JPWO2023106090A5 - - Google Patents

Claims (15)

Coal pulverization having a blending tank line comprising a blending tank for storing coal, a pulverizer for pulverizing the coal cut from the blending tank, and a granulometer for measuring the particle size of the coal crushed by the pulverizer. A coal pulverizing method for pulverizing coal using equipment, the method comprising:
The relationship between the crushing strength when crushing coal with the crusher and the particle size of the crushed coal is determined in advance,
Based on the above relationship, the coal is pulverized while adjusting the crushing strength of the pulverizer so that the particle size of the coal measured by the granulometer becomes the target particle size, and the particle size of the coal measured by the granulometer is Measure the variation over time with respect to the target particle size of
If the variation exceeds a predetermined threshold value, it is determined that the variation exceeds the threshold value due to a factor occurring within the pulverizer, and the pulverization method of the pulverizer is changed to reduce the variation. A method of crushing coal to below a threshold value. If the state in which the variation exceeds the threshold continues for a preset time period, it is determined that the variation exceeds the threshold due to a factor occurring within the pulverizer, and the pulverizer The coal pulverizing method according to claim 1, wherein the variation is made equal to or less than the threshold value by changing the pulverizing method. If the state in which the variation exceeds the threshold continues even after changing the coal blending plan, it is determined that the variation exceeds the threshold due to a factor occurring in the pulverizer, and the pulverizer The coal pulverizing method according to claim 1, wherein the variation is made equal to or less than the threshold value by changing the pulverizing method. The coal crushing equipment has two or more blending tank lines,
Measuring the variation in each of the two or more blending tank lines,
If the variation exceeds the threshold value in only part of the blending tank line of two or more series, the variation exceeds the threshold value due to a factor occurring in the crusher in the blending tank line. determining that the variation is equal to or less than the threshold value by changing the crushing method of the crusher in the blending tank line;
If the variation exceeds the threshold value in all of the blending tank lines of two or more series, it is not due to a factor occurring in the pulverizer in the blending tank line, but to a factor of the raw material itself supplied to the pulverizer. The coal pulverizing method according to any one of claims 1 to 3, wherein it is determined that the variation exceeds the threshold value, and the pulverizing method of the pulverizer in the blending tank line is not changed. The granulometer is configured to take an image of the surface of the coal seam that has been pulverized by the pulverizer and is transported by a conveyor, and to measure the coarse particle ratio of the coal based on the image. The method for pulverizing coal according to any one of claims 1 to 3 . The method for crushing coal according to any one of claims 1 to 3 , wherein the crusher is a hammer crusher, and the crushing strength of the crusher is the number of rotations of the hammer of the crusher. The crusher is a hammer crusher, and the crushing method of the crusher is changed by changing at least one of the rotating direction of the hammer of the crusher and the gap between the hammer of the crusher and the repulsion plate. The method for pulverizing coal according to any one of claims 1 to 3 . When the crusher is a hammer crusher, and as a change in the crushing method of the crusher, the rotation direction of the hammer of the crusher is first changed, and the variation still exceeds the threshold value even after changing the rotation direction. The method for pulverizing coal according to any one of claims 1 to 3 , further comprising changing the gap between the hammer and the repulsion plate of the pulverizer. A blending tank for storing coal, a pulverizer for pulverizing the coal cut from the blending tank, a controller for adjusting the crushing strength of the pulverizer, and a granulometer for measuring the particle size of the coal pulverized by the pulverizer. a blending tank line comprising;
Coal crushing equipment, comprising: an arithmetic control device that controls the crushing strength of the crusher via the controller and determines variations in particle size based on the particle size of the coal measured by the particle size meter. hand,
The arithmetic and control unit controls the particle size of the coal so that the particle size of the coal measured by the particle size meter becomes the target particle size based on a predetermined relationship between the crushing strength of the crusher and the particle size of the crushed coal. The controller controls the crushing strength of the crusher, and also measures the variation over time of the coal particle size measured by the particle size meter with respect to the target particle size, and if the variation exceeds a predetermined threshold value, the crushing It is determined that the variation exceeds the threshold value due to a factor occurring within the machine, and the variation is reduced by outputting the determination result, or by changing the grinding method of the crusher based on the determination result. Coal crushing equipment configured to output an instruction to below a threshold value. The arithmetic and control device determines that the variation exceeds the threshold due to a factor occurring within the crusher when a state in which the variation exceeds the threshold continues for a preset time period. The coal crushing equipment according to claim 9, configured as follows. The arithmetic and control device determines that the variation exceeds the threshold due to a factor occurring in the crusher, if the state in which the variation exceeds the threshold continues across changes in the coal blending plan. The coal crushing equipment according to claim 9, configured as follows. Having two or more lines of the blending tank line,
The arithmetic and control device measures the variation in each of the two or more blending tank lines,
If the variation exceeds the threshold value in only part of the blending tank line of two or more series, the variation exceeds the threshold value due to a factor occurring in the crusher in the blending tank line. determining that the variation is equal to or less than the threshold value by changing the crushing method of the crusher in the blending tank line;
If the variation exceeds the threshold value in all of the blending tank lines of two or more series, it is not due to a factor occurring in the pulverizer in the blending tank line, but to a factor of the raw material itself supplied to the pulverizer. The coal according to any one of claims 9 to 11, wherein the coal according to any one of claims 9 to 11 is configured so that it is determined that the variation exceeds the threshold value, and the pulverizing method of the pulverizer in the blending tank line is not changed. crushing equipment. The granulometer is configured to take an image of the surface of the coal seam that has been pulverized by the pulverizer and is transported by a conveyor, and measures the coarse particle ratio of the coal based on the image. The coal crushing equipment according to any one of 9 to 11 . The coal crushing equipment according to any one of claims 9 to 11 , wherein the crusher is a hammer crusher, and the crushing strength of the crusher is the number of rotations of the hammer of the crusher. The crusher is a hammer crusher, and the crushing method of the crusher is changed by changing at least one of the rotating direction of the hammer of the crusher and the gap between the hammer of the crusher and the repulsion plate. The coal crushing equipment according to any one of claims 9 to 11 , which is configured as follows.