SU632390A1 - Maya-v coal crusher - Google Patents

Description

The invention relates to devices of olympic better solid materials and can be applied for grinding coal in thermal power plants and at coal preparation plants. The predominant area of its use is dust preparation at large thermal power plants. A device for grinding materials is known, comprising a vertical fixed body and an annular working space filled with balls and the material to be ground lying on a rotating drive disk. Grinding of the material is made by steel spheres when they roll over the entire volume of the working space during rotation of the drive discs. Since the movement of the balls occurs mainly along horizontal trajectories, the energy utilization rate in this mill is significantly higher than that of drum milling machines. However, steel balls used during the operation are used in this mill; in addition, the material requires fine crushing before grinding. The closest technical solution to the invention is a coal mill containing a stationary cylindrical vertical body and coocii D located in it a cylinder connected to the body by vertical partitions, a bowl-shaped rotor, an annular protrusion fixed to the body, loading and unloading devices. This famous mill is characterized by low technical and economic indicators: productivity, specific energy consumption for grinding coal. The purpose of the invention is to improve technical and economic performance. In the proposed mill, this is achieved in that it is provided with a ring coaxially located with the upper part of the cylinder and forming an annular dust-receiving chamber with the body, and a gap is formed between the rotor bowl and the annular protrusion.

Fig. 1 shows a preopag mill, a section; in fig. 2 shows a section along L-L of FIG. one.

In the cylindrical housing 1, a central cylinder 2 is placed coaxially with me, which is connected with the housing by vertical interlocks 3, which divide the upper part of the mill working space into annular cylindrical sectors. Below them is a continuous (not limited by partitions) cylindrical annular cavity 4, which is the main grinding zone. The working body of the mill is a bowl-shaped rotor located in the lower part of the body: 5, resting on the ball wheel 6; the shaft of the thicket is connected by a coupling 7 to the shaft 8 of an electric motor or gearbox (not shown). The bowl is divided by vertical partitions 9 into separate chambers. In the bowl there is an axial channel 1O connected by a number of cylindrical holes to the chambers, and inlets 11 to an air receiver 12. A toroidal air duct 13 connected by channels 14 to an air inlet 12 is placed under the air, and from the outside there are pipelines 15 connected to it which feeds hot air from the heater to the mill. The upper part of the body is covered with a lid

16c with a feed funnel 17 and is provided with a ring 18 coaxially located with the upper part of the cylinder, a lead-in nozzle 19 connecting the annular cavity 2O to the dust pipe. An annular protrusion 21 defines a cavity 4 and a rotating bowl.

After the engine is turned on and the rotor 5 is rotated through pipe 15 through the toroidal duct 13 and channels 14, hot air is fed from the radiator to the air inlet and then Gz working space. Through the funnel

17 continuously to be subject to

grinding coal, filling the working sectors of the body and the chamber of the rotating bowl. In cavity 4, continuous intensive grinding of coal under the action of shearing and impact impact forces caused by the rapid movement of the coal in the horizontal direction along circular trajectories of m is performed. The layers of coal in cavity 4 are continuously updated, moving upwards under the action of centrifugal force at the periphery of the bowl adjacent to the inner areas - under the force of gravity downwards. The crushed coal particles are removed from the working space by an upward flow of hot air: enter the upper annular cavity 2 O and look into solid and gas flow through the pipe 19 are directed in pyleprovod by which arrive in the intermediate hopper to the furnace or boiler thermal power.

The advantage of the proposed mill in comparison with the known ones is the lower specific energy consumption and the absence of grinding bodies, blades and breaker plates, which increases the technical and economic indicators.

Formula I.3 gain

Milling machine MAY-U, containing a stationary cylindrical vertical body and a cylinder coaxially located in it, connected to the body by vertical partitions, a bowl-shaped rotor, an annular protrusion mounted on the body, loading and unloading devices, different from that in order to improve technical and economic indicators The mill is equipped with a ring coaxially located with the upper part of the cylinder and forming an annular dust receptacle chamber with the housing, and between the rotor bowl and the annular protrusion It would be formed gap.

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