CN111041194A - Preparation device for improving green pellet quality of mineral powder pellets and application method thereof - Google Patents
Preparation device for improving green pellet quality of mineral powder pellets and application method thereof Download PDFInfo
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- 239000008188 pellet Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000000843 powder Substances 0.000 title claims abstract description 12
- 229910052500 inorganic mineral Inorganic materials 0.000 title claims abstract description 9
- 239000011707 mineral Substances 0.000 title claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000002245 particle Substances 0.000 claims abstract description 19
- 238000009826 distribution Methods 0.000 claims abstract description 11
- 238000012545 processing Methods 0.000 claims description 11
- 238000005507 spraying Methods 0.000 claims description 11
- 230000005540 biological transmission Effects 0.000 claims description 10
- 230000008054 signal transmission Effects 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- 238000005453 pelletization Methods 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 5
- 230000007246 mechanism Effects 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 230000011218 segmentation Effects 0.000 description 4
- 238000005070 sampling Methods 0.000 description 3
- 238000011217 control strategy Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/08—Measuring arrangements characterised by the use of optical techniques for measuring diameters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/2408—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures for measuring roundness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0205—Investigating particle size or size distribution by optical means
- G01N15/0227—Investigating particle size or size distribution by optical means using imaging; using holography
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/13—Edge detection
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/60—Analysis of geometric attributes
- G06T7/62—Analysis of geometric attributes of area, perimeter, diameter or volume
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Abstract
The invention discloses a preparation device for improving the green ball quality of mineral powder pellet ore, which comprises components such as an on-site electrical control box, an industrial control computer, an information input device, a display, an interface card, a light source, an industrial intelligent camera, a disc pelletizer, a conveying belt and the like. The device shoots pellet particles on the conveying belt in real time, analyzes and processes shot pictures to obtain the distribution condition of the pellet particles, and finally adjusts relevant operating mechanisms (the opening time of the water adding valve, the disc inclination angle and the disc rotating speed) of the disc pelletizer according to the distribution condition, so that the purpose of optimizing the green pellet quality is achieved.
Description
Technical Field
The invention relates to equipment in the metallurgical industry, in particular to a preparation device for improving the green ball quality of mineral powder pellets and a using method thereof.
Background
Modern steel industry has been required to gradually differentiate the extensive production and operation mode from the prior art and to switch to a high-quality, energy-saving and environment-friendly development path. The pellet ore is adopted in the blast furnace smelting process, so that the sufficiency of raw material combustion can be effectively improved, the energy loss in the production process is reduced, and the slag residue is reduced.
An important index for determining the green pellet quality of the pellet ore is the granularity of the pellet ore, and the traditional screening method mostly adopts manual discrimination and sampling identification. The manual judging method needs workers to manually adjust the valve of the water spraying device according to the on-site green state, and has the defects of subjective judgment standard, lag judgment opportunity, large judgment error and the like; and the sampling identification method needs to build a sampling device specially, so that the detection efficiency is low, the detection cost is high, the real-time performance is poor, and the like. The inclination angle and the rotating speed of the disc pelletizer in the traditional process cannot be dynamically adjusted, and the target effect cannot be well achieved by independently adjusting the water adding amount.
Disclosure of Invention
The invention aims to solve the technical pain point in the production process, introduces a digital image processing technology, performs image capture and analysis processing on the green pellet quality of the ore powder pellet, and improves the relevant operating parameters (including the valve opening time of a water adding device, the disc inclination angle and the disc rotating speed) of the disc pelletizer based on the processing result, thereby effectively improving the green pellet quality of the ore powder pellet, improving the production efficiency of the pellet and reducing the loss and pollution in the production process.
In order to achieve the above purpose, the specific implementation technical scheme is as follows:
improve preparation facilities of powdered ore pellet ore green ball quality, include: the device comprises an on-site electrical control box, an industrial control computer, an information input device, a display, a control signal transmission line, a water adding device valve of a disc pelletizer, disc inclination angle control of the disc pelletizer, rotating speed control of the disc pelletizer, an industrial intelligent camera, a light source, a conveying belt and the disc pelletizer.
The industrial control computer is connected with the field electric control box through a computer power line;
the information input device may be a keyboard, a mouse, or the like. The information input device and the display are connected with the industrial control computer through data connecting lines; the industrial control computer is connected with a water adding device valve of the disc pelletizer, disc inclination angle control of the disc pelletizer and rotating speed control of the disc pelletizer through a control signal transmission line;
the light source is arranged near the industrial intelligent camera and is connected with the field electric control box through a light source power supply line; the industrial intelligent camera is connected with the field electric control box through a camera power supply line; the industrial intelligent camera is connected with the industrial control computer through a camera data connecting line;
preferably, the disc pelletizer specifically includes: pelletizer disc, triangular supports, disc scraper support, rotating transmission shaft, disc pelletizer base, triangular supports telescopic shaft, telescopic shaft rotation fulcrum, triangular supports bottom rotation fulcrum, 1# bottom scraper, side direction scraper, 2# bottom scraper, water jet equipment valve, water jet equipment support.
The base of the disc pelletizer is placed on a horizontal plane; the triangular support frame is connected with the pelletizer base through a bottom rotating fulcrum; the triangular support frame is connected with the triangular support frame telescopic shaft through a telescopic shaft rotating fulcrum; the bottom of the telescopic shaft of the triangular support frame is obliquely fixed on the base of the disc pelletizer;
the lower end of the rotating transmission shaft is fixed on the triangular support frame, and a rotating part of the rotating transmission shaft is connected with the large teeth at the bottom of the disc pelletizer through a gear;
all the installation of 1# bottom scraper, side direction scraper and 2# bottom scraper is fixed on the disc scraper support, and the water jet equipment valve is fixed on the water jet equipment support, and the water jet equipment support is fixed on the disc scraper support.
The use method of the preparation device for improving the green pellet quality of the mineral powder pellets comprises the following steps:
the method comprises the following steps: turning on a light source, and starting a camera to shoot to obtain image data;
step two: extracting ROI from the shot image;
step three: carrying out noise reduction processing on the image by using a standard termination filtering method;
step four: carrying out segmentation processing on the image by using a watershed algorithm to obtain an edge line image of the pellet;
step five: processing the edge line image to obtain the distribution condition of the circularity and radius of the pellet particles, and storing the obtained distribution condition and the current operating parameters of the disc pelletizer in a computer;
step six: the parameters such as the opening time of the water adding valve, the disc inclination angle, the disc rotating speed and the like are adjusted by combining the current pellet ore particle information distribution condition and the operation parameters of the disc pelletizer, and the specific adjustment strategy is shown in fig. 4.
Step seven: and transmitting the corrected operation parameters to the disc pelletizer through an output signal control line.
Step eight: and repeating the first step to the seventh step to control the green ball quality within a target range.
The disc inclination angle of the disc pelletizer is controlled because if the disc inclination angle is increased, the materials are more likely to collide at the bottom layer, which reduces the pelletizing granularity and the average radius of the pellet particles; conversely, if the disc inclination angle is reduced, the pelletizing granularity is increased, and the average radius of the pellet particles is increased; however, the inclination angle is not too large or too small, and too large causes the lifting height of the material to be reduced, the disk surface cannot be fully utilized, and the yield of the disk pelletizer is reduced; if the inclination angle is smaller than the repose angle of the material, a powder layer which is static relative to the bottom of the disc can be formed and moves synchronously with the disc, and the material is forced to fall by the aid of a scraper, so that the quality of green pellets is influenced. In the practical operation of the invention, the disc inclination angle is controlled within the range of 43 degrees +/-2 degrees of the reference inclination angle.
The rotating speed of the disc pelletizer is controlled because in practical application, the rotating speed n of the disc pelletizer is generally the critical rotating speed nc80% of the total weight of the material, so that the falling material can obtain larger kinetic energy and fall, and the critical rotating speed
(theta is the disc inclination angle, D is the disc diameter), so the rotating speed needs to be changed synchronously with the inclination angle, and better green ball quality can be obtained.
Has the advantages that:
the pellet particles are identified in real time, and the information of the circularity and the radius of the pellet particles is extracted, so that the response delay is reduced, and the preparation quality of the pellet is improved;
compared with a manual identification method, the method has the advantages that the influence of subjective experience of operators is eliminated, the identification precision and the identification efficiency are improved, and the traceability of pellet preparation information is improved;
compared with other methods for improving the pellet preparation quality, the method introduces two parameters of the inclination angle and the rotating speed of the disc pelletizer, and improves the possibility of preparing high-quality pellets.
Drawings
The invention has 5 drawings in total, and the specific definitions are as follows:
FIG. 1: system structure schematic diagram of the invention
FIG. 2: side view of disc pelletizer in the invention
FIG. 3: plan view of disc pelletizer in the present invention
FIG. 4: visual recognition processing flow chart in the invention
FIG. 5: picture detection flow chart of the invention
Wherein the reference symbols in fig. 1-3 are explained as follows:
1. on-site electric control box 2, industrial control computer 3, information input device 4, display
5. Computer output signal line 6, water adding device valve 7, disc inclination angle control device
8. Rotating speed control 9 of disc pelletizer, 1# light source power supply line 10 and industrial camera power supply line
11. 2# light source power supply line 12, industrial camera data connecting line 13, industrial camera 14, light source
15. Conveying belt 16, disk pelletizer 17, industrial control computer power cord
18. Pelletizer disc 19, triangular support frame 20, disc scraper support 21 and rotary transmission shaft
22. Base 23 of disk pelletizer, telescopic support rod 24 and rotary pivot of telescopic shaft
25. Triangular support frame bottom rotation fulcrum 26, No. 1 bottom scraper 27 and side scraper
28. No. 2 bottom scraper 29, water jet equipment valve 30, water jet equipment support
In fig. 4: assuming that the average radius of the pellet particles is R and the target radius is R;
the ratio of the particle radius in the range of R +/-5 mm is A
The average circularity of the pellet particles is E, and the target circularity is E;
Detailed Description
The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The preparation device for improving the green ball quality of the mineral powder pellet shown in fig. 1 comprises: the device comprises an on-site electrical control box 1, an industrial control computer 2, an information input device 3, a display 4, a control signal transmission line 5, a water adding device valve 6 of a disc pelletizer, a disc inclination angle control 7 of the disc pelletizer, a rotating speed control 8 of the disc pelletizer, an industrial intelligent camera 13, a light source 14, a conveying belt 15 and a disc pelletizer 16.
The industrial control computer 2 is connected with the field electric control box 1 through a computer power line 17;
the information input device 3 may be implemented as a keyboard, a mouse, or the like. The information input device 3 and the display 4 are both directly connected with the industrial control computer 2 through respective data connecting lines;
the industrial control computer 2 is connected with a water adding device valve 6 of the disc pelletizer, a disc inclination angle control 7 and a disc pelletizer rotating speed control 8 through a control signal transmission line 5;
the light source 14 is arranged near the industrial intelligent camera 13, and the light source 14 is connected with the on-site electric control box 1 through light source power supply lines 9 and 11;
the industrial intelligent camera 13 is connected with the field electric control box 1 through a camera power supply line 10; the industrial intelligent camera 13 is connected with the industrial control computer 2 through a camera data connecting line 12;
the pan pelletizer 16 specifically includes: pelletizer disc 18, triangular support frame 19, disc scraper support 20, rotary transmission shaft 21, disc pelletizer base 22, triangular support frame telescopic shaft 23, telescopic shaft rotary fulcrum 24, triangular support frame bottom rotary fulcrum 25, No. 1 bottom scraper 26, side scraper 27, No. 2 bottom scraper 28, water spraying device valve 29 and water spraying device support 30.
The disc pelletizer base 22 is horizontally placed on the ground; the triangular support frame 19 is connected with the disc pelletizer base 22 through a bottom rotating fulcrum 25; the triangular support frame 19 is connected with a triangular support frame telescopic shaft 23 through a telescopic shaft rotating fulcrum 24; the bottom of the triangular support frame telescopic shaft 23 is obliquely fixed on the disc pelletizer base 22;
the lower end of a rotating transmission shaft 21 is fixed on a triangular support frame, and a rotating component of the rotating transmission shaft is connected with a large tooth at the bottom of a disc 18 of a disc pelletizer through a gear;
the No. 1 bottom scraper 26, the side scraper 27 and the No. 2 bottom scraper 28 are all installed and fixed on the disc scraper support 20, the water spraying device valve 29 is fixed on the water spraying device support 30, and the water spraying device support 30 is fixed on the disc scraper support 20.
After the equipment is installed, the method comprises the following steps:
the method comprises the following steps: the light source 14 shines light into the detection zone through a small, internally highlighted LED bulb, in combination with a specular housing that reflects the light. The resolution of the industrial camera 13 installed in the center of the two high-brightness LED area light sources is 500 ten thousand pixels, the shooting frame rate is 15 frames/s, the exposure time of the industrial camera 13, the focal length of a lens, the size of an aperture and other parameters are adjusted, and a clear image of the pellet particles conveyed to the shooting area can be obtained.
Step two: after the image acquisition is finished, the image data is transmitted to the industrial control computer 2 through the industrial Ethernet, and ROI extraction is performed through image processing software running on the industrial control computer 2.
Step three: in order to reduce environmental impact and other noise when taking a picture, the image is subjected to gray scale conversion and median filtering. For the granularity detection of the pellet, a color image is not needed, only the gray information of the image is needed, and the color image is converted into a gray image, so that the storage space can be saved, and the operation speed can be improved. The basic principle of median filtering is to use the gray value of a pixel point in the image as the median volume of the gray values of each point adjacent to the point, and standard median filtering (i.e. 3 x 3 sliding window) is adopted in the invention to process the image
Step four: and (4) carrying out segmentation processing on the image by using a watershed algorithm to obtain an edge line image of the pellet particles. The watershed segmentation algorithm is a segmentation method of mathematical morphology based on a topological theory, the gray value of each pixel point in an image represents the altitude of the point, each local minimum value and the influence area of the local minimum value are called as a catchbasin, and the boundary of the catchbasin forms a watershed.
Step five: processing the edge line image to obtain the area S, the contour perimeter L and the radius R of the two-dimensional plane projection of each pellet particle, wherein the circularity rho is 4 pi S/L2Counting the distribution situation of the circularity rho and the radius R of all particles in a single picture, and storing the obtained distribution situation and the current operation parameters of the disc pelletizer 18 in the industrial control computer 2;
step six: and obtaining the current valve opening time, pelletizing disc inclination angle and disc rotating speed of the disc pelletizer 18, and judging the current improved control strategy in the software of the industrial control computer 2 by combining the distribution condition of pellet ore particle information in the picture. The specific control strategy may refer to a flow chart of the visual identification process of the picture 4.
Step seven: the corrected operation parameters are transmitted to the disc pelletizer 18 through a computer output signal control line;
step eight: and repeating the first step to the seventh step, and controlling the green ball quality within a target range until the operation is finished.
The equipment is used in actual production, the circularity and radius information of the pellet particles is objectively recorded and analyzed, the influence of subjective factors during manual operation is eliminated, and compared with manual judgment, the accuracy and response speed of data are obviously improved; compared with other preparation methods, two parameters of the disc inclination angle and the rotating speed of the disc pelletizer are introduced, so that the green ball quality can be more effectively stabilized within a target range, and the utilization rate of raw materials is improved.
The above-described specific implementation method is only a preferred embodiment of the present invention, and is not intended to limit any implementation form of the present invention. Those skilled in the art can make various changes and modifications to the disclosed embodiments without departing from the scope of the present invention, and all such changes and modifications as would be obvious to one skilled in the art are intended to be included within the scope of the present invention.
Claims (3)
1. A preparation device for improving the green ball quality of mineral powder pellets comprises: the device comprises an on-site electrical control box (1), an industrial control computer (2), an information input device (3), a display (4), a control signal transmission line (5), a water adding device valve (6) of a disc pelletizer, a disc inclination angle control (7) of the disc pelletizer, a rotating speed control (8) of the disc pelletizer, an industrial intelligent camera (13), a light source (14), a conveying belt (15) and the disc pelletizer (16);
the industrial control computer (2) is connected with the field electric control box (1) through a computer power line (17);
the information input device (3) comprises a keyboard and a mouse; the information input device (3) and the display (4) are connected with the industrial control computer (2) through data connecting lines;
the industrial control computer (2) is connected with a water adding device valve (6) of the disc pelletizer, a disc inclination angle control (7) and a disc pelletizer rotating speed control (8) through a control signal transmission line (5);
the light source (14) is arranged near the industrial intelligent camera (13), and the light source (14) is connected with the field electric control box (1) through light source power supply lines (9& 11);
the industrial intelligent camera (13) is connected with the field electric control box (1) through a camera power supply line (10); the industrial intelligent camera (13) is connected with the industrial control computer (2) through a camera data connecting line (12).
2. The pelletizing disc (16) according to claim 1, comprising in particular: the automatic pelletizer comprises a pelletizer disc (18), a triangular support frame (19), a disc scraper support (20), a rotary transmission shaft (21), a disc pelletizer base (22), a triangular support frame telescopic shaft (23), a telescopic shaft rotary fulcrum (24), a triangular support frame bottom rotary fulcrum (25), a No. 1 bottom scraper (26), a side scraper (27), a No. 2 bottom scraper (28), a water spraying device valve (29) and a water spraying device support (30);
the base (22) of the disc pelletizer is placed on a horizontal plane; the triangular support frame (19) is connected with a base (22) of the disc pelletizer through a bottom rotating fulcrum (25); the triangular support frame (19) is connected with a telescopic shaft (23) of the triangular support frame through a telescopic shaft rotating fulcrum (24); the bottom of a telescopic shaft (23) of the triangular support frame is obliquely fixed on a base (22) of the disc pelletizer;
the lower end of a rotary transmission shaft (21) is fixed on a triangular support frame, and a rotary component of the rotary transmission shaft is connected with a large tooth at the bottom of a disc (18) of a disc pelletizer through a gear;
a No. 1 bottom scraper (26), a side scraper (27) and a No. 2 bottom scraper (28) are all installed and fixed on a disc scraper support (20), a water spraying device valve (29) is fixed on a water spraying device support (30), and the water spraying device support (30) is fixed on the disc scraper support (20).
3. The use method of the preparation device for improving the green ball quality of the mineral powder pellet ore, which is used by the preparation device for improving the green ball quality of the mineral powder pellet ore in any claim 1 or 2, is characterized by comprising the following steps:
the method comprises the following steps: turning on a light source (14), and starting an industrial camera (13) to shoot to acquire image data;
step two: extracting ROI from the shot image;
step three: carrying out noise reduction processing on the image by using a standard median filtering method;
step four: segmenting the image by using a watershed algorithm to obtain an edge line image of the pellet;
step five: processing the edge line image to obtain the distribution condition of the circularity and the radius of the pellet particles, and storing the obtained distribution condition and the current operation parameters of the disc pelletizer (18) in an industrial control computer (2);
step six: the parameters of the disc pelletizer (18) are adjusted by combining the current pellet ore particle information distribution situation and the current operation parameters of the disc pelletizer (18), and the adjusted parameters comprise: the opening time of the water feeding valve, the inclination angle of the disc and the rotating speed of the disc;
step seven: the industrial control computer (2) sends the corrected operation parameters to the disc pelletizer (18) through an output signal control line, and the disc pelletizer (18) executes the corrected operation parameters;
step eight: and repeating the first step to the seventh step to control the green ball quality within a target range.
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| CN201911035829.4A CN111041194A (en) | 2019-10-29 | 2019-10-29 | Preparation device for improving green pellet quality of mineral powder pellets and application method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112143845A (en) * | 2020-08-21 | 2020-12-29 | 河钢股份有限公司承德分公司 | Iron-making blast furnace feeding granularity detection device and method |
| CN113296561A (en) * | 2020-08-20 | 2021-08-24 | 中冶长天国际工程有限责任公司 | Control system and control method for pelletizer |
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| CN113296561A (en) * | 2020-08-20 | 2021-08-24 | 中冶长天国际工程有限责任公司 | Control system and control method for pelletizer |
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| CN113296561B (en) * | 2020-08-20 | 2022-06-14 | 中冶长天国际工程有限责任公司 | Control system and control method for pelletizer |
| CN112143845A (en) * | 2020-08-21 | 2020-12-29 | 河钢股份有限公司承德分公司 | Iron-making blast furnace feeding granularity detection device and method |
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