WO2020152035A1 - Séparateur de colonne montante - Google Patents

Séparateur de colonne montante Download PDF

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Publication number
WO2020152035A1
WO2020152035A1 PCT/EP2020/051085 EP2020051085W WO2020152035A1 WO 2020152035 A1 WO2020152035 A1 WO 2020152035A1 EP 2020051085 W EP2020051085 W EP 2020051085W WO 2020152035 A1 WO2020152035 A1 WO 2020152035A1
Authority
WO
WIPO (PCT)
Prior art keywords
riser
conveying air
pipe
air
conveying
Prior art date
Application number
PCT/EP2020/051085
Other languages
German (de)
English (en)
Inventor
Niko Hachenberg
Original Assignee
Khd Humboldt Wedag 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
Application filed by Khd Humboldt Wedag Gmbh filed Critical Khd Humboldt Wedag Gmbh
Priority to EP20701551.2A priority Critical patent/EP3914399A1/fr
Publication of WO2020152035A1 publication Critical patent/WO2020152035A1/fr

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
    • B07B7/10—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force having air recirculating within the apparatus
    • 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
    • B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/04—Control arrangements
    • 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
    • B07B7/086—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by the winding course of the gas stream

Definitions

  • the invention relates to a riser classifier, comprising a riser pipe for the pneumatic transport of granular material suspended in conveying air, the riser pipe having a vertical conveying direction component, a swirling device arranged in the riser pipe, which gives the conveying air a swirl, an immersion pipe arranged above the swirling device, which extends the air path for the conveying air, an annular gap being present between the riser pipe and the immersion pipe, through which coarse-grained material, which was thrown outwards by the swirl of the conveying air in a radial direction with respect to the conveying direction of the conveying air, from the conveying air , which flows into the immersion tube, excretes, and a circuit grinding system having such a classifier.
  • the classifier principle is based on the principle of inertia of coarser grains, which are conveyed differently by the air in which they are suspended. A larger grain is less affected by the conveying air due to the lower air resistance in relation to the volume and its weight than a smaller grain which is carried more strongly by the conveying air. The way the conveying air acts on the material to be separated is different for each classifier.
  • classifier efficiency i.e. the separation performance for a one-off Throughput
  • the additional pressure loss of the conveying air in which the material to be separated is suspended the cost of maintaining the sifter if the sifter has moving components
  • the maintenance effort the tendency to become blocked in the event of a sudden system shutdown
  • the overall height with each measurement ter consumes additional energy for conveying the material to be separated against gravity
  • the assembly time for the first installation in an existing system in which the separation of material to be separated into its grain size fractions is to take place.
  • the object of the invention is therefore to provide such a classifier len.
  • the object of the invention is achieved by a riser sifter with the features of claim 1. Further advantageous embodiments of the riser sifter are specified in the subclaims to claim 1. A circular grinding plant having this classifier is specified in claim 6.
  • the classifier in a pneumatic conveyor pipe, the pneumatic conveyor pipe having a vertical conveying direction component.
  • the separation of the material to be separated into at least two grain size fractions takes place in that a swirling device in the riser pipe gives the conveying air a swirl.
  • the conveying air moves with a linear and vertical directional component as well as with an approximately circular rotation component.
  • These two directional components lead to an approximately helical flow.
  • the grains suspended in the conveying air experience a centrifugal force.
  • the coarser grains experience a lower air resistance in the viscous air in relation to their own mass and thus to their centrifugal force acting on them than grains with a smaller grain size.
  • the coarser grains collect in the outer area of the vortex, the helically flowing conveying air.
  • the annular gap separates the outer region of the vortex from the inner region of the vortex of the conveying air.
  • the inner area of the vortex which carries the grains with a smaller grain size, flows into the dip tube which is immersed in the riser pipe.
  • the outer area of the vortex of the conveying air which contains the coarser grains with the larger average diameter, flows into the annular gap.
  • the riser classifier comprising a riser pipe for the pneumatic transport of granular material suspended in conveying air, the riser pipe having a vertical conveying direction component, a swirling device arranged in the riser pipe, which gives the conveying air a swirl, one above the swirling device arranged dip tube, which extends the air path for the conveying air, an annular gap being present between the riser tube and the dip tube, through which coarse-grained material, which is thrown outwards by the swirl of the conveying air in a radial direction with respect to the conveying direction of the conveying air was excreted from the conveying air flowing into the immersion tube.
  • the swirling device of the riser sifter according to the invention can be designed differently.
  • the swirling device consists of an approximately centrally arranged peller in the riser. If the impeller is static, it is fixed in the middle of the riser. If the conveying air sweeps over the impeller, it experiences a swirl, which leads to a helical flow with formation of a vortex with the initially explained and desired effect.
  • the static, but height and winkelverstellba re adjustable impeller has the advantage of a particularly favorable structure with only a small pressure drop when forming a vortex, the magnitude of the pressure loss depends on the air resistance of the impeller.
  • the impeller In order to increase the turbulence and thus increase the separation performance, it can be provided to drive the impeller.
  • the impeller thus has a promotional effect and also the effect of forming a vortex.
  • the qualitative separation effect is also an important parameter that is important for the use of a classifier in a system is.
  • the height of the swirling device in relation to the annular gap is variable and adjustable.
  • the swirling device can be suspended in the riser pipe on a ring segment or in a cage, the ring segment or the cage being adjustable through a vertical slot in the riser pipe. Through the slot, the cage or the ring segment can be attached to various positions from the outside.
  • the vertical slot in the riser can be covered from the outside to maintain the pressure in the riser. It is also possible to provide a helical slot in the riser and to adjust the height of the interlacing device by rotating an adjusting lever protruding through the slot with the ring segment or the cage.
  • the separation effect of the annular gap which separates the outer part of the vortex of the conveying air from the inner part of the vortex, attacks at various points of a steady state of the grain size distribution within the vortex. This changes the grain size composition of the two fractions that flow once into the dip tube and one into the annular gap.
  • a concrete application for the immersion pipe sifter presented here is a circular grinding system in which a fraction with larger grains is fed back into the grinding circuit.
  • Flierzu is a circuit grinding plant claimed, comprising a comminution device, such as an impact hammer mill, a high-pressure roller press or a roller mill, a downpipe through which grinding is well fed to the comminution device, and a riser sifter as described above, a housing that the conveying air separates from the atmospheric air, the riser pipe of the riser sifter and the down pipe being connected to the housing, the annular gap being connected to the down pipe.
  • a comminution device such as an impact hammer mill, a high-pressure roller press or a roller mill
  • a downpipe through which grinding is well fed to the comminution device
  • a riser sifter as described above
  • a housing that the conveying air separates from the atmospheric air, the riser pipe of the riser sifter and the down pipe
  • FIG. 2 shows an enlarged detail from FIG. 1, showing the riser itself
  • Fig. 3 is a sketch to illustrate the influence of the altitude of the Ver vortexing device on the qualitative separation performance
  • FIG 1 a sketch is shown with a Kreislaufmahlanlge, in which the riser sifter 1 according to the invention is integrated.
  • the riser classifier 1 consists of a riser pipe 5 for the pneumatic transport of granular material 15 suspended in conveying air 10.
  • the riser pipe 5 always has a vertical conveying direction component.
  • the direction of conveyance is exactly vertical.
  • the riser sifter 1 has a swirling device 20 which is arranged in the riser 5 and which controls the conveying air 10 gives a twist. Above the swirling device 20, a dip tube 25 is arranged, which extends the air path for the conveying air 10.
  • annular gap 30 is present between the riser tube 5 and the immersion tube 10.
  • coarse-grained material 35 exits from the conveying air 10, because the coarse-grained material 35 by the swirl of the conveying air 10 in the radial direction with respect to the conveying direction of the conveying air 10 to the outside, that is, in the direction of the wall of the riser pipe 1, ge was hurled.
  • the rest of the conveying air 10 flows into the immersion tube 25.
  • FIG. 2 shows that the conveying air 10, which flows into the riser pipe 1 from below, receives a swirl through the swirling device, here a static, but optionally also height-adjustable and / or angle-adjustable impeller.
  • the swirl in is shown in Figure 2 by the wavy lines. Larger granules of the material to be separated are carried outwards against the air resistance by the centrifugal force acting on them during the vortex movement. The trace of a single grain of the material to be separated is thus approximately that of a spiral which widens upwards.
  • annular gap 30 In the upper part of the riser pipe 1 there is an annular gap 30 between the dip tube 25, which projects down into the riser pipe 1, and the riser pipe 1 itself. This annular gap 30 separates the front between a fraction of coarse-grained material and a fraction with finer material that is discharged through the immersion tube 25.
  • the height adjustability is indicated by the double arrow to the right of the impeller 20 and the angle adjustability by the angle symbol a.
  • FIG. 3 shows a sketch which serves to understand the effect of the height adjustment of the swirling device.
  • the swirling device leads to a swirl, with more coarse-grained material 35 being present in the outer regions of the swirl.
  • This coarse-grained material 35 is slowly ge on the trip from the swirling device 20 to the annular gap 30 to the outside. This creates a cone-shaped front between the fine goods and coarse-grained material 35, which is represented here by the truncated cone, which becomes darker on the outside and upside down.
  • the annular gap 30 meets a different front depending on the height of the swirling device 20 in the darker and outer area of the grain size front shown as a truncated cone .
  • the grain size fraction can be varied. If the swirling device 20 is pushed upwards, the coarse-grained material will contain more fine material than if the Verwirbelungsvor direction is pushed downwards.
  • riser sifters 1, a housing 50 for an impact hammer mill as comminution device 40 and a downpipe 45 for regrind are connected to one another and thus separate the conveying air 10 from the atmospheric air.
  • Grist 55 which is given up by the fall tube 45 on the impact hammer mill as a crushing device 40, is crushed there and conveyed by the conveying air 10 through the Verwirbelungsvor device 20.
  • the swirling device swirls the conveying air with the ground material suspended and comminuted therein, which, as described, separates the ground material into different fractions of different grain size compositions.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Cyclones (AREA)

Abstract

L'invention concerne un séparateur (1) de colonne montante, qui comporte : une colonne montante (5) pour le transport pneumatique de produits (15) granulaires en suspension dans de l'air de convoyage (10), la colonne montante (5) comportant un composant de direction de convoyage vertical ; un dispositif de tourbillonnement (20) disposé dans la colonne montante (5), lequel confère à l'air de convoyage (10) une torsion ; un tube plongeur (25) disposé au-dessus du dispositif de tourbillonnement (20), lequel prolonge le trajet d'air pour l'air de convoyage (10). Une fente annulaire (30) est présente entre la colonne montante (5) et le tube plongeur (25), par laquelle des produits (35) granulaires, qui ont été évacués vers l'extérieur du fait de la torsion de l'air de convoyage (10) dans la direction radiale par rapport à la direction de convoyage de l'air de convoyage (10), sont séparés de l'air de convoyage (10) qui circule dans le tube plongeur (25). L'invention concerne également une installation de broyage à circulation comportant un séparateur (1) de ce type.
PCT/EP2020/051085 2019-01-25 2020-01-17 Séparateur de colonne montante WO2020152035A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20701551.2A EP3914399A1 (fr) 2019-01-25 2020-01-17 Séparateur de colonne montante

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202019100420.7U DE202019100420U1 (de) 2019-01-25 2019-01-25 Steigrohrsichter
DE202019100420.7 2019-01-25

Publications (1)

Publication Number Publication Date
WO2020152035A1 true WO2020152035A1 (fr) 2020-07-30

Family

ID=65441564

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2020/051085 WO2020152035A1 (fr) 2019-01-25 2020-01-17 Séparateur de colonne montante

Country Status (3)

Country Link
EP (1) EP3914399A1 (fr)
DE (1) DE202019100420U1 (fr)
WO (1) WO2020152035A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1724041A (en) * 1927-01-05 1929-08-13 Harold M Plaisted Separator
DE832238C (de) * 1950-07-09 1952-02-21 Babcock & Wilcox Dampfkessel W Windsichter
DE1218264B (de) * 1959-08-08 1966-06-02 Alpine Ag Umluftsichter
DE2456970A1 (de) * 1974-12-03 1976-06-16 Pfeiffer Barbarossawerke Sichter
EP0164859A2 (fr) * 1984-06-14 1985-12-18 F.L. Smidth & Co. A/S Séparateur

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1724041A (en) * 1927-01-05 1929-08-13 Harold M Plaisted Separator
DE832238C (de) * 1950-07-09 1952-02-21 Babcock & Wilcox Dampfkessel W Windsichter
DE1218264B (de) * 1959-08-08 1966-06-02 Alpine Ag Umluftsichter
DE2456970A1 (de) * 1974-12-03 1976-06-16 Pfeiffer Barbarossawerke Sichter
EP0164859A2 (fr) * 1984-06-14 1985-12-18 F.L. Smidth & Co. A/S Séparateur

Also Published As

Publication number Publication date
EP3914399A1 (fr) 2021-12-01
DE202019100420U1 (de) 2019-02-01

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