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
  • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
  • B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
  • B02C13/18—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor
  • B02C13/1807—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate
  • B02C13/1835—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate by means of beater or impeller elements fixed in between an upper and lower rotor 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
  • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
  • B02C23/24—Passing gas through crushing or disintegrating zone
  • B02C23/32—Passing gas through 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
  • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
  • B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
  • B02C13/18—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor
  • B02C13/1807—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate
  • B02C13/1814—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate by means of beater or impeller elements fixed on top of a disc type rotor
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
  • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
  • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
  • B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
  • B02C13/18—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor
  • B02C13/1807—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate
  • B02C2013/1885—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate of dead bed type

Definitions

• the invention relates to a method for crushing bulk materials by the material is fed vertically from above to a Ze shrinking device and is carried out subsequent to the crushing process.
• a mill drying system with Vorz reduction is known.
• a bottom-free pre-shredding unit is combined with a downstream tube mill through which hot gas flows as a fine mill, the discharge line of which leads to a classifier.
• the bottomless pre-shredding unit is equipped with a grate to limit the grain size.
• the disadvantages of such a plant are essentially to be seen in the fact that, if the pre-comminution is insufficient, the material, which is above a certain grain size, has to be fed back into the feed chute of the pre-comminution system before it is subjected to further screening can.
• Another disadvantage is that the VorZ reduction only a relatively coarse fraction can be generated, so that the subsequent tube mill must be formed with at least two stages, i. that is, the amount of energy to be applied for the fine grinding is relatively large.
• DE-PS 35 45 691 is a device for classifying dusty bulk materials, in particular ground clinker, limestone or cement raw material by air separation.
• the material to be classified is fed to the cover plate of a cylindrical rotor and an annular cylindrical viewing space is given up between itself the rotor and a fixed blade ring surrounding it at a distance. While the coarse material sinks downward in the viewing space, the fine material is conveyed into the interior of the rotor and fed to a downstream separating device for separating fine material and classifying air.
• the fine air laden with viewing air becomes vertical through a tube arranged below the rotor drained down.
• Both the rotor and the blade ring are composed of a plurality of identical sections in a modular manner. Such a device cannot be used for crushing, but only for separating coarse and fine bulk-like components. Here, too, a further external comminution unit must be provided so that the components separated out as coarse material can be comminuted again and thus fed to the classifier.
• the general St. d. T. so-called vertical impact mills can be seen, which are essentially formed from a feed device in connection with a centrifugal wheel arranged concentrically around the drive shaft.
• the material is usually fed in from above and brought into a concentric bed by the centrifugal wheel, the kinetic energy of the accelerated feed material particles being converted into comminution work.
• grains in the discharge material of the conventional vertical impact mills that are not or only insufficiently crushed. In particular when using the vertical impact mills as pre-comminution units for ball mills, this results in the disadvantage that the use of coarse grinding media for comminuting these inadequately pre-comminuted grains within the vertical impact mill cannot be dispensed with.
• the invention is based on the object of designing a method and a device for comminuting bulk materials in which an optimal comminution process can be realized with the smallest possible apparatus structure.
• This object is achieved in accordance with the method in that the material is fed to a first accelerator device and brought into a first bed of material by this, fine-grained comminution products being carried out from this first comminution process by an air or gas flow, that coarse grains trickle down and are supplied by an air or gas flow to at least one further accelerator device which introduces the material into corresponding further material beds, the fine-grained comminution products obtained as a result of the comminution work being carried off by the air or gas flow while the coarse grains trickle down and into the again Circuit.
• This measure ensures that the materials which are above a certain grain size are directly fed to a secondary comminution. In contrast to St. d. In this way, a significantly higher degree of efficiency can be achieved with an optimum proportion of fine material.
• a preferred development of the method according to the invention characterized in that the air or gas flow is directed vertically downward upwards and that the fine-grained comminution products with a grain size ⁇ 5 mm are discharged in the upper region of the reduction device, while the coarser grains are moved in the circuit for so long until the desired degree of comminution is reached.
• the material is introduced in an annular bed, so that the grinding work can be carried out on the entire circumference of the pre- and post-shredding device.
• the air flow is generated by a ventila provided behind the separating device, the air being circulated.
• the air flow is generated by a fresh air or hot gas from a upstream and / or downstream process in the area of the crushing device blower.
• the fine material which is limited in its material granularities in accordance with the flow speed, is fed directly to a further comminution unit, in particular a ball mill, without prior separation in the air stream. Since a very good grain size ⁇ 5 mm has already been produced by the pre- and post-comminution, the first stage provided with coarse grinding bodies in the ball mill can be omitted, for example, in the ball mill. The ball mill is shorter overall and only requires less energy.
• the conveying air can be used at the same time as mill purging air.
• the invention is characterized according to the device by the combination of a vertical impact mill with a classifier in conjunction with an air or gas quantity flowing through the device vertically from the bottom upwards for removing the fine-grained comminution products.
• the vertical impact mill and the classifier are preferably arranged inside the same housing, the fan of the vertical impact mill being able to be placed on the housing of the classifier in a modular manner.
• the device has in each case at least one accelerator wheel arranged in the vertical impact mill and in the view, which are arranged axially one above the other but can be driven separately in rotation, the material first being the accelerator wheel of the vertical impact mill and then in counterflow the accelerator wheel of the prepareers is fed.
• the material to be shredded is preferably fed to the vertical impact mill via a feed device, such as in particular a cellular wheel sluice and an adjoining downpipe.
• the device also has an injector for the air or gas material mixture, which is designed as a riser pipe and is arranged below the classifier accelerator wheel.
• the steerer tube concentrically surrounds the drive shaft of the classifier accelerator wheel or wheels.
• the device be arranged at least one in the lower area of the classifier Has nozzle for the air or gas supply and at least one nozzle provided in the area of the classifier or the vertical impact mill for the discharge of the fine-grained comminution product.
• the feed material is fed centrally from above into a centrifugal or accelerator wheel and from there is centrifugally thrown outwards into an annular stationary bed of material. When it hits this bed, the kinetic energy of the accelerated feed material particles is converted into comminution work. Fine-grained comminution products ( ⁇ 5 mm) are carried upwards by an air flow and fed to a separating device, such as a cyclone or the like Injector-shaped riser pipe, in the center of which the rotor shaft is located, introduced and conveyed upwards into a second accelerator wheel. From there, the material is accelerated again, also spun into a circular material bed immediately below the former.
• a separating device such as a cyclone or the like Injector-shaped riser pipe
• the kinetic energy is first converted into comminution work by a collision with the trickle material from the upper comminution level, and further by an impact in the material bed.
• the fine material produced in this size reduction plane ( ⁇ 5 mm) is carried upwards in the air flow, insufficiently shredded material (> 5 mm) is again fed to the injector and thus again to the size reduction.
• a separator Downstream of the shredding is a separator, usually a cyclone.
• a fan can be arranged behind the cyclone.
• the cyclone exhaust air is fed back into the vertical impact mill via this fan through the nozzle ring and the riser pipe designed as an injector. This fan is supported by the fan action of the lower accelerator wheel.
• the transport of the coarse material via the nozzle ring and the riser pipe designed as an injector into the lower comminution level is not by circulating air, but partly or completely by fresh air or in conjunction with drying of the material to be comminuted by hot gases originate from a hot gas generator or as waste heat from upstream and / or downstream processes.
• This transport air can be pressed into the vertical impact mill by an upstream fan or can be sucked in by a fan arranged inside the vertical impact mill.
• the device 1 according to the invention shown in the single figure has the following components within one and the same housing 2:
• de Device 1 On the housing 2 de Device 1 has an air or gas supply nozzle 9 in the lower region and an air or gas discharge nozzle in the upper region.
• the shredding process is as follows:
• the material to be shredded is fed into the chute 8 from above through a cellular wheel sluice 11 and fed to the first accelerator wheel 4. As a result of the centrifugal force, the material is introduced into an annular first material bed 12. When it hits this bed 12, the movement energy of the accelerated feed material particles is converted into comminution work. Fine-grained comminution products with a grain size ( ⁇ 5 mm) are discharged through the air or gas flow supplied from below via the discharge nozzle 10 and fed to a downstream device (cyclone, ball mill or the like), which is not shown in any further detail. The coarser grain trickles downwards, where it builds up another mat fill 13. A nozzle ring 14 is introduced into the feed nozzle 9.
• a gap 16 is arranged with a predetermined height.
• the material trickling down over the bulk material is picked up by the air flow directed vertically upwards and fed vertically upwards to the second accelerator wheel 6 via the riser pipe 7. From there, the material is accelerated again and hurled into a further circular material bed 17 immediately below the first-mentioned material bed 12.
• the kinetic energy is first converted into comminution work by collision with the flow material from the upper comminution level 12, and further by impact in the material bed 17.
• the fine material with a grain size ⁇ 5 mm produced in this comminution level 17 is discharged in the air stream via the discharge nozzle 10 ⁇ worn. Inadequately shredded material is again fed to the riser pipe 7 and thus to the accelerator wheel 6 for the purpose of further shredding.

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• Engineering & Computer Science (AREA)
• Food Science & Technology (AREA)
• Disintegrating Or Milling (AREA)
• Combined Means For Separation Of Solids (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6370435

Family Applications (1)

Country Status (7)

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Family Cites Families (19)

• 1988
  • 1988-12-29 DE DE3844178A patent/DE3844178A1/de not_active Withdrawn
• 1989
  • 1989-12-02 US US07/720,756 patent/US5215262A/en not_active Expired - Fee Related
  • 1989-12-02 EP EP90900827A patent/EP0452350A1/de not_active Withdrawn
  • 1989-12-02 WO PCT/EP1989/001465 patent/WO1990007379A1/de not_active Ceased
  • 1989-12-02 BR BR898907865A patent/BR8907865A/pt unknown
  • 1989-12-02 JP JP2501618A patent/JPH04502424A/ja active Pending
• 1990
  • 1990-08-28 DK DK205890A patent/DK205890A/da not_active Application Discontinuation

Non-Patent Citations (1)

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