EP0114939B1 - Dispositif pour sécher et refroidir du sucre finement cristallin en particulier du fructose - Google Patents

Dispositif pour sécher et refroidir du sucre finement cristallin en particulier du fructose Download PDF

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Publication number
EP0114939B1
EP0114939B1 EP83110553A EP83110553A EP0114939B1 EP 0114939 B1 EP0114939 B1 EP 0114939B1 EP 83110553 A EP83110553 A EP 83110553A EP 83110553 A EP83110553 A EP 83110553A EP 0114939 B1 EP0114939 B1 EP 0114939B1
Authority
EP
European Patent Office
Prior art keywords
drum
air
hot
air pipe
approximately
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.)
Expired
Application number
EP83110553A
Other languages
German (de)
English (en)
Other versions
EP0114939A3 (en
EP0114939A2 (fr
Inventor
Gerd Laske
Bruno Pöschel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BMA Braunschweigische Maschinenbauanstalt AG
Original Assignee
BMA Braunschweigische Maschinenbauanstalt AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BMA Braunschweigische Maschinenbauanstalt AG filed Critical BMA Braunschweigische Maschinenbauanstalt AG
Publication of EP0114939A2 publication Critical patent/EP0114939A2/fr
Publication of EP0114939A3 publication Critical patent/EP0114939A3/de
Application granted granted Critical
Publication of EP0114939B1 publication Critical patent/EP0114939B1/fr
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C13—SUGAR INDUSTRY
    • C13B—PRODUCTION OF SUCROSE; APPARATUS SPECIALLY ADAPTED THEREFOR
    • C13B40/00—Drying sugar
    • C13B40/002—Drying sugar or syrup in bulk
    • C—CHEMISTRY; METALLURGY
    • C13—SUGAR INDUSTRY
    • C13K—SACCHARIDES OBTAINED FROM NATURAL SOURCES OR BY HYDROLYSIS OF NATURALLY OCCURRING DISACCHARIDES, OLIGOSACCHARIDES OR POLYSACCHARIDES
    • C13K11/00—Fructose

Definitions

  • the invention relates to a device for drying and cooling fine-crystalline sugar, especially fructose, in a countercurrent process with a rotating cylindrical drum, in which the inside of the drum wall is equipped with lifting blades, and with a concentric and rotatable warm air tube which protrudes in sections into the drum and is located on the outside of the drum End can be connected to a hot air blower and is open at the inside of the drum and outside of the warm air pipe and coaxially with this cooling air is blown into the drum.
  • the drum consists of two drum sections of different diameters.
  • the central hot air tube with a length corresponding to this drum section projects into the drum section with the larger diameter.
  • the drum section with a smaller diameter is connected, which, however, is larger than the diameter of the hot air tube.
  • a cold air blower is provided on the same side of the drum, which supplies cooling air to the drum outside the warm air pipe. The warm air flows from the outlet of the warm air tube through the drum section with the smaller diameter to the end of the drum, at which the wet sugar feed is provided.
  • the entire drum is divided into a drying zone and a cooling zone, the length of the drying zone being essentially determined by the length of the smaller diameter drum section and the length of the cooling zone is essentially determined by the length of the larger diameter drum section.
  • Lifting vanes are attached to the inside of both drum sections, so that the wet sugar added at the end of the drum first passes through the drum section with a smaller diameter and then through the section with a larger diameter. Since both the warm air and the cold air flow in the same direction, the sugar is conveyed in counter-current flow, passing first through the drying zone and then through the cooling zone before falling out at the blower end of the drum.
  • drum sections of different diameters are required, which results in an increased manufacturing outlay.
  • a complicated arrangement for the annular discharge of the cold air is required in this device.
  • the solution to the problem is characterized in that the mixing of cooling and hot air in front of the open end of the hot air pipe and at a distance from it two air guiding devices, each arranged in a radial manner and extending to the longitudinal axis of the drum with approximately the same inclination, the radial ends of which are provided axially planes offset from one another are held, and that the guide plates of the two air guide devices are inclined towards one another and mesh with one another in a comb-like manner.
  • the air guiding devices in front of the opening of the warm air pipe mix the air emerging from the warm air pipe with the cold air flowing coaxially therewith.
  • the warm air has a temperature of approximately 120 ° C. and the cooling air has a temperature of approximately 10 ° C.
  • Behind the air guiding devices as seen in the direction of the air flows, there is an air temperature of approximately 70 ° C a. Consequently, the drum is divided into a cooling zone and a drying zone by the air guiding devices.
  • the cooling zone with the air at about 10 ° C is arranged concentrically to the warm air pipe, while the air temperature of about 70 ° C is distributed over almost the entire cross-section and the length of the drying zone.
  • the mixing of the air takes place essentially in that one of the air guiding devices, due to the inclination of its guide plates, deflects the hot air flowing out of the warm air pipe in the radial direction towards the drum wall, while the cold air flowing coaxially to the warm air pipe is deflected radially towards the longitudinal axis of the drum.
  • one of the air guiding devices due to the inclination of its guide plates, deflects the hot air flowing out of the warm air pipe in the radial direction towards the drum wall, while the cold air flowing coaxially to the warm air pipe is deflected radially towards the longitudinal axis of the drum.
  • baffles distributed on the drum wall, intensive mixing of the hot and cold air is achieved and the required mixing temperature is reached directly behind the air baffle, so that drying of the sugar is possible over a long length of the drying zone.
  • the sugar introduced into the drying zone at the end of the drum is caught by the lifting blades when the drum rotates and is conveyed through the drying zone against the flowing air. Since the baffles of the air guiding devices at their ends facing the drum wall allow the sugar to pass along the drum wall, this can be grasped by the lifting vanes in the cooling zone in order to reach an outlet opening at the end to flow against the direction of the cold air.
  • the drum, the hot air pipe and the cooperating air guiding devices are rigidly connected to one another so that they can rotate together. The air guiding devices thus form a static mixer.
  • the baffles are preferably trapezoidal and form approximately a closed radial plane in the axial projection.
  • the trapezoidal shape of the guide plates can be chosen so that their width increases in the radial direction to the outside.
  • the baffles of the two air control devices are so close together in the intersection that they almost touch. In this way, neither the warm air emerging from the warm air pipe nor the cooling air can flow unhindered in the longitudinal direction of the drum. Rather, the turbulence in the area of the two air guiding devices ensures intensive mixing of the air components of different temperatures.
  • the ends of the guide plates directed toward the longitudinal axis of the drum are each held radially symmetrically on a central disk in the case of both air guide devices, the diameter of which is smaller than the inside diameter of the hot air pipe.
  • the central disks are each self-supporting and are only supported by the air baffles.
  • the diameter of the disks was chosen to be smaller than the inside diameter of the hot air pipe, so that the air flowing out of the hot air pipe can flow essentially in the direction of the inclined guide plates and does not encounter excessive air resistance.
  • the central disk facing the warm air pipe in a ring shape.
  • a further improvement in the flow of warm air in the longitudinal direction of the drum is achieved and the air resistance of the air guiding device is further reduced.
  • the central disk facing away from the hot air tube represents a closed circular area so that the air flowing out of the hot air tube cannot get unimpeded and therefore can reach the drying zone of the device directly at an excessively high temperature.
  • lifting blades that are inclined in the longitudinal direction of the drum and connected to the drum wall on the long side between the ends of the guide plates directed towards the drum wall.
  • These lifting blades can be connected on the end face to the ends of the guide plates directed towards the drum wall, so that a connection of the guide blades of both air-guiding devices is achieved.
  • the inclination of these lifting blades is selected so that the sugar can be transported quickly through the area of the two air guiding devices, so that the risk of the sugar overheating due to the air emerging from the hot air pipe is avoided.
  • the baffles have an approximately U-shaped cross section. This enables a small wall thickness of the guide plates with high strength. At the same time, the flow conditions can be favorably influenced by the U-shape of the baffles.
  • the guide plates are inclined at an angle of approximately 45 ° with respect to the longitudinal axis of the drum.
  • the baffles of one air baffle are inclined relative to the baffles of the other air baffle approximately at an angle of 90 °.
  • the device shows a device according to the invention for drying and cooling fructose in a countercurrent process.
  • the device consists of a rotating cylindrical drum 1, on the inside of which lifting blades 2 are attached.
  • 2 and 3 indicate that the lifting blades 2 are arranged at equal intervals in the circumferential direction.
  • the lifting blades 2 are arranged offset from one another, so that the amount of fructose captured by a lifting blade is distributed over two lifting blades or vice versa during further transport in the longitudinal direction of the drum. This results in an intensive mass transfer and thus good heat conduction of the fructose to be dried, which has a favorable influence on the drying process.
  • the bearings 3 and 4 serve to support the rotatable drum 1.
  • a central warm air pipe 5 is shown, which projects into the drum 1.
  • the warm air pipe 5 can be connected to a warm air blower, not shown.
  • the hot air generated by the hot air blower is blown along the arrow 6 through the hot air pipe 5 into the drum.
  • a cold air blower also not shown, is provided, which can be connected to the ring section of the drum 1, which is concentric with the warm air pipe 5, so that the cold air flows through the annular Pipe section of the drum 1 can flow in the direction of arrow 7.
  • the air baffle 8 consists of baffles 10 arranged radially and with the same inclination to the longitudinal axis of the drum, the radial ends of which are held in axially offset planes.
  • the ends of the guide plates 10 directed in the direction of the drum axis are attached to a central disk 12 in a radially symmetrical manner.
  • the ends of the guide plates 10 directed towards the drum wall are connected to the drum wall via cuts 14.
  • the air guiding device 9 is constructed in the same way as the air guiding device 8 and consists of baffles 11 which are supported in a self-supporting manner at their ends directed towards the drum axis and are connected to sheet metal sections 15 at their ends directed towards the drum wall.
  • the disk 12 lies approximately in the same radial plane as the sheet metal sections 15, while the disk 13 is arranged approximately in the radial plane of the sheet metal sections 14.
  • the diameter of the disks 12 and 13 is selected so that the guide plates 10 and 11 are inclined relative to one another by an angle of approximately 90 ° and thus in relation to the longitudinal axis of the drum in each case by an angle of approximately 45 °. Due to identical baffles 10 and 11, the air baffles 8 and 9 also correspond, which are directed towards each other and mesh like a comb.
  • FIG. 1 shows a top view of the air guiding devices 8 and 9 in the direction of the longitudinal axis of the drum. It can be seen here that the guide plates 10 and 11 have a trapezoidal shape and almost form a closed surface in their axial projection. 4 reveals that the central disk 12, which is connected to the ends of the guide plates 10 and faces the open end 5a of the hot air pipe 5, has an annular shape, so that the air flowing out of the hot air pipe 6 does not reach one bouncing surface perpendicular to the direction of flow and significantly increasing the air resistance.
  • the static mixer rotating with the drum 1, which consists of the air guiding devices 8 and 9, ensures that the cooling air emerging from the warm air pipe and the concentrically flowing cooling air are mixed.
  • the warm air flows out of the warm air pipe 5 at a temperature of approximately 120 ° C.
  • the concentrically flowing air has a temperature of around 10 ° C.
  • Intensive mixing of these two air quantities of different temperature by the air guiding devices 8 and 9 results in a largely uniform air temperature of about 70 ° C. in the left part of the drum 1 between its free end 1 a and the mixer.
  • This section of the drum 1 thus represents a drying zone, while the right section of the drum 1 between its end 1 b and the mixer acts as a cooling zone.
  • lifting blades 16 and 17 which are inclined relative to the longitudinal axis of the drum and which, when the drum 1 rotates in the direction of the arrow 18 according to FIG. 3, allow the fructose to be transported rapidly through the area turbulent air flows. This prevents the fructose from melting and adhering to the guide plates 10 and 11.
  • the task of the material to be dried in the inclined and rotating drum 1 takes place at the end 1a. From there, the material passes through inclined lifting blades into the chambers formed by the lifting blades 2, as can be seen particularly from FIG. 3. Here, the goods are transported against the air flow, which results in an extended time in the drying zone and thus good drying.
  • the dried material passes through the area of the air guiding devices 8 and 9 along the drum wall, whereby it is guided by the lifting blades 16 and 17.
  • the material then reaches the cold air zone and is picked up again by lifting blades 2.
  • the cooled material is removed from the drum 1 at the end 1 b.
  • the drum does not need to be divided into two longitudinal sections of different diameters, in contrast to the known solutions. Rather, both the drying zone and the cooling zone can be accommodated in a common drum with the same diameter. There are also no air openings along the drum wall, for example for removing the cold air.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Organic Chemistry (AREA)
  • Drying Of Solid Materials (AREA)

Claims (7)

1.- Dispositif pour sécher et refroidir un sucre finement cristallin, notamment du fructose, selon le procédé à contre-courant avec un tambour cylindrique rotatif, dont la paroi est munie à l'intérieur d'aubes élévatrices et avec un tuyau d'air chaud concentrique et tournant en même temps que le tambour et pénétrant dans celui-ci sur une portion de sa longueur, lequel tuyau peut être relié par son extrémité située à l'extérieur du tambour avec une soufflante d'air chaud, et qui est ouvert à son extrémité située à l'intérieur du tambour, de l'air froid étant soufflé dans le tambour à l'extérieur du tuyau d'air chaud et coaxialement à celui-ci, caractérisé en ce qu'on prévoit, pour mélanger l'air froid et l'air chaud, devant l'extrémité ouverte (5a) du tuyau d'air chaud (5) et à une certaine distance de celle-ci, deux dispositifs de guidage d'air (8,9) comportant respectivement des plaques de guidage (10, 11) disposées en rayons et ayant sensiblement la même inclinaison par rapport à l'axe longitudinal du tambour, plaques dont les extrémités radiales sont maintenues dans des plans décalés l'un par rapport à l'autre dans le sens axial, et les plaques de guidage (10, 11) des deux dispositifs de guidage d'air (8, 9) sont inclinées les unes vers les autres et s'interpénètrent à la façon d'un peigne.
2. - Dispositif selon la revendication 1, caractérisé en ce que les plaques de guidage (10, 11) sont de forme trapézoïdale et forment en projection axiale, sensiblement un plan radial ferme.
3. - Dispositif selon la revendication 1 ou 2, caractérisé en ce que les extrémités des plaques de guidage (10, 11) orientées vers l'axe longitudinal du tambour sont maintenues, dans les deux dispositifs de guidage d'air (3, 9) respectivement d'une façon radialement symétrique sur un disque central (12, 13) dont le diamètre est plus petit que le diamètre intérieur du tuyau d'air chaud (5).
4. - Dispositif selon la revendication 3, caractérisé en ce que le disque central (12) tourné vers le tuyau d'air chaud (5) est de forme annulaire.
5. - Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'on prévoit entre les extrémités des plaques de guidage (10, 11) des aubes élévatrices (16, 17) inclinées s'étendant dans le sens longitudinal du tambour et reliées sur le côté longitudinal avec la paroi du tambour.
6. - Dispositif selon l'une des revendications précédentes, caractérisé en ce que les plaques de guidage (10, 11) ont une section transversale sensiblement en forme de U.
7. - Dispositif selon l'une des revendications précédentes, caractérisé en ce que les plaques de guidage font un angle d'environ 45° avec l'axe longitudinal du tambour.
EP83110553A 1982-12-04 1983-10-22 Dispositif pour sécher et refroidir du sucre finement cristallin en particulier du fructose Expired EP0114939B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19828234134U DE8234134U1 (de) 1982-12-04 1982-12-04 Vorrichtung zum trocknen und kuehlen von feinkristallinem zucker, insbesondere fructose
DE8234134U 1982-12-04

Publications (3)

Publication Number Publication Date
EP0114939A2 EP0114939A2 (fr) 1984-08-08
EP0114939A3 EP0114939A3 (en) 1984-12-19
EP0114939B1 true EP0114939B1 (fr) 1986-09-03

Family

ID=6746222

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83110553A Expired EP0114939B1 (fr) 1982-12-04 1983-10-22 Dispositif pour sécher et refroidir du sucre finement cristallin en particulier du fructose

Country Status (2)

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EP (1) EP0114939B1 (fr)
DE (2) DE8234134U1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0338099B1 (fr) * 1988-04-16 1993-07-14 Braunschweigische Maschinenbauanstalt AG Procédé de séchage et de refroidissement de masses de sucre cristallines humides et installation pour la mise en oeuvre de ce procédé
KR101035851B1 (ko) * 2008-07-04 2011-05-19 주식회사 멘도타 방사형 로터리 건조장치

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE281643C (fr) *
DE1161820B (de) * 1959-09-23 1964-01-23 Buettner Werke Ag Vorrichtung zur Gegenstromtrocknung und -kuehlung von Weisszucker
DE1245330B (de) * 1962-03-20 1967-07-27 Boliden Ab Vorrichtung zur Behandlung von festem, feinkoernigem oder pulverfoermigem Material mit Fluessigkeit und/oder Gas
FR1472759A (fr) * 1966-03-29 1967-03-10 Buettner Werke Ag Dispositif pour le séchage et le refroidissement du sucre blanc à contre-courant
GB1133543A (en) * 1967-02-06 1968-11-13 Bartlett Snow Pacific Inc Combination dryer and cooler

Also Published As

Publication number Publication date
DE3365889D1 (en) 1986-10-09
EP0114939A3 (en) 1984-12-19
DE8234134U1 (de) 1983-05-26
EP0114939A2 (fr) 1984-08-08

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