WO2010144926A1

WO2010144926A1 - Device for separating coarse solids

Info

Publication number: WO2010144926A1
Application number: PCT/AT2010/000174
Authority: WO
Inventors: Herbert Zegg; Bedo Coc; Harald Weigant
Original assignee: Celtec Gmbh
Priority date: 2009-06-18
Filing date: 2010-05-19
Publication date: 2010-12-23
Also published as: EP2442884A1; AT508024B1; AT508024A4

Abstract

The invention relates to a device for separating coarse solids from a viscous fluid, for example a fiber suspension, comprising means for separating coarse materials from the acceptable material and means for discharging and removing the coarse materials from the device, wherein in a separating chamber (5), into which the raw fluid flows and in which the coarse materials are separated from the acceptable material, at least one movable mechanical discharge unit (6) is arranged, which moves the coarse materials deposited or enriched there into at least one discharge region (70, 80). The invention is characterized in that said discharge region (70, 80) can be temporarily partitioned off the separating chamber (5) by the discharge unit (6), whereby at least one discharge chamber (7, 8) is formed, which is spatially delimited from the separating chamber (5) and from which the coarse materials are discharged from the device.

Description

Device for separating coarse solids

The invention relates to a device for separating coarse solids according to the preamble of claim 1.

Methods for separating coarse solids from viscous fluids are known and required in various applications. The viscous fluid to be treated may be, for example, a sludge obtained in wastewater engineering. Such a clarifying or fecal sludge is an aqueous suspension of more or less fine organic and mineral solids, but may also contain coarse solids such as sand, gravel or stones, which interfere with the treatment and cause high wear on the system components. Other coarse solids such as rags, sanitary napkins or condoms can cause blockages. On the other hand, a viscous fluid may also be industrially produced

Act liquids or around. biological suspensions. Especially in the paper industry, in pulp processing and especially in waste paper recycling, pulp suspensions are often treated in which unwanted coarse materials such as wires, paper clips, staples, etc. are included. These coarse matter or rejects interfere in many ways and must be removed from the pulp. Here, especially in the paper processing, the additional problem that the viscosity or toughness of such suspensions is considerably higher than that of water, whereby a separation is difficult.

Numerous devices for sorting pulp suspensions are known in the art, e.g. Sieve drums are used for separating coarse solids. In order to prevent the surface of these sieves from forming a pressure drop-increasing and performance-reducing filter cake of substances to be filtered on the one hand and coagulants to be separated on the other hand, it is known to arrange clearing elements, scrapers or scratches in this area in order to loosen the filter cake and if necessary remove. Furthermore, as is known, for example, in FR 2 584 948, devices are known in which internal screws scrape and remove the filter cake from the sieve.

Other ways of separating coarse materials use gravity or centrifugal forces to separate and remove the coarse particles. However, especially with highly viscous suspensions, such methods are unsuitable, since, for example, with the gravity sorters, a high loss of accepts takes place, as a result of which expensive re-sorting becomes necessary for the recovery of the accepts. It is too Especially in the paper industry often required to keep the density or consistency of the accept, because subsequent machines, eg grinding units, do not work optimally at higher dilution levels.

By centrifugal forces operating systems such as heavy duty cleaner etc., in turn, require due to the small weight differences of the rejects compared to the suspension high speeds and high energy to ever accomplish an efficient separation.

Another problem to be considered is that in such devices not only a fundamental separation in coarse and accepts is to be performed. In addition, the ones accumulating in the filter must also

Coarse materials are completely removed from the device, as these coarse materials could on the one hand reduce the throughput and could lead to blockages and the

Promote and accelerate the formation of a filter cake. A mere loosening of the filter cake, without removing the coarse matter, is in the long run too little, since from a certain concentration of coarse filter cake would regrow too quickly.

According to current practice, it is necessary to remove the coarse material from the system, turn off the system and remove the coarse by hand or by means of discontinuous flushing from the filter chamber. However, this inevitably requires a lifetime of the device, whereby the operation of the device is interrupted and the performance and the throughput is reduced.

It is therefore an object of the present invention to provide a device which overcomes the above mentioned drawbacks and which can efficiently treat highly viscous suspensions of high solids content and which easily remove the coarse particles.

This object is achieved in a device for separating coarse solids from a viscous fluid, such as a fiber suspension, with means for separating the coarse material from the accept and means for discharging and removing the coarse material from the device, wherein in a separation space in which the crude fluid flows and in which the separation of the coarse material takes place from the accepts, at least one movable mechanical discharge device is arranged, which shifts the there separated and enriched coarse materials in at least one discharge, by the characterizing features of claim 1.

According to the invention, it is provided that the discharge area is temporarily separable from the separation space by the discharge device, whereby at least one of the Separation space spatially delimited discharge space is formed, from which the coarse materials are discharged from the device.

With such a device, it is thus possible, on the one hand, to efficiently sort suspensions with very large proportions of solids and thereby to obtain a highly concentrated accept, without dilution being carried out.

In addition, it is possible with the device according to the invention to separate the coarse materials in a manner that very little carrier material or accepts is mitentfernt, whereby the quantitative absolute losses of accepts are minimal.

In addition, the device can be operated energy-saving, but at the same time efficient, since it is not dependent on gravity or centrifugal forces, but the coarse materials are forcibly removed with the .mechanical discharge device.

A significant advantage of the device according to the invention is also that the

Device for removing the coarse material does not have to be switched off, but that the device can be continuously operated while the coarse material from the system continuously removed at certain intervals. This will be

Lasts prevented and increased penetration performance. This is done by the

Main room or filter room temporarily delimited discharge guaranteed, in which the coarse materials are pushed through the mechanical device. By this temporary spatial and relatively dense demarcation or separation remains the actual

Filtration process in the main room untouched and the coarse materials can be removed without disturbing the actual separation process.

Further advantageous embodiments of the invention are described by the features of the dependent claims, but without limiting the scope of protection:

According to an advantageous development of the device according to the invention it is provided that a sieve is provided as a means for separating the coarse from the accept, wherein the accept passes through the screen and is discharged and the coarse particles remain in the separation space and are enriched there, preferably a device for Cleaning the screen openings or to keep the screen surfaces is provided. By means of such a sieve separating device, the coarse materials can be removed in a mechanically very simple and reliable manner. In addition, only a small amount of energy is required and it is also easy coarse material can be separated well. In this connection, it can be provided in a particularly advantageous embodiment that the means for separating the coarse material from the accepts is designed as a screen basket or sieve drum, and the Trerinraum and the discharge are designed as annular spaces, in particular the separation space cylinder jacket arranged around the sieve drum is. In such an embodiment, it is ensured that the viscous fluid can pass through a large screen surface on all sides and the device operates efficiently and has only a small footprint.

Mechanically very simple and less susceptible to errors, the discharge device then works when it is provided that the discharge in the separation chamber is linearly displaced back and forth.

A good effect and an effective removal of the coarse materials is ensured if the discharge device comprises an essentially perpendicular to its direction of rotation aligned annular disc, which acts on the coarse materials.

In this context, it is advantageous if it is provided that the annular disk has a slightly smaller radial width than the width of the separation space and / or the discharge space.

A good and reliable guidance of the annular disc is ensured when the annular disc is guided over two rods, which preferably attach at opposite positions on the annular disc. An advantageous embodiment, which provides that the rods are connected to each other via a bending and torsion-resistant connecting element or spaced from each other, wherein the connecting element is in particular bent or curved, preferably with a curvature as the edge of the annular disc, ensures a secure movement Ring disc, without wedging. Further advantageous embodiments of the invention provide that the

Discharge device is configured as in the separation space rotating screw, piston, scraper or screen plate. Depending on the nature and design of the coarse material to be separated, a selection can be made here.

The device works particularly effectively when the discharge space is separated from the separation space in a fluid-tight manner. In this way, the losses of accepts in the removal of the coarse materials are minimal and the separation of the coarse materials can be undisturbed and without any impairment.

An advantageous embodiment is characterized in that two discharge areas and two discharge spaces are provided which lie in the mutually opposite terminal areas of the separation space. In this way, a double effect can be achieved. In this context, it is advantageous if it is provided that everyone

Discharge space has means for removing the coarse matter enriched therein, in particular an outlet or a vent opening and optionally a

Flushing. A tedious manual removal of coarse materials is not required.

In an advantageous further development it can be provided that a control is provided which coordinates the movement of the discharge device and the means for removing the coarse materials, wherein the controller controls the opening of the outlets or the function of the flushing devices in each discharge space, for example, that the Outlets only then opened or the flushing devices are activated only when the discharge has reached its terminal extreme position or has separated the discharge from the separation space. In this way it is ensured that the separation of the coarse material is undisturbed and independent of the application of the coarse material from the discharge spaces. In this context, it is advantageous that the separation into accept and

Grobst can be continued continuously and the means for removing the coarse materials are discontinuously operable.

According to advantageous developments of the invention it can be provided that the device is designed as a gravity separator, centrifugal separator, cyclone separator or magnetic separator, wherein the mechanical discharge device is arranged and acts in that region in which the coarse matter is deposited and enriched. Depending on the type of suspensions to be treated and the coarse matter to be separated off, in each case a special separating device may be advantageous or provide the best results.

A particularly advantageous embodiment of the invention is illustrated by way of example and not limitation by means of the following drawings.

Fig. 1 shows a three-dimensional view of the device. FIGS. 2 and 3 also show three-dimensional views of details of FIG

Device with partial sectional views. 4 and 5 show sectional views of the device

In Fig. 1, the device according to the invention is shown in three-dimensional representation, with parts of the housing have been removed in order to better represent the inner workings. In the same way, Figs. 2 and 3 are also three-dimensional Representations, each with different parts, such as the strainer, have been omitted.

In addition, all figures show the different states of movement of the discharge device 6, which are marked with different reference numerals, 6a and 6a 'and 21 and 21', respectively. The respective states of motion are partly, but not always, drawn by dashed lines. Also partially the connecting element 21 or 21 'is not shown. It is uniform that a first extreme position by the reference numerals 6a and 21 and a second opposite extreme position by the reference numerals 6a 'and 21' is marked.

The exemplary apparatus shown here is an apparatus for the paper industry for separating coarse solids from a viscous fluid, namely a paper pulp suspension containing staples, paper clips or wires as coarse material. However, this purpose is by no means restrictive, since this device is also suitable for other applications.

The device comprises means for separating the coarse materials, namely a substantially cylindrical screen basket or a cylindrical screen drum 2 with in particular slot-shaped screen openings, which is arranged in the interior of a separation chamber 5. The separation chamber 5 surrounds the screen drum 2 on all sides cylinder jacket-shaped with a common longitudinal axis. The ringra umförmige separation space 5 is bounded laterally by the outlet-side flange 19 and on the opposite side by a fixed bearing plate 18. Inside the separation space 5 is limited by the screen drum 2, outwardly through the housing of the device. Via an inlet 1, the raw suspension to be treated flows into the separation space 5 substantially normal to the sieve surface of the sieve drum 2. The fiber suspension flows around in the annular space separating space 5 and the accept occurs through the screen drum 2 from all sides. The accept occurs inside the screen drum 2 and is withdrawn via the outlet 3, which is formed by a flange 19. On the outer surface of the screen drum 2, that is, on the surface facing the separation space 5, a more or less thick filter cake forms in operation depending on the fiber content. To loosen the filter cake, a comb rotor 4 with eg two combs is optionally provided, which are driven by a motor to rotate the screen basket 2 along the slots of the screen drum 2 and keep clean or clean or loosen or remove the filter cake. In addition to the filter cake, the coarse materials are enriched in the outer region of the screen drum 2, whereby the concentration of coarse material in this region of the separation chamber 5 increases continuously.

In the interior of this separation space 5, a mechanical discharge device 6 is arranged, which is linearly reciprocally movable in a straight path, wherein the path is parallel to the central center axis of the screen drum 2 and parallel to the edge of the separation space 5. The discharge device 6 is used for discharging and removing the coarse material from the device and is designed so that with it the coarse materials can be moved and moved and are conveyed away from the critical area immediately in front of the screen drum 2.

The discharge device 6 can be designed as a screw rotating in the separating space 5, as a piston, scraper or scratch. It is essential that it is designed so that it is at least formed by the separation space 5 temporarily spatially delimited discharge space 7, 8, in which the coarse materials are pushed by her. In the advantageous embodiment shown in the figures, the

Discharge device 6 an annular disc 6a, which is guided over two rods 20. The two rods 20 are parallel to the central longitudinal axis of the screen drum 2 and set at opposite positions of the annular disc 6a and thereby allow a smooth guidance. The discharge device 6 can be moved pneumatically, hydraulically or electrically. In particular, in the use of hydraulic or pneumatic cylinders, the two rods 20a in an area outside the device or outside of the separation space 5 in addition via a bending and torsion, curved, bow-shaped connecting element or connecting yoke 21 connected or spaced from each other. The connecting element 21 is bent or curved in the same way as the edge of the annular disc 6a. In this way, tilting of the annular disc 6a in the separation space 5 is avoided.

The annular disc 6a has a radial width which is only slightly smaller than the radial width of the separation space 5. In this way, the annular disc 6a detects in their reciprocating almost all coarse materials and pushes them along the outside of the screen drum 2 in front of him. The gap between the annular disc 6a and the wall of the separation chamber 5 is only about a maximum of 2 mm wide, so that the coarse materials are effectively separated.

In the embodiment according to FIG. 1, this works equally in both directions.

In each of the two opposite end regions of the separation space 5, a discharge region 70, 80 is defined, which in each case corresponds to those Marks area in which the discharge device 6, 6a, the coarse materials shipped. In each of these two discharge areas 70, 80, a discharge space 7, 8 spatially delimited from the separation space 5 is temporarily formed by the discharge device 6, more precisely by the surface of the annular disk 6a. This formation of the discharge chambers 7, 8 takes place temporarily and is dependent on the movement of the discharge device 6. Thus, the discharge chambers 7, 8 are formed in a constant change and canceled, which in the present embodiment at the same time always only one order space 7, 8 is formed can be.

In Fig. 4, both positions of the discharge device 6 are shown. At the beginning, the annular disk 6a is located in the right-hand region of the separation space 5. As a result, the annular space-like discharge space 7 is formed in the discharge area 70, specifically bounded on one side by the one surface of the annular disk 6a and by the opposite surface of the bearing disk 18. Moving now the annular disc 6a of this extreme position in the other opposite terminal end position (in Fig. 4 with 6a '), the discharge chamber 7 is dissolved and in the opposite discharge area 80 a likewise annular space discharge chamber 8 is formed by the other surface of the annular disc 6a ¹ and the inner surface of the flange 19 is limited. The formation of each discharge chamber 7, 8 is, as I said, limited in time and due to the reciprocating motion of the annular disc 6a and the discharge 6.

It is advantageous if the annular disc 6a or 6a 'delimits the discharge chambers 7, 8 not only spatially but also fluid-tight.

Each discharge chamber 7, 8 has means for removing the inserted therein

Coarse materials. Thus, a flushing device 12, 13, 14, 15 is provided in each case in the upper region, via which liquid can be introduced into the discharge chambers via valves and nozzles from the outside. Alternatively, a central multi-way valve can be provided, which simultaneously creates a pressure relief function between the two discharge chambers 7 and 8.

On the opposite side of the flushing device 12, 13, 14, 15 each have a vent opening or an outlet 16, 17 is provided, over which the coarse materials are removed and thus removed from the system and from the separation chamber 5.

In Fig. 5 is a rotated by 90 ° sectional view of FIG. 4, wherein the

Discharge device 6 is shown in its initial state and the annular disc 6a is located far left in its terminal extreme position. According to the invention may further be provided a control, not shown in the figures, which coordinates the movement of the discharge 6, 6a and the functionality of the means for removing the coarse material and in particular at the right time, the outlets 16, 17 opens or activates the flushing devices.

The controller also has a reversing function if solids get jammed between the discharge device 6, 6a and the walls of the discharge space 7, 8 or the separation space 5.

The operation of the device according to the invention is based on FIG. 4 in practice as follows:

Through the inlet 1 a contaminated with wires and metal parts fiber suspension is introduced with high viscosity or a high pulp content. The suspension enters the annular space separating space and distributed there in the entire circumference. The accept to be separated penetrates through the openings of the screen drum 2 and is withdrawn. In the separation chamber 5, the coarse materials remain and accumulate there continuously. The annular disc 6a is now moved linearly to the left and takes on their way through the separation space 5, the coarse material or pushes in front of him, in the terminal discharge 80. When the annular disc 6a 'has arrived in its other extreme position there, it forms there the discharge chamber 8, whereby the coarse materials are present in a both spatially and fluid-tight demarcated annular space which is separated from the separation space 5. Now the outlet 17 is opened by the control and the flushing device 13, 15 is activated, whereby the coarse material leaves the device via the outlet 17. The outlet 17 is then closed again and the annular disc 6a 'moves back through the separating space 5 back to the right, in turn pushes the coarse material accumulated in the meantime in front of him, now in the opposite direction, in the direction of the discharge 70. Once the annular disc 6a has returned to its original end position, the discharge space 7 between the bearing plate 18 and the annular disc 6a is formed in the discharge area 70, again delimited spatially and fluid-tight from the separation space 5. Now opens the outlet 16 and the flushing device 12, 14 is activated, which in turn the coarse materials are discharged from the outlet 16.

Thus, the process is repeated, whereby the discharge device 6, 6a is moved relatively slowly in the rule. The speed depends on the expected proportion of coarse material and can be adjusted continuously and readjusted. Meanwhile, the separation of the coarse material passes through the screen drum 2 without

Continuous and uninterrupted continuation and will continue through the

Displacement and removal of coarse matter in no way impaired or influenced. Thus, the concentration of coarse materials in the separation space 5 can be kept constantly low, without having to stop the device. The coarse materials can thus be removed with a minimum residual content of accept or carrier material, whereby further fiber recovery stages can be saved. In addition, there is no dilution of the medium, which results in more advantageous operation of downstream machines, e.g. Grinding devices enabled. In addition, only very little energy is required to remove the coarse materials.

In the figures, only an advantageous embodiment is shown. It is noted that the separation of the coarse materials does not necessarily have to take place via a sieve drum 2, but can also take place differently, for example the device can be designed as a gravity separator, centrifugal separator, cyclone separator or magnetic separator, depending on the type and properties of the coarse materials to be separated off. It is essential that the mechanical discharge device 6, 6a is arranged and operates in that region in which the coarse matter is deposited or enriched and that at least one spatially delimited discharge chamber 7, 8 is formed.

Claims

claims:

1. A device for separating coarse solids from a viscous fluid, such as a fiber suspension, with means for separating the coarse from the accept and agents for discharging and removing the coarse material from the device, wherein in a separation space (5), in which the crude fluid flows in and takes place in the separation of the coarse material from the accept, at least one movable mechanical discharge (6) for shifting the deposited there or enriched coarse material in at least one discharge area (70, 80) is arranged, characterized in that this discharge area (70, 80) is temporarily separable from the separation space (5) by the discharge device (6), whereby at least one discharge space (7, 8) spatially delimited by the separation space (5) is formed, from which the coarse materials can be expelled from the device.

2. Apparatus according to claim 1, characterized in that a sieve is provided as a means for separating the coarse from the accept, wherein the accept passes through the sieve in operation and can be discharged and the coarse material in the separation space (5) remain and be enriched there, wherein preferably a device for cleaning the screen openings or to keep clear the screen surfaces is provided.

3. Apparatus according to claim 1 or 2, characterized in that the means for separating the coarse material from the accepts as Siebkorb or sieve drum (2) is formed, and the separation space (5) and the discharge space (7, 8) are designed as annular spaces , wherein in particular the separation space (5) is arranged in the form of a cylinder jacket around the sieve drum (2).

4. Device according to one of claims 1 to 3, characterized in that the discharge device (6) in the separation space (5) linearly back and forth is displaceable.

5. Device according to one of claims 1 to 4, characterized in that the discharge device (6) comprises a substantially perpendicular to its direction of movement aligned annular disc (6a) for acting on the coarse materials.

6. Apparatus according to claim 5, characterized in that the annular disc (6a) has a slightly smaller radial width than the width of the separation space (5) and / or the discharge space (7, 8).

7. Apparatus according to claim 5 or 6, characterized in that the annular disc (6a) via two rods (20) is guided, which preferably begin at opposite positions on the annular disc (6a).

8. Apparatus according to claim 7, characterized in that the rods (20) via a bending and torsion-resistant connecting element (21) are interconnected or spaced from each other, wherein the connecting element (21) is in particular bent or curved, preferably with a Curvature like the edge of the annular disc (6a).

9. Device according to one of claims 1 to 8, characterized in that the discharge device (6) as in the separation space (5) rotating screw, piston, scraper or screen plate is configured.

10. Device according to one of claims 1 to 9, characterized in that the discharge chamber (7, 8) is temporarily fluid-tight manner separated from the separation space (5).

1 1. Device according to one of claims 1 to 10, characterized in that two discharge areas (70, 80) and two discharge chambers (7, 8) are provided which lie in the opposite end regions of the separation space (5).

12. Device according to one of claims 1 to 11, characterized in that each discharge chamber (7, 8) comprises means for removing the enriched therein coarse materials, in particular an outlet or a vent opening (16,17) and optionally a flushing device (12, 13,14,15).

13. Device according to one of claims 1 to 12, characterized in that a control for coordinating the movement of the discharge device (6,6a) and the means for removing the coarse material is provided, wherein the opening of the outlets (16,17) or the function of the flushing devices (12, 13, 14, 15) in each discharge space (7, 8) is controllable, for example, such that the outlets (16, 17) are only then opened or the flushing devices (12, 13, 14, 15) are activated only when the discharge device (6,6a) has reached its terminal extreme position or has separated the discharge chamber (7, 8) from the separation space (5).

14. Device according to one of claims 1 to 13, characterized in that the device is continuous and the means for removing the coarse materials are discontinuously operable.

15. Device according to one of claims 1 to 14, characterized in that the device is designed as a gravity separator, centrifugal separator, cyclone separator or magnetic separator, wherein the mechanical discharge device (6,6a) is disposed in the region and acts in which deposited the coarse material and enriched.