Raw material discharge control device and raw material charging device

Abstract

The raw material discharge control device (10) controls the discharge amount of the raw material (203) discharged from the raw material hopper (20). A raw material discharge control device (10) is provided with: a raw material property measurement device (12) for measuring the property value of a raw material (203) to be charged into a raw material hopper (20); and a control device (11) that controls the discharge amount of the raw material (203) on the basis of the property value of the raw material (203).

Description

Technical Field

[0001] The present disclosure relates to a raw material discharge control device and a raw material charging device. Background Art

[0002] In the manufacturing process using raw materials such as minerals, the raw materials are discharged from the raw material hopper that temporarily stores the raw materials. At this time, the amount of raw materials discharged from the raw material hopper affects the productivity, so it is important to control the discharge amount of the raw materials.

[0003] For example, in a blast furnace, raw materials discharged from a raw material hopper are charged into the furnace through a swirl chute. The charged raw materials are accumulated in the furnace to form a certain accumulation shape. This accumulation shape has a great influence on the condition in the furnace, so if the discharge amount of raw materials changes over time, the condition in the furnace may deteriorate.

[0004] Therefore, various techniques for controlling the discharge amount of the raw material from the raw material hopper to be constant have been studied.

[0005] For example, there is a known technique for controlling the discharge amount of raw materials to be constant by keeping the opening of the raw material hopper constant. However, due to the raw material segregation of the raw materials in the raw material hopper and the change of the properties of the raw materials in the raw material hopper, i.e., particle size, shape, moisture, surface state, etc., the discharge amount of the raw materials changes over time even if the opening of the raw material hopper is kept constant. In addition, the value of the raw material property is calculated at a frequency of about once a week through a small amount of batch sampling and sieve analysis, so it is difficult to capture the temporal change of the raw material property in a short period of time.

[0006] For example, Patent Document 1 discloses a technique in which, in order to control the discharge amount of raw materials from a raw material hopper to be constant, the actual values ​​of the opening of the raw material hopper and the raw material discharge speed are always calculated, and the opening of the raw material hopper is adjusted so as to achieve a target raw material discharge speed.

[0007] Patent Document 1: Japanese Patent Application Laid-Open No. 4-198412

[0008] The technology disclosed in Patent Document 1 always calculates the relationship between the opening of the raw material hopper and the actual value of the raw material discharge speed to control the opening of the raw material hopper. However, the properties of the raw materials in the raw material hopper change all the time. Therefore, even if the relationship between the opening of the raw material hopper and the actual value of the raw material discharge speed is calculated, when the calculated relationship is applied to control the opening of the raw material hopper, the properties of the raw materials may have changed, making it difficult to control the discharge amount of the raw materials to a desired discharge amount with high accuracy. Summary of the invention

[0009] An object of the present disclosure is to provide a raw material discharge control device and a raw material charging device that can control the discharge amount of a raw material discharged from a raw material hopper with high accuracy even if the properties of the raw material vary.

[0010] [1] A raw material discharge control device for controlling the discharge amount of a raw material discharged from a raw material hopper, comprising:

[0011] a raw material property measuring device for measuring a property value of the raw material to be charged into the raw material hopper; and

[0012] The control device controls the discharge amount of the above-mentioned raw material based on the property value of the above-mentioned raw material.

[0013] [2] A raw material discharge control device according to [1] above, wherein:

[0014] The property value of the raw material includes at least one of the particle size, shape, moisture content and surface state of the raw material.

[0015] [3] A raw material discharge control device according to [1] or [2], wherein:

[0016] The control device controls the discharge amount of the raw material by adjusting the opening of a flow regulating gate, and the flow regulating gate can control the discharge amount of the raw material discharged from the raw material hopper.

[0017] [4] A raw material discharge control device according to any one of [1] to [3] above, wherein:

[0018] The control device changes the discharge amount of the raw material when a value calculated based on at least one of the property values ​​of the raw material exceeds a preset threshold value.

[0019] [5] A raw material charging device, wherein:

[0020] The raw material discharge control device according to any one of [1] to [4] is used to control the discharge amount of the raw material and charge the raw material into a blast furnace.

[0021] According to the raw material discharge control device and the raw material charging device according to the present disclosure, even if the properties of the raw material vary, the discharge amount of the raw material discharged from the raw material hopper can be controlled with high accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a diagram schematically showing a configuration example of a raw material charging device including a raw material discharge control device according to an embodiment of the present disclosure.

[0023] Figure 2 Yes Figure 1 A magnified view of the area around the raw material hopper.

[0024] Figure 3 It is a diagram schematically showing a configuration example of a control device according to one embodiment of the present disclosure.

[0025] Figure 4A This is a diagram showing an example in which an estimated value of a discharge speed of a raw material is compared with an actual value.

[0026] Figure 4B This is a diagram showing an example in which an estimated value of a discharge speed of a raw material is compared with an actual value.

[0027] Figure 4C This is a diagram showing an example in which an estimated value of a discharge speed of a raw material is compared with an actual value.

[0028] Figure 4D This is a diagram showing an example in which an estimated value of a discharge speed of a raw material is compared with an actual value.

[0029] Figure 4E This is a diagram showing an example in which an estimated value of a discharge speed of a raw material is compared with an actual value.

[0030] Figure 5 This is an example showing the temporal changes of various data.

[0031] Fig. 6A This is a diagram showing an example in which an estimated value of the amount of change in the discharge speed of a raw material is compared with an actual value.

[0032] Figure 6B This is a diagram showing an example in which an estimated value of the amount of change in the discharge speed of a raw material is compared with an actual value. DETAILED DESCRIPTION

[0033] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0034] Figure 1 : is a diagram schematically showing a configuration example of a raw material charging device 1 including a raw material discharge control device 10 according to an embodiment of the present disclosure. Figure 2 Yes Figure 1 An enlarged view of the vicinity of the raw material hopper 20. Figure 1 and Figure 2 The raw material charging device 1 and the raw material discharge control device 10 will be described.

[0035] The raw material charging device 1 is a device for charging the raw material 203 conveyed by the raw material charging conveyor 202 into the furnace of the blast furnace 201 .

[0036] The raw material charging device 1 includes a raw material discharge control device 10, a raw material hopper 20, a flow rate regulating gate 30, and a swirl chute 40. The raw material charging device 1 controls the discharge amount of the raw material 203 discharged from the raw material hopper 20 using the raw material discharge control device 10, and charges the raw material 203 into the blast furnace 201.

[0037] In addition, in this embodiment, the case where the raw material discharge control device 10 is used in the raw material charging device 1 that charges the raw material 203 transported by the conveyor 202 into the blast furnace 201 is described as an example, but the process using the raw material discharge control device 10 is not limited to this. The raw material discharge control device 10 can be used in any process that charges the raw material 203 using the raw material hopper 20.

[0038] The raw material 203 is, for example, coke, but is not limited thereto, and may be, for example, ore, sintered ore, pellets, limestone, rock, concrete raw material, powder, or the like.

[0039] The raw material discharge control device 10 controls the discharge amount of the raw material 203 discharged from the raw material hopper 20. The raw material discharge control device 10 includes a control device 11 and a raw material property measuring device 12. The structure and function of the raw material discharge control device 10 will be described in detail later.

[0040] The raw material hopper 20 temporarily stores the raw material 203 conveyed by the conveyor 202 . The raw material hopper 20 can discharge the stored raw material 203 into the blast furnace 201 .

[0041] The flow regulating gate 30 can control the discharge amount of the raw material 203 discharged from the raw material hopper 20. The flow regulating gate 30 is a gate whose opening can be adjusted. If the opening of the flow regulating gate 30 is increased, the discharge amount of the raw material 203 discharged from the raw material hopper 20 increases. If the opening of the flow regulating gate 30 is reduced, the discharge amount of the raw material 203 discharged from the raw material hopper 20 decreases. The opening of the flow regulating gate 30 is controlled by the control device 11.

[0042] The swirl chute 40 is installed in the upper part of the blast furnace 201. The swirl chute 40 swirls at a predetermined speed. The raw material 203 discharged from the raw material hopper 20 is charged into the furnace of the blast furnace 201 through the swirl chute 40.

[0043] Next, the control device 11 and the material property measuring device 12 included in the material discharge control device 10 will be described.

[0044] The control device 11 obtains the property value of the raw material 203 measured by the raw material property measuring device 12. Here, the property value of the raw material 203 measured by the raw material property measuring device 12 is the property value of the raw material 203 conveyed by the conveyor 202, and is the property value of the raw material 203 before being loaded into the raw material hopper 20.

[0045] The control device 11 controls the discharge amount of the raw material 203 discharged from the raw material hopper 20 based on the property value of the raw material 203 obtained from the raw material property measuring device 12. The control device 11 controls the discharge amount of the raw material 203 discharged from the raw material hopper 20 by adjusting the opening of the flow regulating gate 30.

[0046] Figure 3 1 is a diagram schematically showing an example of the configuration of a control device 11 according to an embodiment of the present disclosure. The control device 11 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 11 of the raw material discharge control device 10. Figure 3 The configuration of the control device 11 will be described.

[0047] The control device 11 includes a control unit 111 , an input unit 112 , an output unit 113 , a storage unit 114 , and a communication unit 115 .

[0048] The control unit 111 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 customized for specific processing. The dedicated circuit is, for example, an FPGA (Field-Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit).

[0049] The control unit 111 reads the program, data, etc. stored in the storage unit 114 and executes various functions. The control unit 111 controls the flow rate regulating gate 30 .

[0050] The input unit 112 includes one or more input interfaces for detecting user input and acquiring input information based on user operation. The input unit 112 includes, for example, physical keys, electrostatic capacitance keys, a touch screen integrated with the display of the output unit 113, or a microphone for receiving voice input.

[0051] The output unit 113 includes one or more output interfaces for outputting information and notifying the user. The output unit 113 includes, for example, a display that outputs information using images, a speaker that outputs information using sounds, etc. The display included in the output unit 113 may be, for example, an LCD (Liquid Crystal Display) or a CRT (Cathode Ray Tube) display.

[0052] The storage unit 114 is, for example, a flash memory, a hard disk, an optical storage, etc. A part of the storage unit 114 may be outside the control device 11. In this case, a part of the storage unit 114 may be a hard disk, a memory card, etc. connected to the control device 11 via any interface.

[0053] The storage unit 114 stores programs for the control unit 111 to execute various functions, data used by the programs, and the like.

[0054] The communication unit 115 includes at least one of a communication module corresponding to wired communication and a communication module corresponding to wireless communication. The control device 11 can communicate with other devices via the communication unit 115 .

[0055] Refer again Figure 1 and Figure 2 Provide explanation.

[0056] The material property measuring device 12 measures the property value of the material 203 conveyed by the conveyor 202. That is, the material property measuring device 12 measures the property value of the material 203 before being charged into the material hopper 20.

[0057] The property value measured by the raw material property measuring device 12 includes at least one of the particle size, shape, moisture content, and surface state of the raw material 203 .

[0058] Here, the significance of the raw material property measuring device 12 measuring the particle size, shape, moisture content, and surface state of the raw material 203 as the property values ​​of the raw material 203 will be described.

[0059] First, the particle size of the raw material 203 is described. If the particle size of the raw material 203 is reduced, the friction between the raw materials 203 is reduced. As a result, the fluidity of the raw material 203 is increased, and it is considered that even if the opening of the flow regulating gate 30 is the same, the discharge speed of the raw material 203 discharged from the raw material hopper 20 is also increased. In this way, the particle size of the raw material 203 affects the discharge speed of the raw material 203 discharged from the raw material hopper 20.

[0060] Next, the shape of the raw material 203 is described. If the shape of the raw material 203 is angular, it is considered that the discharge speed of the raw material 203 discharged from the raw material hopper 20 will be slowed down even if the opening degree of the flow rate adjustment gate 30 is the same. In this way, the shape of the raw material 203 affects the discharge speed of the raw material 203 discharged from the raw material hopper 20.

[0061] Next, the water content of the raw material 203 will be described. If the water content of the raw material 203 increases, the density of the raw material 203 increases, and the friction of the surface of the raw material 203 decreases. Therefore, it is considered that even if the opening of the flow rate adjustment gate 30 is the same, the discharge speed of the raw material 203 discharged from the raw material hopper 20 becomes faster. In this way, the water content of the raw material 203 affects the discharge speed of the raw material 203 discharged from the raw material hopper 20.

[0062] Next, the surface state of the raw material 203 is described. The factors affecting the surface state of the raw material 203 include the roughness of the surface itself, the amount of moisture attached to the surface, the amount of powder on the surface, etc. Due to the change of these influencing factors, the friction of the raw material 203 changes, and thus the discharge speed of the raw material 203 discharged from the raw material hopper 20 changes. In this way, the surface state of the raw material 203 affects the discharge speed of the raw material 203 discharged from the raw material hopper 20.

[0063] As such, the particle size, shape, moisture content, and surface state of the raw material 203 as the property values ​​of the raw material 203 affect the discharge speed of the raw material 203 discharged from the raw material hopper 20. Therefore, the raw material property measuring device 12 measures the property values ​​such as the particle size, shape, moisture content, and surface state of the raw material 203, and the control device 11 controls the discharge amount of the raw material 203 discharged from the raw material hopper 20 based on the property values ​​of the raw material 203, thereby being able to control the discharge amount of the raw material 203 with high accuracy.

[0064] The material property measuring device 12 includes a distance measuring device, an image measuring device, and a moisture measuring device. In addition, the material property measuring device 12 may include either a distance measuring device or an image measuring device instead of both the distance measuring device and the image measuring device.

[0065] The distance measuring device and the image measuring device can measure the particle size, shape, and surface state of the raw material 203. The moisture measuring device can measure the moisture content of the raw material 203.

[0066] The distance measuring device may be, for example, a two-dimensional laser distance meter. The laser distance meter irradiates a laser beam in a linear manner along the width direction of the conveyor 202, and measures the distance to the target raw material 203 for each line.

[0067] At this time, the raw material 203 to be measured is in a state of being accumulated on the conveyor 202 and is moved by the conveyor 202. The laser distance meter measures the distance to the raw material 203 linearly at a certain period. The laser distance meter can generate three-dimensional shape data of the raw material 203 by accumulating the measured values ​​of the distance of each line.

[0068] The above-mentioned method of generating three-dimensional shape data by a laser range finder is a method of generating three-dimensional shape data by a so-called light section method. The laser range finder can measure the particle size, shape, and surface state of the raw material 203 based on the three-dimensional shape data.

[0069] The distance measuring device may be, for example, a time-of-flight camera or a stereo camera, and may generate three-dimensional shape data.

[0070] The image measuring device can measure the two-dimensional image data of the raw material using an industrial camera. In order to identify the multiple particles contained in the measured image data as individual particles, the image measuring device can perform particle separation processing based on a processing method called WaterShed algorithm disclosed in Document 1 (Document 1: Meyer, F. (1992). Color image segmentation. In Proceedings of the International Conference on Image Processing and its Applications, pages 303-306).

[0071] The image measuring device may calculate the particle size of the raw material 203 by averaging the diameters of the individual particles obtained by image processing, for example.

[0072] Various definitions can be used as the definition of the particle size. For example, equivalent circle diameter, major diameter, minor diameter, Feret diameter, etc. can be used as the definition of the particle size.

[0073] The image measuring device can calculate the shape of each particle by recognizing each particle of the raw material 203. The image measuring device can also calculate the shape of the raw material 203 by averaging the shapes of the individual particles.

[0074] The shape of the particle can be defined in various ways. For example, roundness, envelope, solidity, etc. can be used as the definition of the shape of the particle.

[0075] Distance measuring devices such as laser rangefinders can calculate surface roughness as one of the surface conditions. There are various methods for calculating surface roughness, for example, common indicators such as Ra and Rz can be used. The method for calculating surface roughness is not limited to this, and all indicators related to the degree of concavity and convexity that affect friction can be used. Regarding the amount of powder, the weight ratio of the fine particle part obtained by particle size measurement, for example, the weight ratio of the particle size data at 5 mm can be used as an indicator.

[0076] The moisture measuring device may be, for example, a neutron moisture meter or an infrared moisture meter.

[0077] The neutron moisture meter irradiates neutrons from a neutron beam source. A portion of the irradiated neutrons passes through the raw material 203, and a portion is reflected according to the moisture in the raw material 203. The neutron moisture meter can detect the reflected neutrons and calculate the moisture value based on the reflected amount.

[0078] The infrared moisture meter can measure the moisture content by using an infrared wavelength that is sensitive to moisture absorption. The infrared moisture meter can irradiate the raw material 203 with infrared rays and calculate the moisture value based on the degree of absorption.

[0079] The control unit 111 of the control device 11 acquires the property value of the raw material 203 measured by the raw material property measuring device 12 via the communication unit 115 .

[0080] The control unit 111 controls the discharge amount of the raw material 203 discharged from the raw material hopper 20 based on the property value obtained from the raw material property measuring device 12. The control unit 111 can control the discharge amount of the raw material 203 by adjusting the opening of the flow regulating gate 30.

[0081] The control unit 111 can estimate the discharge speed of the raw material 203 discharged from the raw material hopper 20 based on the flow rate adjustment gate 30 and the property value of the raw material 203. The control unit 111 can control the discharge amount of the raw material 203 so that the discharge speed of the raw material 203 discharged from the raw material hopper 20 is within a predetermined range. The discharge speed can be defined, for example, by the weight of the raw material 203 discharged per rotation of the swirl chute 40. Alternatively, the discharge speed can be defined, for example, by the weight of the raw material 203 discharged per unit time.

[0082] The storage unit 114 may store coefficients when the discharge speed of the raw material 203 discharged from the raw material hopper 20 is estimated using the opening of the flow regulating gate 30 and the property value of the raw material 203 as explanatory variables. The coefficient may be a coefficient calculated by multivariate regression analysis based on the actual value measured in advance. When the property value of the raw material 203 includes multiple values ​​such as particle size, shape, moisture, and surface state, the storage unit 114 may store coefficients when the discharge speed of the raw material 203 is estimated using each value as an explanatory variable.

[0083] When the value calculated based on at least one value of the property value of the raw material 203 obtained from the raw material property measuring device 12 exceeds a preset threshold value, the control unit 111 can change the discharge amount of the raw material 203 discharged from the raw material hopper 20. Thus, when the property value of the raw material 203 deviates significantly from the normal value, the control unit 111 can adjust the opening of the flow regulating gate 30 to control the discharge speed of the raw material 203 within a prescribed range. When the property value of the raw material 203 includes multiple values ​​of particle size, shape, moisture, and surface state, a threshold value can be set for each value. When the value calculated based on at least one value of the property value of the raw material 203 exceeds the threshold value, the control unit 111 can change the discharge amount of the raw material 203 discharged from the raw material hopper 20.

[0084] The threshold value may be a value determined based on a preliminary investigation of the property value of the raw material 203 at a discharge speed that becomes a problem in the operation of the blast furnace 201 . The threshold value may be stored in the storage unit 114 .

[0085] Alternatively, if the property value of the raw material 203 is obtained from the raw material property measuring device 12, the control unit 111 estimates the discharge speed of the raw material 203, and when the estimated discharge speed is not within the specified range, the opening of the flow regulating gate 30 is controlled so that the discharge speed of the raw material 203 is within the specified range. In this way, the control unit 111 can control the discharge amount of the raw material 203 with higher accuracy.

[0086] (Example)

[0087] Figure 4A to Figure 4E This is a diagram showing an example in which an estimated value of the discharge speed is compared with an actual value of the discharge speed. Figure 4A to Figure 4E The horizontal axes of the five graphs shown are estimated values ​​of the discharge speed of the raw material 203 calculated by the control device 11. In addition, the vertical axes are actual values ​​of the discharge speed when the raw material 203 is actually charged into the blast furnace 201.

[0088] Figure 4A This is a graph showing a case where the discharge speed of the raw material 203 is estimated based only on the opening degree of the flow rate regulating gate 30 without considering the property value of the raw material 203 as a comparative example. Figure 4B This is a graph for estimating the discharge speed of the raw material 203 based on the opening degree of the flow rate regulating gate 30 and the water content of the raw material 203 as a property value of the raw material 203 . Figure 4C This is a graph for estimating the discharge speed of the raw material 203 based on the opening degree of the flow rate regulating gate 30 and the particle diameter of the raw material 203 as a property value of the raw material 203 . Figure 4DThis is a graph for estimating the discharge speed of the raw material 203 based on the opening degree of the flow rate regulating gate 30 and the particle size and water content of the raw material 203 as property values ​​of the raw material 203 . Figure 4E This is a graph for estimating the discharge speed of the raw material 203 based on the opening degree of the flow rate regulating gate 30 and the particle size, water content, and shape of the raw material 203 as property values ​​of the raw material 203 .

[0089] observe Figure 4A When the discharge speed is estimated based only on the opening of the flow regulating gate 30, the coefficient R 2 is 0.31. In contrast, Figure 4B When the discharge rate is estimated based on the opening of the flow control gate 30 and the water content as the property value of the raw material 203, the determination coefficient is 0.41. Figure 4C , when the discharge speed is estimated based on the opening of the flow regulating gate 30 and the particle size as the property value of the raw material 203, the determination coefficient is 0.39. In this way, by estimating the discharge speed taking into account the moisture content or the particle size as the property value, the control device 11 can estimate the discharge speed of the raw material 203 with high accuracy.

[0090] In addition, observe Figure 4D , when the discharge speed is estimated based on the opening of the flow regulating gate 30 and the particle size and water content as the property values ​​of the raw material 203, the determination coefficient is 0.46. In this way, by estimating the discharge speed taking into account the particle size and water content as the property values, the control device 11 can estimate the discharge speed of the raw material 203 with higher accuracy.

[0091] In addition, observe Figure 4E , when the discharge speed is estimated based on the opening of the flow regulating gate 30 and the particle size, water content, and shape as the property values ​​of the raw material 203, the determination coefficient is 0.60. In this way, by estimating the discharge speed by considering the three values ​​of particle size, water content, and shape as the property values, the control device 11 can estimate the discharge speed of the raw material 203 with higher accuracy.

[0092] Figure 4A to Figure 4E The results show that the control device 11 can estimate the discharge speed of the raw material 203 with high accuracy by considering the property value of the raw material 203. The control device 11 can control the discharge amount of the raw material 203 based on the discharge speed of the raw material 203 estimated with high accuracy in this way.

[0093] in addition, Figure 4A to Figure 4EThe result shows that if multiple values ​​are considered as the property value of the raw material 203, the control device 11 can estimate the discharge speed of the raw material 203 with higher accuracy. In addition, in this embodiment, as the value calculated based on at least one value of the property value of the raw material 203, the absolute value of the property value is used.

[0094] Figure 5 1 is an example of showing the time variation of various data. The top graph is a graph showing the time variation of the particle size of the raw material 203. The second graph is a graph showing the time variation of the opening of the flow regulating gate 30. The bottom graph is a graph showing the discharge speed of the raw material 203.

[0095] exist Figure 5 In the embodiment, at the timing indicated by the mark 403, the material discharge control device 10 of the present embodiment starts the process of controlling the discharge amount of the material 203. That is, before the timing indicated by the mark 403, the process of controlling the discharge speed of the material 203 based on the property value of the material 203 is not performed.

[0096] Reference Figure 5 At the timing indicated by mark 401, the particle size of the raw material 203 decreases. Along with this, as indicated by mark 402, the discharge speed of the raw material 203 increases sharply. Such an increase in the discharge speed of the raw material 203 has an adverse effect on the operation of the blast furnace 201.

[0097] Reference Figure 5 , at the timing shown by mark 404, the particle size of the raw material 203 decreases again. At this time, the particle size of the raw material 203 is lower than the threshold value 407. Therefore, as shown by mark 405, the raw material discharge control device 10 implements control to reduce the opening of the flow adjustment gate 30. As a result, the raw material discharge control device 10 can suppress the increase in the discharge speed of the raw material 203 within the time range shown by mark 406. That is, the raw material discharge control device 10 can stabilize the discharge speed of the raw material 203 by controlling the flow adjustment gate 30 based on the particle size as the property value of the raw material 203.

[0098] exist Figure 5 , the flow rate adjustment gate 30 is controlled based on the particle size of the raw material 203, but the same result can be obtained even if the flow rate adjustment gate 30 is controlled based on the shape or moisture of the raw material 203. In addition, the same result can be obtained even if the flow rate adjustment gate 30 is controlled based on multiple property values ​​of the raw material 203.

[0099] As described above, the raw material discharge control device 10 according to the present embodiment includes: the raw material property measuring device 12 for measuring the property value of the raw material 203 charged into the raw material hopper 20; and the control device 11 for controlling the discharge amount of the raw material 203 based on the property value of the raw material 203. In this way, the control device 11 controls the discharge amount of the raw material 203 based on the property value of the raw material 203, thereby the raw material discharge control device 10 according to the present embodiment can control the discharge amount of the raw material 203 discharged from the raw material hopper 20 with high accuracy even if the property of the raw material 203 changes.

[0100] In addition, the raw material charging device 1 according to the present embodiment uses the raw material discharge control device 10 to control the discharge amount of the raw material 203, and charges the raw material 203 into the furnace of the blast furnace 201. Therefore, the raw material charging device 1 according to the present embodiment can control the distribution shape of the raw material 203 accumulated in the furnace of the blast furnace 201 with high accuracy, thereby stabilizing the operation of the blast furnace 201.

[0101] In addition, in the present embodiment, although the operation is for the lower limit value, the discharge speed can also be controlled with higher accuracy by setting thresholds for the upper and lower limits of each raw material property index. In addition, in addition to the operation based on absolute values, thresholds based on relative values ​​representing time changes can also be used. In this case, since the sensor value is used, the sensor needs to be regularly calibrated to the true value during the operation. However, since the calibration becomes a load on the operation, it is difficult to increase the calibration frequency. In this case, there is a possibility that the sensor deviates from the true value, resulting in false detection and undetected values. In this regard, the relative change is less likely to deviate than the absolute value. In the case of long-term operation, there is a situation where relative changes are used to become a stable threshold operation. Fig. 6A This is the result of inference using only the difference in opening degree. Figure 6B It is the result of predicting the difference in discharge speed using the difference in particle size, moisture, and opening. Fig. 6A , coefficient of determination R 2 is 0.57. Figure 6B , coefficient of determination R 2 The coefficient R is determined by adding the particle size and water content to the prediction. 2The accuracy is improved to 0.64, indicating that particle size and moisture are useful even in relative change prediction. Thus, the discharge change can be predicted, and large changes can be suppressed in the same way by setting a threshold for the discharge change prediction value, and the discharge can be brought close to the appropriate target value by appropriate opening adjustment. In the present invention, coke is transported at a constant amount and loaded into the silo in batches, so the change uses the difference between the current loading batch and the previous loading batch, but is not limited to this. As an indicator of the change, for example, the change within a certain time from the current moment based on time, or the maximum change can also be used.

[0102] The present disclosure is not limited to the above-mentioned embodiments. For example, multiple blocks recorded in the block diagram may be merged, or one block may be divided. Instead of executing multiple steps recorded in the flowchart in a time series according to the description, multiple steps recorded in the flowchart may be executed in parallel or in a different order according to the processing capacity of the device executing each step or as needed. In addition, changes may be made within the scope of the subject matter of the present disclosure.

[0103] For example, in the above-mentioned embodiment, the case where the raw material property measuring device 12 includes a distance measuring device, an image measuring device, and a moisture measuring device is taken as an example for explanation. However, the devices included in the raw material property measuring device 12 are not limited to these. The raw material property measuring device 12 may also include any device capable of measuring the property value of the raw material 203.

[0104] For example, in the above-mentioned embodiment, a part of the processing operations executed in the raw material property measuring device 12 may also be executed in the control device 11. For example, when the raw material property measuring device 12 includes an image measuring device, the image measuring device may capture an image of the raw material 203, and the control device 11 may analyze the image of the raw material 203 captured by the image measuring device to calculate the particle size and shape as the property value of the raw material 203.

[0105] For example, in the above-mentioned embodiment, the discharge amount of the raw material 203 is controlled by adjusting the opening of the flow regulating gate 30, but the mechanism for controlling the discharge amount of the raw material 203 is not limited thereto. The raw material discharge control device 10 may also control the discharge amount of the raw material 203 using a device other than the flow regulating gate 30.

[0106] For example, in the above-mentioned embodiment, the case where the raw material discharge control device 10 controls the discharge amount of the raw material 203 charged into the blast furnace 201 is taken as an example for explanation, but the field in which the raw material discharge control device 10 can be used is not limited to the field of steel production. The raw material discharge control device 10 can also be used in other fields of conveying raw materials.

[0107] Description of Reference Numerals

[0108] 1…Raw material charging device; 10…Raw material discharging control device; 11…Control device; 12…Raw material property measuring device; 20…Raw material hopper; 30…Flow rate regulating gate; 40…Swirl chute; 111…Control unit; 112…Input unit; 113…Output unit; 114…Storage unit; 115…Communication unit; 201…Blast furnace; 202…Conveyor; 203…Raw material.

Claims

1. A raw material discharge control device for controlling the discharge amount of raw materials discharged from a raw material hopper, characterized in that: have: a raw material property measuring device for measuring a property value of the raw material to be charged into the raw material hopper; and The control device controls the discharge amount of the raw material based on the property value of the raw material.

2. The raw material discharge control device according to claim 1, characterized in that: The property value of the raw material includes at least one of the particle size, shape, moisture and surface state of the raw material.

3. The raw material discharge control device according to claim 1, characterized in that: The control device controls the discharge amount of the raw material by adjusting the opening of a flow regulating gate, and the flow regulating gate can control the discharge amount of the raw material discharged from the raw material hopper.

4. The raw material discharge control device according to claim 1, characterized in that: The control device changes the discharge amount of the raw material when a value calculated based on at least one of the property values ​​of the raw material exceeds a preset threshold value.

5. A raw material loading device, characterized in that: The raw material discharge control device according to any one of claims 1 to 4 is used to control the discharge amount of the raw material and charge the raw material into the blast furnace.

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