FI102782B - steam dryers - Google Patents

Description

The present invention relates to a steam dryer, in particular for drying concentrates, comprising a drum having a plurality of concentric tubular ring rings disposed radially across the drum and extending substantially radially across the main drum, the steam dryer comprising feed means for drying material 10 as well as drying means for removing material and steam supply channels and condensate and degassing means, wherein the steam in the steam dryer is adapted to be introduced into the steam piping inside the steam dryer through steam on the center shaft.

Steam dryers are known in the art, and dryers 15 are used, for example. for drying various concentrates. In this type of steam dryer, the desiccant is placed inside a drum or the like, and the drying steam passes through tubes placed inside the drum. This will prevent the drying agent from coming into direct contact with the steam.

Drum steam dryers are known in the art in which the steam pipes are generally disposed along the axis of the drum. In some of these applications, the insulating layer of material to be dried on the surface of the steam pipes has proved problematic. In prior art dehumidifiers using longitudinal tubes, the equipment has a relatively low fill rate, about 10-15% of desiccant per 25 drum internal volume, and is not commonly used for drying concentrates due to its large size and low efficiency.

Arrangements with a separate rotor forming a heating surface and surrounded by a horizontally stationary fixed tank 30 are also known in the art. The rotor is made up of a plurality of parallel tube groups arranged along a central tube. Each tube group comprises a plurality of concentric tube rings and the heat transfer medium used may be steam or liquid. In this known solution 102782 2, the steam piping rotating in the desiccant concentrate bearing inside the steam dryer sets a size limit and cannot be economically increased as the concentrate level increases. In addition, in this arrangement, the wear of the steam tubes causes great problems in drying the abrasive concentrates.

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The object of the invention is to provide a steam dryer which is particularly suitable for drying concentrates and which can utilize the steam generated in other concentrate processing processes.

It is a further object of the invention to provide a solution in which wear is eliminated or at least minimized and that no insulating concentrate layer is formed on the surface of the steam pipes.

A further object of the solution according to the invention is to obtain a device structure which is not limited in size but can be manufactured to a desired concentration of concentrate.

In order to achieve the foregoing and further objects, the steam dryer according to the invention is essentially characterized in that the steam dryer drum and the steam piping formed within the plurality of concentric tubular ring groups within it are rotatably actuated by means of supporting means.

In the arrangement according to the invention, the steam piping rotates with the drum and the longitudinal lifting vanes on the inner surface of the drum eliminate excessive sliding of the material on the surface of the drum, whereby the wear of the

In the dryer according to the invention, the material to be dried is introduced into the drum 30 by a screw conveyor at a certain distance from the end, which facilitates drying and prevents caking. Before starting the drying, dry 102782 3 and hot initial drying material are formed inside the dryer, which mixes the wet article to be dried as it is fed to the dryer, further reducing the risk of caking. The dryer is provided with an overflow edge over which the material is discharged, while providing the overflow edge with sufficient material retention in the dryer and at the same time a sufficient degree of filling. 5 In addition, the drum is rotatable in both directions to compensate for possible wear.

In the arrangement according to the invention, a high drying efficiency is achieved because the fill rate is as high as possible and the drum is filled with steam pipes. In the dryer of the invention, more than 30% fill material may be used to dry the interior volume of the drum.

The steam dryer drum of the invention may also be in an inclined position, either downwards or upwards, to enhance the movement of the article or to increase the delay in the dryer.

In the following, the invention will be described in more detail with reference to the figures in the accompanying drawings, the details of which, however, are not intended to be limited in any way.

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Figure 1 is a schematic cross-sectional view of a steam dryer and Figure 2 is a schematic cross-sectional view of a steam dryer.

1 and 2, the wet concentrate to be dried is fed to a steam dryer 10 .. through a hopper 11 to a feed screw 12, from where it is fed into the drum 17 at distances from the feed end 9 of the drum 17 to a distance of 1-2 m, preferably 1.5 m A steam conduit 18 is disposed within the drum 17, into which the steam is conducted through the conduit 21 and through the rotary steam connector 22. The steam is introduced into the feed tube 21 30 preferably from the steam generating step of the concentrate treatment process. Steam conduit 18 is formed by a plurality of nested concentric vapor conduit rings 102782 4, which are disposed about a vapor distributor 27 at a short distance L-2 over substantially the entire length of the drum 17. The distance L2 is 50 - 300 mm, preferably 80 - 150 mm. The tubes of the steam piping 18 at the end of the drum 17 on the supply screw 12 are preferably bent away from the end, thereby allowing the supply screw 5 12 to reach a desired distance from the inlet end 9 of the interior of the drum 17. 20 along the filter. The drum 17 and the tubing 18 rotate supported by the carrier rollers 28 through the gear wheel 29 and the gear ring 15. The driving force of the rotation is obtained, for example, by means of a drive motor 10 and a gear gear 14. The carriers 17 of the drum 17 are designated by reference numeral 16 and the axial support rollers by reference numeral 19. On its inner surface 17, it is discharged 15 over an adjustable overflow edge 24 into a discharge screw 25, resulting in a dried concentrate indicated by a reference arrow 26. The angle of inclination α of the drum is adjustable and can be from + 2 ° to -5 °, preferably from -1 ° to -3 °. The slope angle, the adjustable rotation speed and the adjustable overflow edge 24 make the concentrate drying delay in the steam dryer 10 adjustable.

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The invention has been described above only with reference to a preferred embodiment thereof, the details of which, however, are not intended to be narrowly limited. Many modifications and variations are possible within the scope of the inventive idea defined in the following claims.

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Claims (12)

102782 5 A steam dryer, in particular for drying concentrates, comprising a drum (17) housed within a steam conduit (18) consisting of a plurality of concentric tubular ring groups transverse to the drum, spaced substantially apart from the end of the steam manifold (27). (17) over the entire length, and comprising a steam dryer (10) comprising desiccant supply means (11,12) and a desiccant discharge means (24,25) and a steam supply means (21,22) and condensate and degassing means (23,20), the steam in the steam dryer (10) 10 being adapted to be fed to the steam pipeline (18) inside the steam dryer (10) via a steam distributor tube (27) on the central axis, characterized in that said drum (17) ) are adapted to rotate actuators during drying together en (13,14,29,15) supported by the support means (28,16). 15 Steam dryer according to Claim 1, characterized in that said support means comprise support rings (16) and carrier rollers (28) arranged in connection with the steam dryer (10) for supporting the drum (17) and the steam pipe (18) as they rotate. 20 Steam drier according to claim 1 or 2, characterized in that said actuators comprise a gear ring (15) arranged on the outer surface of the drum (17) and a gear (29) through which the actuator (17) and the steam pipe are supplied by the actuators (13,14). (18) is adapted to be rotatable. 25 Steam drier according to one of the preceding claims, characterized in that the steam distribution pipe (27) is connected to the steam supply duct (21) via a rotary steam connector (22). 102782 6 Steam drier according to one of the preceding claims, characterized in that the steam drier (10) is disposed in a horizontal position with an inclination angle (a) of + 2 ° to 5 °. Steam drier according to one of the preceding claims, characterized in that the desiccant supply means comprises a feeding screw (12) arranged to extend within the steam dryer (10) inside the drum at a distance (Lj) from the inlet end (9) of the steam drier (10). Steam dryer according to one of the preceding claims, characterized in that longitudinal lifting vanes (30) are mounted on the inner surface of the drum (17) of the steam dryer (10). Steam dryer according to one of the preceding claims, characterized in that the dried material removal means of the steam dryer (10) comprises an adjustable overflow edge (24) for controlling the amount of dried material discharged. Steam dryer according to one of the preceding claims, characterized in that the dried material removal means comprise a discharge screw (25). 20 Steam drier according to one of the preceding claims, characterized in that the speed of rotation of the steam drier (10) is adjustable and that the steam drier (10) is rotatable in both directions. A steam dryer according to any one of the preceding claims, characterized in that the steam used in the dryer (10) is steam generated at another stage of the concentrate treatment process. Steam drier according to one of the preceding claims, characterized in that the steam duct (27) of the steam ring duct (18) on the supply end (9) of the drum (17) on the steam drier (10) is bent away from the feed (9) of the drum (17). . • · 102782 8 1. Frozen whiskers, frying torkning av slig, flashing frying omfattar en trumma (17), flashing feathers (18), flashing frictional control system (18), flashing friction and friction control. i tvärriktning i Hänseende account drum omkring et ängfördelningsrör (27) head frän varandra över väsentligen hela längden av drum (17) och vilken ängtorkare (10) omfattar organ (11,12) för inmatning av materialet som skall torkas organ (11) 25) flashing the material material and the channel (21,22) flashing the material (23,20) flashing the condensate and gas, (10) flashing the system (18). via ängfördelningsröret (27), som fmns pä measuringxeln i ängtorkaren (10), kännetecknad därav, att ängtorkarens (10) short (17) och det nämnda av flera concentric rörringsgruppperet (18) inne i denna är nordnade att rotera tillsammans under torkningen genome förmedling av funktionsanord-15 ningar (13,14,29,15) uppbuma av stödorgan (28,16). 2. Anchoring device 1, anchoring device, such as an organ driver (17) an anchor device (10) an anchor device (16) an anchor device (28) an anchor device (17) an anchor device (17) an anchor device (17) 20 rotations. 3. Predicting enligt patent kravet 1 eller 2, kangnetecknad därav, att such functions as an omffattar en head yttre ytan av drumman (17) anordnad kuggkrans (15) och et kugghjul (29), genome förmedling av vilgr drumman (17) och met (18) förmedling av drivkraft erhällen frän funktionsanordningar (13,14). 4. The patented engraving of a patent engraving, an anatomy of a patch, the attagnings (27) or the medication (21) of the inmate and the rotation of the genome (22). 102782 9 5. Ängtorkare enligt nägot av de föregäende patentkraven, kännetecknad därav, att ängtorkaren (10) and placerad i lutande ställning i förhällande account horisontal-riktningen, colors lutningsvinkeln (a) + 2 ° to -5 °. S 6. Ängtorkare enligt face av de föregäende patentkraven, kännetecknad därav, att organen för inmatning av materialet som scall prick omfattar en matarskruv (12), som anordnad att sträcka sig in i trumman av ängtorkaren (10) account et avständ frän en inmatningsgavel (9) on ängtorkaren (10). 7. The patent engraving of the larynx enligt face, the tongue and groove, the lingerness lyrftskovlar (30) and the monterade head in the yrt av drumman (17) or the laryngeal lance (10). 8. Ängtorkare enligt nägot av de föregäende patentkraven, kännetecknad 15 därav, att organen för utmatning av det torkade materialet i ängtorkaren (10) omfattar en account för reglerbar överrinningskant (24) för regiering av playden av torkat material som mätäs ut. (25) 9. The proprietary engraving of a patent patent craven, a tongue-and-groove device 20, att organen för utmatning av detarkade materialet omfattar en utmatningsskruv (25). 10. The rotary bar and the rotary bar (10) 25 can rotatoras and need to be rictning. * * 11. The name of the patent engraving, the patent for the use of the patent, the att som som används i the ag tor (10) and the som alstras in the skede av en sligbehandlingsprocess. 30 102782 10 12. Angtorkare enligt face av de föregäende patentkraven, kännetecknad därav, att de mot ängfördelningsröret (27) belägna rören av en rörringsgrupp av ängrörssystemet vid inmatningsgaveln (9) av drumman (17) av ängtorkön (10) av drumman (17). 5