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Vertical roller mill

A technology of vertical roller mill and pulverizing roller, applied in combustion method, block/powder fuel preparation, block/powder supply/distribution, etc., can solve problems such as not necessarily effective

Inactive Publication Date: 2012-09-12
ING SHOJI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this vertical roller mill is effective for the pulverization of raw materials such as limestone where pulverized fine powder is easily attached to the surface of the roll, especially for the prevention of vibration caused by the pulverized fine powder adhesion, and for coal, petroleum, etc. Not necessarily effective for finely pulverized charcoal

Method used

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  • Vertical roller mill
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Experimental program
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Embodiment Construction

[0062] Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, it was confirmed by a pulverization experiment with a small pulverizer that a large number of fine powders passing through a No. 200 sieve and a particle size of -235 No. sieve can be obtained. The combination of the crushing surface shape of the roller and the table. figure 2 Indicates a small pulverizer for experiments.

[0063] Assuming that the crusher of the vertical roller mill is as figure 2 Shown is a structure in which the pulverizing roller 2 faces the outer peripheral surface of the horizontal rotary table 1 as a base member. Crushing Roller 2 in figure 2 The medium is a truncated conical roll, but it can also be replaced with a flat tire roll with a D / R of less than 4.3, or a convex tire roll with a D / R of 4.3 or more (see Figure 1). The flat tire roller 2 is inclined so that the large-diameter side faces the outer peripheral side and the sm...

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Abstract

Provided is a vertical roller mill which is equipped with a rotary table (1) driven to rotate, and a plurality of grinding rollers (2) comprising free rollers placed at fixed positions on the rotary table (1) so as to surround the rotation center line of the rotary table (1) to bite and crush a material to be ground between the turn table (1) and grinding rollers (2) with rotary driving of the rotary table (1). The vertical roller mill has a plurality of oblique slit grooves (6) placed at predetermined intervals in the perimeter direction on the annular crushing portion (3) on the upper face of the rotary table: each of the oblique silt grooves (6) is inclined to the table rotation direction or the reverse rotation direction thereof and is placed in a region of the angle of 45 degrees or more to the table radius line. The above constitution enables improvement of performance of feed control of the raw material like coal or petrol cokes as well as improvement of the performance of biting and crushing of a material.

Description

technical field [0001] The present invention relates to a vertical roller mill suitable for fine pulverization of coal or petroleum coke used as fuel in boilers for power generation and the like. Background technique [0002] Boilers for power generation mostly use coal and petroleum coke as fuel. The reasons for this are low fuel costs and easy regulation of power generation. Needless to say, in developing countries such as China, even in my country (Japan), a considerable portion of power generation still depends on coal and petroleum coke. However, coal and petroleum coke have a major disadvantage of high carbon dioxide emissions. [0003] Japan announced to the world a convention to reduce carbon dioxide emissions by 25% of 1990 levels by 2020. In order to realize the Convention, citizens and industries must bear great responsibilities and obligations, which is a very difficult value. However, since the Convention is issued, it is necessary to move towards this goal. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C15/04F23K1/00F23K3/02
CPCB02C15/003B02C15/004F23K1/00F23K2201/1006B02C15/04F23K3/02
Inventor 河津肇
Owner ING SHOJI
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