• 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 matter of this invention is a hydrocyclone (1) having an inlet region (2) with a tangential inlet (4) for a feed pulp (6) and a separation zone (3) adjoining the inlet zone (2) with an underflow nozzle (8) for removal of coarse matter or coarse grain, wherein an upper-stream nozzle (9) in the form of a dip tube projects axially into the interior of the hydrocyclone (1). According to the invention, at least one further inlet (5) for supplying a barrier fluid stream (7) is provided in the region of the destangential inlet (4), this barrier fluid stream (7) and the feed pulp (6) being separated by a lamella (10) at least in the upper region of the hydrocyclone (FIG. 1) are separated from each other. The subject of this invention is also a method for operating the hydrocyclone (1) according to the invention.
    公开号:AT511837A4
    申请号:T177/2012
    申请日:2012-02-10
    公开日:2013-03-15
    发明作者:Michael Dipl Ing Kramer
    申请人:Andritz Energy & Environment Gmbh；
    IPC主号:
    专利说明:

    Hydro cyclone with fines enrichment in the cyclone underflow
    The subject of this invention is a hydrocyclone with an inlet region having a tangential inlet for the 5 feed sludges, and a subsequent to the inlet region separation area with an underflow nozzle for the removal of heavy materials, coarse or coarse grain.
    The subject of this invention is also a method for operating the hydrocyclone according to the invention. 10
    Hydrocyclones are centrifugal separators for suspensions or mixtures. With them mostly solid particles are separated or classified. Likewise, emulsions, such as. As oil-water mixtures are separated. 15 The hydrocyclone is an important part of the
    Gypsum drainage in a wet flue gas cleaning plant. The suspension withdrawn from the absorber is partially dewatered by one or more hydrocyclones and then reaches a belt filter or a centrifuge. 20 Using this method, the gypsum is usually brought to below 10% residual moisture and can then be removed.
    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. 30 The terms "top " and "below" In the present description, the upper run (specifically lighter and / or less granular fraction) and the lower run (specifically heavier and / or coarser fraction). However, the actual positioning of the hydrocyclone is as far as possible
    • ··· 2
    7242-AT • · ♦ ♦ •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
    Due to the tangential inlet into the cylindrical segment, the liquid is forced onto a circular path and flows downwards in a downwardly directed vortex. By tapering in the conical segment, there is an acceleration and displacement of volume inward and accumulation in the lower part of the cone. This results in the formation of an inner, upwardly directed vortex, which is discharged through the headflow nozzle. The aim is to separate the specific heavier fraction (eg solid, coarse, coarse grain) on the wall of the cyclone and thus the discharge through the underflow nozzle, while the specific lighter or finer-grained fraction escapes through the head nozzle. The below discharged, thickened stream is called underflow, the upwardly discharged, with mostly significantly reduced solids content, is referred to as overflow or overflow. 20 The basic principle of the separation and classifying effect is described by the interaction of centrifugal and flow forces. While the centrifugal force acts more strongly on large, specifically heavy particles (coarse particles) and thus they are deposited outward to the cyclone wall, the force of the flow on the particles (resistance force) is superior to small particles of light particles due to their higher specific surface area Importance.
    In hydrocyclones, the uniform dispersion of 30 fines in the feed ensures a division of these
    Grain size classes according to the distribution of the volume flow between upper and lower reaches. This means that normally fines are eliminated in the proportion with the coarse material, as corresponds to the volume split underflow / inlet (volume flow ratio). 35 • ·
    7242-AT
    Conventional hydrocyclones therefore generally fail to deplete a disperse phase whose density is similar to that of the fluid or whose particle size is small (~ <5 μm) from the underflow. 5 Recent developments, as described, for example, in DE102009057079A, go one step further by trying to separate fines from the underflow by inducing a wash flow from a clean fluid. The wash water stream is introduced tangentially in the cone or in the lower part of the cyclone in the rule. This dilution leads to a reduction in the concentration of fines in the pulp discharge, ie in the underflow. A disadvantage is that by the introduced liquid and the associated turbulence already separated heavy parts are flushed back into the core flow. This reduces the purity of the upper reaches. Through these disadvantages, the depletion of fines in the lower reaches can be implemented only to a limited extent, usually only to the extent that it corresponds to the additional 20 introduced water flow.
    EP 1 069 234 Bl discloses the addition of
    Dilution liquid directly into the core flow through a centrally located in the Apexdüse inlet pipe. The invention is therefore based on the object to provide a hydrocyclone, which improves the separation so that both the erroneous discharge of fines or fine grain in the lower reaches and the coarse or coarse grain is reduced in the upper reaches. The fines should therefore be depleted -30 in relation to the volume-related concentration in the inlet - in the lower reaches.
    This object is achieved by a hydrocyclone, in which by the introduction of a barrier layer of water or other fluid, a pure phase is provided, through which the coarse matter must sediment, whereas the
    7242-AT
    Fine fraction remains predominantly in the original stream. The supply of this barrier fluid is effected by at least one further feed independent of the suspension feed.
    The barrier fluid flow is separated from the suspension or feed pulp 5 by a lamella and can be introduced in the cylindrical segment. The lamella takes on the task of preventing mixing in the inlet area and to provide contact of the flow layers only after formation of a stable profile. 10
    It is also conceivable to supply a barrier layer in the cone region, wherein in this case a stepped expansion of the cyclone diameter may be provided in order to be able to introduce the barrier water flow without displacing the suspension.
    The basic idea of the invention is to obtain as defined sedimentation conditions by the formation of a sedimentation auxiliary layer (blocking fluid flow), which is in no or only slight interaction with the main flow 20, in order to achieve a real particle separation via its sedimentation path and no enrichment, such as otherwise usual. 25 The fines (fines) remain predominantly in the core flow. The barrier fluid flow surrounds the feed sludge in an annular manner. The fines or the fine particles are thus depleted in the underflow or ideally completely separated, based on the volume-related concentration in the inlet 30 (also taking into account the metered amount of barrier fluid or amount of sealing water).
    Preferably, the barrier fluid stream via the at least one further inlet tangentially fed to the inlet area.
    As a result, a stable circular barrier fluid flow 35 can form inside the cyclone. 7242-ΑΤ | · * · ## »« «Β · · · · ·· *
    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 sealing fluid flow 5 to the transition to the separation region or conical segment or be attached 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. 10
    It is favorable if the lamella converges at its lower end to be pointed or is made as thin as possible, so that the barrier fluid flow and the turbid turbulence can be brought together as swirl-free as possible. The two flows should also continue to flow 15 below the lamella separated as possible.
    In a favorable embodiment, the mouth opening of the upper jet nozzle extends into the region in which the barrier fluid flow and the feed pulp are continued together.
    The lamella may also have equalization ports, which provide a connection between the feed pulp and the barrier fluid flow, thereby resulting in a
    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. 30
    It is also conceivable that additional wash or dilution water can be introduced in the underflow area, so that a further depletion of Feistoffen or fine grain in the lower reaches can be achieved. For example, in the region 35 of the apex, a stream of water can be supplied axially to the vortex, in order to "...
    7242-AT to minimize re-agitation or mixing of the separated layers.
    The invention also provides a method for operating the hydrocyclone according to the invention, wherein the
    Sperrfluidstrom and the Aufgabetrübe in the hydrocyclone be continued together as soon as the barrier fluid flows and Auflaßetrübeströmung have formed stable. Preferably, washing or dilution water is injected in the region of the central flow nozzle, for example via a feed pipe arranged centrally in the underflow nozzle.
    In the following, the hydrocyclone according to the invention will be described with reference to four 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 and 4 a schematic longitudinal section through further embodiments of the hydrocyclone according to the invention; The same reference numbers in the two drawings indicate the same components. 25
    The following is an example of a hydrocyclone with cylindrical inlet area and conical deposition area. However, the principle according to the invention is also applicable to purely cylindrical or purely conical centrifuges or cyclones 30.
    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 »· *« «·
    7242-AT. Here, cylindrical and the separation region 3 is conical. 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.
    The separation region 3 has an underflow nozzle 8 for the removal of coarse matter or coarse grain. 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 10 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 only 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 by the blade 10 from each other. The lamella 10 is, for example, a cylindrical, thin-walled component 20 made of metal. 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. 25
    After the merging of the two volume flows 6, 7, a sedimentation movement of heavy parts (coarse materials) through the barrier layer 7 is established. This leads to a depletion of the fines in the lower run 11. In 30 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 35 barrier fluid flow 7, thus resulting in a ·· Ml »
    7242-AT ♦ · · * i · · * * * · · · · »· · * ·
    ·· M
    Pressure equalization between barrier fluid 7 and suspension 6.These expansion holes are also conceivable in the region of the inlet 5.
    The flow arrows indicate that the blocking fluid flow 7 and the feed pulp 6 mix as little as possible with one another. The barrier fluid flow 7 thus forms a barrier fluid layer 7 toward the wall of the conical deposition region 3. Optionally, additional wash or dilution water 15 can be introduced in the separation region 3 or in the underflow region, thereby further reducing the volume-related proportion of fines in the underflow 11. The orifice 14 of the upper nozzle 9 ends here in the region below the end 13 of the lamella 10.
    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 parallel here in the inlet area 2.
    FIG. 3 shows a further exemplary embodiment of the hydrocyclone 1. The conical deposition region 3 of the hydrocyclone 1 has a stepped extension, through which the barrier fluid 7 is metered. The feed pulp 6 and the barrier fluid 7 are in this case by the lamella 10, which here simultaneously forms part of the cyclone housing, · »» t · »
    · »» 7242-AT. ... · 9 * ······. The lamella 10 is conical here, and the barrier fluid flow 7 becomes tangential to the hydrocyclone 1 fed.
    4 shows a hydrocyclone 1 in which additional washing water 5 or diluting water 15 is metered in via a feed pipe 16 protruding into the underflow nozzle 8. The inlet pipe 16 is arranged centrally in the underflow nozzle 8.
    The embodiments illustrated in the drawings represent only one preferred embodiment of the invention. The invention also encompasses other embodiments in which, for example, a plurality of further inlets 5 are provided for the barrier fluid flow 7.
    权利要求:
    Claims (16)
    [1]
    ···· I ♦ * i k · k &lt; II k 4 7242-AT Claims 1. Hydrocyclone (1) having an inlet region (2) with a tangential inlet (4) for a Feed sludge (6) and a further 5 further to the inlet region (2) subsequent deposition zone (3) with an underflow nozzle (8) for removal of heavy materials or coarse grain, wherein a head nozzle (9) in the form of a dip tube axially into the interior of the hydrocyclone ( 1), characterized in that in the region of the 10 tangential inlet (4) at least one further inlet (5) for supplying a barrier fluid flow (7) is provided, wherein the barrier fluid (7) and the Aufgabetrübe (6) in the hydrocyclone (1 ) are merge and that they are separated from each other by a lamella (10) before being brought together. 15
    [2]
    2. hydrocyclone (1) according to claim 1, characterized in that via the at least one further inlet (5) of the barrier fluid flow (7) tangentially to the inlet region (2) can be fed. 20
    [3]
    3. Hydrocyclone (1) according to claim 1, characterized in that the separation region (3) is conical and that the inlet (5) the barrier fluid flow (7) tangentially the conical separation region (3), and that at the point 25 of Merging a step expansion in the hydrocyclone (1) is provided.
    [4]
    4. hydrocyclone (1) according to one of claims 1 to 3, characterized in that the lamella (10) is substantially cylindrical.
    [5]
    5. hydrocyclone (1) according to one of claims 1 to 3, characterized in that the lamella (10) is substantially conical. 35 i * * + * ·· * i * * + * ·· *

    • * • ♦ ♦ V * «· * · 7242-AT * * * • * • · • ·
    [6]
    6. hydrocyclone (1) according to one of claims 1 to 5, characterized in that extending the lamella (10) in the inlet region (2) to the transition to the deposition region (3).
    [7]
    7. hydrocyclone (1) according to one of claims 1 to 5, characterized in that the lamella (10) extends into the separation region (3)
    [8]
    8. hydrocyclone (1) according to one of claims 1 to 7, characterized in that the mouth opening (14) of the head nozzle (9) extends into the region in which the barrier fluid flow (7) and the task pulp (6) together be continued.
    [9]
    9. hydrocyclone (1) according to one of claims 1 to 8, characterized in that the lamella (10) converges at its lower end (13) pointed, so that the barrier fluid stream (7) and the Aufgabetrübe (6) are possible vortexfree zusaramenführbar. 20
    [10]
    10. hydrocyclone (1) according to one of claims 1 to 9, characterized in that in the lamella (10) equalization openings (17) for pressure equalization between the Aufgabetrübe (6) and the barrier fluid flow (7) are provided. 25
    [11]
    11. hydrocyclone (1) according to one of claims 1 to 9, characterized in that in the inlet region of the barrier fluid flow (7) in the blade (10) equalization openings (17) for pressure equalization between the Aufgabetrübe (6) and the 30 Sperrfluidstrom (7) are provided.
    [12]
    12. Hydrocyclone (1) according to one of claims 1 to 11, characterized in that in the separation area (3) or in the underflow area additional washing or dilution water 35 (15) can be introduced. ·· * · * ·· * · * *: 7242-AT

    ······························ I
    [13]
    13. A hydrocyclone (1) according to claim 12, characterized in that the additional washing or dilution water (15) via a in the underflow nozzle (8) projecting inlet pipe (16) 5 can be fed.
    [14]
    14. Hydrocyclone (1) according to claim 13, characterized in that the inlet pipe (16) is arranged centrally in the underflow nozzle (8). 10
    [15]
    15. A method for operating a hydrocyclone (1) according to any one of claims 1 to 13, characterized in that the barrier fluid flow (7) and the Aufgabetrübe (6) in the hydrocyclone (1) are continued together as soon as the Sperrfluidströmung (7) and Aufgabetrübströmströmung (6) have formed stable.
    [16]
    16. A method for operating a hydrocyclone (1) according to claim 15, characterized in that in the underflow nozzle 20 (8) washing or dilution water (15) is injected.
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    法律状态:
    2015-09-15| PC| Change of the owner|Owner name: ANDRITZ AG, AT Effective date: 20150721 |
    优先权:
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    ATA177/2012A|AT511837B1|2012-02-10|2012-02-10|HYDROCYCLONE WITH FINANCIAL SUPPLEMENT IN THE CYCLONE SUBSTITUTE|ATA177/2012A| AT511837B1|2012-02-10|2012-02-10|HYDROCYCLONE WITH FINANCIAL SUPPLEMENT IN THE CYCLONE SUBSTITUTE|
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    IN7470DEN2014| IN2014DN07470A|2012-02-10|2014-09-04|
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