• the support is composed of a disk-shaped supporting platform and a thin plate attached locally to the lower side thereof, which plate, after attaching, is bulged by pressurizing by means of a fluid the space between the supporting platform and the thin plate in the regions between the local attachments, while the thin plate is preferably attached to the supporting platform through laser welding.
• the means for depositing the molten product on the support comprise a dispenser adapted to dispense the molten product batchwise or dropwise.
• the support is designed as an annular element, then, in accordance with a further embodiment of the invention, the dispenser is preferably designed so as to be capable of dispensing the molten product in sectors .
• the application of a disk-shaped element as support has the advantage of a compact constructional form.
• the support consists of a number of disk-shaped elements, vertically arranged one above the other, each comprising cooling channels, disperser means and means for removing the solidified product in granulate form.
• a relatively large treating surface can be realized in a relatively small space, which has the further advantage that, if so desired, the support can be surrounded by a casing shutting off this support from the environment, which casing has a fairly small size.
• Fig. 1 shows, partly in elevation and partly in section, an apparatus according to the invention
• Fig. 2 shows a section taken on the line II-II in
• Fig. 3 shows, in bottom view, a support applied in the apparatus according to Fig. 1;
• Fig. 4 shows a section taken on the line IV-IV in Fig. 3.
• the apparatus shown in Fig. 1 comprises a support 1 having cooling channels 2, a dispenser 3 and a scraping device 4.
• the support 1 is mounted on a hollow shaft 5, wherein a second hollow shaft 6 extends concentrically.
• the assembly of the shafts 5 and 6 and the support 1 is accommodated in a fixedly arranged encasing 8 so as to be rotatable by means of a driving gear 7.
• the hollow shaft 5 further carries the dispenser 3 mounted so as to be pivotable to and fro through a specific path around the shaft 5 by driving means not further shown.
• the rotatable, hollow shaft 6 is connected with a fixedly disposed coolant supply 9, while the annular space between the jointly rotatable shafts 5 and 6 communicates, via a coupling, with a fixedly disposed coolant drain 10. Coolant fed via the hollow shaft 6 is passed to the cooling channels 2 by means of an annular channel and a feed line 11 or 26 connecting thereto, and returned, via a discharge line 12 or 18, to an annular channel communicating with the annular hollow space between the shafts 5 and 6.
• the dispenser 3 comprises a dispensing member 13 in the form of a sector of a circle.
• the dispensing member 13 comprises a large number of dispensing openings 14, enabling a sector of the support 1 to be supplied, in one operation, with a molten product to be processed, deposited batchwise in a particular pattern.
• the scraping device 4 comprises a blade carrier 15, connected with a carrying tube 17 by ears 16.
• One extremity of the carrying tube 17 is bearing-mounted in a rectangular frame 19 located outside the fixedly disposed encasing 8, which frame 19 is left out in Fig. 1, while the other extremity finds support in a shaft 20, which is in turn supported by the frame 19 again.
• Figs 3 and 4 show the support 1 with cooling channels 2.
• the support 1 is composed of an annular element 21 provided with a hub part 22 at its central opening and with a collar part 23 at its outer edge.
• a thin plate 24 is attached by means of laser welds 25 in such a pattern that the regions located between the weld seams have a double spiral-shaped configuration, with the ends of the two spirals located opposite each other.
• the regions between the laser welds are inflated under pressure by means of a fluid to form a double spiral- shaped cooling channel 2 due to the bulging of the thin plate 24 between the .laser welds 25.
• the feed line 11 divides into a part 11a and a part lib.
• the part 11a extends to the outer starting region of one spiral-shaped channel 2, while the part lib further on terminates in the same channel 2, connecting to the discharge line 18 near its inner end.
• the other spiral- shaped channel is fed near its inner end by the feed line 26, while the discharge takes place through the line parts 12a and 12b, meeting in the discharge line 12.
• the coolant flows in opposite directions in the two channels, which, partly in view of the disposition of the supply and the drain and the material thickness of the annular element 21, ensures a maximally even temperature distribution over the support, so that all product deposited on the annular element, dropwise or batchwise, is cooled down to the same extent .
• the support 1 is first brought to the desired temperature by means of the cooling system.
• the dispenser 3 pivotable to and fro, the product to be processed is deposited in liquid form on the top surface of the continuously rotating support 1, where the cooling action of the support provides that the product solidifies, which product is then removed from the support 1 by the scraping device 4 and ends up in a receiving device not further shown.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Physical Or Chemical Processes And Apparatus (AREA)
• Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
• Glanulating (AREA)
• Formation And Processing Of Food Products (AREA)
• Fertilizers (AREA)
• Agricultural Chemicals And Associated Chemicals (AREA)
• Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
• Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=19864083

Family Applications (1)

Country Status (9)

Cited By (1)

Families Citing this family (5)

Citations (5)

Family Cites Families (3)

• 1994
  • 1994-04-18 NL NL9400618A patent/NL9400618A/nl not_active Application Discontinuation
• 1995
  • 1995-04-18 US US08/727,410 patent/US5772187A/en not_active Expired - Lifetime
  • 1995-04-18 ES ES95914579T patent/ES2120195T3/es not_active Expired - Lifetime
  • 1995-04-18 DK DK95914579T patent/DK0796141T3/da active
  • 1995-04-18 JP JP7526878A patent/JPH10502294A/ja active Pending
  • 1995-04-18 EP EP95914579A patent/EP0796141B1/en not_active Expired - Lifetime
  • 1995-04-18 WO PCT/NL1995/000138 patent/WO1995028226A1/en active IP Right Grant
  • 1995-04-18 AT AT95914579T patent/ATE167815T1/de not_active IP Right Cessation
  • 1995-04-18 DE DE69503257T patent/DE69503257T2/de not_active Expired - Fee Related

Patent Citations (5)

Non-Patent Citations (2)

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