Coal crushing method, method for producing coal for coke, and coal crushing device

Abstract

Provided is a coal grinding method for a coal grinding apparatus 1 that grinds coal conveyed by a plurality of conveyors installed. The coal grinding apparatus 1 comprises, for each of the plurality of conveyors, at least one blending tank 10, a grinding mill 20, and a sensor 30 disposed along the conveyor. The coal grinding method includes a step for cutting out a predetermined amount of coal with the at least one blending tank 10, a step for crushing the cut out coal with the grinding mill 20, a step for detecting the grain size of crushed coal with the sensor 30, and a step for adjusting the grinding strength of each grinding mill 20 of a plurality of grinding mills 20 on the basis of the grain size of coal detected by the sensor 30 such that the grain size of coal converged after being crushed by the plurality of grinding mills 20 is a target grain size.

Description

[Technical field]

[0001] The present disclosure relates to a method for grinding coal, a method for producing coal for coke, and a coal grinding apparatus. [Background technology]

[0002] In the iron-making process in a blast furnace, it is important to ensure good ventilation inside the blast furnace. To ensure good ventilation inside the blast furnace, the coke charged into the blast furnace is required to be high-strength and uniform.

[0003] In order to produce high-strength and uniform coke, the particle size distribution of coal charged into a coke oven for producing the coke is adjusted to a target particle size distribution.

[0004] In order to adjust the particle size distribution of the coal charged into the coke oven, it is common to adjust the crushing strength of a crusher that crushes the coal. For example, when the crusher is a hammer-type crusher, the crushing strength of the crusher is adjusted by changing the current value of the crusher motor or the rotation speed of the crusher hammer.

[0005] For example, Patent Document 1 discloses a technique for measuring the particle size of coal pulverized by a pulverizer and changing the pulverization strength of the pulverizer based on the measured particle size. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2004-16983 A Summary of the Invention [Problem to be solved by the invention]

[0007] With the method described in Patent Document 1, for example, if the hammer of one of a plurality of pulverizers is worn out and the worn pulverizer is unable to pulverize coal with the desired characteristics, coarse particles with large particle sizes may remain, making it impossible to pulverize the coal to achieve the target particle size distribution.

[0008] An object of the present disclosure is to provide a coal crushing method, a method for producing coal for coke, and a coal crushing device that are capable of crushing coal to a target particle size even if one of a plurality of crushers is malfunctioning. [Means for solving the problem]

[0009] A method for crushing coal according to an embodiment of the present disclosure includes: A coal pulverization method in a coal pulverization device that pulverizes coal transported by a plurality of conveyors, comprising: The coal pulverizing device includes at least one blending tank, a pulverizer, and a sensor arranged along each of the plurality of conveyors; The coal crushing method includes the steps of: said at least one blending vessel cutting a predetermined amount of coal; The pulverizer pulverizes the cut coal; The sensor detects the particle size of the pulverized coal; adjusting the crushing strength of each of the plurality of crushers based on the particle size of the coal detected by the sensor so that the particle size of the coal that has been crushed by the plurality of crushers and then joined together becomes a target particle size; Includes.

[0010] A method for producing coal for coke according to one embodiment of the present disclosure produces coal for coke using the above-mentioned coal crushing method.

[0011] A coal grinding apparatus according to an embodiment of the present disclosure includes: A coal pulverizing device for pulverizing coal transported by a plurality of conveyors, At least one blending tank, a grinder, and a sensor are disposed along each of the plurality of conveyors; The coal pulverizer further comprises a control device, The at least one blending tank cuts a predetermined amount of coal; The pulverizer pulverizes the cut coal, The sensor detects the particle size of the pulverized coal; The control device adjusts the crushing strength of each of the multiple crushers based on the particle size of the coal detected by the sensor so that the particle size of the coal that is crushed by the multiple crushers and then combined becomes a target particle size. Effect of the Invention

[0012] According to the coal crushing method, the method for producing coal for coke, and the coal crushing apparatus disclosed herein, it is possible to crush coal to a target particle size even if one of a plurality of crushers is malfunctioning. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a diagram illustrating a schematic configuration example of a coal pulverizer according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a diagram illustrating a configuration example of a control device according to an embodiment of the present disclosure. [Figure 3A] FIG. 4 is a diagram showing an example of particle size distribution of coal pulverized by each pulverizer. [Figure 3B] FIG. 2 is a diagram showing an example of a particle size distribution of coal charged into a coke oven. [Figure 4] FIG. 1 is a diagram showing an example of a comparison between an ideal particle size distribution and an actual particle size distribution. [Diagram 5] 1 is a flowchart showing an example of a procedure of a coal grinding method according to an embodiment of the present disclosure. [Figure 6] FIG. 1 shows an example of ideal versus actual particle size distribution. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0015] FIG. 1 is a diagram illustrating a schematic configuration example of a coal pulverizer 1 according to an embodiment of the present disclosure.

[0016] The coal pulverizer 1 is an apparatus that pulverizes coal transported by a plurality of installed conveyors. Although the conveyors are not shown in Fig. 1, the conveyors transport coal between each device in the coal pulverizer 1. Fig. 1 shows an example of a configuration in which three conveyors are installed.

[0017] The number of conveyors installed in the coal pulverizer 1 is not limited to three. The number of conveyors installed may be two, or may be four or more.

[0018] The coal pulverizer 1 includes blending vessels 10A to 10C, pulverizers 20A to 20C, sensors 30A to 30C, a control device 40, and a controller 50.

[0019] The three conveyors installed in the coal pulverizer 1 are referred to as conveyor A, conveyor B, and conveyor C, respectively. Along conveyor A, at least one blending tank 10A, pulverizer 20A, and sensor 30A are installed. Along conveyor B, at least one blending tank 10B, pulverizer 20B, and sensor 30B are installed. Along conveyor C, at least one blending tank 10C, pulverizer 20C, and sensor 30C are installed.

[0020] 1, the coal pulverizer 1 includes three blending vessels 10A, but the number of blending vessels 10A included in the coal pulverizer 1 is not limited to three, and the number of blending vessels 10A included in the coal pulverizer 1 may be one or more. Furthermore, the coal pulverizer 1 includes three blending vessels 10B, but the number of blending vessels 10B included in the coal pulverizer 1 is not limited to three, and the number of blending vessels 10B included in the coal pulverizer 1 may be one or more. Furthermore, the coal pulverizer 1 includes three blending vessels 10C, but the number of blending vessels 10C included in the coal pulverizer 1 is not limited to three, and the number of blending vessels 10C included in the coal pulverizer 1 may be one or more.

[0021] Hereinafter, blending tanks 10A-10C may be simply referred to as "blending tank 10" when there is no particular need to distinguish between them. Furthermore, crushers 20A-20C may be simply referred to as "crusher 20" when there is no particular need to distinguish between them. Furthermore, sensors 30A-30C may be simply referred to as "sensor 30" when there is no particular need to distinguish between them.

[0022] The coal supplied to the coal pulverizer 1 is stored by brand in a coal yard 2. The coal pulverizer 1 pulverizes the coal transported from the coal yard 2. The coal pulverized by the coal pulverizer 1 is supplied to a coke oven 3 that produces coke.

[0023] The blending tanks 10 store coal transported from the coal yard 2. In the example shown in FIG. 1, the three blending tanks 10A may store different brands of coal. Similarly, the three blending tanks 10B may store different brands of coal. Similarly, the three blending tanks 10C may store different brands of coal.

[0024] The blending tank 10 cuts out a predetermined amount of coal. The predetermined amount may be an amount that is set in advance based on a coal blending plan. The predetermined amount may be, for example, an amount that is set as a cut-out amount per unit time.

[0025] For example, when different brands of coal are stored in the three blending tanks 10A, the three blending tanks 10A may each discharge a different amount of coal of each brand. The same applies to the three blending tanks 10B and 10C.

[0026] Blending tanks 10A-10C may store coals with different Hardgrove crushing indexes, which indicate the crushing index of coal. For example, blending tank 10A may store coals with a small Hardgrove crushing index, blending tank 10C may store coals with a large Hardgrove crushing index, and blending tank 10B may store coals with an intermediate Hardgrove crushing index. If the Hardgrove crushing index is small, the coal is hard and difficult to crush. If the Hardgrove crushing index is large, the coal is soft and easy to crush.

[0027] The coals cut out from the three blending tanks 10A are mixed on a conveyor and transported to pulverizer 20A by the conveyor. The coals cut out from the three blending tanks 10B are mixed on a conveyor and transported to pulverizer 20B by the conveyor. The coals cut out from the three blending tanks 10C are mixed on a conveyor and transported to pulverizer 20C by the conveyor.

[0028] The pulverizer 20 pulverizes the coal supplied from the blending tank 10 when the coal is transported by a conveyor.

[0029] The pulverizer 20 may be any pulverizer capable of adjusting the pulverizing strength when pulverizing coal. The pulverizer 20 may be, for example, a hammer-type pulverizer. When the pulverizer 20 is a hammer-type pulverizer, the pulverizer 20 may adjust the pulverizing strength by, for example, adjusting the rotation speed of the hammer.

[0030] The crushing intensity of the crusher 20 is controlled by the controller 50. The crusher 20 crushes the coal at the crushing intensity controlled by the controller 50.

[0031] The sensor 30 is a sensor capable of detecting the particle size of the coal pulverized by the pulverizer 20. The sensor 30 may detect an estimated value of particle size and weight percentage as the particle size of the coal. The sensor 30 is installed downstream of the pulverizer 20. The sensor 30A detects the particle size of the coal pulverized by the pulverizer 20A. The sensor 30B detects the particle size of the coal pulverized by the pulverizer 20B. The sensor 30C detects the particle size of the coal pulverized by the pulverizer 20C.

[0032] The sensor 30 may be, for example, a camera capable of photographing the coal pulverized by the pulverizer 20. When the sensor 30 is a camera, the sensor 30 detects the particle size of the coal pulverized by the pulverizer 20 by processing the photographed image of the coal.

[0033] The sensor 30 outputs the detected coal grain size to the control device 40.

[0034] The control device 40 acquires the particle size of the 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 the control signal to the controller 50.

[0035] The configuration and functions of the control device 40 will be described in detail later.

[0036] The controller 50 receives a control signal for adjusting the crushing intensity of the crusher 20 from the control device 40, and operates the crusher 20 at a crushing intensity according to the received control signal.

[0037] The coal pulverized by the pulverizers 20A to 20C is conveyed by a conveyor, where it joins together and is charged into the coke oven 3 in a mixed state.

[0038] 2 is a diagram illustrating a schematic 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 pulverizer 1.

[0039] The control device 40 includes a control unit 41 , an input unit 42 , an output unit 43 , a storage unit 44 , and a communication unit 45 .

[0040] The control unit 41 includes at least one processor, at least one dedicated circuit, or a combination of these. The processor is a general-purpose processor such as a central processing unit (CPU) or a graphics processing unit (GPU), or a dedicated processor specialized for a specific process. The dedicated circuit is, for example, a field-programmable gate array (FPGA) or an application specific integrated circuit (ASIC).

[0041] The control unit 41 reads the programs, data, etc. stored in the storage unit 44 and executes various functions. The control unit 41 controls the controller 50.

[0042] The input unit 42 includes one or more input interfaces that detect a user input and acquire input information based on a user operation. The input unit 42 includes, for example, physical keys, capacitive keys, a touch screen that is integral with the display of the output unit 43, or a microphone that accepts voice input.

[0043] The output unit 43 includes one or more output interfaces that output information to notify the user. The output unit 43 includes, for example, a display that outputs information as an image, a speaker that outputs information as sound, etc. The display included in the output unit 43 may be, for example, an LCD (Liquid Crystal Display), a CRT (Cathode Ray Tube) display, etc.

[0044] The storage unit 44 is, for example, a flash memory, a hard disk, an optical memory, etc. A part of the storage unit 44 may be outside the control device 40. In this case, the 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.

[0045] The storage unit 44 stores programs for the control unit 41 to execute each function, data used by the programs, and the like.

[0046] The communication unit 45 includes at least one of a communication module corresponding to wired communication and a communication module corresponding to wireless communication. The control device 40 is capable of communicating with other devices via the communication unit 45.

[0047] Next, the process executed by the control device 40 will be described.

[0048] The control unit 41 of the control device 40 acquires the coal grain size detected by the sensors 30A to 30C from the sensor 30 via the communication unit 45.

[0049] Based on the particle sizes of coal obtained from the sensors 30A-30C, the control unit 41 calculates the crushing strengths of each of the crushers 20A-20C for setting the particle size of coal that is crushed by the multiple crushers 20A-20C and then joined on the conveyor, i.e., the particle size of coal to be charged into the coke oven 3, to a target particle size. The control unit 41 outputs information on the calculated crushing strengths of each of the crushers 20A-20C to the controller 50 via the communication unit 45.

[0050] Here, the target particle size is a ratio of particle size of coal charged into the coke oven 3 within a predetermined targeted range.

[0051] The control unit 41 may calculate the crushing strength of each of the crushers 20A-20C for setting the particle size of the coal to be charged into the coke oven 3 to a target particle size, based on previously measured data on the correlation between the crushing strength of each of the crushers 20A-20C and the particle size of the coal crushed by the crushers 20A-20C. The previously measured data on the correlation between the crushing strength of each of the crushers 20A-20C and the particle size of the coal crushed by the crushers 20A-20C may be stored in the memory unit 44.

[0052] 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 so that they operate at the acquired crushing strengths.

[0053] This allows the control device 40 and the controller 50 to adjust the crushing strength of each of the crushers 20A to 20C for each of the crushers 20 so that the particle size of the coal charged into the coke oven 3 becomes the target particle size.

[0054] Fig. 3A shows an example of coal particle size detected by sensors 30A to 30C. In Fig. 3A, graph 101 shows coal particle size detected by sensor 30A. Graph 102 shows coal particle size detected by sensor 30B. Graph 103 shows coal particle size detected by sensor 30C. As shown in Fig. 3A, coal particle size can be expressed as a distribution with particle size [mm] on the horizontal axis and weight percentage [%] on the vertical axis.

[0055] When the control unit 41 of the control device 40 acquires the particle sizes of the coal pulverized by the pulverizers 20A to 20C as shown in FIG. 3A, the control unit 41 may add up the acquired three coal particle sizes to calculate the particle size of the coal to be charged into the coke oven 3.

[0056] 3B shows an example of the particle size of the coal charged into the coke oven 3, calculated in this manner. Graph 104 shows the particle size of the coal charged into the coke oven 3.

[0057] FIG. 4 shows an example of a comparison between an ideal target particle size and an actual particle size of coal charged into the coke oven 3.

[0058] 4, graph 201 shows the ideal target coal grain size. Graph 202 shows the actual coal grain size calculated by control unit 41 of control device 40 based on the coal grain sizes acquired from sensors 30A to 30C.

[0059] In the example shown in Fig. 4, the ideal target particle size of coal does not match the actual particle size of coal. In such a case, the control unit 41 calculates the crushing strength of each of the crushers 20A-20C for bringing the actual particle size of coal closer to the target particle size based on the particle sizes of coal acquired from the sensors 30A-30C, and outputs the calculated strength to the controller 50. The control unit 41 sequentially repeats such processing.

[0060] In this way, the control device 40 feedback controls the crushing strength of the crushers 20A-20C based on the coal particle size obtained from the sensors 30A-30C, so that the coal crushing device 1 can control the crushing strength of the crushers 20A-20C so that the particle size of the coal charged to the coke oven 3 becomes the target particle size.

[0061] Here, a more detailed description will be given of the target particle size of the coal charged into the coke oven 3. When the Hardgrove Crushing Index of the coal stored in the blending tanks 10A to 10C differs from one blending tank to another, a target particle size after pulverization may be set for each of the pulverizers 20A to 20C so that the particle size of the coal charged into the coke oven 3 becomes the target particle size.

[0062] The particle size distribution of the coal after the coal is pulverized in each pulverizer 20 can be expressed by the Rosin-Rammler formula as shown in the following formula (1). Therefore, the target particle size for each pulverizer 20 after the coal is pulverized in each pulverizer 20 may be managed by the Rosin-Rammler formula.

number

[0063] At this time, the target particle size of the coal charged into the coke oven 3 may also be managed by the Rosin-Rammler equation as the sum of the target particle sizes of the coal pulverized by each pulverizer 20.

[0064] Graph 201 in Fig. 4 shows an ideal target particle size of coal to be charged into the coke oven 3. Graph 201 in Fig. 4 shows a distribution expressed by the Rosin-Rammler formula.

[0065] The target particle size of each of the pulverizers 20A to 20C for obtaining an ideal target particle size of the coal charged into the coke oven 3 may be stored in advance in the memory unit 44. In addition, the target particle size of the coal charged into the coke oven 3 may also be stored in the memory unit 44 in advance.

[0066] When the control unit 41 of the control device 40 acquires coal particle size information from the sensor 30 during operation of the coal pulverizer 1, the control unit 41 sequentially identifies the parameters of the Rosin-Rammler equation in formula (1) and adjusts the pulverizing strength of the pulverizer 20 based on the difference from the parameters of the Rosin-Rammler equation for the target particle size. This allows the control device 40 to adjust the pulverizing strength of the pulverizer 20 to reflect the latest equipment status of the coal pulverizer 1.

[0067] (What to do if a grinder is malfunctioning) If any of the pulverizers 20A-20C malfunctions, the coal may not be pulverized, as shown by the data stored in the memory unit 44 relating the correlation between the crushing strength of each of the pulverizers 20A-20C and the particle size of the coal pulverized by the pulverizers 20A-20C.

[0068] An example of a malfunction of the pulverizer 20 may be, for example, a case where the hammer of the pulverizer 20 is worn out. In this case, even if the crushing strength of the hammer of the pulverizer 20 is set to the maximum, coal of the desired particle size may not be obtained. Malfunctions may also occur when 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 pulverizer 20 is set to the maximum or minimum, coal of the desired particle size may not be obtained.

[0069] The control unit 41 of the control device 40 may determine, based on the particle size of the coal detected by the sensor 30, whether or not the pulverizer 20 is malfunctioning.

[0070] If any of the crushers 20A to 20C is malfunctioning and the target particle size cannot be achieved even if the crushing strength of the malfunctioning crusher 20 is maximized or minimized, the control unit 41 of the control device 40 changes the crushing strength of the crushers 20 other than the malfunctioning crusher 20.

[0071] At this time, the control unit 41 changes the crushing strength of the pulverizers 20 other than the malfunctioning pulverizer 20 so that the particle size of the coal charged into the coke oven 3 becomes the target particle size.

[0072] For example, if the crusher 20A is malfunctioning, the control unit 41 changes the crushing strength of the crushers 20B and 20C that are not malfunctioning.

[0073] The control unit 41 outputs information about the changed crushing strength to the controller 50. The controller 50 controls the crushers 20A to 20C so that they operate at the changed crushing strength.

[0074] By performing such feedback control, the coal pulverizer 1 can control the pulverizing intensity of the pulverizers 20A-20C so that the particle size of the coal charged into the coke oven 3 becomes the target particle size, even if one of the pulverizers 20A-20C is malfunctioning.

[0075] An example of the procedure of a coal pulverizing method in the coal pulverizing apparatus 1 according to an embodiment of the present disclosure will be described with reference to the flowchart shown in FIG.

[0076] In step S101, data on the correlation between the crushing strength of each of the crushers 20A to 20C, which has been measured in advance, and the particle size of the coal crushed by the crushers 20A to 20C is stored in the storage unit .

[0077] In 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.

[0078] In step S103, the pulverizers 20A to 20C pulverize the coal with the calculated pulverizing strength.

[0079] In 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 sizes of the coal detected by the sensors 30A-30C, and determines whether the calculated particle size is the target particle size. At this time, the control device 40 may determine that the calculated particle size is the target particle size when the difference between the calculated particle size and the target particle size is within a predetermined range.

[0080] If the determination in step S104 is Yes, the control device 40 ends the process. If the determination in step S104 is No, the control device 40 proceeds to step S105.

[0081] In step S105, the control device 40 determines whether or not any of the crushers 20A to 20C is malfunctioning.

[0082] 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.

[0083] In 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.

[0084] (Example) 6 is a diagram showing an example of ideal particle size distribution compared to actual particle size distribution. Graph 301 shows the ideal particle size distribution. Graph 302 shows the actual particle size distribution.

[0085] In this embodiment, the target particle size distribution is set to a particle size distribution in which the weight ratio of coal particles with a particle size of 3 mm or less is 75%±3%. This particle size distribution corresponds to graph 301.

[0086] When the coal pulverizer 1 was operated, it was confirmed that the hammer of one of the pulverizers 20 had worn out, and coarse particles with a particle size of 6 mm or more remained. The particle size distribution at this time is shown in graph 302.

[0087] Here, control was performed to change the crushing intensity of the pulverizers 20 other than the pulverizer 20 in which the hammers were worn out, so as to reduce the weight ratio of coarse particles having a particle size of 6 mm or more by 3.6%. As a result, the weight ratio of coarse particles contained in the coal charged to the coke oven 3 decreased, and the particle size of the coal charged to the coke oven 3 approached the initial target particle size.

[0088] As described above, in the coal pulverization method and coal pulverization apparatus 1 according to the present embodiment, the control device 40 adjusts the pulverization strength of the multiple pulverizers 20 for each pulverizer 20 based on the particle size of the coal detected by the sensor 30 so that the particle size of the coal that is pulverized by the multiple pulverizers 20 and then joined together becomes the target particle size. In this way, the control device 40 adjusts the pulverization strength of the multiple pulverizers 20 one by one based on the particle size of the coal detected by the sensor 30 so that the particle size of the coal charged into the coke oven 3 becomes the target particle size. Therefore, even if one of the multiple pulverizers 20 is malfunctioning, the pulverization strength of the pulverizers 20 can be adjusted one by one for each pulverizer 20 so that the particle size of the coal charged into the coke oven 3 becomes the target particle size. Therefore, according to the coal pulverization method and coal pulverization apparatus 1 according to the present embodiment, even if one of the multiple pulverizers 20 is malfunctioning, the coal can be pulverized to the target particle size.

[0089] Furthermore, in the coal pulverization method and coal pulverization apparatus 1 according to this embodiment, when a pulverizer 20 is malfunctioning, the control device 40 changes the pulverization strength of the pulverizers 20 other than the malfunctioning pulverizer 20 so that the particle size of the coal that has been pulverized by the multiple pulverizers 20 and then joined together becomes the target particle size. In this way, by changing the pulverization strength of the pulverizers 20 other than the malfunctioning pulverizer 20, according to the coal pulverization method and coal pulverization apparatus 1 according to this embodiment, it is possible to pulverize coal to the target particle size even if there is a malfunctioning pulverizer 20.

[0090] The present disclosure is not limited to the above-described embodiments. For example, multiple blocks shown in the block diagram may be integrated, or one block may be divided. Instead of executing multiple steps shown in the flowchart in chronological order as described, each step may be executed in parallel or in a different order depending on the processing capacity of the device executing each step, or as necessary. Other modifications are possible without departing from the spirit of the present disclosure. [Explanation of symbols]

[0091] 1 Coal crushing equipment 2. Coal Yard 3. Coke oven 10 Blending tank 20 Crusher 30 Sensors 40 Control device 41 Control section 42 Input section 43 Output section 44 Storage section 45 Communications Department 50 Controller

Claims

1. A coal pulverization method in a coal pulverization device that pulverizes coal transported by a plurality of conveyors, comprising: The coal pulverizing device includes at least one blending tank, a pulverizer, and a sensor arranged along each of the plurality of conveyors; The coal crushing method includes the steps of: the at least one blending vessel cutting a predetermined amount of coal; The pulverizer pulverizes the cut coal; The sensor detects the particle size of the pulverized coal; adjusting the crushing strength of each of the plurality of crushers based on the particle size of the coal detected by the sensor so that the particle size of the coal that has been crushed by the plurality of crushers and then joined together becomes a target particle size; Including, The step of adjusting the crushing strength of each of the plurality of crushers includes: determining whether any of the plurality of pulverizers is malfunctioning based on the particle size of the coal detected by the sensor; When any pulverizer is malfunctioning, changing the pulverization strength of the pulverizers other than the malfunctioning pulverizer so that the particle size of the coal that has been pulverized by the multiple pulverizers and then joined together becomes a target particle size; A method for crushing coal, comprising:

2. The method for pulverizing coal according to claim 1 , wherein the pulverizer is a hammer type pulverizer.

3. The method for pulverizing coal according to claim 2 , wherein the pulverizing strength of the pulverizer is adjusted by the rotation speed of the hammer.

4. A method for producing coal for coke, comprising producing coal for coke using the coal crushing method according to claim 1.

5. A coal pulverizing device for pulverizing coal transported by a plurality of conveyors, At least one blending tank, a grinder, and a sensor are disposed along each of the plurality of conveyors, The coal pulverizer further comprises a control device, The at least one blending vessel cuts a predetermined amount of coal; The pulverizer pulverizes the cut coal, The sensor detects the particle size of the pulverized coal; The control device determines whether any of the multiple pulverizers is malfunctioning based on the particle size of the coal detected by the sensor, and if any of the pulverizers is malfunctioning, changes the crushing strength of the pulverizers other than the malfunctioning pulverizer so that the particle size of the coal that is crushed by the multiple pulverizers and then combined becomes a target particle size.

Images