EP2066461A1 - Séparateur à air centrifuge - Google Patents

Séparateur à air centrifuge

Info

Publication number
EP2066461A1
EP2066461A1 EP07788486A EP07788486A EP2066461A1 EP 2066461 A1 EP2066461 A1 EP 2066461A1 EP 07788486 A EP07788486 A EP 07788486A EP 07788486 A EP07788486 A EP 07788486A EP 2066461 A1 EP2066461 A1 EP 2066461A1
Authority
EP
European Patent Office
Prior art keywords
centrifugal separator
flow
separator according
classifier
flow path
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP07788486A
Other languages
German (de)
English (en)
Other versions
EP2066461B1 (fr
Inventor
Thomas Pistorius
Christian Storm
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Babcock Borsig Steinmueller GmbH
Original Assignee
Babcock Borsig Service GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
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Application filed by Babcock Borsig Service GmbH filed Critical Babcock Borsig Service GmbH
Publication of EP2066461A1 publication Critical patent/EP2066461A1/fr
Application granted granted Critical
Publication of EP2066461B1 publication Critical patent/EP2066461B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
    • B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force

Definitions

  • the invention relates to a centrifugal separator with a feed channel for a coarse and fine particles containing flow, a first discharge channel for a predominantly coarse particles containing flow, a second discharge channel for a predominantly fine particles containing flow and a classifier space with at least one classifier, wherein the classifier space Supply channel connects to the first discharge channel and the second discharge channel and wherein the supply channel, the classifier space and the two discharge channels form a flow path.
  • the invention further relates to a method for sifting a coarse and fine particle-containing flow with such a centrifugal separator.
  • Centrifugal funnels are devices with which coarse particles (coarse dust) of fine particles (fine dust) in a flow, called a two-phase flow, are separated.
  • the particles fall, for example, in a mill for hard coal grinding by crushing the ground material and are then guided by a carrier gas stream to the separator.
  • centrifugal static, dynamic or static-dynamic design A distinction centrifugal static, dynamic or static-dynamic design. Common to all centrifugal separators is that the flow entering by means of the carrier gas is guided radially from outside to inside through the separator and with a twist is provided. The separation between coarse and fine dust takes place due to the forces acting on the different particles, in particular centrifugal and gravitational forces.
  • the insufficiently ground coarse dust is separated and returned to the grinding table via a first discharge channel, which may have a semolina return cone.
  • the sufficiently ground fine particulate matter is removed via a second discharge channel, which may have one or more dust lines, for example, to a burner of a furnace.
  • Mills having centrifugal separators are known, in which the gas flow laden with grinding dust, enriched with purging gases and vapors from the milling process, enters the outer classifier space through the employment of the nozzles on the nozzle ring of the mill. Much of the flow rises up to the sifter cover and bounces off there. In centrifugal movements, the flow is then supplied to the inner reformerraum beyond a blind with fixed blades and a rotating in the inner admirerraum louvred rotor.
  • the blind serves as a sifter of fixed slats, which pass through the flow path partially or completely. Versions without blind slats are also known.
  • the rotating lamellar rotor represents a further classifying device.
  • the separated coarse dust then slips back between the fixed louvre and the rotor via the semolina return cone onto the grinding table.
  • a problem with the centrifugal separator described above is that the flow between the supply duct and the lamellar rotor still has a relatively high twist and that, despite the two classifying devices, relatively large quantities of pulverized dust reach the region beyond the lamellar rotor.
  • the lamellar rotor is subjected to relatively high loads and the degree of separation or the selectivity is reduced. The result is a reduced efficiency of the known centrifugal separator.
  • the object of the present invention is to provide a centrifugal separator and a corresponding screening method, with which the efficiency is improved.
  • the previously derived and indicated object is achieved in that, as a first classifying device, one or more separating pockets are arranged in the classifier space which project into the flow path.
  • a part of the particles are deflected so that they cross another part of the flow, preferably transversely.
  • the twist is the deflected Particles due to the separation pockets less than the swirl of the intersecting partial flow. It has been found that, from the deflected, less twisted part flow, a large part of the still contained fine particles is entrained by the second, more strongly twisted part flow, which flows crosswise, so that the remaining, downwardly moving particles are predominantly coarse particles. In this way, the selectivity and thus the efficiency of the centrifugal separator is further increased.
  • a plurality of fixed lamellae are arranged in the classifier space as a second classifying device and project into the flow path.
  • a plurality of lamellae arranged on a rotor can be arranged in the classifier space as a third classifying device, which project into the flow path.
  • the centrifugal separator is preferably a rotary sifter, also called a siping classifier, rotary sifter or dynamic sifter, which in particular has a cylindrical separator space.
  • a static centrifugal separator also called a folding classifier
  • a folding classifier In the latter case, no rotatable rotor would be present, but a plurality of concentrically arranged flaps.
  • the best result in terms of selectivity is achieved when a lamellar rotor is provided as the second classifying device, a ring of blind slats in combination with the separation pockets and as a further classifier.
  • the separation pockets, the Venetian blinds and / or the rotor blades may be annular, in particular concentric, be arranged in the classifier space, resulting in a particularly compact design of the classifier.
  • the separation pockets may be formed in various ways to reduce the swirl of a portion of the flow.
  • the deposition pockets preferably each have a rear wall and at least one side wall.
  • the rear wall is arranged relative to the course of the flow path in particular such that when flowing through the reformerraums the described effect occurs, after which a first partial flow of the flow is deflected and a second partial flow of the flow at an angle, in particular at an angle of 90 degrees, flows.
  • the at least one side wall may be arranged relative to the path of the flow path such that, as it flows through the classifier, the first partial flow of the flow after impinging on the first classifier has less swirl than prior to impacting the first classifier, and then as previously mentioned The swirl of the diverted partial flow is smaller than that of the intersecting partial flow.
  • a single separation pocket is provided and the rear wall forms a guide element which is concentric relative to the central axis of the separator space and projects into the flow path.
  • a separation pocket represents the minimum for the desired swirl reduction to occur.
  • a plurality of separation pockets are provided and form the rear walls together a concentric with respect to the central axis of the classifier Kauselement which projects into the flow path.
  • the guide element which may be arranged between the second and the third classifying means or between the Venetian blinds and the lamellar rotor, in a section transverse to the central axis of the classifier space, the shape of a ring which is closed in particular circumferentially.
  • the term ring is not necessarily meant an annular shape, but the guide element may also have a polygonal shape in a section transverse to the central axis of the classifier space.
  • a classifier cover also referred to as classifier cover
  • classifier cover which closes the classifier space in the axial direction with the exception of an opening opening into the second discharge channel.
  • the guide element is advantageously connected to the classifier cover. In this way, the guide element, in particular when using a twisted flow, projects into the flow path.
  • the part of the flow with the coarse particles is decelerated and deflected, whereby the coarse particles are separated by the other part of current possibly still existing fine dust.
  • the guide element which can run concentrically around the center axis of the particular cylindrical bombarderraums, with a portion of the slats of the second classifying device, so the blind slats, connected.
  • the section in particular forms at least part of the side wall.
  • the guide element can then form the separation pockets.
  • the sifter cover forms the top of the deposition pockets, the guide the back and two adjacent lamellae a side wall.
  • Such formed pockets are, as has been found, particularly suitable for redirecting and decelerating a partial flow.
  • the twisting of this partial flow is reduced.
  • the internal circulation of the mill is relieved, because not so much fine dust gets back into the mill, and at the same time the load of the lamellar rotor of the centrifugal separator can be reduced.
  • the guide element is advantageously arranged at an angle, in particular perpendicular, to the course of the flow path.
  • the course of the flow path is meant immediately before impingement of the flow on the deposition pockets.
  • the flow at this point runs radially from outside to inside.
  • the centrifugal separator according to the invention can be adapted to different flow conditions, for example particle sizes, fractions of coarse and fine dust, flow velocity, etc.
  • the position within the classifier space of at least one of the deposition pockets can be changed.
  • the volume of at least one of the deposition bags can be changed.
  • the rear wall, the side wall and / or the classifier cover in the axial, radial and / or circumferential direction and / or adjustable in angle.
  • the first separator device in particular the guide element, traverses the flow path to 10 to 50%, preferably to 20 to 40% and in particular to 30%.
  • the first separator device or the guide element blocks or closes the flow path at this point and diverts a corresponding proportion of the total flow and brakes it.
  • the remaining part of the flow path ie at least 50%, preferably at least 60% and in particular 70%, are occupied by the remaining part of the flow, which thwarts the diverted part of the flow.
  • the second classifying device in particular the blind slats, passes completely through the flow path according to a further embodiment, that is to say 100%.
  • the third classifying device in particular the lamellae of the rotor, which can also pass completely through the flow path, that is to say to 100%.
  • the lamellae run transversely to the flow direction, in each case from one side to the opposite side of the flow path.
  • the Flow path of the slats and the rotor is not completely, but only partially, is traversed.
  • the axis of rotation of the rotor extends coaxially to the central axis of the particular cylindrical bombarderraums. Also coaxial with the central axis of the classifier space and within the lamellar rotor is preferably the coal downpipe or another downpipe for the supply of the ground material to be comminuted to a mill.
  • the centrifugal separator may also be an integral part of a mill with a grinder or be connectable to the mill.
  • a mill which is in particular a vertical mill or a tubular ball mill and is preferably used for grinding hard coal, hard lignite, limestone, gypsum and / or cement clinker, is by simple means by separation pockets that allow a crossing of two partial flows and a swirl reduction of a partial flow , achieved a significant increase in selectivity and relieved the internal mill cycle.
  • the first discharge channel has a semolina return cone leading to the mill of the mill.
  • the semolina return cone is also arranged concentrically around the central axis of the classifier space or its extension. In this way, in particular when the drop tube extends within the slat rotor and within the pouring return cone, a compact design of the centrifugal separator is achieved.
  • the second discharge channel has according to another embodiment of the present invention, at least one dust line, which leads, for example, to a burner of a furnace. It can also be provided a plurality of dust lines.
  • the object is achieved in a method of the type mentioned above using the centrifugal separator described above, that a first partial flow of the flow, which is advantageously applied before striking the first classifying device with a twist on Abscheidetaschen a first separator device is deflected and a second partial flow of the flow at an angle, in particular flows transversely.
  • this method significantly improves the efficiency of a centrifugal separator by increasing the selectivity.
  • the internal mill circuit is also relieved and the loads on the centrifugal separator are reduced.
  • the twist is generated by supplying a twisted Traggasstroms.
  • This can be achieved by making the nozzles on the nozzle ring of the mill in a certain direction and at a certain angle relative to the center axis of the nozzle ring.
  • the separation pockets is also advantageously achieved that the first partial flow of the flow after hitting the first classifying device has a smaller swirl than before impinging on the first classifying device.
  • the centrifugal separator is operated in overpressure.
  • the centrifugal separator according to the invention can also be operated under reduced pressure. Both are possible by the inventive design of the centrifugal separator and also leads to a significant improvement in the selectivity when viewing a coarse and fine particle-containing flow, which is in particular a two-phase flow.
  • FIG. 1 is a schematic representation of a - partially cut - centrifugal separator according to an embodiment of the present invention
  • Fig. 2 is a section in the longitudinal direction of the centrifugal separator of Fig. 1, and
  • FIG. 3 shows a section in the transverse direction of the centrifugal separator of FIG. 1.
  • FIG. 1 shows a centrifugal separator in the form of a rotary sifter according to an embodiment of the present invention, the Supply channel 1 for a coarse and fine particles containing two-phase flow S, shown here by arrows. Furthermore, a first discharge channel 2 is provided for a flow containing predominantly coarse particles and a second discharge channel 3 for a flow containing predominantly fine particles.
  • the division into the flow containing coarse particles and the flow containing the fine particles takes place in a classifier space 4 with three separate classifying devices 5, 7 and 9.
  • the classifier space 4 connects the supply channel 1 with the first discharge channel 2 and the second discharge channel 3 in that the classifier space 4 is cylindrical and, as soon as the flow S to be observed has ascended from a mill (not shown) through the supply duct 1 under twisting, is flowed through radially from outside to inside.
  • the supply channel 1, the classifier space 4 and the two discharge channels 2 and 3 form a flow path through the centrifugal separator.
  • first classifying device 5 As a first classifying device 5 several separation pockets 6 are arranged in the classifier space 4, which protrude into the flow path. As a result of the separation pockets 6, a first partial flow S1 of the flow S in the upper part of the classifier space 4 is deflected near the classifier cover 16, wherein the swirl of the partial flow S1 is also reduced. Further, the remaining partial flow S2 of the flow S radially into the interior of the centrifugal separator, wherein it crosses the deflected flow Sl. By reducing the twist, the first partial flow is slowed down so much that coarse particles fall out of the flow and over the semolina return cone 18 be led back to the mill of the mill.
  • the falling out coarse particles of the first partial flow S1 are thereby flowed through by the crossing partial flow S2, wherein residual fine dust is entrained.
  • the proportion of fine dust, which is returned with the coarse particles to the grinder reduced to a minimum, which relieves the internal circulation of the mill.
  • the partial flow S2 is guided by the shutter slats 8 of the second classifying device 7 and the slats 11 of the rotor 10 of the third classifying device 9.
  • the remaining part of the flow S which has a sufficiently high proportion of fine dust, is passed through the opening 15 in the second discharge channel 3 and from there into a dust line 19, which in the illustrated embodiment to a burner (not shown).
  • the deposition pockets 6 are formed and arranged in the exemplary embodiment shown here as follows.
  • the separation pockets 6 each have a rear wall 12 and at least one side wall 13. At the top, the separation pockets 6 are bounded by the underside of the classifier cover 16. Together, the rear walls 12 of the deposition pockets 6 form a relative to the central axis Xl the classifier space 4 concentric guide element 14 which projects into the flow path. In this case, the guide element 14 or each rear wall 12 is arranged relative to the course of the flow path such that when flowing through the classifier 4, a first partial flow Sl is deflected as described above so that it flows against a second partial flow S2 transversely.
  • the guide element 14 and the separation pockets 6 have in a section transverse to the central axis Xl of the classifier space 4 in the form of a circumferentially closed circular ring. This is apparent in particular from Fig. 3, which will be described below.
  • Fig. 1 it is further shown that the guide element 14 is perpendicular to the course of the flow path, meaning the flow path is arranged immediately before entering the deposition pockets 6.
  • the guide element 14 is connected to the classifier cover 16 and extends from the classifier cover 16 in the direction of the first discharge channel 2.
  • the guide element 14 extends so far into the flow path that it passes through about 30% and thus closes at 30%.
  • the guide element 14 is arranged at a position, namely between the fins 11 of the rotor 10 and the fins 8 of the Venetian blind and at the same time as the opening of the first discharge channel 2 formed as semolina return cone 18, so that the coarse particles removed from the first partial stream S1 by means of the deposition pockets 6 can fall into said semolina return cone 18.
  • the blind slats 8 and the rotor blades 11 completely pass through the flow path, that is to say 100%.
  • FIG. 2 shows a sectional view of the centrifugal separator described above with reference to FIG. 1.
  • the sectional view shows next to the inlet duct 1, the classifier 4 and the drainage channels 2 and 3 also clearly the central downpipe 20, in which the coal, here hard coal, the grinder is supplied. To this drop tube 20, the remaining components are arranged concentrically, resulting in a particularly compact design of the centrifugal separator and the mill.
  • Fig. 3 again clearly shows the concentric arrangement of the individual components of the rotary sifter in a section transverse to the longitudinal axis of the sifter.
  • a twisted flow S which has ascended axially into the classifier space 4 flows radially from outside to inside through the individual classifying devices 5, 7 and 9.
  • the flow S partially flows from the outer portion of the classifier space 4 and in the separation pockets 6, whereby a first partial flow Sl is produced with reduced swirl, which is deflected axially downwards, whereas a second partial flow S2 is passed through the fixed Venetian blind slats 8 and thereby the Partial flow Sl, and in particular the particles crosses therein and entrained therein particulate matter.
  • the particles separated when passing or passing through the individual classifying devices are again guided axially downwards in a flow S3 through the semolina return cone 18 in order to be further comminuted by the grinder of the mill.
  • a partial flow S4 is formed, which is passed in the provided with lamellae 11 rotor 10 in the inner part of the classifier space 4, in which case a further sighting takes place.
  • the fine dust remaining after the individual screening steps is finally guided through an opening in the classifier cover 16 axially upwards into the second discharge channel 3 and via a dust line 19 to a burner (not shown).
  • the centrifugal separator exemplified in FIGS. 1 to 3 also has the advantage that a sighting is already carried out before passing through the lamellae 8 and 11, by means of which a large part of coarse particles is removed from the flow and returned to the grinding mechanism. In this way, the selectivity can be significantly increased, the internal mill circuit can be relieved and the efficiency of the centrifugal separator and the mill can be increased. Also, stresses that flow through the particles to the components of the centrifugal separator, especially the slats, act, kept to a minimum.

Landscapes

  • Centrifugal Separators (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Cyclones (AREA)

Abstract

L'invention concerne un séparateur à air centrifuge comprenant un canal d'amenée (1) pour un écoulement (S) contenant des particules grossières et fines, un premier canal de dérivation (2) pour un écoulement contenant principalement des particules grossières, un second canal de dérivation (3) pour un écoulement contenant essentiellement des particules fines et un compartiment pour séparateur à air (4) comprenant au moins un séparateur à air. Le compartiment pour séparateur à air (4) relie le canal d'amenée (1) au premier canal de dérivation (2) et au second canal de dérivation (3), le canal d'amenée (1), le compartiment pour séparateur à air (4) et les deux canaux de dérivation (2, 3) formant un trajet d'écoulement. L'invention vise à améliorer le rendement. À cet effet, une ou plusieurs poches de séparation (6) sont disposées dans le compartiment pour séparateur à air (4) en tant que premier séparateur à air (5), ces dernières faisant saillie dans le trajet d'écoulement. L'invention concerne en outre un procédé correspondant destiné à séparer les particules grossières et fines contenues dans un écoulement (S).
EP07788486A 2006-09-20 2007-08-17 Séparateur à air centrifuge Not-in-force EP2066461B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006044833A DE102006044833B4 (de) 2006-09-20 2006-09-20 Zentrifugalsichter und Verfahren zum Sichten
PCT/EP2007/058588 WO2008034680A1 (fr) 2006-09-20 2007-08-17 Séparateur à air centrifuge

Publications (2)

Publication Number Publication Date
EP2066461A1 true EP2066461A1 (fr) 2009-06-10
EP2066461B1 EP2066461B1 (fr) 2010-07-28

Family

ID=38823616

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07788486A Not-in-force EP2066461B1 (fr) 2006-09-20 2007-08-17 Séparateur à air centrifuge

Country Status (8)

Country Link
US (1) US8033399B2 (fr)
EP (1) EP2066461B1 (fr)
AT (1) ATE475490T1 (fr)
AU (1) AU2007299162B2 (fr)
CA (1) CA2689645C (fr)
DE (2) DE102006044833B4 (fr)
DK (1) DK2066461T3 (fr)
WO (1) WO2008034680A1 (fr)

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Also Published As

Publication number Publication date
DE102006044833B4 (de) 2010-01-21
DE102006044833A1 (de) 2008-03-27
US20090294333A1 (en) 2009-12-03
DK2066461T3 (da) 2010-10-25
EP2066461B1 (fr) 2010-07-28
WO2008034680A1 (fr) 2008-03-27
US8033399B2 (en) 2011-10-11
DE502007004594D1 (de) 2010-09-09
CA2689645C (fr) 2013-03-19
AU2007299162A1 (en) 2008-03-27
AU2007299162B2 (en) 2011-11-17
ATE475490T1 (de) 2010-08-15
CA2689645A1 (fr) 2008-03-27

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