Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
  • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
  • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
  • B02C15/007—Mills with rollers pressed against a rotary horizontal disc
• • 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
  • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
  • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
  • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
  • B02C2015/002—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs combined with a classifier

Definitions

• the invention relates to a vertical roller mill according to the preamble of claim 1.
• Vertical mills or vertical roller mills, are well known (WO 2005/028112 A1, DE 31 00 341 A1).
• the above-mentioned vertical mills have in the upper region of the mill housing a sifter basket rotating about a vertical axis for classifying the fines-gas mixture conveyed upwards in the gas stream.
• the assemblies can therefore be partially made no more than one unit, but due to the size only as a subdivided units that need only be assembled or welded together at the site of the vertical mill.
• Another vertical mill which makes it possible to separate and dispense difficult-to-disperse components of a good mixture (DE 197 18 668 C2), has a horizontal sifter in the upper area of the mill housing which rotates about a horizontal axis and thus discharges fines makes the grinding and visual process possible.
• the invention is therefore based on the object to design a vertical mill and in particular a vertical roller mill so that even with increasing vertical mills and higher throughputs, in particular the classifier unit can be implemented as a unit or with multiple units and a significant increase in energy consumption for transport - And drying gas is avoided.
• An essential core idea of the invention can be seen in considerably shortening the transit path from ground millbase particles to the sifter, so that no higher energy requirement is required with regard to the required pressure and gas volume.
• this is achieved by departing from a sifter basket arranged in the upper region of the mill housing by arranging smaller sifters, in particular horizontal sifters or slightly inclined sifters of this kind, in the vicinity of the rolls.
• Another essential idea of the invention can be seen to be to arrange a guide means for the ground material ground by the grinding roller for the upwardly conveyed in the gas stream finer Mahlgutpenien, the guide means enables a spiral-like supply line to the respective horizontal seal.
• the thus designed vertical roller mill with rotating grinding table and at least two rolling on the grinding bed stationary grinding rollers therefore provides by the smaller units of horizontal viewers or such smaller classifiers with inclined axis of rotation, which arranged in the vicinity of the rollers be a more efficient use of energy in terms of the required transport and drying gas or even an energy saving.
• the combination of the corresponding horizontal reflec- tor with an arcuate guide device for better supply of the millbase particles conveyed upward in the gas stream reduces or, if appropriate, avoids an internal recirculation of mill-ground millbase particles, so that an energy reduction can also be achieved as a result.
• each grinding roller is assigned in each case an air classifier or horizontal classifier and a guide device, so that recirculation flows can be largely avoided.
• the respective air classifier is arranged offset in front of the respective grinding roller. Constructively, the displacement of the air classifier can therefore be seen to the guided through the center of the respective grinding roller vertical axis, as shown in Fig. 1, wherein this is done in the direction of the milled ground material, which is present behind the grinding roller.
• the arrangement of the respective air classifier offset from the corresponding grinding roller has the advantage that the grinding stock particles of the ground grinding material, which are present behind the grinding roller, can be better absorbed by the guiding device for the finer ground material transported upwards in the gas stream and directed to the associated horizontal leveler.
• the guide device is designed as a curved guide plate or as an arcuate collecting channel for spiraling the supply line to the sifter of the sifter.
• an arc-shaped collecting channel is provided for the upwardly transported regrind particles, the channel cross-section decreases in the direction of the air classifier, so that due to the increased flow velocity in this region and the centrifugal force acting there, a kind of priming for coarse grain takes place.
• These coarse particles are moved, in addition to the coarse particles rejected by the sifter of the sifter, onto a return device arranged below the sifter and returned to the grinding process.
• the return device is expediently designed as a funnel-shaped cone, whereby rejected coarse particles are preferably deposited on the return device inclined to the center, preferably approximately in the middle of the grinding plate.
• the arrangement of the air classifier or horizontal classifier can be structurally simple connected via a common inner, central discharge for the gas-fine material flow, so that a guide tube for forwarding the gas fine-material flow to downstream units such as cyclone or dust filter sufficient.
• the respective air separators can be equipped with separate outlets for the classified gas-fine-material mixture to the outside.
• a separate workup of the Mahlgutpelle can be carried out in different, desired fractions.
• Such a designed vertical mill with horizontally or inclined arranged air classifiers which are each assigned in particular a grinding roller, therefore, allows shorter transport routes for the ground millbase particles.
• the grinding process and the energy required for this can be significantly improved with the solution according to the invention, especially since the total height of the vertical mill is smaller and lower, and also a recirculation of ground millbase particles is largely avoided.
• the horizontal or inclined air classifiers improve the classification of fine particles compared to static classifiers in the upper part of a vertical mill.
• Fig. 1 shows a partial section of a vertical mill in the region of a grinding plate and thereon provided grinding rollers and in the vicinity of the rollers arranged horizontal viewers.
• the section shown corresponds approximately to a 90 ° cut, which may also include about 140 ° in view of the outer contours of the grinding rollers.
• a grinding roller is shown with view on the inside, while in the left portion of Fig. 1 is a side view of a second grinding roller with a schematic rocking lever assembly in the region of Mahltellerrandes and the annular gap.
• a vertical roller mill 1 according to the invention is shown schematically and in partial section.
• the detail section shows a vertical roller mill 1 in a circular segment-shaped section of about 90 ° between the vertical axes of two offset by about this angle, adjacent grinding rollers 4.
• the entire circle segment cut-out is therefore slightly larger and about 140 °.
• a grinding table 2 is shown with a direction of rotation D about its axis of rotation 3.
• two grinding rollers 4 are provided, wherein the lying in the plane of the drawing in the axis of rotation 3 grinding roller 4 is shown in the viewing direction from the inside out.
• the grinding roller 4 arranged in the left region or the left half of the roller mill 1 is shown in side view with a view of the conical roll shell and the suspension of the grinding roller via a rocking lever.
• annular gap 17 is provided. see, which normally has a blade ring and is intended for blowing the transport and drying gas 19 as a gas flow.
• the grinding material 13 to be comminuted and ground which can be centrally introduced, is fed to the grinding rollers 4 by the rotation D of the grinding plate 2 and comminuted by the pressure of the grinding roller and thus resulting shearing forces, so that behind the grinding roller 4 (on the left) a comminuted Grist is present.
• the newly introduced millbase 13 and the ground millbase 14 form a mixture in the real grinding process, which represent the grinding bed 15 in the outer region of the grinding plate 2.
• the stationary arranged grinding rollers 4 lead due to the force and frictional engagement with the grinding bed 15 in the same direction rotational movement Dw with the grinding table 2 by.
• each grinding roller 4 it is provided in the vicinity of each grinding roller 4, above the same, slightly offset in the direction of rotation D of the grinding table 2, a smaller wind sifter 7 with a horizontal axis 9, possibly also inclined axis to provide.
• the corresponding horizontal sifter 7 with a rotatably driven sifter basket 8 therefore receives in the gas flow 19 upwardly conveyed oversized regrind over a relatively short distance.
• a guide means 25 for example as a baffle 26 or as a collecting channel 27, is provided.
• This guide means 25 can therefore be specifically collected and guided the ascending gas-particle flow, wherein an arcuate design in the direction and around the air classifier 7, the spiral inflow still improved. This also contributes to the decreasing cross-section of the guide channel 27.
• the supply of the rising gas-Mahlpumble-mixture 21 to the air classifier 7 is therefore carried out in the same rotational and rotational direction as the air classifier itself, so that the classifier basket 8 can be done a good classification in fines and rejected coarse grave.
• sifting basket 8 classified fines can then, as shown in the left part of Fig. 1, are passed as fines 29, in particular pneumatically, to the outside and there in a central conveyor pipe or with decentralized individual lines subsequent units such as a cyclone or filter supplied.
• the air classifier 7 shown have a horizontal axis of rotation. Also possible is an inclined axis of rotation, wherein an inclination of the axis of rotation inwardly to the center of the grinding table favors the discharge of fines to the outside. On the other hand, an inclination of the axis of rotation of the air classifier 7 in the direction of the suspension and the oscillating lever of the corresponding grinding roller 4 favors the discharge of classified fines into the central, upper area of the roller mill, so that a central discharge for the fine material can be created.
• a funnel-shaped cone 31 is provided as a return device of the grass approximately in the central region of the grinding table 2.
• the construction according to the invention of the vertical roller mill with arrangement of air separators 7 in the vicinity of the grinding rollers 4 and in combination with the guide device 25 therefore permits a highly efficient grinding process, since recirculation of excess particles is largely prevented.

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• Engineering & Computer Science (AREA)
• Food Science & Technology (AREA)
• Crushing And Grinding (AREA)
• Combined Means For Separation Of Solids (AREA)

Priority Applications (5)

Applications Claiming Priority (1)

Publications (1)

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Family Applications (1)

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Cited By (6)

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Citations (4)

• 2013
  • 2013-08-19 WO PCT/EP2013/067206 patent/WO2014067688A1/de active Application Filing
  • 2013-08-19 JP JP2016535348A patent/JP2016528038A/ja active Pending
  • 2013-08-19 DK DK13788897.0T patent/DK2780113T3/da active
  • 2013-08-19 EP EP13788897.0A patent/EP2780113B1/de active Active
  • 2013-08-19 CN CN201380006355.5A patent/CN104540591A/zh active Pending

Patent Citations (4)

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