Hydrocyclone equipment

Abstract

The present invention relates to an apparatus for cleaning a fiber suspension, the apparatus having a plurality of hydrocyclones (1) arranged side by side in a row, each hydrocyclone having at least one inlet connector (2), at least one qualified material connector (3) and at least one waste material connector (4), the apparatus having at least one supply manifold (5) and / or at least one qualified material manifold (6) and / or at least one waste material manifold (7), the supply manifold being connected to the plurality of inlet connectors (2) to supply the fiber suspension, the qualified material manifold being connected to the plurality of qualified material connectors (3) to discharge qualified material, and the waste material manifold being connected to the plurality of waste material connectors (4) to discharge waste material, wherein the manifolds (5, 6, 7) are designed to be elongated and the corresponding connectors (2, 3, 4) are connected to the corresponding manifolds (5, 6, 7) on their longitudinal sides. Deposition in the manifolds (5, 6, 7) should be suppressed by means that at least one end of the manifold (5, 6, 7) after the last hydrocyclone (1) is introduced into or out of the manifold (5, 6, 7) through a flushing joint (8).

Description

Technical Field

[0001] This invention relates to an apparatus for cleaning fiber suspensions, the apparatus having a plurality of hydrocyclones arranged side by side, each hydrocyclone having at least one inlet connector, at least one qualified material connector and at least one waste material connector, the apparatus having at least one supply manifold and / or at least one qualified material manifold and / or at least one waste material manifold, the supply manifold being connected to the plurality of inlet connectors to supply fiber suspensions, the qualified material manifold being connected to the plurality of qualified material connectors to discharge qualified material, and the waste material manifold being connected to the plurality of waste material connectors to discharge waste material, wherein the manifolds are designed to be elongated and the corresponding connectors are connected to the corresponding manifolds on their longitudinal sides. Background Technology

[0002] Hydrocyclones are ideal for using centrifugal force to concentrate the heavier and lighter components of fiber suspensions and discharge them through a discharge port or separator.

[0003] They are typically used to remove small metallic components, glass fragments, and sand, or polystyrene and other lightweight plastic components.

[0004] Hydrocyclone equipment is also commonly used to remove at least a large portion of the gases, such as air, contained in a liquid. For this purpose, the qualified material is placed under negative pressure after leaving the hydrocyclone so that the gases can escape and be discharged separately.

[0005] These processes are known in themselves, and it is also known that good results are only guaranteed when the hydrocyclone does not exceed a certain size.

[0006] In hydrocyclone equipment designed for large throughput, multiple, often a large number, hydrocyclones are required. They are then passed through in parallel by the liquid to be cleaned, which means the liquid flow must be split into a large number of smaller sub-flows.

[0007] Here, the fiber suspension is fed into the supply manifold, while the qualified and waste streams from the hydrocyclone converge in the qualified and waste manifolds. These tubular manifolds are typically closed on one side, which usually results in dead zones and thus causes deposition in the closed end region of the manifold. Summary of the Invention

[0008] Therefore, the technical problem to be solved by the present invention is to suppress deposition in the manifold.

[0009] According to the present invention, the above-mentioned technical problem is solved in such a way that, at the end of at least one manifold after the last hydrocyclone, fluid or suspension is introduced into or guided out of the manifold at least through a flushing joint.

[0010] The input or output of the medium causes additional flow.

[0011] This effectively suppresses the formation of dead zones and, consequently, the deposition of impurities.

[0012] Therefore, flushing joints are advantageously located at the end of the manifold in the direction of the main flow or in the opposite direction of the main flow.

[0013] If the present invention is implemented in the supply of a hydrocyclone, it means that there is a supply manifold and the fiber suspension is discharged through a flushing joint arranged at the end of the supply manifold along the main flow direction of the supply manifold. In order to control this on the one hand and to keep the loss as small as possible on the other hand, it is advantageous that the fiber suspension is preferably guided back from the flushing joint of the supply manifold into this or another supply manifold through a controllable valve and pump.

[0014] However, the present invention can also be used in cases where qualified material is discharged, i.e., there is a qualified material collection pipe and the fluid or suspension is input through a flushing joint arranged at the end of the qualified material collection pipe opposite to the mainstream direction of the qualified material collection pipe.

[0015] Alternatively or supplementarily, in order to influence the intensity and / or duration of flushing, it is also advantageous that the qualified material is preferably guided from the flushing joint located at the end of the qualified material manifold opposite to the mainstream direction of the qualified material manifold to the supply manifold via a controllable valve and pump.

[0016] Because the increased risk of sedimentation and blockage during waste discharge must be considered, fluids or suspensions should be introduced through a flushing joint located at the end of the waste manifold opposite to the main flow direction of the waste manifold.

[0017] To improve the efficiency of the equipment, it is advantageous to connect the flushing connector of the supply manifold to the inlet connector of an additional hydrocyclone. This, in turn, allows the qualified material connector of the additional hydrocyclone to connect to the qualified material manifold and / or the waste material connector of the additional hydrocyclone to the waste material manifold. This additional hydrocyclone ensures additional flow in the hazardous area of ​​the manifold and simultaneously increases the throughput of the equipment.

[0018] To achieve a simple design, at least one, preferably all, manifolds are designed as cylindrical pipes, with a closed end after the final hydrocyclone and a flushing joint thereon.

[0019] For optimized flow design, at least some, preferably all, of the joints of the hydrocyclone have a nozzle extending into the corresponding manifold, which preferably terminates in the manifold at a downward angle or bend in its main directional component from the corresponding joint.

[0020] Advantageously, the opening of the connector is perpendicular to the ground, or slightly inclined to the direction of the main flow of the corresponding manifold, or opposite to the direction of the main flow of the corresponding manifold, facing downwards.

[0021] In the case of supply manifolds, the suspension is suppressed from deposition in the lower region of the supply manifolds by suction through these manifolds.

[0022] In the case of qualified material collection pipes, the qualified material flowing in through these pipes causes turbulence and acceleration when the opening of the pipes is slightly pointed in the direction of the mainstream, thus avoiding or at least reducing deposition overall.

[0023] For the sake of a simple structure, it is advantageous to group hydrocyclones in such a way that the input connectors of a group of hydrocyclones are supplied by the same supply manifold and the qualified material connectors of the group of hydrocyclones are connected to a common qualified material manifold and / or the waste material connectors of the group of hydrocyclones are connected to a common waste material manifold.

[0024] However, to suit specific requirements, it is also advantageous to group hydrocyclones in such a way that the input connectors of a group of hydrocyclones are supplied by the same supply pipe and at least some of the qualified material connectors of the group of hydrocyclones are connected to different qualified material collection pipes. Attached Figure Description

[0025] The present invention will be further illustrated below with two embodiments.

[0026] In the attached image:

[0027] Figure 1 A side view of the hydrocyclone device is shown.

[0028] Figure 2 The cross-section of the supply manifold and qualified material manifold through the equipment is shown;

[0029] Figure 3 A schematic diagram of the device without the additional hydrocyclone 9 is shown. Detailed Implementation

[0030] The hydrocyclone 1 described herein is used to clean fiber suspensions, such as those required for papermaking, which have a consistency with a heavy component between 1.5% and 3.5%.

[0031] The fixed shell of the hydrocyclone 1 forms an elongated chamber with a circular cross-section. An inlet connector 2 is located at one end of the chamber, through which the fiber suspension to be cleaned is tangentially injected into the cylindrical inlet section of the chamber. The fiber suspension is thus drawn into a circular trajectory, where it is pressed against the walls of the chamber.

[0032] Due to the centrifugal force and the force of leaving the center, the heavy component accumulates on the walls of the chamber and the light component accumulates in the center of the chamber.

[0033] The heavy component thus spirals along the flow direction on the wall of the chamber to the opposite end of the chamber with waste connector 4, through which the heavy component is discharged from the hydrocyclone 1.

[0034] To prevent clogging of the waste connector 4, a diluent can be introduced into the chamber through the dilution inlet pipe 13 in the area of ​​the waste connector 4. This allows the hydrocyclone 1 to be used trouble-free even at high concentrations.

[0035] The fiber suspension, which has been stripped of heavy components and is located in the center of the chamber, is pumped out as qualified material through qualified material connector 3. For this purpose, the tubular qualified material connector 3 extends along the central axis from the inlet end to the center of the chamber of the hydrocyclone 1.

[0036] Following the cylindrical inflow section of the chamber, a conical hydrocyclone section is connected at the opposite end along the flow direction, i.e., towards the waste connector 4. In this conical hydrocyclone section, the diameter of the chamber continuously decreases towards the waste connector 4. Due to this gradual taper, the rotational speed of the suspension increases, causing the heavy components to concentrate on the walls of the chamber.

[0037] In contrast, if the light components are to be removed from the fiber suspension, the fiber suspension from which the light components have been removed is output as the heavy component-component through the waste connector 4 from the hydrocyclone 1, while the light components are discharged through the qualified material connector 3.

[0038] Typically, the hydrocyclones 1 used in this type of equipment are identical to each other. An important aspect is that the hydrocyclones 1 are grouped together. According to... Figure 1 The inlet connector 2, qualified material connector 3, and waste material connector 4 of a set of hydrocyclones 1 are connected to the same inlet manifold 5, the same qualified material manifold 6, or the same waste material manifold 7. However, when needed, the qualified material from a set of hydrocyclones 1 can also be distributed to different qualified material manifolds 6.

[0039] The qualified material can be placed under negative pressure in the qualified material manifold 6 or the downstream tank in a manner known per se via a vacuum device, causing the suspension therein to boil. This is known to be an effective means of removing gases, especially air, contained therein.

[0040] By using a so-called multi-cyclone device with multiple hydrocyclones 1 arranged side by side, the volume fluctuations caused by the shutdown of the hydrocyclones can be evenly distributed. That is, it is desirable that even in these cases, the volume throughput changes as little as possible through a single open hydrocyclone 1 in order to obtain optimal results.

[0041] Of course, the hydrocyclone 1 of the equipment can also be connected in multiple stages, with the waste material from the first stage being introduced into the second stage as input. This reduces fiber loss while achieving better cleaning results.

[0042] Figure 1 and Figure 2 An exemplary arrangement is shown of a set of vertical hydrocyclones 1, consisting of two parallel rows, each with multiple hydrocyclones 1 arranged side by side. Here, a supply manifold 5 for inputting fiber suspension, connected to the input connector 2 of these hydrocyclones 1, a qualified material manifold 6 for discharging qualified material, connected to the qualified material connector 3 of these hydrocyclones 1, and a waste material manifold 7 for discharging waste, connected to the waste material connector 4 of these hydrocyclones 1, extend horizontally between the two rows of hydrocyclones 1.

[0043] Here, all manifolds 5, 6, and 7 are designed as cylindrical, horizontally extending pipes, with one end closed, and the corresponding connectors 2, 3, and 4 are connected to the corresponding manifolds 5, 6, and 7 on the longitudinal side.

[0044] like Figure 2 As shown, the inlet connector 2 and the qualified material connector 3 of these hydrocyclones 1 each include a connecting pipe 12 extending into the corresponding manifolds 5 and 6, which terminates within the manifolds 5 and 6 in a downward bend, either vertically or slightly inclined to the vertical line from the corresponding connectors 2 and 3. This improves the flow conditions within the corresponding manifolds 5 and 6.

[0045] In addition, according to Figure 1 All manifolds 5, 6, and 7 of the hydrocyclone 1 have flushing joints 8 at their closed ends after the last hydrocyclone 1. To generate turbulence, fluid or suspension can be introduced into or out of the respective manifolds 5, 6, and 7 through these flushing joints 8.

[0046] Correspondingly, the flushing connector 8 is located at the end of the corresponding manifold along the main flow direction when the supply manifold 5 is in use, and at the end opposite to the main flow direction when the qualified material manifold 6 and the waste material manifold 7 are in use.

[0047] This allows a small portion of the fiber suspension to be cleaned to be discharged through the flushing connector 8, provided that the supply manifold 5 is in place. Figure 3 As shown, these fiber suspensions can be returned from the flushing joint 8 of the supply manifold 5 to this or another supply manifold 5 via pump 10.

[0048] To minimize the dead zone, fluid, such as dilution water or suspension, can also be introduced into the qualified material manifold 6 via a corresponding flushing connector 8. Alternatively, as... Figure 3As shown, a portion of the qualified material can also be guided from the flushing joint 8 of the qualified material collection pipe 6 back to the supply collection pipe 5 through the controllable valve 11 and pump 10.

[0049] Not shown, fluid or suspension is fed into waste manifold 7 through flushing joint 8.

[0050] In contrast, Figure 1 A solution is shown in which additional hydrocyclones 9 are arranged at the closed ends of manifolds 5, 6, and 7, which have flushing connectors 8. Here, the flushing connector 8 of the supply manifold 5 is connected to the input connector 2, the flushing connector 8 of the qualified material manifold 6 is connected to the qualified material connector 3, and the flushing connector 8 of the waste material manifold 7 is connected to the material connector 4 of the additional hydrocyclone 9. The additional hydrocyclone 9 generates flow at the closed ends of the manifolds, which inhibits the deposition of impurities. Furthermore, the additional hydrocyclone 9 increases the cleaning capability of the equipment.

Claims

1. An apparatus for cleaning a fiber suspension, the apparatus having a plurality of hydrocyclones (1) arranged side by side in a row, each hydrocyclone having at least one inlet connector (2), at least one qualified material connector (3) and at least one waste material connector (4), the apparatus having at least one supply manifold (5) and / or at least one qualified material manifold (6) and / or at least one waste material manifold (7), the supply manifold being connected to the plurality of inlet connectors (2) to receive the fiber suspension, the qualified material manifold being connected to the plurality of qualified material connectors (3) to discharge qualified material, and the waste material manifold being connected to the plurality of waste material connectors (4) to discharge waste material, wherein, The manifolds (5, 6, 7) are designed as elongated strips and corresponding connectors (2, 3, 4) are inserted into the corresponding manifolds (5, 6, 7) on their longitudinal sides. The manifolds are characterized in that, at the end of at least one manifold (5, 6, 7) after the last hydrocyclone, fluid or suspension is introduced into or guided out of the manifold (5, 6, 7) at least through a flushing connector (8), wherein one of the manifolds (5, 6, 7) is a supply manifold (5) and the fiber suspension is discharged through a flushing connector (8) arranged at the end of the supply manifold (5) along the main flow direction of the supply manifold (5), wherein the flushing connector (8) of the supply manifold (5) is connected to the input connector (2) of an additional hydrocyclone (9).

2. The device according to claim 1, Its features are, The flushing connector (8) is arranged at the end of the manifold (5, 6, 7) along the main flow direction, or at the end of the manifold (5, 6, 7) opposite to the main flow direction.

3. The device according to claim 2, Its features are, The fiber suspension is guided back from the flushing joint (8) of the supply manifold (5) through a controllable valve and pump (10) into this or another supply manifold (5).

4. The device according to claim 2 or 3, Its features are, There is a qualified material manifold (6) and the fluid or suspension is input through a flushing joint (8) located at the end of the qualified material manifold (6) opposite to the mainstream direction of the qualified material manifold (6).

5. The device according to claim 2 or 3, Its features are, The qualified material is guided from the flushing joint (8) of the qualified material manifold (6) into the supply manifold (5) through a controllable valve (11) and a pump (10).

6. The device according to claim 2 or 3, Its features are, There is a waste collection pipe (7) and fluid or suspension is input through a flushing joint (8) located at the end of the waste collection pipe (7) opposite to the main flow direction of the waste collection pipe (7).

7. The device according to claim 1, Its features are, The qualified material connector (3) of the additional hydrocyclone (9) is connected to the qualified material collection pipe (6).

8. The device according to claim 1, Its features are, The waste connector (4) of the additional hydrocyclone (9) is connected to the waste collection pipe (7).

9. The device according to any one of claims 1 to 3, Its features are, At least one cylindrical tube is designed to be closed at the end after the final hydrocyclone (1) and has a flushing joint (8) thereon.

10. The device according to any one of claims 1 to 3, Its features are, The hydrocyclone (1) has multiple joints (2, 3, 4) with connecting pipes (12) extending into the corresponding manifolds (5, 6, 7).

11. The device according to claim 10, Its features are, The connecting pipe terminates substantially downward or in a curved manner within the manifold (5, 6, 7) from the corresponding connector (2, 3, 4).

12. The device according to any one of claims 1 to 3, Its features are, The hydrocyclones (1) are grouped such that the input connectors (2) of a group of hydrocyclones (1) are supplied by the same supply manifold (5) and the qualified material connectors (3) of the group of hydrocyclones (1) are connected to a common qualified material manifold (6) and / or the waste material connectors (4) of the group of hydrocyclones (1) are connected to a common waste material manifold (7).

13. The device according to any one of claims 1 to 3, Its features are, The hydrocyclones (1) are grouped such that the input connectors (2) of a group of hydrocyclones (1) are supplied by the same supply pipe (5) and at least a portion of the qualified material connectors (3) of the group of hydrocyclones (1) are connected to different qualified material collection pipes (6).

14. The device according to any one of claims 1 to 3, Its features are, All manifolds (5, 6, 7) are designed as horizontally extending pipes, which are closed at the end after the last hydrocyclone (1) and have a flushing joint (8) thereon.

15. The device according to any one of claims 1 to 3, Its features are, All the joints (2, 3, 4) of the hydrocyclone (1) have connecting pipes (12) that extend into the corresponding manifolds (5, 6, 7).

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