WO2023171765A1 - Procédé de broyage de charbon, procédé de fabrication de charbon pour coke et appareil de broyage de charbon - Google Patents

Procédé de broyage de charbon, procédé de fabrication de charbon pour coke et appareil de broyage de charbon Download PDF

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Publication number
WO2023171765A1
WO2023171765A1 PCT/JP2023/009153 JP2023009153W WO2023171765A1 WO 2023171765 A1 WO2023171765 A1 WO 2023171765A1 JP 2023009153 W JP2023009153 W JP 2023009153W WO 2023171765 A1 WO2023171765 A1 WO 2023171765A1
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Prior art keywords
coal
particle size
crusher
crushing
pulverizer
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PCT/JP2023/009153
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English (en)
Japanese (ja)
Inventor
拓陽 水野
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Ｊｆｅスチール株式会社
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Application filed by Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Priority to JP2023557814A priority Critical patent/JPWO2023171765A1/ja
Publication of WO2023171765A1 publication Critical patent/WO2023171765A1/fr

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    • 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
    • B02C13/26—Details
    • B02C13/30—Driving mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C25/00—Control arrangements specially adapted for crushing or disintegrating
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general

Definitions

  • the present disclosure relates to a method for pulverizing coal, a method for producing coal for coke, and a coal pulverizer.
  • the particle size distribution of coal charged into a coke oven for producing coke is adjusted to a target particle size distribution.
  • the crusher In order to adjust the particle size distribution of coal charged into a coke oven, it is common to adjust the crushing strength of the pulverizer that crushes the coal.
  • the crushing strength of the crusher is adjusted by changing the current value of the crusher's motor, changing the rotation speed of the crusher's hammer, etc. .
  • Patent Document 1 discloses a technique of measuring the particle size of coal crushed by a crusher and changing the crushing strength of the crusher based on the measured particle size.
  • Patent Document 1 when the hammer of one of a plurality of crushers is worn out and the worn crusher cannot crush coal with desired characteristics, Coarse particles with large particle sizes remain, and coal may not be pulverized to the target particle size distribution.
  • the purpose of the present disclosure is to provide a coal pulverizing method that can pulverize coal to a target particle size even if there is a malfunctioning pulverizer among a plurality of pulverizers, a method for producing coal for coke, and a coal pulverizing method.
  • the purpose is to provide equipment.
  • a coal pulverizing method includes: A method for crushing coal in a coal crushing device that crushes coal conveyed by a plurality of installed conveyors,
  • the coal crushing device includes, for each conveyor of the plurality of conveyors, at least one blending tank, a crusher, and a sensor arranged along the conveyor,
  • the method for pulverizing the coal includes: the at least one blending tank cutting out a predetermined amount of coal; the pulverizer pulverizes the cut coal; the sensor detecting the particle size of the crushed coal;
  • the crushing strength of the plurality of pulverizers is adjusted for each pulverizer based on the granularity of the coal detected by the sensor so that the particle size of the coal that is combined after being pulverized by the plurality of pulverizers becomes the target particle size.
  • a method for producing coal for coke according to an embodiment of the present disclosure produces coal for coke using the above coal pulverization method.
  • a coal pulverizer includes: A coal crushing device that crushes coal conveyed by a plurality of installed conveyors, Each of the plurality of conveyors includes at least one blending tank, a crusher, and a sensor arranged along the conveyor, The coal crushing device further includes a control device, The at least one blending tank cuts out a predetermined amount of coal; The pulverizer pulverizes the cut out coal; the sensor detects the particle size of the crushed coal; The control device controls the crushing strength of the plurality of pulverizers based on the particle size of the coal detected by the sensor so that the particle size of the coal that is combined after being pulverized by the plurality of pulverizers becomes a target particle size. is adjusted for each pulverizer.
  • the coal can be pulverized to achieve the target particle size. be able to.
  • FIG. 1 is a diagram schematically showing a configuration example of a coal pulverizer according to an embodiment of the present disclosure.
  • 1 is a diagram schematically showing a configuration example of a control device according to an embodiment of the present disclosure. It is a figure showing an example of particle size distribution of coal crushed by each crusher. It is a figure showing an example of particle size distribution of coal charged into a coke oven.
  • FIG. 3 is a diagram showing an example of a comparison between an ideal particle size distribution and an actual particle size distribution.
  • 1 is a flowchart illustrating an example of a procedure of a coal pulverizing method according to an embodiment of the present disclosure.
  • FIG. 3 is a diagram showing an example of a comparison between an ideal particle size distribution and an actual particle size distribution.
  • FIG. 1 is a diagram schematically showing a configuration example of a coal pulverizer 1 according to an embodiment of the present disclosure.
  • the coal crushing device 1 is a device that crushes coal conveyed by a plurality of installed conveyors. Although the conveyor is not shown in FIG. 1, the conveyor conveys coal between each device in the coal crushing device 1.
  • FIG. 1 shows an example of a configuration in which three conveyors are installed.
  • the number of conveyors installed in the coal crusher 1 is not limited to three.
  • the number of conveyors installed may be two or four or more.
  • the coal crushing apparatus 1 includes blending tanks 10A to 10C, crushers 20A to 20C, sensors 30A to 30C, a control device 40, and a controller 50.
  • the coal pulverizer 1 is equipped with three blending tanks 10A, the number of blending tanks 10A with which the coal pulverizer 1 is provided is not limited to three, and the number of blending tanks 10A with which the coal pulverizer 1 is provided is not limited to three. The number may be one or more.
  • the coal pulverizer 1 includes three blending tanks 10B, the number of blending tanks 10B included in the coal pulverizer 1 is not limited to three, and the number of blending tanks 10B provided in the coal pulverizer 1 is one. It suffices if there are more than one.
  • the coal pulverizer 1 includes three blending tanks 10C, the number of blending tanks 10C provided in the coal pulverizer 1 is not limited to three, and the number of blending tanks 10C provided in the coal pulverizer 1 is one. It suffices if there are more than one.
  • the blending tanks 10A to 10C may be simply referred to as “blending tank 10" when there is no particular need to distinguish them.
  • the crushers 20A to 20C may be simply referred to as “pulverizers 20” and explained if there is no particular need to distinguish them.
  • the sensors 30A to 30C may be simply referred to as “sensor 30” and explained unless there is a particular need to distinguish them.
  • Coal supplied to the coal crusher 1 is stored in a coal yard 2 by brand. Coal crusher 1 crushes coal conveyed from coal yard 2 . Coal pulverized by the coal pulverizer 1 is supplied to a coke oven 3 that produces coke.
  • the blending tank 10 stores coal transported from the coal yard 2.
  • the three blending tanks 10A may store different brands of coal.
  • the three blending tanks 10B may store different brands of coal.
  • the three blending tanks 10C may store different brands of coal.
  • the blending tank 10 cuts out a predetermined amount of coal.
  • the predetermined amount may be an amount that is preset based on a coal blending plan.
  • the predetermined amount may be, for example, an amount set as a cutting amount per unit time.
  • the three blending tanks 10A may cut out each brand of coal in different predetermined amounts. The same applies to the three mixing tanks 10B and 10C.
  • the blending tanks 10A to 10C may each store coals having different hard globe crushing indices indicating the coal crushing index.
  • the blending tank 10A stores coal with a small hardglobe crushing index
  • the blending tank 10C stores coal with a high hardglobe crushing index
  • the blending tank 10B stores coal with an intermediate hardglobe crushing index. You can leave it there.
  • the hard globe crushing index is small, the coal is hard and difficult to crush.
  • the hard globe grinding index is large, the coal is soft and easy to grind.
  • the coal cut out in the three blending tanks 10A is mixed on a conveyor and conveyed to the crusher 20A by the conveyor.
  • the coal cut out in the three blending tanks 10B is mixed on a conveyor and conveyed to the crusher 20B by the conveyor.
  • the coal cut out in the three blending tanks 10C is mixed on a conveyor and conveyed to the crusher 20C by the conveyor.
  • the crusher 20 crushes the supplied coal.
  • the crusher 20 may be any crusher that can adjust the crushing strength when crushing coal.
  • the crusher 20 may be, for example, a hammer type crusher.
  • the crusher 20 may adjust the crushing strength by adjusting the rotation speed of the hammer, for example.
  • the crushing strength of the crusher 20 is controlled by the controller 50.
  • the crusher 20 crushes coal at a crushing intensity controlled by a controller 50.
  • the sensor 30 is a sensor that can detect the particle size of the coal crushed by the crusher 20.
  • the sensor 30 may detect estimated values of the particle size and weight ratio as the particle size of the coal.
  • the sensor 30 is installed downstream of the crusher 20.
  • Sensor 30A detects the particle size of coal crushed by crusher 20A.
  • Sensor 30B detects the particle size of coal crushed by crusher 20B.
  • Sensor 30C detects the particle size of coal crushed by crusher 20C.
  • the sensor 30 may be, for example, a camera capable of photographing the coal crushed by the crusher 20.
  • the sensor 30 detects the particle size of the coal crushed by the crusher 20 by image processing the photographed image of the coal.
  • the sensor 30 outputs the detected coal particle size to the control device 40.
  • the control device 40 acquires the particle size of coal detected by the sensor 30 from the sensor 30.
  • the control device 40 generates a control signal for adjusting the crushing strength of the crusher 20 based on the particle size of the coal acquired from the sensor 30, and outputs it to the controller 50.
  • control device 40 The details of the configuration and functions of the control device 40 will be described later.
  • the controller 50 receives a control signal for adjusting the crushing strength of the crusher 20 from the control device 40, and operates the crusher 20 at a crushing strength according to the received control signal.
  • the coal pulverized by the pulverizers 20A to 20C is conveyed by a conveyor, then merged, and charged into the coke oven 3 in a mixed state.
  • FIG. 2 is a diagram schematically showing a configuration example of the control device 40 according to an embodiment of the present disclosure.
  • the control device 40 may be a general-purpose computer such as a workstation or a personal computer, or may be a dedicated computer configured to function as the control device 40 of the coal crushing device 1.
  • the control device 40 includes a control section 41, an input section 42, an output section 43, a storage section 44, and a communication section 45.
  • the control unit 41 includes at least one processor, at least one dedicated circuit, or a combination thereof.
  • the processor is a general-purpose processor such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit), or a dedicated processor specialized for specific processing.
  • the dedicated circuit is, for example, an FPGA (Field-Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit).
  • the control unit 41 reads programs, data, etc. stored in the storage unit 44 and executes various functions.
  • the control unit 41 controls the controller 50.
  • the input unit 42 includes one or more input interfaces that detect user input and obtain input information based on user operations.
  • the input unit 42 includes, for example, physical keys, capacitive keys, a touch screen provided integrally with the display of the output unit 43, or a microphone that accepts voice input.
  • the output unit 43 includes one or more output interfaces that output information and notify the user.
  • the output unit 43 includes, for example, a display that outputs information as an image, a speaker that outputs information as audio, and the like.
  • the display included in the output unit 43 may be, for example, an LCD (Liquid Crystal Display), a CRT (Cathode Ray Tube) display, or the like.
  • the storage unit 44 is, for example, a flash memory, a hard disk, an optical memory, or the like. A part of the storage unit 44 may be located outside the control device 40. In this case, part of the storage unit 44 may be a hard disk, a memory card, etc. connected to the control device 40 via an arbitrary interface.
  • the storage unit 44 stores programs for the control unit 41 to execute each function, data used by the programs, and the like.
  • the communication unit 45 includes at least one of a communication module that supports wired communication and a communication module that supports wireless communication.
  • the control device 40 can communicate with other devices via the communication unit 45.
  • the control unit 41 of the control device 40 acquires the particle size of coal detected by the sensors 30A to 30C from the sensor 30 via the communication unit 45.
  • the control unit 41 determines the particle size of the coal that has been crushed by the plurality of crushers 20A to 20C and then merged on the conveyor, that is, the coal to be charged into the coke oven 3.
  • the crushing strength of each of the crushers 20A to 20C is calculated to make the particle size of the target particle size.
  • the control unit 41 outputs information on the calculated crushing strength of each of the crushers 20A to 20C to the controller 50 via the communication unit 45.
  • the target particle size is the ratio of the target particle size within a predetermined range as a ratio of the particle size of coal charged into the coke oven 3.
  • the control unit 41 controls the amount of coal charged into the coke oven 3 based on pre-measured data on the correlation between the crushing strength of each of the crushers 20A to 20C and the particle size of the coal crushed by the crushers 20A to 20C.
  • the crushing strength of each of the crushers 20A to 20C may be calculated to make the particle size of the coal to be the target particle size.
  • Preliminarily measured data on the correlation between the crushing strength of each of the crushers 20A to 20C and the particle size of the coal crushed by the crushers 20A to 20C may be stored in the storage unit 44.
  • the controller 50 When the controller 50 acquires information on the crushing strength of each of the crushers 20A to 20C from the control device 40, the controller 50 controls the crushers 20A to 20C to operate at the acquired crushing strength.
  • control device 40 and the controller 50 can adjust the crushing strength of the crushers 20A to 20C for each crusher 20 so that the particle size of the coal charged into the coke oven 3 becomes the target particle size.
  • FIG. 3A shows an example of the particle size of coal detected by the sensors 30A to 30C.
  • graph 101 shows the particle size of coal detected by sensor 30A.
  • Graph 102 shows the particle size of coal detected by sensor 30B.
  • Graph 103 shows the particle size of coal detected by sensor 30C.
  • the particle size of coal can be expressed as a distribution with the horizontal axis representing the particle size [mm] and the vertical axis representing the weight ratio [%].
  • the particle size of the coal to be produced may be calculated.
  • FIG. 3B shows an example of the particle size of the coal charged into the coke oven 3 calculated in this way.
  • Graph 104 shows the particle size of coal charged into coke oven 3.
  • FIG. 4 shows an example of a comparison between the ideal target particle size and the actual particle size of the coal charged into the coke oven 3.
  • graph 201 shows the target particle size of ideal coal.
  • a graph 202 shows the actual coal particle size calculated by the control unit 41 of the control device 40 based on the coal particle size obtained from the sensors 30A to 30C.
  • the control unit 41 sets the crushing strength of each of the crushers 20A to 20C so that the actual coal particle size approaches the target particle size based on the coal particle size obtained from the sensors 30A to 30C. It is calculated and output to the controller 50.
  • the control unit 41 sequentially repeats such processing.
  • control device 40 feedback-controls the crushing strength of the crushers 20A to 20C based on the particle size of the coal acquired from the sensors 30A to 30C, so that the coal crusher 1 can charge the coal into the coke oven 3.
  • the crushing strength of the crushers 20A to 20C can be controlled so that the grain size of the coal to be crushed becomes the target grain size.
  • the target particle size of the coal charged into the coke oven 3 will be explained in more detail. If the hard globe crushing index of the coal stored in the blending tanks 10A to 10C is different for each blending tank 10, the pulverizers 20A to 10C are adjusted so that the particle size of the coal charged into the coke oven 3 becomes the target particle size.
  • the target particle size after pulverization may be set every 20C.
  • the particle size distribution of the coal after it is crushed by each crusher 20 can be expressed by the Rosin-Rammler equation as shown in equation (1) below. Therefore, the target particle size for each pulverizer 20 after the coal is pulverized by each pulverizer 20 may be managed using the Rosin-Ramler equation.
  • W r indicates the weight ratio [%] of coal particles
  • D p indicates the particle diameter [mm] of coal
  • a and b indicate parameters.
  • the target particle size of the coal charged into the coke oven 3 may also be managed using the Rosin Rammler equation as the sum of the target particle sizes of the coal crushed by each crusher 20.
  • a graph 201 in FIG. 4 shows the ideal target particle size of coal charged into the coke oven 3.
  • the graph 201 in FIG. 4 is a distribution expressed by Rosin-Ramler's equation.
  • the target particle size of each of the crushers 20A to 20C for making the coal charged into the coke oven 3 have an ideal target particle size may be stored in the storage unit 44 in advance. Further, the target particle size of coal to be charged into the coke oven 3 may also be stored in the storage unit 44 in advance.
  • control unit 41 of the control device 40 acquires information on the particle size of coal from the sensor 30 during operation of the coal crushing device 1, it sequentially identifies the parameters of the Rosin-Ramler equation in equation (1), and identifies the parameters of the Rosin-Ramler equation in equation (1).
  • the crushing strength of the crusher 20 is adjusted based on the difference from the parameters of Rosin Rammler's equation. Thereby, the control device 40 can adjust the crushing strength of the crusher 20 by reflecting the latest equipment status of the coal crushing device 1.
  • the hammer of the crusher 20 may be worn out. In this case, even if the crushing strength of the hammer of the crusher 20 is set to the maximum, coal of desired particle size may not be obtained. Moreover, malfunction may also occur if the properties of the coal stored in the blending tank 10 are different from the expected properties. In this case, even if the crushing strength of the hammer of the crusher 20 is set to the maximum or minimum, coal with a desired particle size may not be obtained.
  • the control unit 41 of the control device 40 may determine whether the crusher 20 is malfunctioning based on the particle size of the coal detected by the sensor 30.
  • the controller 40 controls the The section 41 changes the crushing strength of the crushers 20 other than the malfunctioning crusher 20.
  • control unit 41 changes the crushing strength of the crushers 20 other than the malfunctioning crusher 20 so that the particle size of the coal charged into the coke oven 3 becomes the target particle size.
  • the control unit 41 changes the crushing strength of the crushers 20B and 20C that are not malfunctioning.
  • the control unit 41 outputs information on the changed crushing strength to the controller 50.
  • the controller 50 controls the crushers 20A to 20C to operate at the changed crushing strength.
  • the coal pulverizer 1 can ensure that the particle size of the coal charged into the coke oven 3 reaches the target particle size even if there is a malfunctioning pulverizer 20 among the pulverizers 20A to 20C.
  • the crushing strength of the crushers 20A to 20C can be controlled so that
  • step S101 data on the correlation between the crushing strength of each of the crushers 20A to 20C and the particle size of the coal crushed by the crushers 20A to 20C, measured in advance, is stored in the storage unit 44.
  • step S102 the control device 40 calculates the crushing strength of the crushers 20A to 20C so that the particle size of the coal charged into the coke oven 3 becomes the target particle size.
  • step S103 the crushers 20A to 20C crush the coal at the calculated crushing strength.
  • step S104 the control device 40 calculates the particle size of the coal to be charged into the coke oven 3 based on the particle size of the coal detected by the sensors 30A to 30C, and determines whether the calculated particle size is the target particle size. do. At this time, if the difference between the calculated particle size and the target particle size is within a predetermined range, the control device 40 may determine that the calculated particle size is the target particle size.
  • step S104 determines whether the control device 40 ends the process. If the determination in step S104 is No, the control device 40 proceeds to step S105.
  • step S105 the control device 40 determines whether any of the crushers 20A to 20C is malfunctioning.
  • step S105 determines whether the determination in step S105 is No. If the determination in step S105 is No, the control device 40 returns to step S102. If the determination in step S105 is Yes, the control device 40 proceeds to step S106.
  • step S106 the control device 40 changes the crushing strength of the crushers 20 other than the malfunctioning crusher 20. At this time, the control device 40 controls the malfunctioning crusher 20 to operate at the maximum or minimum crushing strength. After that, the control device 40 proceeds to step S103.
  • FIG. 6 is a diagram showing an example in which an ideal particle size distribution and an actual particle size distribution are compared.
  • Graph 301 shows an ideal particle size distribution.
  • Graph 302 shows the actual particle size distribution.
  • the target particle size was a particle size distribution in which the weight ratio of coal particles with a particle size of 3 mm or less was 75% ⁇ 3%. This particle size distribution corresponds to graph 301.
  • a graph 302 shows the particle size distribution at this time.
  • control was performed to change the crushing strength of the crushers 20 other than the crusher 20 where the hammers were worn so as to reduce the weight ratio of coarse particles with a particle size of 6 mm or more by 3.6%. .
  • the weight ratio of coarse particles contained in the coal charged into the coke oven 3 decreased, and the particle size of the coal charged into the coke oven 3 approached the initial target particle size.
  • the control device 40 controls the sensor so that the particle size of the coal that has been pulverized by the plurality of pulverizers 20 and then merged becomes the target particle size.
  • the crushing strength of the plurality of crushers 20 is adjusted for each crusher 20 based on the particle size of the coal detected by the crusher 30.
  • the control device 40 sequentially adjusts the crushing strength of the plurality of crushers 20 for each crusher 20 based on the particle size of the coal detected by the sensor 30, so that the coal is charged into the coke oven 3.
  • the grain size of the coal can be made to be the target grain size.
  • the control device 40 controls the coal pulverizing method to control the coal pulverizing power of coal that has been pulverized by a plurality of pulverizers 20 and then merged.
  • the crushing strength of the crushers 20 other than the malfunctioning crusher 20 is changed so that the particle size becomes the target particle size. In this way, by changing the crushing strength of the crushers 20 other than the malfunctioning crusher 20, according to the coal crushing method and coal crushing apparatus 1 according to the present embodiment, the malfunctioning crusher 20, it is possible to crush coal to the target particle size.

Abstract

L'invention concerne un procédé de broyage de charbon pour un appareil de broyage de charbon 1 qui broie le charbon transporté par une pluralité de transporteurs installés. L'appareil de broyage de charbon 1 comprend, pour chacun de la pluralité de transporteurs, au moins un réservoir de mélange 10, un broyeur 20 et un capteur 30 disposé le long du transporteur. Le procédé de broyage de charbon comprend une étape consistant à découper une quantité prédéterminée de charbon avec le ou les réservoirs de mélange 10, une étape consistant à broyer le charbon découpé avec le broyeur 20, une étape consistant à détecter la taille de grain du charbon broyé avec le capteur 30 et une étape consistant à ajuster la résistance de broyage de chaque broyeur 20 d'une pluralité de broyeurs 20 sur la base de la taille de grain du charbon détectée par le capteur 30 de telle sorte que la taille de grain du charbon convergée après avoir été écrasée par la pluralité de broyeurs 20 est une taille de grain cible.
PCT/JP2023/009153 2022-03-11 2023-03-09 Procédé de broyage de charbon, procédé de fabrication de charbon pour coke et appareil de broyage de charbon WO2023171765A1 (fr)

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