SU721118A1 - Centrifugal crusher - Google Patents

Description

(54) CENTRIFUGAL CRUSHER

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The invention relates to coal-mining, molar technology, in particular to the preparation of fuel for combustion in boiler units in the fuel feed system of thermal power plants.

Centrifugal crushers are known, including a housing, a drive, a rotating disk with blades mounted on it, a grate, an inlet for feeding raw fuel 1.

The operation of such crushers occurs as follows: the initial fuel through the Outlet pipe B comes to the central part of the rotating disk, when it is hit, it is partially crushed, then picked up by blades and, due to centrifugal forces, moves from the periphery to the surface of the disk. The final grinding occurs when the fuel particles strike the grate. The adjustment of the size of the finished crusher is made by changing the grate pitch.

Fine crusher centrifugal crushers provide significantly lower overmilling of the fuel than the most common hammer crushers for fine crushing.

The closest in technical essence is a centrifugal crusher, comprising a housing with a grate located inside it, inside which a horizontal disk mounted on a vertical shaft, with vertical blades mounted on it, inlet and outlet nozzles, and a drive 2 are mounted.

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However, existing centrifugal crushers have a number of significant drawbacks.

Effective destruction of the piece (1)) In the top 5, it occurs only when the particles hit the near-lattice. Due to the fact that the initial fuel moves on the surface, the disk, grinding and unloading of the finished product occurs

0 on the grid section (in height), not exceeding the thickness of the layer of material on the disk. The thickness of this layer is limited, since the resistance to movement of pieces of fuel over a metallic surface is substantially less than that over a layer of fuel. This leads to low productivity of centrifugal crushers. In addition, when fine grinding of wet coal occurs

Claims (2)

0 smearing of the grate. The purpose of the invention is to increase the projectile content of centrifugal crushers for fine crushing of wet stones. To do this, in a centrifugal crusher containing a body with a grate located in it, inside which lies a horizontal disk fixed to the vertical shaft with vertical blades mounted on it, the inlet and outlet nozzles and the drive, the horizontal disk is made with a gas distribution grid and height his mouth is equal to the height of the grate. When hot gases are supplied through the bifeeipcta of the disk-georadiently, a fluidized bed is formed inside the body of the dumper from the pieces of ground fuel and its drying takes place, and the presence of blades equal to the height of the collar, if there is a boiling layer of fuel, allows grinding and unloading of the formed dry finished product throughout its height, which significantly improves the performance of the crusher. The drawing shows a cross-section of the proposed crusher design, including the body 1, which houses: the inlet 2 supplying the initial fuel, output nozzles 3 of the finished product, grate 4.. Inside the body there is a disk 5, which is made in the form of gas distribution grids with holes mi 6. On it are mounted blades 7, whose height is equal to the height of the edge of the grid. The disk is connected to the electric motor 8 and can be rotated in the bearing block 9, which is enclosed to a water-cooled housing 10. Hot gas to the crusher is supplied through gas pipelines 11 and discharged into gas pipelines 12. At the end of the line, the movement of gas lines to the dashed lines,: Comm-dashed. The proposed crusher works as follows: The initial fuel through the inlet nozzle 2 enters the rotation 6 of the disk 6, when it is hit, it partially breaks down, the blade m 7 is picked up and the centrifugal forces are shifted in the direction of the strip grille 4, during a collision with which further fuel grinding occurs . Hot gas is evenly supplied through 6 holes of a gaiter cutter disk 5, with an average speed inside the body somewhat lower than the soaring speed of particles with the size of the product obtained, (which is determined by the distance between the grate 5 grid bars). in the original fuel, is carried along with the gas through the nozzles 12 and is separated in a loop and is not subjected to excessive grinding. Under the action of gas, particles of fuel in the source material, particles formed after impact of the fuel on the disk, and non-ground particles bounced after impact on the grate, for which the gas velocity is higher than the critical one, the rate of the onset of fluidization begins to fluidize and in the crusher boiling bed of capped chartz. The effective size of the particles forming the fluidized bed may be as much as the required size of the product obtained. {see, for example. Romankov P.G. and Rashkrvska NB Drying in suspension, 1968). In the fluidized bed, there is a deep drying of the fuel, which eliminates the possibility of The effect of glossing up the grate. Fluidized bed particles,. suspended, picked up by the blades and along their lateral surface, due to centrifugal forces, are transported in the direction of the grate retet before colliding with it. Thus, the grinding of the fuel and the unloading of the finished shredder occurs over the entire height of the grate, which leads to a significant increase in crusher productivity. The application of the proposed design will provide significant savings in capital costs for fuel preparation equipment in the building part due to the possibility of installing a smaller number of more efficient crushers compared to the existing ones or reducing the size of the equipment at the same capacity. Claims of the invention: A centrifugal crusher comprising a housing, with a grate located therein, inside of which is placed a horizontal Disc mounted on a vertical shaft with vertical blades mounted on it, an inlet and an outlet and an actuator, which is distinguished by its performance, the horizontal disc is made in the form of gas distribution grill, and the height of its blades is equal to the height of the grate. Sources of information taken into account in the examination of G. Author's certificate of the USSR 362528, cl. At 02 C 7/00, from 1968. 2. USSR author's certificate number 171332, cl. B 02 S 7/00, dated 1964 12