• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The subject of this invention is a hydrocyclone (1) with an inlet area (2) with a tangential inlet (4) for a feed pulp (6) and a further separation area (3) adjoining the inlet area (2) with an underflow discharge pipe (8) Removal of heavy materials and a headflow nozzle (9), which projects in the form of a dip tube axially into the interior of the hydrocyclone (1). In the region of the tangential inlet (4), a further inlet (5) for supplying a barrier fluid flow (7) is provided, wherein the barrier fluid (7) and the feed pulp (6) in the hydrocyclone (1) before their merger by a lamella (10). are separated from each other. According to the invention, the separation region (3) comprises a conical section (15) and an adjoining cylindrical section (18) above the underflow discharge pipe (8).
    公开号:AT516856A4
    申请号:T557/2015
    申请日:2015-08-21
    公开日:2016-09-15
    发明作者:Michael Dipl Ing Kramer
    申请人:Andritz Ag Maschf；
    IPC主号:
    专利说明:

    HYDROCYCLONE WITH FINE-FREEZED FLUORESCREEN Qi ilyl CYLUM RUNNING
    The subject of this invention is a hydrocyclone with an inlet region with a tangential inlet for a task pulp and another subsequent to the inlet region separation area with an underflow discharge pipe for removal of heavy materials and a head nozzle, which projects in the form of a dip tube axially into the interior of the hydrocyclone. In the region of the tangential inlet, a further inlet for supplying a barrier fluid flow is provided, wherein the barrier fluid and the feed sludge in the hydrocyclone are separated from each other before their merger by a lamella.
    A hydrocyclone usually consists of a cylindrical segment with a tangential inlet (inlet nozzle) and a subsequent conical segment with the underflow or Apexdüse. The vortex finder or the top jet nozzle protrudes in the form of a dip tube axially from above into the interior of the cyclone.
    The terms "top" and "bottom" in the present description are based on the upper run (specifically lighter and / or smaller grain fraction) and the lower run (specifically heavier and / or coarser fraction). However, the actual positioning of the hydrocyclone is largely independent of this, as well as horizontally installed hydrocyclones are often used.
    Hydrocyclones are separation units that are able to separate solid mixtures based on different sinking rates. It is to be assumed that no complete separation of the fractions, but large differences in the rate of descent are assigned with very different probabilities to get into the respective coarse or fine deduction.
    As a rule, the pulp is supplied tangentially to the cyclone head section, where it is forced onto a downward circular path and accelerated by the coaxial constriction of the cyclone lower part on the resulting downward spiral. This acceleration and the resulting centrifugal force result in a strong force field that drives out all of the heavier particulates than the surrounding fluid, while all the lighter particles move inward. Along the entire downward spiral a detachment of the near-core layers takes place in the upward direction
    Upper reaches flow. The thickened stream, referred to below, is called underflow, which flows upwards, called overflow or overflow.
    Naturally, the headwash flow contains significantly less solids than the outboard, downwardly directed flow fields. In addition, for particles with very low sinking rates, there is a much higher probability of reaching the upper-stream flow than is the case for coarse-grained fractions, so that there is a relative accumulation of fines (based on the solids mass) in the upper reaches. Volume related (in mg / 1), however, the case is exactly the opposite, based on the discharged volume flow, the upper reaches a solids depletion of fine fractions, if they are specifically heavier than the fluid.
    So there is one (often unwanted) in the lower reaches
    Concentration of fines, based on the withdrawn fluid volume.
    In order to prevent this, an initially mentioned washing water cyclone was developed, with the aim of creating a barrier water layer (sedimentation auxiliary layer) by means of a lamella, which makes it difficult for fines to sediment into the downwardly discharged area due to the reduced sedimentation velocity. This particular hydrocyclone is described in WO 2013/117342.
    However, in the case of this hydrocyclone, in particular in the region of the flow reversal in the cone outlet region, unstable states often result, which result in a strong movement of the trombe located in the core region and which can thus cause remixing of originally separate fractions. In addition, with spatial proximity of the upward-directed core flow (with fines) and the downward-directed, washed underflow flow, a faulty discharge of individual flow layers can take place, which likewise can increase the erroneous grain discharge.
    It has also been found that, especially at high temperatures of the feed pulp, an increased discharge of "core flow" into the underflow takes place.The problem is intensified by the metered addition of washing water, which can also lead to a significant dilution in the underflow.
    The invention is therefore an object of the invention to improve working with barrier fluid layer hydrocyclone so that it can be operated more easily in stable conditions, whereby the Fehlaustrag of fines or fine grain in the lower reaches is further reduced. The fines should therefore be depleted in the underflow, based on the volume-related concentration in the inlet.
    This object is achieved by a hydrocyclone according to claim 1. In the hydrocyclone according to the invention, the separation region consists of a conical section and an adjoining cylindrical section above the underflow discharge pipe.
    As a result, the distance of the flow reversal is increased to the underflow hood. The task of the cylindrical section is to move the sedimented coarse material to the outlet in a defined motion by means of a rotary motion, without giving the (transient) core flow a tendency to penetrate into the underflow nozzle or underflow discharge pipe.
    The cylindrical extension thus provides a sort of "solids buffer" which requires a soaked exhaust zone through the conventionally arranged discharge nozzle.
    In addition, this invention allows the use of a larger underflow nozzle, as in conventional hydrocyclones with comparable take-off ratios in lower and upper run. The possibility of using a larger underflow nozzle or a larger Unterunteraustragsrohrs also increases the reliability, because the risk of clogging of the underflow nozzle is significantly reduced.
    Good separation results are obtained when the diameter of the cylindrical portion is smaller than the height of the cylindrical portion.
    It is favorable if the diameter of the cylindrical section is at least 25 mm, preferably at least 30 mm.
    Preferably, the transition from the conical section to the cylindrical section is not more than 100 mm after the barrier fluid supply, that is arranged below the fin end.
    Preferably, the blade is substantially cylindrical or conical. It may extend in the inlet region or in the cylindrical segment from the inlet region of the barrier fluid flow to the transition to the conical separation region segment or be fastened in the conical region. This leaves enough time for a stable circular flow to form in both the barrier fluid layer and the feed pulp.
    It is expedient for the lamb to come to an acute point at the other end, or to be as thin as possible, so that the barrier fluid flow and the turbid fluid can be brought together as swirl-free as possible. The two flows should also continue to flow below the lamella separated as possible.
    In a favorable embodiment, the mouth opening of the upper-flow nozzle extends into the region in which the barrier fluid flow and the feed pulp are continued together.
    The lamella can also have equalization openings, which constitute a connection between the feed pulp and the barrier fluid flow, which results in pressure equalization between barrier fluid and suspension before the two layers meet. Ideally, the barrier fluid is always subjected to a slightly higher pressure than the suspension.
    In the following, the hydrocyclone according to the invention will be described with reference to two drawings. Show it:
    1 shows a schematic longitudinal section through an embodiment of the hydrocyclone according to the invention.
    2 shows a cross section in the region of the inlet through the hydrocyclone according to the invention;
    3 shows a schematic longitudinal section through a further embodiment of the hydrocyclone according to the invention;
    The same reference numerals in the figures designate the same components or streams.
    FIG. 1 shows the hydrocyclone 1 according to the invention.
    It consists of an inlet area 2 and an adjoining separation area 3. The inlet area 2 is here cylindrical. The separation region 3 consists of a conical section 15, which adjoins directly to the inlet region 2, and of a cylindrical section 18 adjoining a partial piece 18 adjacent to the cylindrical section 18. The diameter x of the cylindrical section 18 is here 30 mm and its height (length of the section 18 viewed in the axial direction) y is here 40 mm. To the cylindrical portion 18 closes after a cross-sectional constriction an underflow discharge pipe 8 for the removal of coarse material or coarse grain. This discharge pipe 8 can act as a holder for another nozzle, or even embody the discharge nozzle itself. Via the tangential inlet 4, a feed pulp 6 is fed to the hydrocyclone 1. The feed pulp 6 may be, for example, a gypsum suspension.
    Through the upper-stream nozzle 9, which protrudes axially in the form of a dip tube into the interior of the hydrocyclone 1, the specific lighter or finer-grained fraction can be discharged as the upper reaches 12.
    In addition to the tangential inlet 4, the hydrocyclone 1 also has a further inlet 5 (shown in FIG. 2) for the barrier fluid flow 7, which is likewise supplied tangentially to the inlet region 2 here. The barrier fluid 7 is, for example, water, alcohol or oil. The barrier fluid stream 7 and the feed pulp 6 are fed to the hydrocyclone 1 separately and separated in the hydrocyclone 1 by the blade 10 from each other. The lamella 10 is, for example, a cylindrical, thin-walled metal component. The pure barrier fluid flow 7 meets at the lower end 13 of the blade 10 with the actual suspension flow (Aufgabetrübe 6) together. This takes place as soon as the flows from the barrier fluid 7 and the feed pulp 6 are stably formed. The distance z from the lower end of the blade 10 to the transition from the conical portion 15 to the cylindrical portion 18 is less than 100 mm here.
    After the merging of the streams 6, 7, a sedimentation movement of heavy particles through the barrier layer 7 occurs. This leads to a depletion of the fines in the lower run 11. In the conical separation region 3, the flow is carried out as in conventional hydrocyclones.
    The lamella 10 here has equalization openings 17, which constitute a connection between the feed pulp 6 and the barrier fluid flow 7, which results in a pressure equalization between the barrier fluid 7 and the suspension 6. These compensation holes are also conceivable in the region of the inlet 5.
    The flow arrows indicate that the barrier fluid flow 7 and the feed pulp 6 mix with one another as little as possible. The blocking fluid flow 7 thus forms a barrier fluid layer 7 towards the wall of the conical section 15.
    In the cylindrical portion 18 of the deposited coarse has enough space to move by means of rotary movement targeted direction Unterlaufaustragsrohr 8. In addition, this extension prevents the core flow breaks through into the actual underflow (11).
    The mouth opening 14 of the upper nozzle 9 ends here in the region below the end 13 of the blade 10th
    Depending on the respective volume fractions in the barrier fluid flow 7 and the feed pulp 6, the separation of the heavy fraction (coarse particles) will be more or less sharp.
    FIG. 2 shows a cross-section through a hydrocyclone 1 according to the invention in the region of the inlet. In this case, the tangential inlet 4 for the feed pulp 6 and the tangential inlet 5 for the barrier fluid layer 7 can be easily recognized. These two inlets 4, 5 open substantially in parallel the inlet area 2.
    FIG. 3 shows a further embodiment of the hydrocyclone 1 according to the invention. The diameter D1 of the inlet region is 75 mm here and the inner diameter D2 of the upper nozzle is 25 mm. This hydrocyclone 1 has a cone-shaped lamella 10, which extends into the cone-shaped portion 15 of the separation region 3. The further inlet 5 for the supply of the barrier fluid 7 is located between the conical lamella 10 and the conical section 15 of the separation region 3. The adjacent to the conical section 15 cylindrical portion 18 here has a height y of 150 mm and a diameter x of 37 mm up. Below the cylindrical portion 18, the underflow discharge pipe 8 having an initial diameter d2 of 25 mm and a final diameter of 10 mm is disposed. The jump of the diameter in the underflow nozzle comes here by conditions, because here a nozzle 19 is inserted for the discharge of the lower run 11 in the Unterlaufaustragsrohr 8. Of course, the underflow nozzle may also have a uniform diameter of, for example, 10 mm. The dimensions given here refer to a hydrocyclone which has achieved very good results in the experimental plant, it is of course possible that deviating dimensions also achieve very good results.
    权利要求:
    Claims (10)
    [1]
    claims
    1. hydrocyclone (1) with an inlet region (2) with a tangential inlet (4) for a feed pulp (6) and another to the inlet region (2) subsequent deposition zone (3) with an underflow discharge pipe (8) for the removal of heavy materials or Coarse grain, with an upper jet nozzle (9) in the form of a dip tube projecting axially into the interior of the hydrocyclone (1), and at least one further inlet (5) for supplying a barrier fluid flow (7) in the area of the tangential inlet (4), the barrier fluid (7) and the feed pulp (6) being able to be combined in the hydrocyclone (1) and being separated from one another by a lamella (10) before being brought together, characterized in that the separation region (3) consists of a conical section (15 ) and from an adjoining cylindrical portion (18) above the underflow discharge pipe (8).
    [2]
    2. Hydrocyclone (1) according to claim 1, characterized in that the diameter (x) of the cylindrical portion (18) is smaller than the height (y) of the cylindrical portion (18).
    [3]
    3. hydrocyclone (1) according to claim 1 or 2, characterized in that the transition from the conical portion (15) to the cylindrical portion (18) is arranged a maximum of 100 mm after the barrier fluid supply.
    [4]
    4. hydrocyclone (1) according to one of claims 1 to 3, characterized in that the diameter (x) of the cylindrical portion (18) at least 25 mm, preferably at least 30 mm.
    [5]
    5. hydrocyclone (1) according to one of claims 1 to 4, characterized in that the lamella (10) is substantially cylindrical.
    [6]
    6. hydrocyclone (1) according to one of claims 1 to 4, characterized in that the lamella (10) is substantially conical.
    [7]
    7. hydrocyclone (1) according to one of claims 1 to 6, characterized in that the lamella (10) in the inlet region (2) to the transition to the deposition area (3).
    [8]
    8. hydrocyclone (1) according to one of claims 1 to 6, characterized in that the lamella (10) extends into the deposition area (3).
    [9]
    9. hydrocyclone (1) according to one of claims 1 to 8, characterized in that the mouth opening (14) of the headwash nozzle (9) extends into the region in which the barrier fluid flow (7) and the Aufgabetrübe (6) continued together become.
    [10]
    10. hydrocyclone (1) according to one of claims 1 to 9, characterized in that the lamella (10) converges at its lower end (13) pointed, so that the barrier fluid flow (7) and the Aufgabetrübe (6) are possible vortex-free merge.
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    同族专利:
    公开号 | 公开日
    PL3132856T3|2022-01-24|
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    EP3132856A1|2017-02-22|
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    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA557/2015A|AT516856B1|2015-08-21|2015-08-21|Hydrocyclone with fines removal in the cyclone underflow|ATA557/2015A| AT516856B1|2015-08-21|2015-08-21|Hydrocyclone with fines removal in the cyclone underflow|
    PL16180341T| PL3132856T3|2015-08-21|2016-07-20|Hydrocyclone with fine material reduction in the cyclone underflow|
    EP16180341.6A| EP3132856B1|2015-08-21|2016-07-20|Hydrocyclone with fine material reduction in the cyclone underflow|
    US15/230,583| US9884325B2|2015-08-21|2016-08-08|Hydrocyclone with fine material depletion in the cyclone underflow|
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