JP2011075212A - Sintering machine and method of operating the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sintering machine easing a harmful effect on a yield rate, sintering time, and production rate by accurately measuring layer thickness throughout the entire in the width direction of a sintering material charging layer on a sintering machine pallet, and thus, accurately acquiring the ventilation state of the entire of the sintering material charging layer and uniformizing the ventilation state. <P>SOLUTION: The Dwight-Lloyd type sintering machine 3 manufacturing sintered ore by sintering a sintering material charged on the sintering machine pallet 8 includes a material charging part 30 charging the sintering material on the sintering machine pallet 8, a layer thickness detecting part 40 continuously detecting the layer thickness in the width direction orthogonal to the conveyance direction of the sintering machine pallet of the surface of the material charging layer charged in the upper part of the sintering machine pallet by the material charging part 30, and a ventilation control part extracting ventilation increase required areas Ao11, Ao12 consolidated in flattening based on the layer thickness in the width direction of the charging layer detected by the layer thickness detecting part 40, and inserting ventilation rods 33a-33f in the extracted ventilation increase required areas. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a sintering machine for producing a high-strength, high-quality sintered ore using a downward suction type Dwytroid (DL) sintering machine and a method for operating the sintering machine.

  Sinter ore, which is the main raw material of the blast furnace ironmaking method, is generally manufactured through a process as shown in FIG. The raw materials are iron ore powder, iron mill recovered powder, sintered ore sieve powder (returning), CaO-containing auxiliary raw materials such as limestone and dolomite, granulation aids such as quick lime, coke powder and anthracite. These raw materials are cut out from each of the hoppers 101 on a conveyor at a predetermined ratio. The cut out raw material is added with an appropriate amount of water using a drum mixer 102 and the like, mixed and granulated to obtain a sintered raw material which is a pseudo particle having an average diameter of 3.0 to 6.0 mm. On the other hand, the finely sized sintered ore is cut out from the floor hopper 104 and a floor layer is formed on the great of the sintering machine pallet 108.

  The sintering raw material is charged on the floor layer on the endless moving type sintering machine pallet 108 through the drum feeder 106 and the cutting chute 107 from the surge hopper 105 arranged on the sintering machine, and sintered. A charging layer 109 of a sintering raw material, which is also called a binding bed, is formed. The thickness (height) of the charging layer is usually around 400 to 800 mm. Next, the raw material surface is flattened by the cut-off gate 110. Thereafter, an ignition furnace 111 installed above the charging layer 109 ignites the carbonaceous material in the surface layer of the charging layer 9 and air through a wind box 112 disposed under the pallet 108. Is sucked downward to sequentially burn the carbonaceous material in the charging layer, and a part of the sintering raw material is melted by the combustion heat generated at this time to obtain a sintered cake. The sintered cake thus obtained is then crushed and sized, and recovered as a product sintered ore comprising agglomerates of 5.0 mm or more.

  Here, the layer thickness of the raw material charging layer is greatly related to the air permeability of the raw material charging layer (sintered bed) during firing, and the portion with a large layer thickness is flattened by a cut-off gate compared to the small portion. After that, the airflow resistance is large because there is little decrease in the gap due to the consolidation of the raw material layer. For this reason, the sucked gas (atmosphere) is less likely to flow than the others in the portion where the layer thickness is large, and the gas flow rate becomes slow. As a result, in the portion where the gas flow rate is slow, the supply of oxygen for powder coke combustion is small, and the combustion zone slows down, that is, the combustion speed decreases, and the firing proceeds slowly.

When the gas flow rate is slow, a high temperature state by coke combustion can be maintained, but there is an unsolved problem that the progress of the combustion zone becomes slow and the influence on the sintering time and the production rate becomes large.
For this reason, in order to reduce the influence on the sintering time and the production rate, it is desirable to keep the layer thickness distribution of the raw material charging layer constant to suppress the fluctuation of the gas flow rate distribution and to make the firing rate uniform in the width direction. For this purpose, it is necessary to accurately grasp the layer thickness distribution in the width direction of the sintered raw material charged on the sintering machine pallet and adjust the layer thickness distribution.

  As a technique to measure the layer thickness of the raw material charge layer on the sintering machine pallet, a level meter placed in the width direction on the raw material supply side and the discharge side, and the feed portion layer thickness and discharge at each position in the width direction. Measure the thickness of the ore layer, calculate the shrinkage rate of the sintered ore from the difference, and adjust the raw material charge density at the rear end so that the deviation in the width direction of the cold strength and porosity of the ore is minimized. A technique is known that adjusts the divided gate opening so as to obtain the raw material charging density (see, for example, Patent Document 1).

  In addition, in order to prevent uneven burning of the sintered ore, the width of the first ventilation rod that is vertically arranged to provide a groove from above the sintered raw material layer on the pallet between the raw material supply unit and the ignition furnace. The second ventilation rod is arranged in parallel with the pallet traveling direction that penetrates from the lateral direction to the sintering raw material layer at the raw material dropping position from the raw material supply device onto the pallet. A plurality of tubes are arranged in the above, and the depth of the first ventilation rod with respect to the sintering raw material layer, the arrangement level of the second ventilation rod, and the charging length are adjusted according to the sintering state of the raw material. A method for preventing uneven burning of ore is known (for example, see Patent Document 2).

JP-A-5-5589 JP-A-4-198428

  However, in the technique described in Patent Document 1, as shown in FIG. 18, a certain number (for example, six) of thickness gauges 120a to 120f are provided in the width direction, and a constant portion immediately below each thickness gauge 120a to 120f is provided. Only the average layer thickness of the raw material charging device 121 in the region is measured. At present, it is impossible to grasp the state of the portion outside the measurement area. In actual charging, the raw material charging device 121 is attached to each part and worn, and the amount of the raw material charged into the sintering machine pallet 108 in the width direction varies at each position. The layer thickness of the charging layer 109 changes. For this reason, the case where the position which becomes the maximum or minimum layer thickness of the raw material charging thickness is not measured often occurs.

  Depending on the method of the raw material charging apparatus 121, the raw material charging layer 109 may be charged while forming a narrow groove at a certain position on the surface layer. However, if the average layer thickness directly under the layer thickness meters 120a to 120f is measured, such a layer thickness change portion is not included in the measurement area of the distance meter, and the change in the layer thickness is overlooked. . Even if it is in the measurement area, since it is regarded as an average layer thickness in a wide area, a fine and deep groove is recognized only as a small change.

  In the current measurement, the state of the entire charged layer of the raw material charged layer 109 cannot be grasped, and when the consolidated region is formed by the cut-off gate, this consolidated region cannot be accurately detected. Actually, the insertion position and the insertion depth in the width direction of the ventilation rod described in Patent Document 2 cannot be adjusted accurately. If the consolidation region due to the change in the thickness of the raw material charging layer 109 cannot be detected properly, a difference in the firing rate will occur in the charging layer 109, causing uneven burning and unburned, reducing the yield of sintered ore. The production rate will be suppressed to a low level.

  Therefore, the present invention has been made paying attention to the unsolved problems of the conventional example described in Patent Document 1 described above, and extends over the entire width direction of the sintering material charging layer on the sintering machine pallet. The layer thickness can be accurately measured, and the air flow state of the entire sintered raw material charging layer can be accurately grasped, and the air flow state can be made uniform to mitigate adverse effects on the sintering time and production rate. It is an object of the present invention to provide a sintering machine capable of performing the above and a method for operating the sintering machine.

  In order to achieve the above object, a sintering machine according to claim 1 of the present invention is a droidoid type sintering machine for producing sintered ore by sintering a sintering raw material charged on a sintering machine pallet. A raw material charging portion for charging a sintering raw material onto the sintering machine pallet, and a surface of the raw material charging layer charged at the upper portion of the sintering machine pallet at the raw material charging portion. At the time of flattening based on the layer thickness detection unit that continuously detects the layer thickness in the width direction orthogonal to the conveying direction of the sintering machine pallet, and the layer thickness in the width direction of the charging layer detected by the layer thickness detection unit It is characterized by comprising a ventilation control section for extracting a ventilation required increased area to be consolidated and inserting a ventilation rod into the extracted increased ventilation required area.

  The sintering machine according to a second aspect is the invention according to the first aspect, wherein the layer thickness detection unit includes a rotating mechanism disposed at a predetermined height position above the sintering machine pallet, A laser distance meter supported rotatably by a rotation mechanism, and scanning the surface of the raw material charging layer by rotating the laser distance meter with the rotation mechanism. The layer thickness of the layer is continuously measured in the width direction of the sintering machine pallet.

  According to a third aspect of the present invention, in the invention according to the first aspect, the layer thickness detector moves in the width direction of the sintering machine pallet to a predetermined height position above the sintering machine pallet. And moving the laser distance meter with the moving mechanism to scan the surface of the raw material charging layer, thereby moving the raw material charging layer. Is measured continuously in the width direction of the sintering machine pallet.

The sintering machine according to claim 4 is the invention according to claim 2 or 3, wherein the laser distance meter is composed of a plurality of laser distance meters arranged at predetermined intervals in the width direction of the sintering machine pallet. It is characterized by being.
The sintering machine according to a fifth aspect of the present invention is the invention according to any one of the first to fourth aspects, wherein the ventilation control unit is a plurality of ventilation rods that are vertically movable in the width direction of the raw material charging layer. And a ventilation rod facing the ventilation required area is inserted.

  Further, the operation method of the sintering machine according to claim 6 is an operation method of the Dwroid type sintering machine that sinters the sintering raw material charged on the sintering machine pallet to produce the sintered ore. A step of charging a sintering raw material into the upper part of the sintering machine pallet at a raw material charging part, and a width direction perpendicular to the conveying direction of the sintering machine pallet on the surface of the charging layer on the sintering machine pallet The step of detecting the layer thickness by the layer thickness detection unit, and the ventilation control unit extracts a region requiring increased ventilation to be consolidated at the time of flattening based on the detected layer thickness in the width direction, and the extracted increase in ventilation required And a step of inserting a ventilation rod into the region.

  According to the present invention, the layer thickness detector continuously detects the layer thickness in the width direction of the charging layer surface of the sintering machine pallet, and flattens the air flow control unit based on the detected layer thickness in the width direction. By extracting the area of increased ventilation required that is sometimes consolidated and inserting a ventilation rod into the extracted area of increased ventilation required, the air permeability in the consolidated portion is ensured, and the yield and the application rate at the time of sintering are improved. Can be made.

It is a figure which shows the supply part of a sintering machine, Comprising: (a) is a perspective view of a supply part, (b) is sectional drawing which shows layer thickness distribution, (c) is sectional drawing of a ventilation rod position. It is a side view which shows the specific structure of a sintering raw material charging device. It is a schematic diagram which shows the principle in which the consolidation area | region of a sintering raw material is formed. It is explanatory drawing which shows the relationship between the width direction layer thickness profile, a compaction state, and a light charging state. It is a figure which shows the test result which shows the state of the combustion zone by the fluctuation | variation of a charging state. It is explanatory drawing explaining the test conditions of FIG. It is a schematic block diagram which shows a ventilation control part. It is explanatory drawing which shows the time fluctuation | variation of the width direction layer thickness profile. It is explanatory drawing which shows the measurement principle of a laser distance meter. It is a schematic block diagram which shows the specific structure of a laser distance meter. It is explanatory drawing which shows a layer thickness detection principle. It is a flowchart which shows an example of the ventilation rod raising / lowering control processing procedure performed with an raising / lowering control apparatus. It is explanatory drawing which shows the relationship between the presence or absence of the insertion of a ventilation rod to a consolidation position, and sintered ore tumbler strength. It is a figure which shows the feed section of the sintering machine of the 2nd Embodiment of this invention, Comprising: (a) is a perspective view of a feed section, (b) is sectional drawing which shows layer thickness distribution, (c) is It is sectional drawing of a ventilation stick position. It is a schematic block diagram which shows the specific structure of the ventilation | gas_flowing control part in 2nd Embodiment. It is a flowchart which shows an example of the ventilation rod raising / lowering control processing procedure performed with the raising / lowering control apparatus in 2nd Embodiment. It is a figure explaining the conventional sintering process. It is explanatory drawing which shows the conventional sintering raw material charging device.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the feeder 2 of the sintering machine 1 includes a floor hopper 4 at the left end position where the sintering machine pallet 8 is folded from the lower side to the upper side, and a surge hopper disposed downstream thereof. 5 is provided as a raw material charging unit 31 as a raw material charging portion. In this sintering raw material charging device 31, fine-grained sintered ore cut out from the floor hopper 4 is spread on the great of the sintering machine pallet 8 to form a floor layer, on this floor layer. A sintering material quantitatively cut out from the surge hopper 5 is charged to form a charging layer (sintering bed) 9 having a predetermined thickness.

  As shown in FIG. 2, the surge hopper 5 is provided with a roll feeder 5a extending in the width direction at the lower end, and in contact with the outer peripheral surface of the roll feeder 5a and extending in the width direction to adjust the amount of raw material layers. A main gate 5b is provided, and a split gate 5c as a sub-gate composed of a plurality of gates divided in the width direction is provided outside the main gate 5b. The material layer thickness in the width direction can be adjusted. A hopper 5d is disposed below the divided gate 5c, and a drum chute 5e is disposed below the hopper 5d.

  Further, on the downstream side of the sintering raw material charging device 31, a required number, for example, four cut-off gates 32a to 32d are arranged in the width direction for flattening the upper surface of the charging layer 9. As shown in FIGS. 1 and 3, each of the cut-off gates 32a to 32d is connected to the vertical surface 32e of an isosceles triangle and the right and left inclined surfaces of the vertical surface 32e and extends to the surge hopper 5 side. The two inclined surfaces 32f are formed in a triangular pyramid shape.

  And the sintering raw material of the position where the layer thickness of the charging layer 9 is high is distributed to both sides by the inclined surface 32f by the cutoff gates 32a-32d. At this time, as shown in FIG. 3, a sintering raw material pool 32g is formed at the ridge line position where the two inclined surfaces 32f contact. A consolidation contribution portion 32h is formed on the front end side of the sintered raw material pool 32g on the surge hopper 5 side. The loading layer 9 on the lower surface side is pushed and consolidated by the load of the consolidation contribution portion 32h, whereby a consolidated region 32i is formed on the lower surface side of the cut-off gates 32a to 32d, and this consolidated region 32i is a sintering machine. As the pallet 8 moves, it is deployed downstream.

That is, the charging layer 9 before passing through the cut-off gates 32a to 32d in which the sintering raw material is charged onto the sintering machine pallet 8 by the sintering raw material charging device 31 is the width direction shown in FIG. The layer thickness is assumed to be In FIG. 4A, when the operation layer thickness when flattened by the cut-off gates 32a to 32d is set to, for example, 580 mm, over layer thickness regions Ao1 to Ao4 exceeding the operation layer thickness are formed. In addition, under layer thickness regions Au1 to Au5 lower than the operation layer thickness are formed.
When the charging layer 9 having the layer thickness shape of FIG. 4A is flattened by the cut-off gates 32a to 32d, as shown in FIG. 4B, the over-layer thickness regions Ao1 to Ao4 are regions requiring increased ventilation. And the under layer thickness regions Au1 to Au5 become lightly charged regions Al1 to Al5.

  As described above, when the consolidation regions Ac1 to Ac4 and the light charge regions Al1 to Al5 are formed in the width direction of the charge layer 9, in the compaction regions Ac1 to Ac4, the ventilation resistance increases, and in the light charge regions Al1 to Al5, Ventilation resistance is reduced. As described above, the charcoal material of the charging layer 9 is ignited by the ignition furnace 11, the gaseous fuel is injected from above the charging layer 9 by the gaseous fuel supply devices 12 a to 12 d, and the charging layer 9 is injected by the wind box 16. By suctioning from below, a melting / combustion zone that is maintained in an optimum temperature range for a predetermined time is formed, and when this melting / combustion zone descends sequentially as the sintering machine pallet 8 moves, the ventilation resistance In the consolidation regions Ac1 to Ac4 where the flow rate is large, the lowering speed of the melting / combustion zone is slower than that in the lightly charged regions Al1 to Al5 where the ventilation resistance is small.

  The influence of the sintering behavior due to the presence of the consolidation regions Ac1 to Ac4 was confirmed by a sintering pot test as shown in FIG. That is, the same sintering raw material as used in the applicant's company's sintering factory, using a tub-shaped tubular test pan (150 mmφ x 400 mmH) with a transparent quartz window, using propane gas as the gaseous fuel to be used That is, this is an example in which a sintering pot test was performed using the sintering raw materials shown in Table 1 under a constant downward suction pressure of 11.8 kPa.

In the sintering pot test shown in FIG. 5, as shown in FIG. 6A, an ideal uniform charging state (No. .1) and as shown in FIG. 6 (b), it is assumed that the operating layer thickness is excessively charged, and after the right half is excessively charged by 30 mm, the right-side consolidated state is consolidated with a half-moon shaped plate. (No. 2) and, as shown in FIG. 6 (c), a consolidation was created by simulating a ventilation rod in the consolidation region of FIG. 6 (b) and creating a space with a plate having a width of 10 mm, a depth of 180 mm, and a length of 200 mm. A sintering test was performed to photograph the shape of the combustion zone after 10 minutes of ignition in the three states of the ventilation rod insertion state (No. 3).
In the test result of FIG. In 1, the combustion zone is substantially horizontal and is uniformly sintered. The yield at this time was 73.3%, the sintering time was 15.8 minutes, and the production rate was 1.51 t / hr · m ² .

In addition, No. in the right-side consolidated state. In 2, the lowering of the combustion zone is delayed on the consolidated right side. The yield at this time was 68.5%, the sintering time was 17.7 minutes, the production rate was 1.32 t / hr · m ² , and the yield and sintering time deteriorated compared to the uniform charging state. The production rate has dropped significantly. For this reason, due to the presence of the compacted region, the uneven burning state of the charging layer 9 occurs, which affects the yield of the sintered ore, the sintering time, and the production rate.

In addition, No. in the state of right side consolidation and ventilation rod insertion. 3, by providing a gap corresponding to the insertion of the ventilation rod, the descent delay of the combustion zone is mitigated. At this time, the yield was 70.5%, the sintering time was 14.5 minutes, and the production rate was 1.56 t / hr · m ² . Compared with the uniform charge state of 1, the yield was lowered, but the production rate was improved by improving the sintering time.
Therefore, it was proved that the insertion of a ventilation rod is effective as a countermeasure against consolidation.
Therefore, as shown in FIG. 1, ventilation rods 33a to 33f that can be moved up and down at a predetermined interval in the width direction are disposed downstream of the cutoff gates 32a to 32d, and these ventilation rods 33a to 33f are arranged as shown in FIG. As shown in FIG. 4, the lift drive devices 34 a to 34 f are lifted and lowered, and the lift drive devices 34 a to 34 f are lifted and controlled by the lift control device 35.

By the way, the layer thickness shape in the width direction of the charging layer 9 formed by the sintering raw material charging device 31 does not always have a constant shape, but changes every moment as shown in FIG. For example, when a certain point in time is defined as 0 minutes, it has a layer thickness shape represented by a solid line shown in a thin line, but after 60 minutes it becomes a layer thickness shape represented by a solid line shown in a bold line, and after 120 minutes, a dotted line It changes to the layer thickness shape represented by. That is, the layer thickness in the width direction of the charging layer 9 formed on the sintering machine pallet 8 changes with time, and a portion where the layer thickness increases and a portion where the layer thickness decreases are mixed.
For this reason, in order to extract the consolidation regions Ac1 to Ac4, the thickness of the sintered raw material layer in the width direction of the charging layer 9 is continuously detected, and the overlayer thickness regions Ao1 to Ao4 exceeding the operation layer thickness are accurately detected. There is a need to.

  In order to continuously detect the thickness of the sintered raw material layer in the width direction of the charging layer 9, the surface layer of the raw material charging layer 9 is interposed between the drum chute 5e of the surge hopper 5 and the cutoff gates 32a to 32d. A layer thickness detection unit 40 for detecting the thickness is provided. The layer thickness detection unit 40 scans the surface of the raw material charging layer 9 formed on the sintering machine pallet 8 in the width direction orthogonal to the conveying direction of the sintering machine pallet 8 to obtain the layer thickness in the entire width direction. taking measurement. For the continuous measurement of the layer thickness, laser distance meters 41a to 41e that measure the distance with a laser characterized by a fast response speed and high measurement accuracy can be applied.

  For example, in the distance measurement method using an ultrasonic distance meter or the like, the measurement area is expanded to several hundred mm, whereas in the laser distance meter, the measurement point can be limited to a spot of several mm because of its excellent convergence. The position can be specified and measured. By scanning this laser distance meter in the sintering machine pallet width direction and measuring the layer thickness, it is possible to create a layer thickness profile measured accurately at each position.

There are several methods for scanning the layer thickness in the width direction. First, while measuring the layer thickness directly below the distance meter with one laser distance meter, the distance meter itself is moved in the full width section, This is a method of measuring the layer thickness at all positions in the width direction. However, in order to move one laser rangefinder in the width direction, it takes a movement time of about several tens of seconds. During that time, the sintering machine pallet 8 moves greatly in the machine length direction, so the machine length is measured while measuring in the width direction. It must also be taken into account that the measuring part is displaced in the direction. Moreover, since it repeatedly moves long in the full width direction, the load on the driving device is mechanically large and durability is required.
For this reason, it is also possible to move a plurality of distance meters by dividing the section into several sections in the width direction. However, since the apparatus becomes large and a large space is required for installation, the installation may be difficult depending on the existing equipment status of the charging section of the sintering machine.

  Therefore, in the present invention, in particular, a method of scanning the laser distance meter in a swinging manner at a fixed point was examined. The head swing type is a system in which a laser rangefinder installed at a fixed position is rotated within a cross section in the width direction and scanned on a line while changing the projection position of the laser beam. Hereinafter, this type of laser distance meter is referred to as a swing-type laser distance meter. Since this swinging laser rangefinder only rotates at a fixed position, the load on the apparatus drive system is small and it is extremely advantageous in terms of durability. Further, it is possible to divide the section in the width direction and synchronize a plurality of laser distance meters so as to scan the head at a fixed point. When the head is swung by one laser distance meter, it is necessary to install the laser distance meter at a high position above the sintering machine in order to scan the entire width of the sintering machine pallet 8. The reason is that when the laser beam is projected from a low position, a shadow portion where the laser beam does not hit is generated due to the angle of the inclined surface formed by the charged raw material, and a portion where measurement is impossible occurs.

  This principle will be described with reference to FIG. FIG. 9A shows a situation in which the laser distance meter 41 projects laser light from a low position. Since the angle of repose of the sintered raw material 42 is about 50 ° at the maximum, in this case, the black position is the non-measurable region 43. In order to eliminate the non-measurable region 43, it is necessary to measure in a range of a depression angle larger than that (for example, a depression angle of 60 ° or more). For this purpose, as shown in FIG. A high position is required for the installation position. In particular, since there are many opportunities for the raw material to form a high-angle slope in the side wall portion, it is preferable to arrange the laser distance meter 41 at a position close to the side wall in order to increase the depression angle of the laser beam.

  If installation at such a high position is difficult due to facilities, if the width direction section of the sintering machine pallet 8 is divided and scanned by a plurality of laser distance meters 41 in a swinging manner, It is possible to lower the installation position. The height of the laser distance meter 41 from the surface of the sintering raw material is 0.8 to 4.5 m, preferably 0.8, depending on the limitation of the measurement range of the laser distance meter 41 with a large depression angle of the laser beam. It is desirable to install in ~ 2m. When scanning with a plurality of units, the rotating operation of the laser distance meter 41 is synchronized, and all the width direction sections are scanned at once in a short time, so that the traveling distance of the sintering machine pallet during the scanning time is made extremely short. The deviation due to the pallet progression can be substantially ignored. It is better that the time required for one scan is short, and in reality, 10 seconds or less is desirable.

In the distance measurement by the laser distance meter 41, the distance is measured from the change in the incident angle of the reflected light to be detected with respect to the projection light. Therefore, when the laser distance meter is installed at a low position near the raw material surface, the change in the incident angle is detected greatly. Therefore, it becomes easy to detect a change in angle due to a minute change in distance, and an effect of improving the accuracy of distance determination can be obtained.
For this reason, as shown in FIG. 10, a frame 45 is provided extending in the width direction above the charging layer 9 of the sintering machine pallet 8, and is rotated to one of the front and rear surfaces of the frame 45, for example, the rear surface. Laser distance meters 41a to 41e are mounted on laser heads 46a to 46e as mechanisms, and the laser heads 46a to 46e are rotated synchronously within a predetermined angle range by a distance meter controller 47.

  This predetermined angle range is selected so that the laser distance meters 41j (j = a to d) and 41j + 1 adjacent to each other overlap on the charging layer 9 at the intermediate position between them. As described above, when the plurality of laser distance meters 41a to 41e are swung in a swinging manner, the laser distance meters 41a to 41e only rotate at a fixed position, so that the load on the apparatus drive system is small and durable. Very advantageous. Furthermore, by rotating the plurality of laser distance meters 41a to 41e synchronously and scanning them in a swinging manner, it becomes possible to measure the layer thickness of the entire loading layer 9 in the width direction by one scanning. . In this case, in the adjacent laser distance meters 41a to 41e, for example, by aligning all the angles of the rotation start positions to the maximum angle on one side of the rotation range, the laser light emitted from one of the adjacent laser distance meters It is preferable to reliably prevent the light from entering the other adjacent laser distance meter.

When these laser distance meters 41a to 41e are used, the measurement location can be limited to a spot of several mm because of its high convergence, so that the position can be specified and measured. The laser distance meters 41a to 41e are scanned in the width direction of the sintering machine pallet 8 to measure the layer thickness of the charging layer 9, thereby creating a profile of the layer thickness accurately measured at each position in the width direction. It becomes possible to do.
Thus, when scanning with a plurality of laser distance meters 41a to 41e in a swinging manner, the height from the top surface of the charging layer 9 is such that the depression angle of the laser light is large and the measurement range of the distance meter is It is desirable to install at 0.8 to 4.5 m, preferably 0.8 to 2 m depending on the limit.

Also, when scanning with multiple units, the pallet travel distance during the scanning time can be made extremely short by synchronizing the rotation of the laser rangefinder and scanning all sections at once in a short time. The displacement due to the pallet progression can be substantially ignored. It is better that the time required for one scan is short, and in reality, 10 seconds or less is desirable.
Here, the distances La to Le measured by the laser distance meters 41a to 41e and the rotation angles θa to θe with respect to the perpendicular passing through the rotation centers of the laser heads 46a to 46e at that time are the distance meter control devices described above. 47, and the distance meter control device 47 calculates the following formulas (1) and (2) to calculate the measurement position Wj (j = 1 to 6) and the material thickness Hj in the width direction.
Wj = WBj + Lj * sin θj (1)
Hj = HL−Lj * cos θj (2)

  Here, WBj is a distance from one end which is a reference point in the width direction of the rotation center point of each laser distance meter 41j, Lj is a measurement distance measured by each laser distance meter 41j, and θj is a rotation center of each laser head 46j. Is an elevation angle with respect to a perpendicular passing through the reference point side, and the reference point side is a negative value, and the opposite side of the reference point is a positive value. HL is the height from the upper surface of the sintering machine pallet 8 at the measurement origin of the laser distance meters 41a to 41e, that is, the rotation center of the laser heads 46a to 46e.

  The distance meter control device 47 stores the calculated measurement position Wj and raw material layer thickness Hj as a pair in the storage unit, and creates a profile of the layer thickness in the width direction. At this time, with respect to the surface position of the charging layer 9 that is overlapped by the adjacent laser distance meters 41a to 41e, the width direction position Wj with the smaller change between the measured width direction position and the previous width direction position, and The material layer thickness Hj is selected.

  That is, as shown in FIG. 11, the laser distance meter 41j has a steep inclined surface on the laser distance meter 41j side at the intermediate position between the laser distance meters 41j and 41j + 1, and a relatively gentle protrusion of the inclined surface on the opposite laser distance meter 41j + 1 side. In the case where the portion 48 is present, the laser distance meter 41j can measure all the distances including the top of the protruding portion 48, but the laser distance meter 41j + 1 has a steep portion beyond the top of the protruding portion 48. Since the inclined surface cannot be captured, the distance of the far flat portion is measured, and a large error occurs in the width direction position Wj + 1 (n) and the raw material layer thickness Hj + 1 (n), and the previous width direction position Wj + 1 ( The amount of change ΔW with respect to n-1) increases rapidly. For this reason, the width direction position Wj (n) and the raw material layer thickness Hj (n) based on the measurement value of the laser distance meter 41j with a small amount of change ΔW in the width direction position are selected.

  In this way, the width direction profile of the layer thickness Hj in the width direction of the charging layer 9 is measured every predetermined time (for example, 10 minutes), and the measured width direction profile of the layer thickness Hj is stored in the distance meter controller 47. Are sequentially stored in the storage unit 47a provided in the storage. The profile in the width direction of the layer thickness Hj stored in the storage unit 47a is sent to the lifting control device 35 described above, and the lifting control device 35 executes the ventilation rod lifting control process shown in FIG.

  In this ventilation rod lifting / lowering control process, the width direction profile of the layer thickness is stored in the storage unit 47a of the distance meter control device 47, and every time the stored width direction profile of the layer thickness is input, an interrupt to a predetermined main program is performed. It is executed as a process. First, in step S1, the width direction profile of the raw material layer thickness Hj input from the storage unit 47a is read, and then the process proceeds to step S2 to exceed the operation layer thickness Ho from the width direction profile of the raw material layer thickness Hj. It is determined whether or not there is an over-layer thickness region Aon (n = 1, 2,...) That becomes a ventilation required increase region whose width is equal to or greater than a predetermined width.

If the determination result of step S2 is that the over layer thickness region Aon does not exist, the process proceeds to step S3, where the bottom surfaces of the ventilation rods 33a to 33f are separated from the operation layer thickness Ho by a predetermined distance. After the elevation command value to be output is output to the elevation drive devices 34a to 34f, the ventilation rod elevation control process is terminated and the routine returns to a predetermined main program.
If the determination result of step S2 is that the over layer thickness region Aon exists, the process proceeds to step S4, where the over layer thickness region Aon is extracted, and the coordinates of the extracted over layer thickness region Aon in the width direction are extracted. And the maximum layer thickness Hmaxn are stored in the storage unit 35a built in the elevation controller 35, and then the process proceeds to step S5.

  In this step S5, the opposite ventilation rod 33k (k = a to f) is selected based on the width direction coordinate of each overlayer thickness region Aon stored in the storage unit 35a, and then the process proceeds to step S6 for selection. The insertion depth Dk with respect to the vent rod 33k is calculated based on the maximum layer thickness Hmaxn of the corresponding overlayer thickness region Aon. This insertion depth Dk is calculated by experimentally determining the relationship between the ventilation resistance of the consolidation region Acn formed by the maximum layer thickness Hmaxn of the overlayer thickness region Aon and the insertion depth D of the ventilation rods 33a to 33f. Storing an insertion depth calculation map representing the relationship between the maximum layer thickness Hmax and the insertion depth D, and calculating the insertion depth Dk with reference to the insertion depth calculation map based on the maximum layer thickness Hmax; Alternatively, an equation representing the relationship between the maximum layer thickness Hmax and the insertion depth D is obtained, and the insertion depth Dk is calculated by substituting the maximum layer thickness Hmax into this equation.

Next, the process proceeds to step S7, where the insertion depth Dk calculated for the raising / lowering drive device 34k of the selected ventilation rod 33k is output as an elevation command value and waiting for an unselected ventilation rod 33. After outputting as a lift command value as a position, the ventilation rod lift control process is terminated and the process returns to the main program.
Thus, by executing the ventilation rod lifting / lowering control processing shown in FIG. 12, the ventilation rod 33k can be inserted into the consolidation region Acn with the set insertion depth Dk. Thereby, the air permeability of the consolidation region Acn can be secured, and the yield, sintering time, and production rate during the sintering operation can be improved.

That is, the sintering raw material is charged by the sintering raw material charging device 31 to form the charging layer 9, and each laser distance of the layer thickness detector 40 disposed on the downstream side of the sintering raw material charging device 31. The profile of the layer thickness in the width direction of the charging layer 9 is measured by the total 41a to 41e.
In this state, the profile in the width direction layer thickness of the charging layer 9 is stored in the storage unit 47a of the distance meter control device 47, and when the profile in the width direction layer thickness is sent to the lift control device 35, the lift control is performed. In the device 35, when the profile in the width direction layer thickness is input, the execution of the above-described vent rod raising / lowering control process of FIG. 12 is started.

  For this reason, the profile in the width direction layer thickness is read (step S1), and then it is determined whether or not the over layer thickness region Aon exceeding the operation layer thickness Ho exists based on the read profile in the width direction layer thickness. However, when the over-layer thickness region Aon does not exist, an elevation command value as a standby position is output to the elevation drive devices 34a to 34f of the ventilation rods 33a to 33f (step S3). For this reason, each raising / lowering drive device 34a-34f makes each ventilation rod 33a-33f stand by in the standby position which spaced apart the bottom face from the operation layer thickness Ho of the charging layer 9 only the predetermined distance.

  However, as shown schematically in FIG. 1, the over-layer thickness region where the profile of the thickness in the width direction of the charging layer 9 measured by the laser distance meters 41 a to 41 e of the layer thickness detector 40 exceeds the operating layer thickness Ho. Assume that Ao11 and Ao12 are formed. In this case, when the width direction profile of the layer thickness is input to the lifting control device 35 and the ventilation rod lifting control process of FIG. 12 is executed, the process proceeds from step S2 to step S4, and the overlayer thickness region Ao11. -Ao12 are extracted, and the coordinate positions in the width direction of the extracted overlayer thickness regions Ao11 and Ao12 and the maximum layer thicknesses Hmax11 and Hmax12 are stored in the storage unit 35a.

  Next, the corresponding ventilation rods 33b and 33f facing the consolidation region are selected based on the stored coordinate positions in the width direction of the overlayer thickness regions Ao11 and Ao12 (step S5). Then, by referring to the insertion depth calculation map based on the maximum layer thicknesses Hmax11 and Hmax12 of the overlayer thickness regions Ao11 and Ao12, or by substituting the maximum layer thicknesses Hmax11 and Hmax12 into the insertion depth calculation equation. Then, the insertion depths D11 and D12 of the ventilation rods 33b and 33f are calculated (step S6).

And while raising / lowering command value showing insertion depth D11 and D12 is output with respect to the raising / lowering drive apparatuses 34b and 34f, the raising / lowering command value used as a standby position is output with respect to the remaining raising / lowering drive apparatuses 34a and 34c-34e. (Step S7). As a result, the ventilation rods 33b and 33f are lowered to the consolidation area as the ventilation required increase area by the elevation drive devices 34b and 34f, and as shown in FIG. 1, the insertion depth at which the ventilation bars 33b and 33f are the elevation command value is obtained. Lower until reaching D11 and D12. For this reason, ventilation grooves 36b and 36f are formed on the downstream side of the ventilation rods 33b and 33f.
Accordingly, the ventilation grooves 36b and 36f can reduce the ventilation resistance of the compacted region, can alleviate the decrease in the descending speed of the melting / combustion zone, and improve the yield of the sintering operation, the sintering time and the production rate. Can be made.

  FIG. 13 shows the effect of inserting a ventilation rod into the raw material compaction region in the sintering machine. The presence / absence of insertion of a ventilation rod in the compaction region formed in the charging layer 9 and the tumbler strength representing the sinter strength Shows the relationship. In 3/1 to 3/16 of the state where the ventilation rod is not inserted, the tumbler strength is maintained in the range of 73.2 to 75% and low, but the ventilation rod is inserted into the consolidation region at an insertion depth of 100 mm, for example. In 3/17 to 3/25, the tumbler strength is in a high range of 76.3 to 77.3%. Similarly, when the ventilation rod is not inserted into the consolidation region between 3/26 and 4/5, the tumbler strength decreases, and the ventilation rod is again inserted into the consolidation region between 4/6 and 4/19. By setting the insertion state, the tumbler strength is maintained at a high level even if the tumbler strength temporarily decreases to about 74.8. Thereafter, when the ventilation rod is not inserted into the consolidated region, the tumbler strength is lowered.

As can be seen from FIG. 13, by accurately detecting the raw material compaction region as the required air flow increasing region and inserting the vent rod 33k at the corresponding position among the vent rods 33a to 33f into the detected raw material compaction region. Further, the strength of the sintered ore can be improved.
In the first embodiment, the case where the ventilation control unit is configured by the ventilation rods 33a to 33f, the elevation drive devices 34a to 34f, and the elevation control device 35 has been described. However, the present invention is not limited to this. The larger the number of ventilation rods and lifting / lowering drive devices, the more preferable in the sense that the ventilation rods can be accurately inserted into the increased ventilation required region, and according to the layer thickness fluctuation when the sintering raw material is charged in the sintering machine. Any number of pairs of ventilation rods and lifting drive can be provided.

Next, a second embodiment of the present invention will be described with reference to FIGS.
In the second embodiment, ventilation in the compacted region is ensured with a small number of ventilation rods.
That is, in the second embodiment, as shown in FIGS. 14 and 15, the width direction of the charging layer 9 is divided into two at the center, and the ventilation rods 33g and 33h are moved up and down in the two divided regions, respectively. 34g and 34h are supported by a linear motion mechanism having a slider guided by a guide rail, for example, arranged on a frame 51 that is horizontally bridged on the charging layer 9 and is held up and down by 34g and 34h. The horizontal movement mechanisms 52a and 52b are arranged so as to be movable in the width direction, and the lifting drive devices 34g and 34h and the horizontal movement mechanisms 52a and 52b are driven and controlled by the lifting control device 35. 1 has the same configuration as that of FIG. 1, and the same reference numerals are given to corresponding parts to those of FIG. 1, and detailed description thereof will be omitted.

  In the second embodiment, the lifting control device 35 executes the ventilation rod lifting control process shown in FIG. 16 instead of the ventilation rod lifting control process of FIG. 12 described above. In this vent rod raising / lowering control process, the process of step S4 in the vent rod raising / lowering control process of FIG. 12 described above extracts the over layer thickness region Aon, and the maximum layer thickness Hmaxn of the extracted over layer thickness region Aon and the maximum After storing the position coordinate Wn in the width direction of the layer thickness Hmaxn in the storage unit 35a built in the elevation controller 35, the process proceeds to step S5, and the layer thickness of the maximum layer thickness Hmaxn of the overlayer thickness region Aon Step 15 is selected to select the large upper two overlayer thickness regions Aoh1 and Aoh2 as the increased ventilation required region. In addition, during the step S6 and the step S7, the horizontal direction coordinates Woh1 and Woh2 corresponding to the maximum layer thicknesses Hmaxh1 and Hmaxh2 of the overlayer thickness regions Aoh1 and Aoh2 as the ventilation required increase region selected in the step S15 are horizontally moved. Step S16 to be output to the corresponding horizontal movement mechanisms 52a and 52b as a command value, and whether or not the horizontal movement of the horizontal movement mechanisms 52a and 52b is completed, and wait until the horizontal movement is not completed. And step S17 which transfers to said step S7 when horizontal movement is completed is inserted.

According to the second embodiment, since the elevating drive devices 34g and 34h are fixed to the horizontal movement mechanisms 52a and 52b disposed on the frame 51, the ventilation rods 33g and 33h can freely move in the width direction. It has become.
For this reason, as shown in FIG. 14, the case where two overlayer thickness regions Ao11 and Ao12 are formed by the sintering raw material charging device 31 as in FIG. 1 in the first embodiment described above will be described. To do. In this case, since there are two overlayer thickness regions Ao11 and Ao12, in step S14, the maximum layer thicknesses Hmax11 and Hmax12 of the overlayer thickness regions Ao11 and Ao12 and the width direction coordinates Wo11 of these maximum layer thicknesses Hmax11 and Hmax12. And Wo12 are stored in the storage unit 35a, and the upper two layers having the largest maximum layer thickness Hmax are selected from the stored overlayer thickness regions in step S15. In this case, since there are two overlayer thickness regions Ao11 and Ao12, both overlayer thickness regions Ao11 and Ao12 are selected as the increased ventilation required region.

  Then, the insertion depths D11 and D12 are calculated for the maximum layer thicknesses Hmax11 and Hmax12 for the overlayer thickness regions Ao11 and Ao12 selected as the required ventilation increase region, and then the width direction coordinates W11 and the horizontal movement mechanisms 52a and 52b are calculated. W12 is output as the movement command value. Accordingly, the horizontal movement mechanisms 52a and 52b are positioned at the coordinate positions in the width direction of the maximum layer thicknesses Hmax11 and Hmax12 of the overlayer thickness regions Ao11 and Ao12, that is, at the center position of the consolidation region where the sintering raw material is consolidated by the cut-off gates 32a and 32d. The elevating drive devices 34g and 34h are moved.

  When the horizontal movement of the horizontal movement mechanisms 52a and 52b is completed, the elevation command values represented by the insertion depths D11 and D12 are output to the elevation drive devices 34g and 34h, thereby raising and lowering drive devices 34g and 34h. Then, the ventilation rods 33g and 33h are inserted into the consolidation region until the insertion depths D11 and D12 are reached. As a result, the ventilation rods 33g and 33h are inserted into the consolidation area, which is a required ventilation increase area, and the ventilation grooves 36g and 36h are formed on the downstream side of the ventilation bars 33g and 33h, which is the same as in the first embodiment described above. An effect can be obtained.

  In addition, according to the second embodiment, the two ventilation rods 33g and 33h, the lifting drive devices 34g and 34h that lift and lower them, the horizontal movement mechanism 52a that moves the lifting drive devices 34g and 34h in the width direction, and Therefore, the structure of the ventilation control unit can be simplified, and the ventilation rods 33g and 33h can be accurately inserted at the maximum layer thickness Hmax position of the overlayer thickness region. A ventilation groove can be formed at a position where the compaction is maximized to ensure good ventilation.

In the second embodiment, the case where the ventilation control unit including the two pairs of ventilation rods 33g and 33h, the lift drive devices 34g and 34h, and the horizontal movement mechanisms 52a and 52b is described. However, the ventilation control unit may be configured with three or more pairs of ventilation rods, a lifting drive device, and a horizontal movement mechanism.
Moreover, in the said 1st and 2nd embodiment, although the case where the laser distance meters 41a-41e were comprised by the swing type was demonstrated, it is not limited to this, A several laser distance meter is width direction The laser distance meters may be moved in synchronization with each other by being fixedly held by a moving mechanism that moves them, and what is necessary is that the layer thickness in the width direction of the charging layer 9 can be continuously measured.

  The technique of the present invention is useful as a technique for producing sintered ore used as a raw material for iron making, particularly as a blast furnace, but can also be used as another ore agglomeration technique.

DESCRIPTION OF SYMBOLS 1a ... Iron ore powder hopper, 1b ... Limestone hopper, 1c ... Returning hopper, 1d ... Powder coke hopper, 2 ... Drum mixer, 3 ... Sintering machine, 4 ... Floor hopper, 5 ... Surge hopper, 8 ... Sinter pallet , 9 ... charging layer, 11 ... ignition furnace, 12a to 12d ... gaseous fuel injection device, 16 ... wind box, 21 ... gaseous fuel supply part surrounding hood, 22 ... rectifying plate, 22a to 22c ... rectifying plate row, 23 ... Gas fuel injection nozzle, 31 ... Sintering raw material charging device, 32a to 32d ... Cut-off gate, 33a to 33f ... Ventilation rod, 34a to 34f ... Elevating drive device, 35 ... Elevating control device, 35a ... Storage unit, 40 ... Layer thickness detection unit, 41a to 41e ... laser distance meter, 46a to 46e ... laser head, 47 ... distance meter control device, 47a ... storage unit, 52a, 52b ... horizontal movement mechanism

Claims (6)

A droidoid-type sintering machine for producing sintered ore by sintering a sintering raw material charged on a sintering machine pallet;
A raw material charging portion for charging a sintered raw material onto the sintering machine pallet;
A layer thickness detector for continuously detecting the layer thickness in the width direction orthogonal to the conveying direction of the sintering machine pallet on the surface of the raw material charging layer charged in the upper part of the sintering machine pallet at the raw material charging unit; ,
A ventilation control unit that extracts a ventilation required increase area to be consolidated at the time of planarization based on the layer thickness in the width direction of the charging layer detected by the layer thickness detection unit, and inserts a ventilation rod into the extracted ventilation required increase area; A sintering machine comprising:   The layer thickness detector includes a rotation mechanism disposed at a predetermined height position above the sintering machine pallet, and a laser rangefinder rotatably supported by the rotation mechanism, The thickness of the raw material charging layer is continuously measured in the width direction of the sintering machine pallet by scanning the surface of the raw material charging layer by rotating the laser distance meter with the rotating mechanism. The sintering machine according to claim 1, wherein:   The layer thickness detector has a moving mechanism that moves in the width direction of the sintering machine pallet at a predetermined height position above the sintering machine pallet, and a laser distance meter attached to the moving mechanism, Measuring the layer thickness of the raw material charging layer continuously in the width direction of the sintering machine pallet by moving the laser distance meter with the moving mechanism and scanning the surface of the raw material charging layer. The sintering machine according to claim 1, wherein   4. The sintering machine according to claim 2, wherein the laser distance meter includes a plurality of laser distance meters arranged at predetermined intervals in the width direction of the sintering machine pallet. 5.   The ventilation control unit is configured to arrange a plurality of vertically movable ventilation rods in the width direction of the raw material charging layer, and to insert the ventilation rods opposed to the ventilation increase area. The sintering machine according to any one of claims 1 to 4, characterized in that: It is an operation method of a Dwightroid type sintering machine that sinters sintering raw materials charged on a sintering machine pallet to produce sintered ore,
Charging the sintering raw material at the upper part of the sintering machine pallet with a raw material charging unit;
Detecting the layer thickness in the width direction perpendicular to the conveying direction of the sintering machine pallet on the surface of the charging layer on the sintering machine pallet continuously with a layer thickness detector;
Extracting a required ventilation increase region to be consolidated at the time of flattening by the ventilation control unit based on the detected thickness of the charging layer in the width direction, and inserting a ventilation rod into the extracted increased ventilation requirement region;
A method for producing sintered ore, comprising: