EP2785472B1 - Device for classifying grainy products - Google Patents
Device for classifying grainy products Download PDFInfo
- Publication number
- EP2785472B1 EP2785472B1 EP12790561.0A EP12790561A EP2785472B1 EP 2785472 B1 EP2785472 B1 EP 2785472B1 EP 12790561 A EP12790561 A EP 12790561A EP 2785472 B1 EP2785472 B1 EP 2785472B1
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- EP
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- Prior art keywords
- separator
- housing
- static
- accordance
- classifier
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- 230000003068 static effect Effects 0.000 claims description 91
- 239000000463 material Substances 0.000 claims description 83
- 238000000227 grinding Methods 0.000 claims description 21
- 239000008187 granular material Substances 0.000 claims description 11
- 238000000926 separation method Methods 0.000 claims description 9
- 238000006073 displacement reaction Methods 0.000 claims 1
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 16
- 230000000007 visual effect Effects 0.000 description 9
- 239000004568 cement Substances 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 230000004438 eyesight Effects 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 241000237858 Gastropoda Species 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 235000019738 Limestone Nutrition 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 241000273930 Brevoortia tyrannus Species 0.000 description 1
- 206010017577 Gait disturbance Diseases 0.000 description 1
- 206010039509 Scab Diseases 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000010327 methods by industry Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 210000001991 scapula Anatomy 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000004382 visual function Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
- B07B4/08—Separating solids from solids by subjecting their mixture to gas currents while the mixtures are supported by sieves, screens, or like mechanical elements
-
- 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
- B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
- B07B4/02—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall
- B07B4/04—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall in cascades
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
- B02C21/002—Disintegrating plant with or without drying of the material using a combination of a roller mill and a drum mill
- B02C21/005—Disintegrating plant with or without drying of the material using a combination of a roller mill and a drum mill the roller mill having cooperating rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
- B02C23/12—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
-
- 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
- B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
- B07B9/02—Combinations of similar or different apparatus for separating solids from solids using gas currents
Definitions
- the invention relates to an apparatus for sifting granular material into at least three fractions, with at least one static sifter forming a first sifting stage and at least one dynamic sifter forming a second sifting stage, wherein the static sifter in a classifier housing having at least one first material inlet, at least one classifying gas inlet and at least one coarse material outlet has a plurality of impact-type and guide structures arranged in a staircase manner with one another, wherein the dynamic classifier is designed as a rod basket classifier with a rotating rod basket and has a second classifier housing with at least one middle product outlet and a fine material outlet.
- the grainy good may, for. B. cement, cementitious materials, cement raw material, limestone or slag but also to ores or the like.
- roller presses or good bed roller mills are used in practice. In this high-pressure crushing of the granular material to be crushed this in the gap between two press rolls (Gutbettzerkleintation). In the course of comminution, agglomerates are formed, called slugs.
- Such good bed roller mills can be operated in a closed circuit with static and / or dynamic classifier. The good bed roller mill is then positioned below a sifter, for example, so that the coarse material fraction emerging from the sifter is (again) fed to the roller mill.
- the material emerging from the roller mill is in turn fed to the material inlet of the viewing device, which is composed as a multi-stage device of a static classifier and a dynamic classifier.
- the static classifier a deagglomeration of the slugs takes place via the baffles and Leitinstallations, and at the same time the coarse material fraction is deposited and fed to the roll press.
- the "finer" material passes with the classifier gases into the dynamic classifier, where it is subjected to fine classification.
- the fines from this classifier are removed together with the classifying gas and collected in the following cyclones and / or filters as finished product.
- the weighted from the dynamic classifier middle fraction can, for. B. also be fed again to the roll press or another grinding stage.
- Such measures are known from the prior art (cf. DE 43 37 215 A1 ).
- a generic sighting device of the type described above is known z. B. from the DE 42 23 762 B4 ,
- This classifier has in a housing a rotatably driven rod basket with distributed over the rotor circumference arranged turbo elements and with inlets and outlets for reformluft, reformgut, fines, medium and coarse material.
- the horizontally arranged bar basket is preceded by a shaft-like caution chamber at the same height at the same height, the top of a view of the separate air entry port for the preparegut, the side of the rod basket opposite arranged opening for the classifying air, below a discharge opening for a coarse grain fraction and two opposing, has between it a caution zone forming, permeable to the view air shaft boundary walls.
- the viewing device of JP-6-106 135 A where the sieve basket of the dynamic classifier rotates around a vertical axis.
- FIG. 7 An alternative embodiment of a multi-level classifier with a compact design is known from US Pat. No. 7,854,406 B2 known.
- the viewing device consists of a plurality of concentric housings, wherein a rotating about a vertical axis rod basket is provided as a Nachsichttre.
- the precautionary stage is formed by a simple cyclone with the sight and the sighting gas supplied via a common supply line spirally connected to the classifier housing. A deagglomeration of the scapula is limited in the static vision level possible.
- the describes DD 253771 A1 an air classifier for classifying in particular fine-grained bulk materials in at least two fractions, consisting of a cylindrical upper housing part, which is followed by a semolina cone with Gr manaustrag below.
- the rod basket rotates about a vertical axis.
- a ring container is provided with a floating floor as a dispersing device, which is arranged above the sortgaseineriesstutzens in the region of the bar basket inside or outside of the classifier and is in communication with the viewing space via an annular gap and / or an annular channel.
- the invention is therefore an object of the invention to provide a device for sifting granular material in at least three fractions of the type described above, which is characterized not only by a particularly compact design, but in particular by low investment and operating costs and higher visual efficiency.
- a sifting device should enable economical operation of a grinding plant with at least one roller press with high visual efficiency.
- the invention provides a device for sifting granular material in at least three fractions, which has the features of claim 1.
- the invention is initially based on the principle known knowledge that it is advantageous to combine a static sifter and a dynamic sifter in the embodiment as Stabkorbsichter with each other, as on the static sifter, a first coarse material fraction can be viewed, so that the dynamic Classifier with the relatively sensitive rotating components is not unnecessarily burdened with coarse material.
- the static sifter is connected directly to the side of the dynamic sifter, wherein the static sifter, in terms of process engineering, fulfills both the task of specimen agglomeration and of a first coarse separation.
- the static sifter and the dynamic sifter are consequently brought together close to each other, so that both sifters work energetically very efficiently and the static sifter can fulfill the task of sludge deagglomeration.
- the classifier of the static classifier opens in a tangential or spiral orientation into the classifier housing of the dynamic classifier.
- the sifter housing of the static sifter is always compactly connected laterally to the sifter housing of the dynamic sifter so that the static sifter housing merges into the dynamic sifter housing.
- the Sifter according to the invention thus has housing areas which can be assigned to both the static classifier and the dynamic classifier as a transition between the static classifier and the dynamic classifier.
- the classifier housing of the dynamic classifier has an upper housing portion in which the rotating rod basket is arranged, and has a lower housing portion, in which z. B.
- a failure funnel is arranged for the middle goods, wherein the static separator is connected with its housing to the lower housing portion of the dynamic classifier and merges into this lower housing portion.
- This lower housing section of the dynamic sifter thus forms the transitional area between static sifter and dynamic sifter.
- the housing of the dynamic classifier may preferably be cylindrical, so that the upper housing portion and / or the lower housing portion may be cylindrical.
- the lower housing section of the dynamic classifier then also has the function of a cyclone, which can influence both the function of the static classifier and the function of the dynamic classifier. Thus, this cyclone formed by the lower housing section can influence the effect of the static vision level.
- this cyclone can also be regarded as part of the dynamic classifier, since it forms a inflow channel for the vertical admission of the staff basket and because the failure separator of the dynamic classifier can also be arranged within this housing portion or cyclone.
- the static classifier and the dynamic classifier are spatially and also functionally closely connected.
- the static sifter is preferably connected to the lower housing section of the dynamic sifter. Then the static sifter (in a side view) is usually positioned below the bar basket. Alternatively, however, it is within the scope of the invention to arrange the static classifier or the static classifier at the same height or at least in some areas at the same height as the rotating rod basket.
- the slide deagglomeration is realized with the help of integrated impact and guide fixtures in the static classifier.
- the baffle and Leiteinbauten can be formed in a conventional manner of mutually inclined baffles or baffles. In a preferred embodiment, these plates or sheets are adjustable in their inclination, z. B. pivotable about a horizontal axis or rotatable. Since the operation of the static classifier during operation - in contrast to a dynamic classifier - is influenced only limited, such adjustment is appropriate. It can be set the desired conditions of the static classifier, so that in particular the flow conditions can be optimized.
- the baffles and Leiteinbauten can also be formed by roof-like installations, as z. B. from the DE 1 002 600 are known.
- the roof-like installations can optionally be displaced in the horizontal direction.
- the task of the sheet deagglomeration on the one hand and a first coarse material separation on the other hand are always combined with one another.
- the static classifier housing of the dynamic classifier is generally cylindrical or at least partially cylindrical
- the static classifier has a bay-like or box-like housing, which is preferably oriented obliquely to the vertical, so that also arranged inside the baffle and Leiteinbauten are arranged along a slope.
- the shaft-like housing has on the one hand the material inlet or Material entries for the good to be seen and on the other hand, at least one submitgaseinlass on which z. B. Air is supplied.
- the shaft-like housing having a (lower) shaft wall, which at a predetermined angle ⁇ between 10 ° and 80 °, z. B. 40 ° to 60 ° oriented.
- the housing can thus be arranged (in the side view) as a whole obliquely to the vertical.
- the invention also includes a shaft-like housing, which is not aligned obliquely to the vertical, but parallel to the vertical.
- the preparegaseintritt can z. B. are formed by at least one obliquely above the internals arranged inlet opening.
- the sight gas inlet is formed by one or more openings arranged in the shaft wall.
- These openings can z. B. be closed by flaps, so that can be varied by opening and closing the view gas supply. It is therefore within the scope of the invention that either an (upper) inlet opening of the type described is provided or that openings are provided in the shaft wall.
- a combination of these measures is realized, so that then both at least one obliquely arranged above the internals inlet opening and one or more arranged in the shaft wall openings are provided, said openings optionally z. B.
- Flaps means in the context of the invention generally means for opening and closing the openings and in particular for adjusting the air passage rate. By means of suitable air volume control it is possible to further increase the visual efficiency.
- the sight gas inlet is formed by a region of the sifter housing which is free of the chute wall. In this embodiment, can be dispensed with the shaft wall, so that then worked with open flow.
- the direction of rotation of the bar basket can be oriented with or against the tangential or spiral connection direction of the static separator housing.
- the dynamic sifter is particularly preferred in the upper part, z. B. provided in the upper housing section with one or more other material entries. This is particularly useful when the sifter is integrated into a multi-stage grinding plant, because then the ground good of a second stage can be fed to this sighting over this (second) material inlet. It may be z. B. to the Austragsgut a second crushing device, for. B. a ball mill act.
- the integration of the classifier in a single or multi-stage grinding plant will be explained in more detail below.
- two or more static classifiers, each with a classifier housing, are preferably connected to the dynamic classifier, in particular in the case of large units.
- the precaution for prospecting a coarse material fraction and for deagglomerating the scoop can consequently be carried out in parallel in several stages of precaution, in which case the individual precautionary steps are applied in parallel to the same dynamic classifier.
- the connection of the plurality of static classifier takes place (in plan view) preferably symmetrical. So it is within the scope of the invention that the plurality of static classifier over the circumference "symmetrical" and therefore arranged equidistantly.
- the offset is in relation to the circumference 360 ° / n, where "n" means the number of static classifier. Consequently, if two static classifiers are used, they are preferably connected in plan view at an angle of 180 ° to the dynamic classifier. If three static classifiers are used, these are preferably offset by an angle of about 120 °, and if four static classifiers are used, they are preferably offset by an angle of 90 °, and so on.
- baffles In addition to the static sifter already provided baffle and Leitinstallations, it may be appropriate to provide in the area of the dynamic classifier baffles, z. B. within the classifier housing of the dynamic classifier, preferably in the lower housing portion, which can take over the function of a cyclone for the reasons explained.
- the classifier housing of the dynamic classifier is provided with one or more additional air supply lines, which take over the function of an air bypass. It is then not only the air supply via the air inlet of the static classifier, but on the dynamic classifier additional air can be supplied. This then leads to the fact that the air supply is reduced in the range of the static classifier, so that in this way an optimized adjustment of the air duct is feasible.
- This additional air supply can, for. B. be realized in the upper housing portion of the classifier housing of the dynamic classifier.
- additional air distribution devices eg. B. perforated plates o. The like.
- B. perforated plates o. The like.
- the separator device according to the invention can be used for the sifting of granular materials of various kinds, in particular for the screening of cement, cement raw materials, limestone and similar materials. Alternatively, however, the invention also includes the screening of ores or the like. The natural resources of such raw materials are sometimes largely exploited, so that the extraction moves into hard to reach regions without sufficient water resources. There, the separator according to the invention can be used particularly efficiently.
- a multi-level, z. B. two-stage grinding system can be realized, in which in addition to the separator according to the invention, a further, separate separator is provided.
- the middle fraction of the described first classifier according to the invention in turn, a second crushing device, for. B. supplied to a ball mill.
- the Austragsmaterial this ball mill is then not - as described above - again the first classifier, but the second, separate classifier supplied with the emerging from this second classifier coarse material is again fed to the ball mill, while emerging from the second classifier fines as turn Product can be removed.
- single-stage grinding plants are also included, in which both the coarse material emerging from the sighting device according to the invention and the middle product of a first (single) comminution device, e.g. B. roller press, is fed and wherein the material emerging from this crushing material in turn enters via the material inlet into the viewing device according to the invention.
- a single-stage Kreislaufmahlstrom is realized.
- the in the Fig. 1 to 5 shown viewing device 1 is used for sifting granular material, eg. As cement, in at least three fractions.
- the device 1 is composed of a static classifier 2 and a dynamic classifier 3, which are combined in a particularly compact manner.
- the static separator 2 forms a first viewing stage
- the dynamic classifier 3 arranged downstream of the static classifier 2 in the direction of the visual medium flow forms a second visual stage.
- the static classifier 2 has a classifier housing 4 with the first material inlet 5, the classifying gas inlet 6 and the coarse material outlet 7. Within the classifier housing 4 are several, stair-like arranged with each other baffle and Leiteinbauten 8, 9 are arranged. In the exemplary embodiment, these fixtures are designed as baffles 8, 9, which also take over the function of baffles for the static separator. In Fig. 1 It can be seen that there are two groups of mutually inclined baffle plates 8, 9, wherein these baffles 8, 9 about pivot axes 10 are adjustable, so that the inclination of the baffles 8, 9 is adjustable.
- the second viewing stage is formed by the dynamic classifier 3, which has a classifier housing 11.
- This cylindrical classifier housing 11 has an upper (cylindrical) portion 11a and a lower (cylindrical) portion 11b.
- a rotating rod basket 12 is arranged, which surrounds a set of vanes 13. These are stationary vanes, which are arranged at a fixed or adjustable angle of attack to the axis of rotation of the bar basket.
- the rod basket 12 rotates about a vertical axis 14.
- a drive 15 is connected to the rod basket 12.
- a failure cone 16 is connected within the second classifier housing 11, which in turn is connected to the middle goods outlet 17.
- To the upper part 11a of the classifier housing 11 of the fine material outlet 18 is connected, via which the gas-fine material mixture is discharged. Furthermore, further material inlets 19 are connected to the upper housing part 11a.
- the starting material to be viewed is fed to the sighting device 1 via the first material inlet 5. About this passes the goods to be sighted consequently in the first viewing stage and consequently in the static classifier 2.
- the classifying gas for. B. supplied air. It may be z. B. also act hot drying gases.
- the material to be sighted now falls on the system of baffle and baffle plates 8, 9, in particular for deagglomeration the slugs and agglomerates produced during grinding in a roller press come. In this case, the material is flowed through by the viewing medium with possible, simultaneous drying.
- the static separator operates as a cross-flow air classifier, so that the coarse material falls through the housing 2 in the lower failure cone 20 and is discharged from there via the coarse material discharge 7.
- This failure cone 20 is structurally connected to the lower part 11b of the classifier housing 11 of the dynamic classifier 3.
- the static sifter and the dynamic sifter are interconnected in a very compact manner so that the static sifter 2 merges into the dynamic sifter 3.
- For the static classifier is connected with its classifier 4 side of the sifter housing 11 of the dynamic classifier.
- the classifier housing 4 of the static classifier 2 merges into the lower housing portion 11b of the classifier housing 11 so that the housing portion 11b of the classifier housing 11 can be functionally assigned in regions to the static classifier and the dynamic classifier, respectively. It establishes the connection between the static classifier and the dynamic classifier, with the cylindrical lower housing portion 11b also fulfilling the function of a cyclone.
- the fraction selected from the static sifter 2, together with the classifying gas enters the dynamic sifter 3, namely the upper area 11a of the sifter housing 11 and there into the area of the wire basket 12. Between this rotating bar basket 12 and the conductor blades 13 it occurs the desired fine sighting.
- the "coarser” or middle portions reach via the inner failure funnel or failure cone 16 to the failure tube and thus Wegschreibsch 17 ("Gr manausfallrohr”).
- This middle fraction is also called “grits”.
- the fines will be together with the gases discharged through the fines and gas outlet 18 from the classifier.
- About the additional material inlets 19 can be further material directly to the second stage of view perform. It may be z. B. to act, which consists of an additional crushing device, for. B. is fed to a ball mill. This is related to the Fig. 6 discussed in more detail.
- FIGS. 2 and 3 show now that the static separator 2 according to the invention with a shaft-like and obliquely arranged to the vertical first classifier housing 4 is connected directly to the second classifier housing 11 of the dynamic classifier 3, in embodiment in tangential or spiral orientation.
- Fig. 2 shows an embodiment with a spiral connection
- Fig. 3 an embodiment with tangential connection shows.
- the in the 4 and 5 illustrated embodiment substantially corresponds to the embodiment according to Fig. 1 and 3 , It differs geometrically in particular by the arrangement and design of the outlet funnel 16 of the dynamic classifier, which in the embodiment of the 4 and 5 over the entire height of the lower portion 11 b of Classifier housing 11 and also over the entire height of the classifier housing 4 of the static classifier 2 extends.
- the embodiments differ according to Fig. 1 to 3 on the one hand and 4 and 5 on the other hand in their geometric design, in particular in the area of the static classifier and its Leitinstallations.
- the basic structure and operation are identical.
- the shaft-like first classifier housing which is connected in a tangential or spiral orientation to the second classifier housing, is of particular importance.
- the figures show that this shaft-like first housing 4 or its (lower) shaft wall 21 is oriented at a PRE-enclosed angle ⁇ obliquely relative to the vertical.
- this angle ⁇ is about 40 ° to 60 °, z. B. about 50 °.
- the viewing zone of the static classifier formed between the baffle plates 8, 9 which are arranged in the manner of a staircase below one another is oriented at a certain angle ⁇ at an angle to the vertical.
- this angle ⁇ is about 20 ° to 40 °, z. B. 25 °.
- This overall obliquely oriented housing 4 is according to the invention connected spirally or tangentially to the housing of the dynamic classifier.
- FIGS. 1-10 show an embodiment in which the static classifier, although connected laterally to the dynamic classifier, but is positioned spatially below the rotating rod basket.
- the static classifier is arranged (at least in some areas) at the same height as the rotating rod basket. The same applies to embodiments with multiple static separators.
- the air supply takes place in particular via the illustrated reformgaseinstory 6.
- additional reformgaseinstorye be provided, which are formed in particular by arranged in the shaft wall 21 openings. This is not shown in the figures.
- Such openings may be made by suitable means, e.g. As valves, slides or the like to open and close, in particular by adjustable means a variable adjustment and thus air flow control is possible.
- baffle plates 8, 9 The arrangement of the baffle plates 8, 9 is shown in the figures only by way of example. It is indicated that the articulation points of the baffles 8, 9 need not lie on a common straight line, but may be arranged at a distance from each other. This one is especially in Fig. 4 indicated. However, it is alternatively also within the scope of the invention that the articulation points of the baffles or baffles (approximately) are arranged on a straight line or are also toothed and thus formed interlocking. However, they can also - as shown in the figures - be carried out at a distance between the articulation points, this distance at Fig. 4 is significantly larger than at Fig. 1 , The vertical distance between the individual plates need not be the same, but can vary from plate to plate. The plates can also be set at different angles.
- the multistage classifier 1 according to the invention can be particularly preferably integrated into a one-stage or multistage grinding plant, as exemplified in US Pat Fig. 6 is shown.
- a cement grinding plant is shown.
- the multi-level classifier 1 can be seen, which is composed of static classifier 2 and dynamic classifier 3.
- a first crushing device 22 in the embodiment is shown as a roller press, and thus a good bed roller mill 22.
- a second crushing device 23 in the embodiment is shown as a ball mill 23.
- the finest fraction is withdrawn from the sighting device, namely from the dynamic classifier 3 together with the gases through the fine material outlet 18 into the following separation cyclones 34. Here it is separated as a finished product of the gases, which are withdrawn with the fan 35 and partially fed back into the classifier 1 and partially or completely to a dedusting.
- the illustrated two-stage grinding plant can be modified in an alternative embodiment.
- the roller press 22 are placed in contrast to the arrangement shown above the classifying device 1.
- the fresh material to be ground is then first fed into the roll press, from which the pre-milled material is guided to the sifter device according to the invention. There, the material is again classified in the manner described in three fractions. This embodiment is not shown.
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- Combined Means For Separation Of Solids (AREA)
Description
Die Erfindung betrifft eine Vorrichtung zum Sichten von körnigem Gut in zumindest drei Fraktionen, mit zumindest einem eine erste Sichtstufe bildenden statischen Sichter und zumindest einem eine zweite Sichtstufe bildenden dynamischen Sichter,
wobei der statische Sichter in einem Sichtergehäuse mit zumindest einem ersten Materialeintritt, zumindest einem Sichtgaseinlass und zumindest einem Grobgutaustritt mehrere treppenartig untereinander angeordnete Prall- und Leiteinbauten aufweist,
wobei der dynamische Sichter als Stabkorbsichter mit rotierendem Stabkorb ausgebildet ist und ein zweites Sichtergehäuse mit zumindest einem Mittelgutaustritt und einem Feingutaustritt aufweist.The invention relates to an apparatus for sifting granular material into at least three fractions, with at least one static sifter forming a first sifting stage and at least one dynamic sifter forming a second sifting stage,
wherein the static sifter in a classifier housing having at least one first material inlet, at least one classifying gas inlet and at least one coarse material outlet has a plurality of impact-type and guide structures arranged in a staircase manner with one another,
wherein the dynamic classifier is designed as a rod basket classifier with a rotating rod basket and has a second classifier housing with at least one middle product outlet and a fine material outlet.
Bei dem zu sichtenden körnigen Gut kann es sich z. B. um Zement, zementhaltige Stoffe, Zementrohmaterial, Kalkstein oder Schlacke aber auch um Erze oder dergleichen handeln. Für die Zerkleinerung solcher körniger Materialien werden in der Praxis insbesondere Walzenpressen bzw. Gutbettwalzenmühlen eingesetzt. Bei dieser Hochdruckzerkleinerung des körnigen Mahlgutes wird dieses im Spalt zwischen zwei Presswalzen zerdrückt (Gutbettzerkleinerung). Im Zuge der Zerkleinerung kommt es zur Bildung von Agglomeraten, die als Schülpen bezeichnet werden. Derartige Gutbettwalzenmühlen können im geschlossenen Kreislauf mit statischem und/oder dynamischem Sichter betrieben werden. Die Gutbettwalzenmühle wird dann beispielsweise unterhalb eines Sichters positioniert, so dass die aus dem Sichter austretende Grobgutfraktion (erneut) der Walzenmühle zugeführt wird. Das aus der Walzenmühle austretende Material wird wiederum dem Materialeintritt der Sichtvorrichtung zugeführt, die sich als mehrstufige Vorrichtung aus einem statischen Sichter und einem dynamischen Sichter zusammensetzt. In dem statischen Sichter erfolgt über die Prall- und Leiteinbauten eine Desagglomeration der Schülpen, und zugleich wird die grobe Materialfraktion abgeschieden und der Walzenpresse zugeführt. Das "feinere" Gut gelangt mit den Sichtergasen in den dynamischen Sichter, wo es einer Feinsichtung unterzogen wird. Das aus diesem Sichter ausgesichtete Feingut wird zusammen mit dem Sichtgas abgeführt und in den folgenden Zyklonen und/oder Filter als Fertiggut aufgefangen. Die aus dem dynamischen Sichter ausgesichtete mittlere Fraktion kann z. B. ebenfalls erneut der Walzenpresse oder einer weiteren Mahlstufe zugeführt werden. Derartige Maßnahmen sind aus dem Stand der Technik bekannt (vgl. z. B.
Eine gattungsgemäße Sichtvorrichtung der eingangs beschriebenen Art kennt man z. B. aus der
Ebenfalls gattungsgemäß ist die Sichtvorrichtung der
Im Übrigen wurde vorgeschlagen, bei Windsichtern dachförmige Einbauten vorzusehen, die kaskadenförmig derart angeordnet werden, dass die Firstkante jedes Einbaus etwa lotrecht unterhalb der Abwurfkante der dem Windstrom zugekehrten Fläche des darüber hinaus angeordneten Einbaus liegt (vgl.
Aus der
Eine alternative Ausführungsform eines mehrstufigen Sichters mit kompakter Bauform ist aus der
Aus der
Schließlich ist aus der
Im Übrigen beschreibt die
Die bekannten Sichter der beschriebenen Art haben sich in der Praxis grundsätzlich bewährt, sie sind jedoch insbesondere hinsichtlich ihrer Sichteffizienz weiterentwicklungsfähig.The known classifiers of the type described have basically proven themselves in practice, but they are capable of further development, in particular with regard to their visual efficiency.
Der Erfindung liegt daher die Aufgabe zugrunde, eine Vorrichtung zum Sichten von körnigem Gut in zumindest drei Fraktionen der eingangs beschriebenen Art zu schaffen, welche sich nicht nur durch einen besonders kompakten Aufbau, sondern insbesondere auch durch geringe Investitions- und Betriebskosten und höhere Sichteffizienz auszeichnet. Insbesondere soll eine solche Sichtereinrichtung einen wirtschaftlichen Betrieb einer Mahlanlage mit zumindest einer Walzenpresse bei hoher Sichteffizienz ermöglichen.The invention is therefore an object of the invention to provide a device for sifting granular material in at least three fractions of the type described above, which is characterized not only by a particularly compact design, but in particular by low investment and operating costs and higher visual efficiency. In particular, such a sifting device should enable economical operation of a grinding plant with at least one roller press with high visual efficiency.
Zur Lösung dieser Aufgabe stellt die Erfindung eine Vorrichtung zum Sichten von körnigem Gut in zumindest drei Fraktionen zur Verfügung, welche die Merkmale des Anspruchs 1 aufweist.To achieve this object, the invention provides a device for sifting granular material in at least three fractions, which has the features of
Die Erfindung geht dabei zunächst einmal von der grundsätzlich bekannten Erkenntnis aus, dass es vorteilhaft ist, einen statischen Sichter und einen dynamischen Sichter in der Ausführungsform als Stabkorbsichter miteinander zu kombinieren, da über den statischen Sichter eine erste Grobgutfraktion ausgesichtet werden kann, so dass der dynamische Sichter mit den verhältnismäßig empfindlichen rotierenden Komponenten nicht unnötig mit Grobgut belastet wird. Erfindungsgemäß werden der statische und der dynamische Sichter in besonders effizienter und kompakter Bauform zusammengefasst, indem zum einen ein Stabkorb mit vertikaler Drehachse zum Einsatz kommt und zum anderen der statische Sichter direkt seitlich an den dynamischen Sichter angeschlossen ist, wobei der statische Sichter verfahrenstechnisch sowohl die Aufgabe der Schülpendesagglomeration als auch einer ersten Grobabscheidung erfüllt. Statischer Sichter und dynamischer Sichter werden folglich räumlich dicht zusammengebracht, so dass beide Sichter energetisch besonders effizient arbeiten, und der statische Sichter zugleich die Aufgabe der Schülpendesagglomeration erfüllen kann.The invention is initially based on the principle known knowledge that it is advantageous to combine a static sifter and a dynamic sifter in the embodiment as Stabkorbsichter with each other, as on the static sifter, a first coarse material fraction can be viewed, so that the dynamic Classifier with the relatively sensitive rotating components is not unnecessarily burdened with coarse material. According to the static and the dynamic classifier in a particularly efficient and compact design summarized by a rod basket with a vertical axis of rotation is used for a and on the other hand, the static sifter is connected directly to the side of the dynamic sifter, wherein the static sifter, in terms of process engineering, fulfills both the task of specimen agglomeration and of a first coarse separation. The static sifter and the dynamic sifter are consequently brought together close to each other, so that both sifters work energetically very efficiently and the static sifter can fulfill the task of sludge deagglomeration.
In Kombination mit dem erfindungsgemäßen Anschluss des statischen Sichters an den dynamischen Sichter kommt dem Einsatz des um eine vertikale Achse rotierenden Stabkorbsichters besondere Bedeutung zu. Denn diese Ausgestaltung mit "vertikalem" Stabkorbsichter zeichnet sich durch eine gleichmäßige Anströmung des Stabkorbes bzw. Rotors und damit durch verbesserte Sichteffizienz aus. Die beim Stand der Technik mit "horizontal" angeordneten Stabkorbachsen auftretenden Probleme werden im Rahmen der Erfindung vermieden, so dass insgesamt eine verbesserte Sichteffizienz realisiert wird.In combination with the connection according to the invention of the static classifier to the dynamic classifier, the use of the rod basket classifier rotating about a vertical axis is of particular importance. Because this configuration with "vertical" rod basket sifter is characterized by a uniform flow of the rod basket or rotor and thus by improved visual efficiency. The problems occurring in the prior art with "horizontal" arranged rod basket axes problems are avoided in the invention, so that an overall improved visual efficiency is realized.
Erfindungsgemäß mündet das Sichtergehäuse des statischen Sichters in tangentialer oder spiralförmiger Orientierung in das Sichtergehäuse des dynamischen Sichters. Jedenfalls ist das Sichtergehäuse des statischen Sichters stets kompakt seitlich an das Sichtergehäuse des dynamischen Sichters angeschlossen, so dass das statische Sichtergehäuse in das dynamische Sichtergehäuse übergeht. Der erfindungsgemäße Sichter weist folglich Gehäusebereiche auf, die als Übergang zwischen statischem Sichter und dynamischem Sichter sowohl dem statischen Sichter als auch dem dynamischen Sichter zugeordnet werden können. So ist weiterhin vorgesehen, dass das Sichtergehäuse des dynamischen Sichters einen oberen Gehäuseabschnitt aufweist, in dem der rotierende Stabkorb angeordnet ist, und einen unteren Gehäuseabschnitt aufweist, in dem z. B. ein Ausfalltrichter für das Mittelgut angeordnet ist, wobei der statische Sichter mit seinem Gehäuse an den unteren Gehäuseabschnitt des dynamischen Sichters angeschlossen ist und in diesen unteren Gehäuseabschnitt übergeht. Dieser untere Gehäuseabschnitt des dynamischen Sichters bildet folglich den Übergangsbereich zwischen statischem Sichter und dynamischen Sichter. Das Gehäuse des dynamischen Sichters kann vorzugsweise zylindrisch ausgebildet sein, so dass der obere Gehäuseabschnitt und/oder der untere Gehäuseabschnitt zylindrisch ausgebildet sein können. Dem unteren Gehäuseabschnitt des dynamischen Sichters kommt dann auch die Funktion eines Zyklons zu, der sowohl die Funktion des statischen Sichters als auch die Funktion des dynamischen Sichters beeinflussen kann. So kann dieser von dem unteren Gehäuseabschnitt gebildete Zyklon die Wirkung der statischen Sichtstufe beeinflussen. Gleichzeitig kann man diesen Zyklon aber auch als Teil des dynamischen Sichters betrachten, da er einen Anströmkanal für die senkrechte Beaufschlagung des Stabkorbes bildet und da innerhalb dieses Gehäuseabschnittes bzw. Zyklons auch der Ausfalltrichter des dynamischen Sichters angeordnet sein kann. Auch dadurch wird deutlich, dass erfindungsgemäß der statische Sichter und der dynamische Sichter räumlich und auch funktionell eng miteinander verbunden werden.According to the invention, the classifier of the static classifier opens in a tangential or spiral orientation into the classifier housing of the dynamic classifier. In any case, the sifter housing of the static sifter is always compactly connected laterally to the sifter housing of the dynamic sifter so that the static sifter housing merges into the dynamic sifter housing. Of the Sifter according to the invention thus has housing areas which can be assigned to both the static classifier and the dynamic classifier as a transition between the static classifier and the dynamic classifier. Thus, it is further provided that the classifier housing of the dynamic classifier has an upper housing portion in which the rotating rod basket is arranged, and has a lower housing portion, in which z. B. a failure funnel is arranged for the middle goods, wherein the static separator is connected with its housing to the lower housing portion of the dynamic classifier and merges into this lower housing portion. This lower housing section of the dynamic sifter thus forms the transitional area between static sifter and dynamic sifter. The housing of the dynamic classifier may preferably be cylindrical, so that the upper housing portion and / or the lower housing portion may be cylindrical. The lower housing section of the dynamic classifier then also has the function of a cyclone, which can influence both the function of the static classifier and the function of the dynamic classifier. Thus, this cyclone formed by the lower housing section can influence the effect of the static vision level. At the same time, however, this cyclone can also be regarded as part of the dynamic classifier, since it forms a inflow channel for the vertical admission of the staff basket and because the failure separator of the dynamic classifier can also be arranged within this housing portion or cyclone. This also makes it clear that according to the invention, the static classifier and the dynamic classifier are spatially and also functionally closely connected.
Wie beschrieben ist der statische Sichter bevorzugt an den unteren Gehäuseabschnitt des dynamischen Sichters angeschlossen. Dann ist der statische Sichter (in einer Seitenansicht) in der Regel unterhalb des Stabkorbes positioniert. Alternativ liegt es jedoch im Rahmen der Erfindung, den statischen Sichter bzw. die statischen Sichter auf gleicher Höhe oder zumindest bereichsweise auf gleicher Höhe mit dem rotierenden Stabkorb anzuordnen.As described, the static sifter is preferably connected to the lower housing section of the dynamic sifter. Then the static sifter (in a side view) is usually positioned below the bar basket. Alternatively, however, it is within the scope of the invention to arrange the static classifier or the static classifier at the same height or at least in some areas at the same height as the rotating rod basket.
Innerhalb des statischen Sichters kommt es nicht nur zu einer ersten Trennung von Grobgut und Mittelgut, sondern es kann auch eine Schülpendesagglomeration erfolgen. Die Schülpendesagglomeration wird mit Hilfe der in den statischen Sichter integrierten Prall- und Leiteinbauten realisiert. Die Prall- und Leiteinbauten können in an sich bekannter Weise von gegeneinander geneigten Prallplatten bzw. Leitblechen gebildet werden. In bevorzugter Ausführungsform sind diese Platten bzw. Bleche in ihrer Neigung einstellbar, z. B. um eine horizontale Achse verschwenk- bzw. drehbar. Da die Funktionsweise des statischen Sichters während des Betriebes - im Gegensatz zu einem dynamischen Sichter - nur begrenzt beeinflussbar ist, ist eine solche Einstellmöglichkeit zweckmäßig. Es können die gewünschten Gegebenheiten des statischen Sichters eingestellt werden, so dass insbesondere die Strömungsverhältnisse optimierbar sind. Alternativ können die Prall- und Leiteinbauten auch von dachartigen Einbauten gebildet werden, wie sie z. B. aus der
Während das (zweite) Sichtergehäuse des dynamischen Sichters in der Regel zylindrisch oder zumindest bereichsweise zylindrisch ausgebildet ist, weist der statische Sichter ein schachtartiges bzw. kastenartiges Gehäuse auf, das bevorzugt schräg zur Vertikalen ausgerichtet ist, so dass auch die im Innern angeordneten Prall- und Leiteinbauten entlang einer Schrägen angeordnet sind. Das schachtartige Gehäuse weist zum einen den Materialeintritt oder die Materialeintritte für das zu sichtende Gut und zum anderen zumindest einen Sichtgaseinlass auf, über welchen z. B. Luft zugeführt wird. Dazu kann das schachtartige Gehäuse eine (untere) Schachtwand aufweisen, welche unter einem vorgegebenen Winkel α zwischen 10° und 80°, z. B. 40° bis 60° orientiert ist. Das Gehäuse kann folglich (in der Seitenansicht) insgesamt schräg zur Vertikalen angeordnet sein. Gleiches gilt für die innerhalb des Gehäuses treppenartig untereinander angeordneten Prall- und Leiteinbauten. Zwischen diesen wird die Sichtzone der ersten Sichtstufe gebildet, welche unter einem vorgegebenen Winkel β zwischen 20° und 70°, z. B. 20° bis 40° bezogen auf die Vertikale orientiert ist. Die Erfindung umfasst aber auch ein schachtartiges Gehäuse, welches nicht schräg zur Vertikalen ausgerichtet ist, sondern parallel zur Vertikalen.While the (second) classifier housing of the dynamic classifier is generally cylindrical or at least partially cylindrical, the static classifier has a bay-like or box-like housing, which is preferably oriented obliquely to the vertical, so that also arranged inside the baffle and Leiteinbauten are arranged along a slope. The shaft-like housing has on the one hand the material inlet or Material entries for the good to be seen and on the other hand, at least one Sichtgaseinlass on which z. B. Air is supplied. For this purpose, the shaft-like housing having a (lower) shaft wall, which at a predetermined angle α between 10 ° and 80 °, z. B. 40 ° to 60 ° oriented. The housing can thus be arranged (in the side view) as a whole obliquely to the vertical. The same applies to the inside of the housing staircase with each other arranged baffles and Leiteinbauten. Between these, the viewing zone of the first vision stage is formed, which at a predetermined angle β between 20 ° and 70 °, z. B. 20 ° to 40 ° oriented relative to the vertical. However, the invention also includes a shaft-like housing, which is not aligned obliquely to the vertical, but parallel to the vertical.
Der Sichtgaseintritt kann z. B. von zumindest einer schräg oberhalb der Einbauten angeordneten Eintrittsöffnung gebildet werden. Alternativ oder ergänzend besteht die Möglichkeit, dass der Sichtgaseintritt von einer oder mehreren in der Schachtwand angeordneten Öffnungen gebildet wird. Diese Öffnungen können z. B. durch Klappen verschließbar sein, so dass durch Öffnen und Schließen die Sichtgaszuführung variiert werden kann. Es liegt folglich im Rahmen der Erfindung, dass entweder eine (obere) Eintrittsöffnung der beschriebenen Art vorgesehen ist oder dass Öffnungen in der Schachtwand vorgesehen sind. Bevorzugt wird jedoch eine Kombination dieser Maßnahmen realisiert, so dass dann sowohl zumindest eine schräg oberhalb der Einbauten angeordnete Eintrittsöffnung als auch eine oder mehrere in der Schachtwand angeordnete Öffnungen vorgesehen sind, wobei diese Öffnungen optional z. B. durch Klappen verschließbar sind. Es besteht dann die Möglichkeit mit "variabler" Luftzufuhr und folglich einer Luftmengenregelung zu arbeiten. Dabei ist es zweckmäßig, wenn die einzelnen Klappen einzeln, in Gruppen und/oder gemeinsam zu öffnen und zu schließen sind, wobei besonders bevorzugt durch die Einstellung der Öffnungen eine variable und gezielte Anpassung möglich wird. Klappen meint dabei im Rahmen der Erfindung allgemein Mittel zum Öffnen und Schließen der Öffnungen und insbesondere zum Einstellen der Luftdurchtrittsmenge. Durch geeignete Luftmengenregelung besteht die Möglichkeit, die Sichteffizienz weiter zu steigern.The Sichtgaseintritt can z. B. are formed by at least one obliquely above the internals arranged inlet opening. Alternatively or additionally, there is the possibility that the sight gas inlet is formed by one or more openings arranged in the shaft wall. These openings can z. B. be closed by flaps, so that can be varied by opening and closing the view gas supply. It is therefore within the scope of the invention that either an (upper) inlet opening of the type described is provided or that openings are provided in the shaft wall. Preferably, however, a combination of these measures is realized, so that then both at least one obliquely arranged above the internals inlet opening and one or more arranged in the shaft wall openings are provided, said openings optionally z. B. are closed by flaps. It is then possible to work with "variable" air supply and consequently an air flow control. It is expedient if the individual flaps individually, in groups and / or to open and close together, being particularly preferred by the adjustment of the openings a variable and targeted adjustment is possible. Flaps means in the context of the invention generally means for opening and closing the openings and in particular for adjusting the air passage rate. By means of suitable air volume control it is possible to further increase the visual efficiency.
Weiter besteht optional oder ergänzend die Möglichkeit, dass der Sichtgaseintritt von einem schachtwandfreien Bereich des Sichtergehäuses gebildet wird. Bei dieser Ausführungsform kann auf die Schachtwand verzichtet werden, so dass dann mit offener Anströmung gearbeitet wird.Furthermore, optionally or additionally, there is the possibility that the sight gas inlet is formed by a region of the sifter housing which is free of the chute wall. In this embodiment, can be dispensed with the shaft wall, so that then worked with open flow.
Von besonderer Bedeutung ist im Rahmen der Erfindung die Kombination des seitlich, z. B. tangential- oder spiralförmig angeschlossenen ersten Sichtergehäuses mit dem in vertikaler Orientierung angeordneten Stabkorb. Die Drehrichtung des Stabkorbes kann mit oder entgegen der tangentialen bzw. spiralartigen Anschlussrichtung des statischen Sichtergehäuses orientiert sein.Of particular importance in the context of the invention, the combination of the side, z. B. tangentially or spirally connected first classifier housing with the arranged in a vertical orientation rod basket. The direction of rotation of the bar basket can be oriented with or against the tangential or spiral connection direction of the static separator housing.
Der dynamische Sichter ist besonders bevorzugt im oberen Teil, z. B. im oberen Gehäuseabschnitt mit einem oder mehreren weiteren Materialeintritten versehen. Dieses ist insbesondere dann zweckmäßig, wenn der Sichter in eine mehrstufige Mahlanlage integriert wird, weil dann über diesen (zweiten) Materialeintritt das gemahlene Gut einer zweiten Stufe zur Sichtung zugeführt werden kann. Dabei kann es sich z. B. um das Austragsgut einer zweiten Zerkleinerungsvorrichtung, z. B. einer Kugelmühle, handeln. Die Einbindung der Sichtereinrichtung in eine ein- oder mehrstufige Mahlanlage wird im Folgenden noch näher erläutert.The dynamic sifter is particularly preferred in the upper part, z. B. provided in the upper housing section with one or more other material entries. This is particularly useful when the sifter is integrated into a multi-stage grinding plant, because then the ground good of a second stage can be fed to this sighting over this (second) material inlet. It may be z. B. to the Austragsgut a second crushing device, for. B. a ball mill act. The integration of the classifier in a single or multi-stage grinding plant will be explained in more detail below.
Es liegt grundsätzlich im Rahmen der Erfindung, dass ein einzelner statischer Sichter in der erfindungsgemäßen, z. B. tangentialen bzw. spiralförmigen, Art an den dynamischen Sichter angeschlossen ist. Bevorzugt sind jedoch, insbesondere bei großen Einheiten, zwei oder auch mehrere statische Sichter mit jeweils einem Sichtergehäuse an den dynamischen Sichter angeschlossen. Die Vorsichtung zum Aussichten einer Grobgutfraktion und zum Desagglomerieren der Schülpe kann folglich parallel in mehreren Vorsichtsstufen durchgeführt werden, wobei dann die einzelnen Vorsichtstufen parallel ein- und denselben dynamischen Sichter beaufschlagen. Der Anschluss der mehreren statischen Sichter erfolgt dabei (in der Draufsicht) vorzugsweise symmetrisch. So liegt es im Rahmen der Erfindung, dass die mehreren statischen Sichter über den Umfang "symmetrisch" und folglich äquidistant angeordnet werden. Der Versatz beträgt dabei bezogen auf den Umfang 360°/n, wobei mit "n" die Anzahl der statischen Sichter gemeint ist. Werden folglich zwei statische Sichter verwendet, so sind diese in der Draufsicht bevorzugt um einen Winkel von 180° versetzt an den dynamischen Sichter angeschlossen. Werden drei statische Sichter verwendet, so sind diese bevorzugt um einen Winkel von etwa 120° versetzt angeordnet, und werden vier statische Sichter verwendet, so sind diese bevorzugt um einen Winkel von 90° versetzt zueinander angeordnet, usw..It is basically within the scope of the invention that a single static separator in the inventive, z. B. tangential or spiral, Art connected to the dynamic classifier. However, two or more static classifiers, each with a classifier housing, are preferably connected to the dynamic classifier, in particular in the case of large units. The precaution for prospecting a coarse material fraction and for deagglomerating the scoop can consequently be carried out in parallel in several stages of precaution, in which case the individual precautionary steps are applied in parallel to the same dynamic classifier. The connection of the plurality of static classifier takes place (in plan view) preferably symmetrical. So it is within the scope of the invention that the plurality of static classifier over the circumference "symmetrical" and therefore arranged equidistantly. The offset is in relation to the circumference 360 ° / n, where "n" means the number of static classifier. Consequently, if two static classifiers are used, they are preferably connected in plan view at an angle of 180 ° to the dynamic classifier. If three static classifiers are used, these are preferably offset by an angle of about 120 °, and if four static classifiers are used, they are preferably offset by an angle of 90 °, and so on.
Zusätzlich zu den im statischen Sichter ohnehin vorgesehenen Prall- und Leiteinbauten kann es zweckmäßig sein, auch im Bereich des dynamischen Sichters Pralleinbauten vorzusehen, z. B. innerhalb des Sichtergehäuses des dynamischen Sichters, vorzugsweise in dessen unterem Gehäuseabschnitt, welcher aus den erläuterten Gründen die Funktion eines Zyklons übernehmen kann. An die Gehäusewand dieses Zyklons können innenseitig Pralleinbauten angeschlossen werden, welche als "Stolperkanten" oder "Abschälkanten" funktionieren können. Sie sollen der Zyklonwirkung dieses Teils des Sichters entgegenwirken und diese Zyklonwirkung folglich reduzieren. Denn mit Hilfe dieser wandseitig angeordneten Einbauten kann das sich im Wandbereich sammelnde Material wieder in Richtung Zentrum bzw. Achse gebracht werden, so dass die Sichtfunktion optimiert wird.In addition to the static sifter already provided baffle and Leitinstallations, it may be appropriate to provide in the area of the dynamic classifier baffles, z. B. within the classifier housing of the dynamic classifier, preferably in the lower housing portion, which can take over the function of a cyclone for the reasons explained. On the housing wall of this cyclone inside baffles can be connected, which can function as "stumbling edges" or "peeling edges". They should counteract the cyclone effect of this part of the classifier and thus reduce this cyclone effect. Because with the help of this wall-mounted internals that can be collected in the wall area Material be brought back towards the center or axis, so that the visual function is optimized.
Nach einem weiteren Vorschlag ist optional vorgesehen, dass das Sichtergehäuse des dynamischen Sichters mit einer oder mehreren zusätzlichen Luftzuführungen versehen ist, die die Funktion eines Luftbypasses übernehmen. Es erfolgt dann nicht nur die Luftzuführung über den Lufteintritt des statischen Sichters, sondern über den dynamischen Sichter kann zusätzliche Luft zugeführt werden. Dieses führt dann dazu, dass die Luftzufuhr im Bereich des statischen Sichters verringert wird, so dass auf diese Weise eine optimierte Anpassung der Luftführung realisierbar ist. Diese zusätzliche Luftzuführung kann z. B. im oberen Gehäuseabschnitt des Sichtergehäuses des dynamischen Sichters realisiert werden.According to a further proposal, it is optionally provided that the classifier housing of the dynamic classifier is provided with one or more additional air supply lines, which take over the function of an air bypass. It is then not only the air supply via the air inlet of the static classifier, but on the dynamic classifier additional air can be supplied. This then leads to the fact that the air supply is reduced in the range of the static classifier, so that in this way an optimized adjustment of the air duct is feasible. This additional air supply can, for. B. be realized in the upper housing portion of the classifier housing of the dynamic classifier.
Schließlich liegt es im Rahmen der Erfindung, optional im Bereich des statischen Sichters zusätzliche Luftverteileinrichtungen, z. B. Lochbleche o. dgl., vorzusehen. Diese können in das Sichtergehäuse des statischen Sichters in Strömungsrichtung vor den Prall- und Leiteinbauten angeordnet werden. Sie führen zu einer besseren Luftverteilung über die gesamte Höhe des statischen Sichters.Finally, it is within the scope of the invention, optionally in the field of static classifier additional air distribution devices, eg. B. perforated plates o. The like., Provide. These can be arranged in the sifter housing of the static classifier in the flow direction in front of the baffles and Leitinstallations. They lead to a better air distribution over the entire height of the static classifier.
Die erfindungsgemäße Sichtereinrichtung lässt sich für das Sichten von körnigen Materialien unterschiedlichster Art einsetzen, insbesondere zum Sichten von Zement, Zementrohstoffen, Kalkstein und ähnlichen Stoffen. Alternativ umfasst die Erfindung aber auch das Sichten von Erzen oder dergleichen. Die natürlichen Vorräte solcher Rohstoffe sind zum Teil weitgehend ausgebeutet, so dass sich die Gewinnung in schwer zugängliche Regionen ohne ausreichende Wasservorräte verschiebt. Dort kann der erfindungsgemäße Sichter besonders effizient eingesetzt werden.The separator device according to the invention can be used for the sifting of granular materials of various kinds, in particular for the screening of cement, cement raw materials, limestone and similar materials. Alternatively, however, the invention also includes the screening of ores or the like. The natural resources of such raw materials are sometimes largely exploited, so that the extraction moves into hard to reach regions without sufficient water resources. There, the separator according to the invention can be used particularly efficiently.
Gegenstand der Erfindung ist auch eine einstufige (Kreislaufmahlanlage) oder mehrstufige Mahlanlage für die Zerkleinerung von körnigem Gut mit
- zumindest einer ersten Zerkleinerungsvorrichtung und
- zumindest einer Sichtereinrichtung der beschriebenen Art,
- at least a first crushing device and
- at least one sifting device of the type described,
Alternativ kann jedoch auch eine mehrstufige, z. B. zweistufige Mahlanlage realisiert werden, bei welcher zusätzlich zu dem erfindungsgemäßen Sichter ein weiterer, separater Sichter vorgesehen ist. Die mittlere Fraktion des beschriebenen erfindungsgemäßen ersten Sichters wird wiederum einer zweiten Zerkleinerungsvorrichtung, z. B. einer Kugelmühle zugeführt. Das Austragsmaterial dieser Kugelmühle wird dann jedoch nicht - wie zuvor beschrieben - wiederum dem ersten Sichter, sondern dem zweiten, separaten Sichter zugeführt, wobei das aus diesem zweiten Sichter austretende Grobgut nochmals der Kugelmühle zugeführt wird, während das aus dem zweiten Sichter austretende Feingut wiederum als Produkt abgeführt werden kann.Alternatively, however, a multi-level, z. B. two-stage grinding system can be realized, in which in addition to the separator according to the invention, a further, separate separator is provided. The middle fraction of the described first classifier according to the invention, in turn, a second crushing device, for. B. supplied to a ball mill. The Austragsmaterial this ball mill is then not - as described above - again the first classifier, but the second, separate classifier supplied with the emerging from this second classifier coarse material is again fed to the ball mill, while emerging from the second classifier fines as turn Product can be removed.
Schließlich werden erfindungsgemäß aber auch einstufige Mahlanlagen umfasst, bei denen sowohl das aus der erfindungsgemäßen Sichteinrichtung austretende Grobgut als auch das Mittelgut einer ersten (einzigen) Zerkleinerungsvorrichtung, z. B. Walzenpresse, zugeführt wird und wobei das aus dieser Zerkleinerungsvorrichtung austretende Material wiederum über den Materialeintritt in die erfindungsgemäße Sichtvorrichtung eintritt. Damit wird eine einstufige Kreislaufmahlanlage realisiert.Finally, according to the invention, however, single-stage grinding plants are also included, in which both the coarse material emerging from the sighting device according to the invention and the middle product of a first (single) comminution device, e.g. B. roller press, is fed and wherein the material emerging from this crushing material in turn enters via the material inlet into the viewing device according to the invention. Thus, a single-stage Kreislaufmahlanlage is realized.
Es liegt dabei im Rahmen der Erfindung, dass die erste Zerkleinerungsvorrichtung, z. B. Walzenpresse, oberhalb der Sichtereinrichtung angeordnet ist. Besonders bevorzugt ist die Walzenpresse jedoch unterhalb der Sichtereinrichtung positioniert. Im Folgenden wird die Erfindung anhand einer lediglich ein Ausführungsbeispiel darstellenden Zeichnung näher erläutert. Es zeigen:
- Fig. 1
- einen teilweisen Vertikalschnitt durch eine erfindungsgemäße Sichtereinrichtung in vereinfachter Darstellung,
- Fig. 2
- eine Draufsicht auf den unteren Teil des Gegenstandes nach
Fig. 1 in einer ersten Ausführungsform, - Fig. 3
- eine Draufsicht auf den unteren Teil des Gegenstandes nach
Fig. 1 in einer zweiten Ausführungsform, - Fig. 4
- eine abgewandelte Ausführungsform des Gegenstandes nach
Fig. 1 (Ausschnitt im Bereich des Unterteils), - Fig. 5
- eine Draufsicht auf den unteren Teil des Gegenstandes nach
Fig. 4 und - Fig. 6
- schematisch eine zweistufige Mahlanlage mit einer erfindungsgemäßen Sichtereinrichtung.
- Fig. 1
- a partial vertical section through a separator device according to the invention in a simplified representation,
- Fig. 2
- a plan view of the lower part of the object according to
Fig. 1 in a first embodiment, - Fig. 3
- a plan view of the lower part of the object according to
Fig. 1 in a second embodiment, - Fig. 4
- a modified embodiment of the article according to
Fig. 1 (Detail in the area of the lower part), - Fig . 5
- a plan view of the lower part of the object according to
Fig. 4 and - Fig. 6
- schematically a two-stage grinding plant with a classifying device according to the invention.
Die in den
Der statische Sichter 2 weist ein Sichtergehäuse 4 mit erstem Materialeintritt 5, Sichtgaseinlass 6 und Grobgutaustritt 7 auf. Innerhalb des Sichtergehäuses 4 sind mehrere, treppenartig untereinander angeordnete Prall- und Leiteinbauten 8, 9 angeordnet. Im Ausführungsbeispiel sind diese Einbauten als Prallplatten 8, 9 ausgebildet, die zugleich die Funktion von Leitblechen für den statischen Sichter übernehmen. In
Die zweite Sichtstufe wird von dem dynamischen Sichter 3 gebildet, der ein Sichtergehäuse 11 aufweist. Dieses zylindrische Sichtergehäuse 11 weist einen oberen (zylindrischen) Abschnitt 11a und einen unteren (zylindrischen) Abschnitt 11 b auf. Im oberen Teil 11 a dieses Sichtergehäuses 11 ist ein rotierender Stabkorb 12 angeordnet, den ein Satz von Leitschaufeln 13 umgibt. Dabei handelt es sich um stationäre Leitschaufeln, die unter einem festen oder auch einstellbaren Anstellwinkel zur Rotationsachse des Stabkorbes angeordnet sind. Der Stabkorb 12 rotiert um eine vertikale Achse 14. Dazu ist an dem Stabkorb 12 ein Antrieb 15 angeschlossen. Unterhalb des Stabkorbes 12 ist innerhalb des zweiten Sichtergehäuses 11 ein Ausfallkegel 16 angeschlossen, der wiederum an den Mittelgutaustritt 17 angeschlossen ist. An das Oberteil 11a des Sichtergehäuses 11 ist der Feingutaustritt 18 angeschlossen, wobei über diesen das Gas-Feingut-Gemisch abgeführt wird. Ferner sind an das Gehäuseoberteil 11a weitere Materialeintritte 19 angeschlossen.The second viewing stage is formed by the
Das zu sichtende Ausgangsmaterial wird der Sichtvorrichtung 1 über den ersten Materialeintritt 5 zugeführt. Über diesen gelangt das zu sichtende Gut folglich in die erste Sichtstufe und folglich in den statischen Sichter 2. Durch den Gaseintritt 3 wird das Sichtgas, z. B. Luft zugeführt. Dabei kann es sich z. B. auch heiße Trocknungsgase handeln. Das zu sichtende Material fällt nun auf das System von Prall- und Leitplatten 8, 9, wobei es insbesondere zur Desagglomeration der beim Mahlen in einer Walzenpresse entstandenen Schülpen und Agglomerate kommt. Dabei wird das Material von dem Sichtmedium bei möglicher, gleichzeitiger Trocknung durchströmt. Der statische Sichter arbeitet als Querstrom-Windsichter, so dass das Grobgut durch das Gehäuse 2 in den unteren Ausfallkegel 20 fällt und von dort über den Grobgutaustrag 7 ausgetragen wird. Dieser Ausfallkegel 20 ist baulich an den unteren Teils 11b des Sichtergehäuses 11 des dynamischen Sichters 3 angeschlossen.The starting material to be viewed is fed to the
Der statische Sichter und der dynamische Sichter sind in sehr kompakter Weise miteinander verbunden, so dass der statische Sichter 2 in den dynamischen Sichter 3 übergeht. Denn der statische Sichter ist mit seinem Sichtergehäuse 4 seitlich an das Sichtergehäuse 11 des dynamischen Sichters angeschlossen. Im Ausführungsbeispiel ist erkennbar, dass das Sichtergehäuse 4 des statischen Sichters 2 in den unteren Gehäuseabschnitt 11 b des Sichtergehäuses 11 übergeht, so dass der Gehäuseabschnitt 11 b des Sichtergehäuses 11 funktionell bereichsweise einerseits dem statischen Sichter und andererseits dem dynamischen Sichter zugeordnet werden kann. Er stellt die Verbindung zwischen dem statischen Sichter und dem dynamischen Sichter her, wobei der zylindrische untere Gehäuseabschnitt 11b auch die Funktion eines Zyklons erfüllt.The static sifter and the dynamic sifter are interconnected in a very compact manner so that the
Jedenfalls tritt die aus dem statischen Sichter 2 ausgesichtete Fraktion gemeinsam mit dem Sichtgas in den dynamischen Sichter 3, nämlich in den oberen Bereich 11a des Sichtergehäuses 11 und dort in den Bereich des Stabkorbes 12. Zwischen diesem rotierenden Stabkorb 12 und den Leiterschaufeln 13 kommt es zu der gewünschten Feinsichtung. Die "gröberen" bzw. mittleren Anteile gelangen über den inneren Ausfalltrichter bzw. Ausfallkegel 16 zu dem Ausfallrohr und folglich Mittelgutaustritt 17 ("Grießausfallrohr"). Diese mittlere Fraktion wird auch als "Grieße" bezeichnet. Das Feingut wird zusammen mit den Gasen durch den Feingut- und Gasaustritt 18 aus dem Sichter ausgetragen. Über die zusätzlichen Materialeintritte 19 lässt sich weiteres Material unmittelbar der zweiten Sichtstufe zuführen. Dabei kann es sich z. B. um Material handeln, welches aus einer zusätzlichen Zerkleinerungsvorrichtung, z. B. einer Kugelmühle zugeführt wird. Darauf wird im Zusammenhang mit der
Die
Dabei ist in den beiden Ausführungsbeispielen erkennbar, dass jeweils zwei statische Sichter 2 mit zwei Sichtergehäusen 4 an das Sichtergehäuse 11 des dynamischen Sichters 3 angeschlossen sind. Der dynamische Sichter 3 wird folglich parallel von zwei statischen Sichtern 2 beaufschlagt. Dazu sind die beiden statischen Sichter 2 im Ausführungsbeispiel um 180° versetzt positioniert. Die Drehrichtung des Stabkorbes, kann der Anschlussrichtung des tangentialen bzw. spiralförmigen Anschlusses entsprechen oder auch dieser entgegen ausgeführt sein.It can be seen in the two exemplary embodiments that in each case two
Die in den
Dem schachtartigen ersten Sichtergehäuse, welches in tangentialer oder spiralförmiger Orientierung an das zweite Sichtergehäuse angeschlossen ist, kommt besondere Bedeutung zu. Die Figuren zeigen dabei, dass dieses schachtartige erste Gehäuse 4 bzw. dessen (untere) Schachtwand 21 unter einem vorgege benen Winkel α schräg gegenüber der Vertikalen orientiert ist. Im Ausführungsbeispiel beträgt dieser Winkel α etwa 40° bis 60°, z. B. ca. 50°. Es ist im Übrigen erkennbar, dass auch die zwischen den treppenartig untereinander angeordneten Prallplatten 8, 9 gebildete Sichtzone des statischen Sichters unter einem bestimmten Winkel β schräg gegenüber der Vertikalen orientiert ist. Im Ausführungsbeispiel beträgt dieser Winkel β etwa 20° bis 40°, z. B. 25°. Dieses insgesamt schräg orientierte Gehäuse 4 ist erfindungsgemäß spiralförmig bzw. tangential an das Gehäuse des dynamischen Sichters angeschlossen.The shaft-like first classifier housing, which is connected in a tangential or spiral orientation to the second classifier housing, is of particular importance. The figures show that this shaft-like
Die Figuren zeigen dabei eine Ausführungsform, bei welcher der statische Sichter zwar seitlich an den dynamischen Sichter angeschlossen ist, jedoch räumlich unterhalb des rotierenden Stabkorbes positioniert ist. Optional können jedoch auch Ausführungsformen realisiert werden, bei denen der statische Sichter (zumindest bereichsweise) auf gleicher Höhe mit dem rotierenden Stabkorb angeordnet ist. Gleiches gilt für Ausführungsformen mit mehreren statischen Sichtern.The figures show an embodiment in which the static classifier, although connected laterally to the dynamic classifier, but is positioned spatially below the rotating rod basket. Optionally, however, embodiments can also be realized in which the static classifier is arranged (at least in some areas) at the same height as the rotating rod basket. The same applies to embodiments with multiple static separators.
Im Übrigen erfolgt bei den dargestellten Ausführungsformen die Luftzuführung insbesondere über den dargestellten Sichtgaseintritt 6. Alternativ oder ergänzend können zusätzliche Sichtgaseintritte vorgesehen sein, die insbesondere von in der Schachtwand 21 angeordneten Öffnungen gebildet werden. Dieses ist in den Figuren nicht dargestellt. Solche Öffnungen können durch geeignete Mittel, z. B. Klappen, Schieber oder dergleichen zu öffnen und zu schließen sein, wobei insbesondere durch einstellbare Mittel eine variable Anpassung und damit Luftmengenregelung möglich wird.Incidentally, in the illustrated embodiments, the air supply takes place in particular via the illustrated
Die Anordnung der Prallplatten 8, 9 ist in den Figuren lediglich beispielhaft dargestellt. Es ist angedeutet, dass die Anlenkpunkte der Prallplatten 8, 9 nicht auf einer gemeinsamen Geraden liegen müssen, sondern beabstandet voneinander angeordnet seien können. Dieser ist insbesondere in
Der erfindungsgemäße, mehrstufige Sichter 1 lässt sich besonders bevorzugt in eine einstufige oder mehrstufige Mahlanlage integrieren, wie sie beispielhaft in
Die dargestellte zweistufige Mahlanlage arbeitet wie folgt:
- Das zu zerkleinernde Ausgangsmaterial wird aus einem oder mehreren Bunkern 24 zugeführt, z. B. über die
25, 26, welche überTransporteinrichtungen den Materialeintritt 5 indie Sichtvorrichtung 1 münden. Dort erfolgt in der bereits beschriebenen Weise die Sichtung des Materials in drei Fraktionen. Dasaus dem Grobgutaustritt 7 ausgesichtete Grobgut wird erneut der Walzenpresse 22 zugeführt. Von dort gelangt es über dieTransporteinrichtungen 27 25, 26 erneut inund die Sichtvorrichtung 1. Das aus der zweiten Sichtstufe ausgesichtete Mittelgut, das heißt die mittlere Fraktion, wird überden Mittelgutaustritt 17 und dieTransporteinrichtung 28der Kugelmühle 23 zugeführt. Die Mahlanlage weist folglich dieWalzenpresse 22 für das Vormahlen des Materials und dieKugelmühle 23 für das Nachmahlen des Materials auf.Die Kugelmühle 23 ist z. B.mit einem Materialabzug 29,einem Entstaubungsfilter 30 und einem Mühlenventilator 31 ausgestattet. Das aus der Kugelmühle 23 austretende Material wird folglich über die 29, 32, 33 zugeführt, mit welchen es zum dynamischenTransporteinrichtungen Sichter 3 gebracht wird. Dort gelangt es über dieMaterialeintritte 19 wiederum in die zweite Sichtstufe.
- The starting material to be crushed is fed from one or
more bunkers 24, z. B. on the 25, 26, which open via thetransport devices material inlet 5 in thesighting device 1. There, in the manner already described, the sifting of the material into three fractions. The coarse material which has been emitted from thecoarse material outlet 7 is fed again to theroll press 22. From there it passes through the 27 and 25, 26 again in thetransport devices sighting device 1. The medium from the second stage of view medium, that is, the middle fraction is fed through theMittelgutaustritt 17 and thetransport device 28 of theball mill 23. The grinding plant thus comprises theroller press 22 for the premilling of the material and theball mill 23 for the post-milling of the material. Theball mill 23 is z. B. equipped with a material take-off 29, adedusting filter 30 and amill fan 31. The material emerging from theball mill 23 is thus supplied via the transport means 29, 32, 33, with which it is brought to thedynamic classifier 3. There it passes through thematerial inlets 19 again in the second view stage.
Die feinste Fraktion wird aus der Sichtvorrichtung, nämlich aus dem dynamischen Sichter 3 zusammen mit den Gasen durch den Feingutaustritt 18 in die folgenden Abscheidezyklone 34 abgezogen. Hier wird sie als Fertigprodukt von den Gasen getrennt, die mit dem Ventilator 35 abgezogen und teilweise zurück in die Sichtereinrichtung 1 und teilweise oder auch vollständig einer Entstaubung zugeführt werden.The finest fraction is withdrawn from the sighting device, namely from the
Die dargestellte zweistufige Mahlanlage kann in alternativer Ausgestaltung modifiziert werden. So kann z. B. die Walzenpresse 22 im Gegensatz zu der dargestellten Anordnung oberhalb der Sichtereinrichtung 1 platziert werden. In diesem Fall wird das zu mahlende Frischgut dann zuerst in die Walzenpresse aufgegeben, von der das vorgemahlene Material zur erfindungsgemäßen Sichtereinrichtung geführt wird. Dort wird das Material wieder in der beschriebenen Art und Weise in drei Fraktionen klassiert. Diese Ausführungsform ist nicht dargestellt.The illustrated two-stage grinding plant can be modified in an alternative embodiment. So z. B. the
Alternativ besteht außerdem die Möglichkeit, in die zweistufige Mahlanlage eine zweite, separate Sichtvorrichtung zu integrieren, so dass das Austragsgut der Kugelmühle dann nicht der in den Figuren dargestellten ersten Sichtvorrichtung, sondern einer nicht dargestellten, separaten zweiten Sichtvorrichtung zugeführt wird. Alternativ kann auch lediglich mit einer einzigen Zerkleinerungsvorrichtung, z. B. der dargestellten Walzenpresse, gearbeitet werden, so dass dann auf die zusätzliche Kugelmühle verzichtet wird. Dann erfolgt die Fertigmahlung in der Walzenpresse, wobei die erfindungsgemäße Sichtvorrichtung die Walzenpresse dann eine "einfache", "einstufige" Kreislaufmahlanlage bilden. Auch dieses ist in den Figuren nicht dargestellt. Der erfindungsgemäße, mehrstufige Sichter lässt sich jedoch gleichermaßen für die verschiedenen Mahlanlagen-Typen einsetzen.Alternatively, it is also possible to integrate in the two-stage grinding a second, separate viewing device, so that the Austragsgut the ball mill is then not shown in the figures first viewing device, but a separate second viewing device, not shown, is supplied. Alternatively, only with a single crushing device, for. As the roller press shown, are worked, so that is then dispensed with the additional ball mill. Then, the final grinding takes place in the roller press, the visual device according to the invention then form the roller press a "simple", "single-stage" Kreislaufmahlanlage. This is not shown in the figures. However, the multi-stage classifier according to the invention can be used equally for the different types of grinding equipment.
Claims (19)
- A device (1) for purposes of separating granular material into at least three fractions, with
at least one static separator (2) forming a first separation stage, and
at least one dynamic separator (3) forming a second separation stage, wherein
the static separator (2) is designed as a cross-flow separator, and, in a separator housing (4) with at least one first material entry port (5), at least one separator gas inlet (6) and at least one coarse grade material exit port (7), has a plurality of baffle and guide fittings (8, 9) arranged under one another in the form of a staircase, wherein
the dynamic separator (3) is designed as a rod basket separator with a rotating rod basket (12), and has, at least in some regions, a cylindrical separator housing (11) with at least one medium grade material exit port (17) and one fine grade material exit port (18), characterised in that,
the static separator (2) with its separator housing (4) is connected directly onto the side of the separator housing (11) of the dynamic separator (3) and merges into the latter with a tangential or spiral-form orientation, and
the rod basket (12) of the dynamic separator (3) rotates about a vertical axis (14), and
the separator housing (11) of the dynamic separator (3) has an upper housing section (11 a), in which the rotating rod basket is arranged, and has a lower housing (11 b), wherein
the static separator (2) with its housing (4) is connected onto the lower housing section (11 b) and merges into the latter. - The device in accordance with claim 1, characterised in that, the baffle and/or guide fittings are formed from baffle plates and/or guide vanes (8, 9) that are inclined relative to one another.
- The device in accordance with claim 2, characterised in that, the inclination of the baffle plates and/or guide vanes (8, 9) can be adjusted.
- The device in accordance with claim 1, characterised in that, the baffle and/or guide fittings (8, 9) are formed from roof-type fittings.
- The device in accordance with claim 4, characterised in that, the roof-type fittings can be moved in the horizontal direction.
- The device in accordance with one of the claims 1 to 5, characterised in that, the shaft-type housing (4), or at least one shaft wall (21) of the said housing of the static separator (2) is oriented at an angle to the vertical, for example, at a prescribed angle (a) of between 10° and 70° relative to the vertical.
- The device in accordance with one of the claims 1 to 6, characterised in that, the separation zone of the static separator (2), formed between the baffle and/or guide fittings (8, 9) arranged under one another in the form of a staircase, is oriented at a prescribed angle (ß) of between 10° and 70° relative to the vertical.
- The device in accordance with one of the claims 1 to 7, characterised in that, the separator gas entry port (6) is formed by at least one entry port opening arranged at an angle above the fittings (8, 9).
- The device in accordance with one of the claims 1 to 8, characterised in that, the separator gas entry port (6) is alternatively or additionally formed from a plurality of openings arranged in the shaft wall (21) of the separator housing (4) of the static separator (2), and adjustable as required, or from a region of the said housing without a shaft wall.
- The device in accordance with one of the claims 1 to 9, characterised in that, air distribution devices, for example, perforated plates, are arranged in the separator housing (3) of the static separator (2) upstream of the baffle and/or guide fittings (8, 9) in the flow direction.
- The device in accordance with one of the claims 1 to 10, characterised in that, the tangential or spiral connection is oriented in the direction of rotation, or against the direction of rotation, of the rod basket (12).
- The device in accordance with one of the claims 1 to 11, characterised in that, the separator housing (11) of the dynamic separator (3) has at least one second material entry port (19).
- The device in accordance with one of the claims 1 to 12, characterised in that, two or a plurality of static separators (2), in each case with a separator housing (4), are connected onto the side of the dynamic separator (3).
- The device in accordance with claim 13, characterised in that, the plurality of static separators (2) are arranged over the periphery with an angular displacement of 360°/n, wherein n corresponds to the number of static separators.
- The device in accordance with one of the claims 1 to 14, characterised in that, additional baffle fittings are arranged in the separator housing (11) of the dynamic separator (3), for example, in its lower housing section (11 b); these are preferably arranged on the inner face of the housing wall.
- The device in accordance with one of the claims 1 to 15, characterised in that, the separator housing (11) of the dynamic separator (3) is provided with one or a plurality of additional air supplies as a bypass, for example in its upper housing section (11 a).
- A grinding facility, in particular a circulatory grinding facility, or a multistage grinding facility, for the grade reduction of granular material, with at least one first grade reduction device (22), and with at least one separation device (1), in accordance with one of the claims 1 to 16, wherein
the material exiting from the first grade reduction device (22) enters via the first material entry port (5) into the separation device, wherein
the coarse grade material exiting from the coarse grade material exit port (7) of the static separator (2) is supplied to the first grade reduction device (22), and wherein
the medium grade material exiting from the dynamic separator (3) is supplied to the first grade reduction device (22), or to an additional second grade reduction device (23). - The facility in accordance with claim 17, with a second grade reduction device (23), wherein the medium grade material exiting from the dynamic separator (3) is completely or partially supplied to the second grade reduction device (23), and wherein
the material exiting from the second grade reduction device (23) is supplied via the second material entry port (19) to the dynamic separator (3), or to a separate second separator device. - The facility in accordance with claim 17 or 18, characterised in that, the first grade reduction device (22) is designed as a roller press, and/or the second grade reduction device (23) is designed as a ball mill.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102011055762.8A DE102011055762B4 (en) | 2011-11-28 | 2011-11-28 | Device for sifting granular material and grinding plant |
PCT/EP2012/073513 WO2013079416A1 (en) | 2011-11-28 | 2012-11-23 | Device for sifting granular material |
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Publication Number | Publication Date |
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EP2785472A1 EP2785472A1 (en) | 2014-10-08 |
EP2785472B1 true EP2785472B1 (en) | 2016-07-20 |
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EP12790561.0A Active EP2785472B1 (en) | 2011-11-28 | 2012-11-23 | Device for classifying grainy products |
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US (1) | US9636712B2 (en) |
EP (1) | EP2785472B1 (en) |
CN (1) | CN104039466B (en) |
DE (1) | DE102011055762B4 (en) |
DK (1) | DK2785472T3 (en) |
ES (1) | ES2592632T3 (en) |
IN (1) | IN2014KN01125A (en) |
WO (1) | WO2013079416A1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
ES2592632T3 (en) | 2016-11-30 |
DK2785472T3 (en) | 2016-10-24 |
CN104039466B (en) | 2017-05-24 |
WO2013079416A1 (en) | 2013-06-06 |
DE102011055762A1 (en) | 2013-05-29 |
DE102011055762B4 (en) | 2014-08-28 |
US20140306044A1 (en) | 2014-10-16 |
IN2014KN01125A (en) | 2015-10-16 |
EP2785472A1 (en) | 2014-10-08 |
US9636712B2 (en) | 2017-05-02 |
CN104039466A (en) | 2014-09-10 |
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APBM | Appeal reference recorded |
Free format text: ORIGINAL CODE: EPIDOSNREFNO |
|
APBP | Date of receipt of notice of appeal recorded |
Free format text: ORIGINAL CODE: EPIDOSNNOA2O |
|
APBU | Appeal procedure closed |
Free format text: ORIGINAL CODE: EPIDOSNNOA9O |