CN117242194A - Method and apparatus for producing sintered ore - Google Patents
Method and apparatus for producing sintered ore Download PDFInfo
- Publication number
- CN117242194A CN117242194A CN202280029617.9A CN202280029617A CN117242194A CN 117242194 A CN117242194 A CN 117242194A CN 202280029617 A CN202280029617 A CN 202280029617A CN 117242194 A CN117242194 A CN 117242194A
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- Prior art keywords
- wind speed
- width direction
- sintered ore
- layer
- producing
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- 238000000034 method Methods 0.000 title abstract description 12
- 239000010410 layer Substances 0.000 claims abstract description 110
- 238000005245 sintering Methods 0.000 claims abstract description 67
- 238000004519 manufacturing process Methods 0.000 claims abstract description 41
- 239000000463 material Substances 0.000 claims abstract description 33
- 239000002344 surface layer Substances 0.000 claims abstract description 12
- 238000005259 measurement Methods 0.000 claims description 15
- 238000009826 distribution Methods 0.000 claims description 14
- 238000000917 particle-image velocimetry Methods 0.000 claims description 13
- 239000007789 gas Substances 0.000 description 18
- 238000009423 ventilation Methods 0.000 description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 239000003575 carbonaceous material Substances 0.000 description 8
- 239000002245 particle Substances 0.000 description 8
- 238000010304 firing Methods 0.000 description 7
- 238000007599 discharging Methods 0.000 description 6
- 238000003860 storage Methods 0.000 description 6
- 239000000446 fuel Substances 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000000571 coke Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005538 encapsulation Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- 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
- C22B1/16—Sintering; Agglomerating
- C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
- F27B21/02—Sintering grates or tables
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention provides a method for manufacturing sintered ore and a device for manufacturing sintered ore, which can reduce uneven sintering in the width direction of a trolley. A method for producing a sintered ore, which comprises forming a loading layer by loading a sintering material into a circulating carriage, igniting a surface layer of the loading layer by an ignition furnace, and sucking air downward and burning the sintering material, wherein a wind speed in a width direction of the carriage above the loading layer including a region within 800mm from a side wall of the carriage is measured, and an operation condition of the Deg/W type sintering machine is adjusted so that a wind speed deviation in the width direction is within a predetermined range.
Description
Technical Field
The present invention relates to a method and an apparatus for producing sintered ore as a raw material for a blast furnace.
Background
Sintered ores as raw materials for blast furnaces are usually produced by using, as sintering materials, powdery iron ores recovered in iron works, powdery iron-containing raw materials such as sieved ores as sintered ores, raw materials containing CaO such as limestone and dolomite, and powdery carbon materials (solid fuels) such as coke and anthracite, and using, as sintering materials, a debut-laud sintering machine (hereinafter, sometimes referred to as "sintering machine") as an endless mobile sintering machine. The sintering material is charged into an endless traveling carriage of a sintering machine to form a charged layer. The thickness (height) of the encased layer is about 400mm to about 800mm. Then, the carbon material on the surface layer of the charge layer is ignited by an ignition furnace provided above the charge layer. Air is sucked downward by a bellows provided below the carriage, whereby the carbon materials in the charged layer are burned in sequence. The combustion gradually advances toward the front in the moving direction and downward as the carriage moves. By using the combustion heat generated at this time, the sintering material is burned and melted to produce a sintered cake. Then, the obtained sintered cake is crushed in a ore discharging portion, cooled by a cooler, and granulated to obtain a finished sintered ore.
In the above-described sintering machine, from the viewpoint of improving the strength and yield of the sintered ore, it is preferable that: the carbon material is uniformly burned in the width direction of the carriage, and the burning of the carbon material is completed in the ore discharging portion of the crushed and sintered cake, thereby obtaining a uniformly burned cake. Studies have been conventionally conducted to uniformly bake in the width direction of the carriage. For example, patent document 1 discloses a method for producing a sintered ore, in which the opening degree of a dividing gate in the width direction of a carriage is controlled so as to adjust the layer thickness of a charged layer so that the difference between the upper surface height of a red hot portion in one region of a sintered cake divided in the width direction of the carriage of a ore discharging section and the average upper surface height of the whole red hot portion of the sintered cake is within a predetermined range. Patent document 2 discloses a technique for measuring a wind speed and improving a firing unevenness of a sintered ore by using a wind speed measuring device provided on a carriage.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 2017-57481
Patent document 2: japanese patent laid-open No. 61-250120
Disclosure of Invention
Problems to be solved by the invention
In patent document 1, the opening degree of the dividing gate in the width direction of the carriage is controlled based on the height of the red-hot portion observed on the fracture surface of the sintered cake of the ore discharging portion, so that the layer thickness of the charged layer is adjusted. It takes about 25 to 30 minutes from the loading of the sintering material into the pallet until the height of the red hot portion is observed at the fracture surface of the sintered cake. Therefore, there are the following problems: the thickness of the layer to be deposited for uniform firing in the width direction of the pallet cannot be quickly adjusted.
On the other hand, as disclosed in patent document 2, by using the wind speed measured by the wind speed measuring device provided on the carriage, the thickness of the layer to be built in can be quickly adjusted. However, in patent document 2, 3 wind speed measuring devices are provided on the carriage in the width direction of the carriage, and the wind speed measuring devices are moved together with the carriage to measure the wind speed. Therefore, due to the limitation in the size of the wind speed measuring device, it is difficult to measure the wind speed in the vicinity of the side wall of the trolley. Therefore, there are the following problems: since the layer thickness near the side wall of the pallet cannot be adjusted, uniform firing in the width direction of the pallet, that is, variation in the firing rate of the charged layer cannot be achieved.
Means for solving the problems
The method for solving the above-described problems is as follows.
[1] A method for producing a sintered ore, which comprises forming a loading layer by loading a sintering material into a circulating carriage, igniting a surface layer of the loading layer by an ignition furnace, and sintering the sintering material while sucking air downward, wherein a wind speed in a width direction of the carriage above the loading layer including a region within 800mm from a side wall of the carriage is measured, and an operation condition of the De-white sintering machine is adjusted so that a wind speed deviation in the width direction is within a predetermined range.
[2] The method for producing a sintered ore according to [1], wherein the wind speed is measured by particle image velocimetry.
[3] The method for producing a sintered ore according to [1] or [2], wherein the wind speed is measured at 2 or more different positions in the moving direction of the carriage.
[4] The method for producing a sintered ore according to item [1], wherein the operating condition is adjusted using an effective wind speed obtained by subtracting a wind speed reference value determined from a distance from a side wall of the carriage from the measured wind speed as the wind speed.
[5] The method for producing a sintered ore according to item [2], wherein the operating condition is adjusted using an effective wind speed obtained by subtracting a wind speed reference value determined from a distance from a side wall of the carriage from the measured wind speed as the wind speed.
[6] The method for producing a sintered ore according to item [3], wherein the operating condition is adjusted using an effective wind speed obtained by subtracting a wind speed reference value determined from a distance from a side wall of the carriage from the measured wind speed as the wind speed.
[7] The method for producing a sintered ore according to [1], wherein the operating condition is a layer thickness distribution in a width direction of the pallet of the charged layer.
[8] The method for producing a sintered ore according to [2], wherein the operating condition is a layer thickness distribution in a width direction of the pallet of the charged layer.
[9] The method for producing a sintered ore according to [3], wherein the operating condition is a layer thickness distribution in a width direction of the pallet of the charged layer.
[10] The method for producing a sintered ore according to [4], wherein the operating condition is a layer thickness distribution in a width direction of the pallet of the charged layer.
[11] The method for producing a sintered ore according to [5], wherein the operating condition is a layer thickness distribution in a width direction of the pallet of the charged layer.
[12] The method for producing a sintered ore according to [6], wherein the operating condition is a layer thickness distribution in a width direction of the pallet of the charged layer.
[13] A device for producing a sintered ore, which is provided with a De-Bunge-Egypt type sintering ore having a trolley which circulates and forms a loading layer of a sintering material, comprising:
a wind speed measurement unit that measures a wind speed in a width direction of the pallet above the loading layer including an area within 800mm from a side wall of the pallet; and
and a control unit that adjusts the operation conditions so that the wind speed variation in the width direction of the carriage falls within a preset range.
Effects of the invention
According to the method and apparatus for producing sintered ore of the present invention, the wind speed of the region in the width direction of the pallet including the vicinity of the side wall of the pallet where the wind speed is difficult to measure is measured, so that the variation in firing of the sintering material in the width direction of the pallet can be reduced. Thus, the sintering material can be fired in a state of less unevenness throughout the width direction of the pallet, and the yield of the sintered ore can be improved.
Drawings
Fig. 1 is a perspective view showing an example of the ore feeding portion side of the debut-laud type sintering machine used in the method for producing sintered ore according to the present embodiment.
Fig. 2 is a diagram showing a relationship between the position of the trolley in the width direction and the wind speed reference value.
Fig. 3 is a perspective view showing an example of a method for producing another sintered ore using a debut-lauead sintering machine.
Fig. 4 is a graph showing a relation between the air volume and the TI intensity of the sintered ore.
Fig. 5 is a diagram showing a relationship between a position in the width direction of the vehicle and a wind speed.
Detailed Description
The present invention will be described below with reference to embodiments thereof. Fig. 1 is a perspective view showing an example of the ore feeding portion side of a debut-laud type sintering machine (sintered ore manufacturing apparatus) 10 used in the sintered ore manufacturing method of the present embodiment. The sintering material is a granular material obtained by granulating a material containing iron ore and a carbon material into quasi-particles. The sintering material is cut out from a buffer hopper 12 of the Dewhite-Laue-Ehde sintering machine 10 by a roll feeder 14, and is loaded into a endless traveling carriage 15 that is circulated. The loading layer of the sintering material is formed by loading the sintering material into the carriage 15. The thickness of the layer to be built in can be adjusted by opening of two or more dividing gates 16 provided in the width direction of the carriage 15. In the present embodiment, for example, as shown in fig. 1, 8 split gates 16 are arranged in a row in the width direction of the carriage 15. For each of the divided gates 16, gate numbers (1 to 8) are assigned in correspondence with the order of the positions of the carriage 15 in the width direction.
The loading layer moves downstream (arrow direction in fig. 1) of the dewhite-laud sintering machine 10 together with the carriage 15. The fill level meter 18 measures the layer thickness of the insert layer and outputs the measured data to the control device 30. The level gauge 18 is provided with 8 pieces of the same dividing number as the dividing gate 16. Each of the level gauges 18 is provided 1 on the downstream side of each of the split gates 16. The respective level gauges 18 are assigned the same numbers as the gate numbers of the split gates provided on the upstream side. Therefore, the level gauge 18 measures the layer thicknesses of the insert layers adjusted by the split gates 16 assigned the same number. As the level gauge 18, for example, an ultrasonic level gauge may be used.
The surface layer of the charge layer is ignited by an ignition furnace 20. Further, air is sucked by a blower (not shown). That is, the air in the packed layer is sucked downward by two or more bellows 22 provided in the machine length direction below the carriage 15. Thus, air is introduced into the charged layer from above, and the carbon material contained in the sintering material burns.
The sintering material is burned and fixed by combustion heat generated by combustion of the carbon material, and thereby becomes a sintered cake which is a lump of the sintered ore. The sintered cake is discharged from the ore discharging section. The sintered cake discharged from the ore discharging section is cracked and broken in the width direction of the carriage 15 immediately before falling from the carriage 15. Then, the sintered cake was crushed, cooled by a cooler, and granulated. Thus, the sintered cake is, for example, a finished sintered ore composed of a lump having a particle size of more than 5.0 mm. In the example shown in fig. 1, the gas fuel and the oxygen-enriched air are not supplied from above the loading layer, but the present invention is not limited to this. The gaseous fuel and the oxygen-enriched air may be supplied from above the packed bed and introduced into the packed bed. As the gas fuel, a combustible gas selected from blast furnace gas, coke oven gas, a mixed gas of blast furnace gas and coke oven gas, converter gas, city gas, natural gas, methane gas, ethane gas, propane gas, shale gas, and a mixed gas obtained by mixing 2 or more of these gases can be used.
The wind speed above the loading level averages about 0.5m/s and the maximum wind speed is about 2.0m/s. Therefore, the anemometer (wind speed measuring means) for measuring the wind speed above the loading layer preferably has a measurement accuracy of 0.1m/s or less. In the method for producing a sintered ore according to the present embodiment, a particle image velocimetry (PIV method: particle Image Velocimetry) is used as a wind speed measuring means to measure a wind speed above a packed bed. For example, the particle image velocimetry may be a method described in "PIV foundation and application-particle image velocimetry-" (M.Raffel and 2 others, kagaku Xiao and 2 others, first edition, springer Verlag Tokyo Co., ltd., 6/20/2000). The particle image velocimetry is the following method: the laser light source 24 irradiates laser light on particles such as dust following the flow of the gas in a planar manner, and the digital camera 26 photographs the particles at predetermined intervals at least 2 times, whereby the wind speed is obtained from the change in the positions of the particles in the obtained 2 or more images. Regarding the shooting interval of the digital camera 26, in the case where the laser light source 24 irradiates the laser light in the form of a pulse laser light, it can be determined according to the pulse period thereof. In addition, in the case where the laser light source 24 continuously irradiates the laser light, the imaging interval can be determined by a preset imaging period of the digital camera 26. In the present embodiment, an example will be described in which the laser light source 24 irradiates laser light in the form of pulse laser light. Specifically, the laser light source 24 irradiates laser light in a planar manner in the width direction of the carriage 15 at a prescribed pulse period, and synchronizes the photographing period of the digital camera 26 with the pulse period. The wind speed in the vicinity of the side wall of the carriage 15 (within 800mm from the side wall) may be measured by using a small wind speed measuring device having a width dimension of 800mm or less of the carriage 15 within 800mm from the side wall as the wind speed measuring means.
Since the thickness of the build-up layer is adjusted by the dividing gates 16, if the opening between adjacent dividing gates 16 is different, a level difference occurs in the surface layer of the build-up layer. In order to prevent interference between the divided gate 16 provided at the end portion in the width direction of the carriage 15 and the side wall, and to prevent the sintering material from being sandwiched between the side wall and the divided gate 16, a gap is provided between the divided gate 16 and the side wall. Therefore, the thickness of the layer of the encapsulation layer from the sidewall to the gap increases, and thus a difference in level occurs between the surface layer of the encapsulation layer passing through the gap and the surface layer of the encapsulation layer adjusted by the split gate 16. When the wind speed measuring device is provided to measure the wind speed above the loading layer in such a manner that a height difference occurs in the surface layer of the loading layer, a gap is generated between the surface layer of the loading layer and the wind speed measuring device due to the height difference, and the wind speed measurement accuracy may be lowered.
Particle image velocimetry can remotely measure a wide range of wind speeds in a non-contact manner at high speed. Further, since the measurement position can be arbitrarily set within the range of the resolution of the digital camera 26, the wind speed at each position in the width direction of the carriage 15 can be measured at a narrow interval. Therefore, the following effects 1 to 4 can be obtained by using the particle image velocimetry for measuring the wind speed above the packed bed.
1. The wind speed in the vicinity of the side wall (within 800mm from the side wall) of the carriage 15 can be measured.
2. By using the laser light source 24 and the digital camera 26 as a single set and using them as wind speed measuring means, a wide range of wind speeds can be measured in the width direction of the carriage 15.
3. The wind speed can be measured continuously at narrow intervals in the width direction of the carriage 15.
4. The wind speed in the width direction of the carriage 15 can be measured at any time.
The control device 30 includes a control unit 32 and a storage unit 34. The control device 30 is a general-purpose computer including a CPU and the like, such as a workstation and a personal computer. The control unit 32 controls the operations of the debut-laud sintering machine 10, the laser light source 24, and the digital camera 26 by using, for example, programs and data stored in the storage unit 34. The storage unit 34 may use a nonvolatile memory, and may use an information storage medium such as a flash memory, a built-in hard disk, a hard disk connected via a data communication terminal, or a memory card. The storage unit 34 stores a program required for the implementation of the method for producing sintered ore of the present embodiment, data used for the execution of the program, and the like.
The laser light source 24 irradiates the width direction of the carriage 15 with laser light 2 times in a planar manner at a predetermined pulse period. The digital camera 26 photographs a plane including a position irradiated with laser light, that is, an irradiation position, at a photographing interval (before and after the pulse period) synchronized with the pulse period, thereby generating 2 pieces of image data. The digital camera 26 outputs 2 pieces of image data to the control section 32. The control unit 32 calculates the wind speed above the loading layer including a range within 800mm from the side wall of the carriage 15 from the movement amount (calculated by image processing) of the microparticles obtained from the 2 pieces of image data acquired from the digital camera 26 and the imaging interval of the digital camera 26 (acquisition pulse period or acquisition imaging interval information transmitted from the digital camera 26). The control unit 32 calculates wind speeds above the 8-region loading layer of the split brake 16 corresponding to the position of the carriage 15 in the width direction. The 8 regions (regions 1 and 8) which are both ends of the carriage 15 in the width direction include a range of 800mm or less from the side wall of the carriage 15. In the particle image velocimetry, since the wind speed measuring device in contact with the surface layer of the loading layer is not used, the wind speed within a range of 800mm from the side wall of the carriage 15 can be easily measured. In addition, even when a difference in height occurs in the surface layer of the loading layer, the wind speed measurement accuracy does not decrease, and therefore, it is preferable to use a particle image velocimetry for wind speed measurement above the loading layer.
After calculating the wind speeds in the 8 regions, the control unit 32 adjusts the opening degrees of the dividing gates 16 and adjusts the layer thickness distribution of the built-in layers so that the wind speed variation in the 8 regions falls within a predetermined range. The control unit 32 first calculates the average wind speed in 8 areas corresponding to the positions of the respective divided gates 16. Next, the control unit 32 calculates the average wind speed of the entire width direction of the carriage 15 using the average wind speeds of the 8 regions. The control unit 32 determines a region in which the average wind speed of each region is 110% or more of the average wind speed of the whole and a region in which the average wind speed of each region is 90% or less of the average wind speed of the whole. If the ventilation of the loading layer is high, the wind speed above the loading layer becomes high, and if the ventilation of the loading layer is low, the wind speed above the loading layer becomes low. Therefore, the control unit 32 enlarges the opening of the dividing gate 16 (the dividing gate 16 upstream of the region in the moving direction of the loading layer) provided at the same position as the region in the width direction in a region where the average wind speed above the loading layer reaches 110% or more of the average wind speed of the whole, thereby increasing the layer thickness of the loading layer. This reduces the ventilation of the loading layer in the region, and slows down the wind speed in the region. As a result, the wind speed variation in the width direction of the carriage 15 can be reduced. For example, the control unit 32 enlarges the opening of the dividing gate 16 so that the thickness of the layer to be deposited increases by 3mm for a region where the wind speed reaches 110% of the average value.
On the other hand, the control unit 32 reduces the opening of the dividing gate 16 (dividing gate 16 upstream of the region in the moving direction of the loading layer) provided at the same position as the region in the width direction in a region where the average wind speed above the loading layer is 90% or less of the average wind speed of the whole, and thereby reduces the layer thickness of the loading layer. This improves the ventilation of the loading layer in the region, and increases the wind speed in the region. As a result, the wind speed variation in the width direction of the carriage 15 becomes small. The control unit 32 reduces the opening of the dividing gate 16 so that the thickness of the packed layer is reduced by 3mm for a region where the wind speed reaches 90% of the average value, for example. The control unit 32 adjusts the layer thickness distribution of the build-up layer in such a manner that the wind speed variation in 8 regions is within ±10% of the average wind speed of the whole. The average wind speed of ±10% of the entire range is an example of a preset range.
The control unit 32 acquires data indicating the layer thickness of the insert layer from the level gauge 18 and the gate number assigned to the level gauge 18. The control unit 32 compares the data showing the layer thickness with the set value of the layer thickness, and feedback-controls the opening degree of the dividing gate 16.
In this way, when the opening degree of each split gate 16 is adjusted to reduce the variation in wind speed in the width direction of the carriage 15, the variation in the ventilation of the loading layer becomes small, and the variation in the firing rate in the width direction of the carriage 15 can be reduced. As a result, the sintering material can be fired uniformly in the width direction of the pallet 15 (the variation in firing can be reduced) including the vicinity of the side wall of the pallet 15, and the strength and yield of the produced sintered ore can be improved. The adjustment of the opening degree of the dividing gate 16 is an example of the adjustment of the operation condition of the de white-laoded sintering machine 10. The adjustment of the operation condition may be a matter related to the adjustment of the wind speed, a matter that affects the strength and yield that change due to the ventilation, or the like. For example, the ventilation rod may be inserted instead of adjusting the opening degree of the split brake 16. The ventilation rod is a rod inserted into the insertion layer from above, and by inserting the ventilation rod into the insertion layer, the ventilation around the ventilation rod is improved, and therefore, the wind speed above the ventilation rod is also improved. Furthermore, the supply positions of the gas fuel and the oxygen-enriched air may be adjusted to increase the strength of the sintered ore in the region where the wind speed is high. By supplying the gas fuel and the oxygen-enriched air to the region having a high wind speed from above, the sintering material in the region can be kept at an appropriate sintering temperature for a longer period of time, and therefore, the strength of the sintered ore can be improved.
A gap was provided between the sintering material and the side wall of the pallet 15 in a region within 800mm from the side wall of the pallet 15, which is the both ends in the width direction of the pallet 15. The gap between the side wall and the side wall is larger than the gap between the sintering materials. Therefore, in this region, the wind speed above the loading layer may be increased due to the influence of the outside air passing through the gap with the side wall. It is therefore preferred that: the control unit 32 previously recognizes the influence of the outside air passing through the gap between the side wall and the wind speed reference value, and adjusts the operation condition by using the effective wind speed obtained by subtracting the wind speed reference value from the measured wind speed as the wind speed.
Fig. 2 is a diagram showing a relationship between the position of the carriage 15 in the width direction and the wind speed reference value. In fig. 2, the horizontal axis represents the position (m) of the carriage 15 in the width direction, and the vertical axis represents the wind speed reference value (m/s). The wind speed reference value can be obtained by test measurement in a cold environment. Further, as the wind speed reference value, a measurement result of a portion that is confirmed to be good in progress of sintering by observing the sintering section at the ore discharge portion may be used. As shown in fig. 2, the wind speed reference value is determined according to the distance from the side wall of the dolly 15. Therefore, by adjusting the operation conditions using the effective wind speed obtained by subtracting the wind speed reference value of the corresponding position in the width direction from each wind speed measured in the width direction of the pallet 15 as the wind speed, the sintering material can be further uniformly fired in the width direction of the pallet including the region within 800mm from the side wall of the pallet 15.
The interval between the wind speed measurement positions may be one-half or less of the width of the carriage 15, and in consideration of the influence of the side walls, it is preferably one-fourth or less, more preferably one-tenth or less of the width of the carriage 15. The narrower the interval between the wind speed measurement positions, the more preferable the interval between the wind speed measurement positions is, but even if the interval between the wind speed measurement positions is set to be narrower than the quasi-particle diameter of the sintering material, that is, 5mm, the information obtained is not increased. Therefore, the interval between the measurement positions of the wind speed may be 5mm or more and one-half or less of the width dimension of the carriage.
Fig. 3 is a perspective view showing an example of a method for producing another sintered ore using the debut-lauead sintering machine 10. As shown in fig. 3, the wind speed is preferably measured at 4 different positions in the moving direction of the carriage 15. By using the average value of the wind speeds in the width direction of the carriage 15 measured at the different 4 positions in the moving direction of the carriage 15 in this way, even if the wind speed above the loading layer of the portion locally changes due to the occurrence of the blockage of 1 bellows 22, the influence thereof can be reduced, and appropriate adjustment more suitable for the actual situation can be performed. In the example shown in fig. 3, an example in which wind speeds are measured at 4 different positions in the moving direction of the carriage 15 is shown, but the present invention is not limited thereto. The wind speed measurement may be performed at 2 or more different positions in the moving direction of the carriage 15, and thus, an effect of suppressing erroneous adjustment can be obtained.
Fig. 4 is a graph showing a relation between the air volume and the TI intensity of the sintered ore. In fig. 4, the horizontal axis represents the air volume (m 3 Per minute), the vertical axis is the TI strength (%) of the sintered ore. TI strength is the rotational strength index of the sintered ore measured in accordance with JIS M8712. The amount of suction air was changed using a test sintering apparatus to manufacture sintered ore. The air volume on the machine of the test sintering apparatus was measured by the particle image velocimetry. As a result, as shown in fig. 4, the strength of the sintered ore decreases as the air volume increases (as the air speed increases).
From the results, it is found that the air volume (the air velocity is reduced) is required to increase the strength of the sintered ore. This is because if the air volume is small (the air speed is slow), the progress of sintering proceeds at a low speed, and the sintering material can be kept at the sintering temperature (1200 ℃ or higher) for a longer period of time. On the other hand, if the air volume is reduced and the sintering speed is reduced, the productivity of the sintered ore is lowered. Therefore, it is sufficient to determine an appropriate air volume as a target by examining the following conditions: the necessary strength of the sintered ore determined according to the conveyor to the blast furnace and the loading conditions, the necessary production amount determined according to the market situation and the like, the rated production capacity determined according to the size and function of the sintering machine, and the like.
In the De-white sintering machine shown in FIG. 1, the wind speed above the loading layer was measured at intervals of 10mm from a certain point to 1000mm in the front-rear direction of the width direction of the carriage 15 with the reference point as a reference, and the effective wind speed was obtained. Fig. 5 is a diagram showing a relationship between the position of the carriage 15 in the width direction and the effective wind speed. In FIG. 5, the horizontal axis represents the position (mm) of the carriage 15 in the width direction, and the vertical axis represents the effective wind speed (m/s).
As shown in fig. 5, the effective wind speed above the loading layer varies at short intervals in the width direction of the carriage 15. Therefore, if the opening degree of the dividing gate 16 is adjusted so as to increase the thickness of the layer to be deposited by 3mm in a region where the effective wind speed is 10% higher than the average value (broken line in fig. 5) and is continued by 50mm or more, the return loss rate (return fine consumption rate) is reduced by 10 mass%. The return ore consumption rate is: in the sieving step after sintering, crushing and cooling, for example, the objects passing through a sieve having a mesh size of 5mm are set as return ores unsuitable for charging into a blast furnace, and the mass of the return ores is divided by the mass of the finished sintered ores on the sieve. If the sintering of the sintering material becomes uneven, the return ore consumption rate increases, and the more even the sintering material is (the less the non-uniformity of the sintering is), the lower the return ore consumption rate is. In addition, the reduction in the return ore consumption rate means that a large amount of finished sintered ore having a large particle size can be produced after the finishing. Therefore, according to the method for producing a sintered ore of the present invention, the yield of the sintered ore can be improved, and the strength of the sintered ore can be improved.
In the method disclosed in patent document 2, a wind speed is measured using a wind speed measuring device. Therefore, due to the limitation in size, the wind speed in the vicinity of the side wall of the trolley cannot be measured. Therefore, it is not possible to grasp the fluctuation of the wind speed at both ends (particularly, in the range of 450 to 500 mm) in the width direction of the carriage. Therefore, the method disclosed in patent document 2 cannot perform the above-described layer thickness adjustment as in the method for producing sintered ore of the present invention, and thus it is difficult to reduce the return ore consumption rate. In contrast, in the method for producing sintered ore according to the present embodiment, the wind speed of the region in the width direction of the carriage 15 including the vicinity of the side wall of the carriage 15 is measured, and the thickness of the layer to be packed is adjusted so that the wind speed variation in the width direction falls within a predetermined range. This allows the sintering material to be uniformly fired in the width direction of the pallet 15 so as to include the vicinity of the side wall of the pallet 15. As a result, the yield of the sintered ore and the strength of the sintered ore can be improved.
Symbol description
10 Dewhite-Laue Ehde sintering machine
12. Buffer hopper
14. Roller feeder
15. Trolley
16. Dividing gate
18. Level meter
20. Ignition furnace
22. Bellows
24 laser light source (wind speed measuring unit)
26 digital cameras (anemometer unit)
30. Control device
32. Control unit
34. Storage part
Claims (13)
1. A method for producing a sintered ore by using a Dewye-Laided sintering machine in which a sintering material is charged into a circulating carriage to form a charged layer, the surface layer of the charged layer is ignited by an ignition furnace, and the sintering material is sintered while air is sucked downward,
measuring a wind speed in a width direction of the pallet above the loading layer including a region within 800mm from a side wall of the pallet, and adjusting an operation condition of the de-white-de sintering machine so that a wind speed deviation in the width direction is within a predetermined range.
2. The method for producing a sintered ore according to claim 1, wherein the wind speed is measured by particle image velocimetry.
3. The method for producing a sintered ore according to claim 1 or 2, wherein the wind speed is measured at 2 or more positions different in the moving direction of the carriage.
4. The method for producing a sintered ore according to claim 1, wherein the operating condition is adjusted using an effective wind speed obtained by subtracting a wind speed reference value determined from a distance from a side wall of the carriage from the measured wind speed as the wind speed.
5. The method for producing a sintered ore according to claim 2, wherein the operating condition is adjusted using an effective wind speed obtained by subtracting a wind speed reference value determined from a distance from a side wall of the carriage from the measured wind speed as the wind speed.
6. The method for producing a sintered ore according to claim 3, wherein the operating condition is adjusted using an effective wind speed obtained by subtracting a wind speed reference value determined from a distance from a side wall of the carriage from the measured wind speed as the wind speed.
7. The method for producing a sintered ore according to claim 1, wherein the operating condition is a layer thickness distribution in a width direction of the pallet of the charged layer.
8. The method for producing a sintered ore according to claim 2, wherein the operating condition is a layer thickness distribution in a width direction of the pallet of the charged layer.
9. The method for producing a sintered ore according to claim 3, wherein the operating condition is a layer thickness distribution in a width direction of the pallet of the charged layer.
10. The method for producing a sintered ore according to claim 4, wherein the operating condition is a layer thickness distribution in a width direction of the pallet of the charged layer.
11. The method for producing a sintered ore according to claim 5, wherein the operating condition is a layer thickness distribution in a width direction of the pallet of the charged layer.
12. The method for producing a sintered ore according to claim 6, wherein the operating condition is a layer thickness distribution in a width direction of the pallet of the charged layer.
13. A device for producing a sintered ore, which is provided with a De-Bunge-Egypt type sintering ore having a trolley which circulates and forms a loading layer of a sintering material, comprising:
a wind speed measurement unit that measures a wind speed in a width direction of the pallet above the loading layer including an area within 800mm from a side wall of the pallet; and
and a control unit that adjusts the operation conditions so that the wind speed variation in the width direction of the carriage falls within a preset range.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021075678A JP7342911B2 (en) | 2021-04-28 | 2021-04-28 | Method for manufacturing sintered ore |
| JP2021-075678 | 2021-04-28 | ||
| PCT/JP2022/018840 WO2022230858A1 (en) | 2021-04-28 | 2022-04-26 | Method for manufacturing sintered ore and device for manufacturing sintered ore |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117242194A true CN117242194A (en) | 2023-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202280029617.9A Pending CN117242194A (en) | 2021-04-28 | 2022-04-26 | Method and apparatus for producing sintered ore |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP7342911B2 (en) |
| KR (1) | KR20230157466A (en) |
| CN (1) | CN117242194A (en) |
| WO (1) | WO2022230858A1 (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58213836A (en) * | 1982-06-08 | 1983-12-12 | Kawasaki Steel Corp | Method for determining optimum extent of operation under operational condition during operation of sintering apparatus |
| JPS61250120A (en) | 1985-04-26 | 1986-11-07 | Sumitomo Metal Ind Ltd | Operating method for sintering machine |
| JPH09125165A (en) * | 1995-08-25 | 1997-05-13 | Nippon Steel Corp | Operation of sintering and sintering pallet |
| CN104508157B (en) | 2012-07-18 | 2016-08-24 | 杰富意钢铁株式会社 | The manufacture method of sintering deposit |
| JP6515626B2 (en) | 2015-03-26 | 2019-05-22 | 富士ゼロックス株式会社 | Developing device and image forming apparatus |
| JP6384438B2 (en) | 2015-09-18 | 2018-09-05 | Ｊｆｅスチール株式会社 | Method for producing sintered ore |
| JP6547142B2 (en) | 2016-02-17 | 2019-07-24 | Ｊｆｅスチール株式会社 | Method of estimating combustion position of particulate reductant at blast tuyere of blast furnace and blower tuyere used for the method |
-
2021
- 2021-04-28 JP JP2021075678A patent/JP7342911B2/en active Active
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2022
- 2022-04-26 CN CN202280029617.9A patent/CN117242194A/en active Pending
- 2022-04-26 KR KR1020237035353A patent/KR20230157466A/en unknown
- 2022-04-26 WO PCT/JP2022/018840 patent/WO2022230858A1/en active Application Filing
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| Publication number | Publication date |
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| KR20230157466A (en) | 2023-11-16 |
| WO2022230858A1 (en) | 2022-11-03 |
| JP2022169935A (en) | 2022-11-10 |
| JP7342911B2 (en) | 2023-09-12 |
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