FI79248C - Sugtorkningsanordning - Google Patents

Description

79248 Ί Suction dryer

Sugtorkningsanordning 5 The invention relates to a suction dryer device comprising a plurality of liquid suction filter plates and means for applying a vacuum to each filter plate to apply liquid suction to the material to be dried via the suction surface of the filter plates.

Known suction dryer devices comprise a horizontal axis of rotation to which the suction dryer plates are arranged. Each suction dryer plate is adapted to move into a basin of material to be dried, whereby the vacuum is adapted to engage the internal suction space of each plate and thus the suction surfaces. The material to be dried adheres to the surfaces of the suction plates and rises from the basin 15 as the shaft rotates towards the scraping station where the material adhering to the suction surface is removed.

The known device solutions are generally vertical in their filter surfaces, so that these solutions are not suitable for all materials.

20 If the material has such properties that, due to its specific gravity, particle size, particle shape or other reasons, it forms poorly or not at all a filter cake in a vertical position, then a horizontal or horizontal filter surface is necessary.

According to the invention, there is provided a suction dryer device which preferably also forms a filter cake for heavy materials.

The suction dryer device according to the invention is mainly characterized in that the suction dryer device comprises a plurality of overlapping groups of plates 30, each with a plurality of horizontal filter plates arranged on a circular sector and preferably import channels through which the material to be silenced is imported from the pool or the like.

2 79248 1 The suction dryer device according to the invention may comprise several overlapping groups of plates, each filter group having filter plates arranged directly next to each other so as to form a uniform horizontal surface. The material to be filtered is preferably brought to each tile-5 group via import channels, and the material brought to the fresh station is leveled with a leveling device, e.g. a leveling ruler, to a layer of the desired thickness. The part of the material left over falls into the overflow trough below the tile group, from where the material is recirculated. According to the invention, liquid suction is applied to the material to be filtered at and after the import of the material to be filtered. The material rests on its own weight and is kept under vacuum by the surface of the filter plates. The axis of rotation rotates the plate groups and the material to be filtered passes almost a revolution after passing the filter cake removal station, from which the conveyor screw 15 or some other similar device moves the filter cake off the plate surface and preferably drops it from the outer circumference of the plate group to the conveyor. Preferably, one conveyor can be used for all filter plate groups. The filter plate then moves from the filter cake removal station to the washing station, where the overpressure of the washing liquid 20 is applied to the plate surface. In addition, mechanical filter media removers and / or other separate cleaning devices may be used. The cleaned tile then moves again to the import station for the material to be filtered.

The invention will now be described with reference to some preferred embodiments of the invention shown in the figures of the accompanying drawings, to which, however, the invention is not intended to be exclusively limited.

Figure 1 shows a suction dryer device according to the invention in a lateral cross-sectional view and in a partially schematic representation.

Figure 2 shows a suction dryer device according to the invention taken along the section line I-I in Figure 1.

Figure 3 shows a filter plate used in a suction dryer device according to the invention in a schematic representation and a cross-sectional view.

3 79248 1 Figure 4 is a schematic axonometric view of one group of slabs.

Figure 1 shows a suction dryer device 10 according to the invention in a partially schematic representation. The suction dryer device 10 comprises a plurality of adjacent suction dryer plates 13 with a horizontal suction surface, which plates are preferably arranged right next to each other. Each slab 13 is provided with its own suction channel 26 to provide suction to each slab 13 of the slab group at a particular filtration stage. Through these suction ducts, overpressure and rinsing water can also be produced for each slab as the slab reaches a certain rotation point during rotation.

The suction dryer device 10 comprises a rotation shaft 11 and preferably several Alek suction dryer device plate groups as shown in the figure, groups 12a, 12b, 12c 15 and 12d. It is clear that there may be more or less tile groups depending on the need for filtration. Each group of plates comprises a plurality of adjacent filter plates 13, to each of which a vacuum can be connected at a desired stage to suck the liquid out of the material to be filtered. The filter plates 13 are specifically water suction plates or liquid suction plates 20, which means that air or gas does not pass through the suction surfaces under the applied vacuum and that the plates are placed in hydraulic contact with the liquid of the material to be filtered. The suction plates are preferably made of microporous suction plates and most preferably of ceramic material.

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In Fig. 1, reference numeral 14 denotes a supply channel for the material to be dried. Each suction dryer tile group 12a, 12b, 12c and 12d has its own filter material import station A, whereby each tile group 12a, 12b, 12c and 12d is supplied with material to be dried via the duct 14 import channels 30a, 14b, 14c and 14d. The material to be dried or filtered is introduced by means of a pump 15 or some other conveyor, depending on the viscosity and other properties of the material to be filtered. As shown in the figure, the material to be filtered or dried is brought from the basin 16 or the like and is led through the inlet ducts 14a, 14b, 14c and 14d of the duct 35 in position A outside the device.

for the plate groups 12a, 12b, 12c and 12d inside the casing 17. The vacuum is adapted to engage position A of each suction dryer plate group 12

4 79248 ^ to or into the filter plate 13. When the vacuum is applied to the suction surface 13 'of each plate 13, the material to be dried introduced through the ductwork 14 is adhered to the plate surface 13'. This attachment is further facilitated by gravity. When the material 5 to be dried is guided through the inlet channels 14a, 14b, 14c ... to the surface 13 'of the plate 13 at or entering the position A, the material is leveled by a leveling device 23, e.g. a leveling ruler. It flattens a layer of filter material of the desired size and adjustability over the tile. Of course, this layer thickness can also be adjusted by adjusting the flow rate or amount of the filterable material introduced through the inlet channels 14a, 14b ... 10.

The shaft 11 is rotated as shown by the arrow and from the station A the baffle plates 13 of each plate group 12 move with the vacuum still applied to the suction surfaces 13 'of the plates 13 to the filter cake removal station h.

Below the slab groups I2a, I2b, 12c, '2d there is an overflow trough 18 into which, under the influence of gravity, the part of the material to be filtered and dried which did not fit during the feeding of the slabs 13 I' falls. 20 for suction surfaces 13 '.

From the overflow trough 18, the material to be filtered can be returned to the circulation via the overflow pipe 19 or the like. This transfer can • · take place by gravity or by a separate transfer device e.g.

• “25 by means of pump 19a, as shown in Fig. 1.

At the dried material removal station B, the material that came to the station is removed by means of filter cake removers, preferably conveyor screws 20. Filter cake removers, preferably conveyor screws, transfer the filter cake 30 from the plate 13 at the screw to the outer periphery of the plate 13, from where it falls further down to the conveyor, preferably the belt conveyor 21. Preferably, one belt conveyor can collect the dried material from each group of plates. After the filter cake removal station B, there is a filter surface washing station C. At the washing station C, an overpressure is applied to the plate surface. 35 The wash water is introduced in part through a corresponding duct when the liquid to be filtered is sucked out. The direction of flow of the washing liquid is then the opposite.

5 79248 1 The rinsing liquid is preferably water. It advantageously removes the residual material adhering to the filter surface. Washing station C may further comprise additional cleaning devices 22, such as a brush and / or an ultrasonic and / or infrasonic cleaner.

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The shaft 11 is rotated by a rotation motor 24 of the shaft 11. A distribution device 23, i.e. a distribution valve, is further connected to the shaft 11. The dispensing device 23, i.e. the dispensing valve, distributes the vacuum and / or the pressurized flushing liquid required for cleaning to each plate group and / or to the filter plate 13 of each suction dryer-10 plate group 12. The diameter of the plate table is 1.5-6 m, preferably 2-4 m.

Figure 3 is a schematic cross-sectional view of one filter plate 13. The filter plate 13 comprises a first filter material layer 15a 13a and a second filter material layer 13b adjoining it. Said first layer of filter material 13a is preferably of a finely porous and finer porous material than the so-called a second layer of filter material, i.e. a support layer 13b. The entire filter plate preferably rests on a support base 25 which is further fixed by a rib 25 'or the like 20 to a vertical axis 11 parallel to the ground field of attraction (arrow g). The vacuum is applied through the channel 26 to the suction surfaces 13 'so that the end of the channel 26 abuts the granular second filtration material 13b. The second filter layer material 13b comprises a granular material 13 ". The plate is preferably made entirely of ceramic material 25.

Figure 4 is a schematic axonometric view of two filter plates 13 of a plate group 12. The filter plates rotate in the direction indicated by the arrow when rotated by the shaft 11. Through the channel 26, a vacuum is applied to the suction surface 13 'of each plate 13. Each plate 13 is attached or rests on its own weight on the support base 25. The support base 25 is further attached to the vertical shaft 11 by its support rib 25 'or the like on its outer surface. The filter plates 13 may also be directly attached to the rotation shaft 11. The tubes 26 are passed 35 from each plate group 12 via the tubular shaft 11, preferably through its hollow interior to a manifold 23 and further to a non-shown vacuum and / or overpressure source or fluid purge source.

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Claims (5)

A suction dryer device (10) comprising a plurality of liquid filter liners (13) and means for applying a vacuum to each filter plate 5 to apply liquid suction to a material to be dried via a suction surface (13 ') of the filter plates, the suction dryer device comprising a vertical shaft (11) and attached thereto. a plurality of filter plates (13), each filter plate (13) being adapted to move from its surface (13 ') substantially horizontally, the material to be dried being adapted to adhere to the upper surface of each filter plate (13), resting against the filter surface (13') under gravity and vacuum; characterized in that the suction dryer device comprises a plurality of overlapping groups of plates (12a, 12b, 12c, 12d), each of which has a plurality of horizontal filter plates (13) with a surface (13 ') arranged on a circumferential sector and preferably right next to each other, and that the means to place the material to be dried on the suction surface (13 ') of the filter plate (13) ) comprise duct material drying channels (14a, 14b, L4c, I4d) directed to each tile group (12a, 12b, 12c, 12d) through which the material to be dried is brought from the basin (16) or the like. 20 1 Claims Suction dryer device according to claim 1, characterized in that the suction dryer device comprises a conveyor (21) below the filter cake removal station (B), into which the dried material is first dropped by means of the filter cake removers (20). 25 A suction dryer device according to claim 1 or 2, characterized in that the device comprises a conveying screw or the like in the filter cake removal station (B), which transfers the dried material to the outer circumference of the filter plate (13). 30 Suction dryer device according to one of the preceding claims, characterized in that the device comprises a brush device and / or an ultrasonic cleaning device and / or an infrasonic cleaning device in the washing surface (C) of the filter surface (13 '). 35 Suction dryer device according to one of the preceding claims, characterized in that the filter plates of the suction dryer device are ceramic filter plates. 8 79248