Pallet side wall, renewal method of pallet side wall and production apparatus of sintered ore

Abstract

To provide a pallet side wall, etc., that reduce an air leak caused by a gap formed between side walls.SOLUTION: Pallet side walls are provided on both end parts in a crosswise direction of a pallet into which sintered ore is loaded. At least one end part in a travel direction of the pallet includes plural protrusions formed extending in a height direction and formed protruding in the travel direction. The plural protrusions are arrayed at intervals in the crosswise direction of the pallet.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to pallet sidewalls provided at both ends in the width direction of a pallet into which sintered ore is charged, a pallet sidewall renewal method, and a sintered ore manufacturing apparatus. [Background technology]

[0002] When producing sintered ore, the raw materials are charged from a charging device and spread out on a cart called a pallet, and the surface layer is ignited in an ignition furnace. The pallet has a side wall to prevent the raw materials from spilling out.

[0003] The bottom of the pallet is connected to a main exhaust fan and is designed to allow ventilation. The exhaust gas generated by sintering the raw materials is sucked in by the main exhaust fan under negative pressure. Therefore, the sintering of the raw materials loaded on the pallet proceeds from the top layer to the bottom layer.

[0004] The raw materials loaded on the pallet are repeatedly heated and cooled. The sidewalls in contact with the raw materials are also made of cast iron and expand and contract with thermal changes. For this reason, a gap is provided between adjacent sidewalls in the moving direction of the pallet to prevent the sidewalls from contacting each other.

[0005] This gap between the sidewalls is one of the causes of air leakage. If air leakage occurs when negative pressure is sucked in by the main exhaust fan, the amount of air contributing to firing decreases, the firing speed drops, and the sintering productivity drops.

[0006] To address this issue, for example, Patent Document 1 discloses a method of attaching a seal plate to the end of the sidewall. The seal plate comes into contact with the end face of the sidewall and prevents gaps from being generated due to deformation of the sidewall.

[0007] In Patent Document 2, a seal member is provided in a groove provided in the end face of the sidewall. The seal members provided on adjacent pallets in the traveling direction come into contact with each other to close the gap between the sidewalls. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Utility Model Application Publication No. 5-8394 [Patent Document 2] JP 2020-180768 A Summary of the Invention [Problem to be solved by the invention]

[0009] The seal plate in Patent Document 1 has a pin hole formed therein. The seal plate is attached to the sidewall via a guide pin inserted into the pin hole. When a gap occurs between the sidewalls, the seal plate rotates around the axis of the guide pin by its own weight so as to close the gap.

[0010] However, in the seal plate of Patent Document 1, there is a risk that the seal plate will not rotate to the desired position due to dust getting caught in the guide pin, etc. This leads to poor contact between the seal plate and the sidewall, resulting in a problem of air leakage from the gap between them.

[0011] In addition, in Patent Document 2, the load is transferred to the sidewalls by contacting each other, and there is a risk that the sidewalls will push against each other and crack when thermally expanded or contracted. Furthermore, the seal members are required to have heat resistance so that they can be used in a high-temperature environment of about 1400°C where the sintering raw materials are fired. Also, at the end where the pallet advances to the endless track, a gap occurs between adjacent seal members, and then the contact state is restored, so the contacting seal members are required to have wear resistance. There is no material that has the above heat resistance and wear resistance and can maintain elasticity even when used for a long period of time.

[0012] In addition, in Patent Document 2, since the sidewalls come into contact with each other via the seal member, if one sidewall falls, there is a risk that the other adjacent sidewalls will also fall. In addition, for repairs or the like, the pallet is lifted from above by a crane or the like and removed from the sintering machine. At that time, if the seal plate is left attached, the working space becomes narrow, so there is a risk that the adjacent sidewalls will fall when the pallet swings. In order to avoid such a situation, the seal plate must be removed before lifting, which makes the work more complicated.

[0013] The present invention has been made in consideration of the above problems, and has an object to provide a pallet sidewall or the like that reduces air leakage caused by gaps formed between the sidewalls. [Means for solving the problem]

[0014] In order to solve the above problems, the present invention has the following features.

[0015] [1] A pallet sidewall provided at both ends in the width direction of the pallet into which sintered ore is charged, At least one end of the pallet in the traveling direction has a plurality of protruding portions formed to extend in a height direction and protrude along the traveling direction, A sidewall of a pallet, wherein the plurality of protrusions are arranged at intervals in the width direction of the pallet. [2] The sidewall is provided at a distance from the sidewall of another adjacent pallet in the moving direction of the pallet, The sidewall of a pallet described in [1], wherein the spacing between the multiple protrusions in the width direction of the pallet is 1.2 to 3.0 times the spacing between the sidewall and the sidewall of the other pallet. [3] the plurality of protruding portions include a plurality of first protruding portions formed to extend in a height direction, and a plurality of other protruding portions formed to extend in a direction forming an angle with respect to the one protruding portion, The sidewall of a pallet described in [1] or [2], wherein the other protrusions are arranged at intervals in the height direction. [4] removing at least one existing sidewall provided at both ends of the pallet in the width direction; and installing a pallet sidewall according to any one of [1] to [3] in the position of the removed sidewall. [5] A Dwight Lloyd-type sintered ore manufacturing apparatus having a circulating pallet on which raw materials for sintered ore are charged, and an ignition furnace for sintering the raw materials charged on the pallet, The pallet has side walls provided at both ends in the width direction thereof, The sidewall has a plurality of protrusions formed at at least one end in a traveling direction of the pallet and protruding along the traveling direction, The plurality of protrusions are arranged at intervals in the width direction of the pallet. Effect of the Invention

[0016] The sidewalls etc. of the pallet according to the present invention have a plurality of convex portions formed to protrude along the traveling direction at least on one end in the traveling direction of the pallet. As a result, the convex portions impede the progress of wind in the gap between the sidewall located on the leading side in the traveling direction of the pallet and the sidewall located on the trailing side. Furthermore, since the plurality of convex portions are arranged at intervals in the width direction of the pallet, negative pressure is generated in the gaps between the convex portions, causing wind vortices. As a result, the progress of wind is impeded in the width direction of the pallet. In other words, by impeding the progress of wind, it is possible to reduce wind leakage. [Brief description of the drawings]

[0017] [Figure 1] FIG. 2 is a configuration diagram of a sintered ore manufacturing apparatus. [Diagram 2] FIG. 2 is a perspective view of the pallet of FIG. 1. [Diagram 3] FIG. 2 is an explanatory diagram showing adjacent sidewalls in the traveling direction of the pallet. [Figure 4] FIG. 11 is an explanatory diagram showing a sidewall according to a modified example. [Diagram 5] FIG. 11 is a perspective view of a pallet according to a second embodiment. [Figure 6] 11 is a graph showing the arrangement of protrusions and the relative amount of air leakage. [Figure 7] 13 is a graph showing the number of protrusions and the relative amount of air leakage. [Figure 8] FIG. 10 is an explanatory diagram showing the state of wind flowing through the gap between adjacent sidewalls. [Figure 9] FIG. 10 is an explanatory diagram showing the state of wind flowing through the gap between adjacent sidewalls. [Figure 10] FIG. 10 is an explanatory diagram showing the state of wind flowing through the gap between adjacent sidewalls. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] (First embodiment) DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments thereof. Fig. 1 is a schematic diagram showing an example of a sintered ore manufacturing apparatus 100 for manufacturing sintered ore.

[0019] The sintered ore manufacturing apparatus 100 has a charging device 10 for storing the raw material for sintered ore (hereinafter also referred to as sintered raw material), a sintering machine 20 for sintering the sintered raw material supplied from the charging device, and a crusher 30 for crushing the sintered ore sintered by the sintering machine 20.

[0020] Examples of the components of the sinter raw material stored in the charging device 10 include iron-containing raw materials including various iron ores such as hematite and magnetite, CaO-containing raw materials including limestone and quicklime, MgO-containing raw materials including dolomite and refined nickel slag, and powdered coke. The iron-containing raw materials may include dust generated in the steelworks, which is blown up in the steelworks. The sinter raw materials may also include return ore, which is fine sintered ore that does not meet the specified size.

[0021] The sintering machine 20 is, for example, a downward suction type Dwight Lloyd type sintering machine. The sintering machine 20 has an endless moving pallet 21 that receives sintering raw materials from a charging device 10 and transports the sintering raw materials in one direction (hereinafter also referred to as the traveling direction). The sintering machine 20 has an ignition furnace 22 that is provided above the pallet 21 and sinters the sintering raw materials, and a wind box 23 that is provided below the pallet 21 and generates an air current that flows from above to below.

[0022] The sintering raw materials stored in the charging device 10 are charged onto a pallet 21. The solid arrow indicates the moving direction of the pallet 21. As shown in the figure, the pallet 21 is configured to be movable in a circulating manner.

[0023] The sintering raw material charged on the pallet 21 is adjusted in thickness by a cut gate (not shown) while being transported in the moving direction of the pallet 21 and is ignited by an ignition furnace 22 .

[0024] The dashed arrows in the figure indicate the direction of air flow. When air is sucked in by the wind box 23, an air current is generated that flows from above to below the pallet 21. As a result, the powdered coke and the coagulants, including anthracite, contained in the sintering raw materials are burned, and the burning and melting zone moves downward.

[0025] This forms a sintered cake in which the sintering raw materials are sintered. The sintered cake is crushed by the crusher 30 to form sintered ore. The sintered ore crushed by the crusher 30 is cooled by a cooler (not shown). The sintered ore cooled by the cooler is sieved by a sieving device (not shown) having multiple sieves, and is sieved into product sintered ore of a predetermined particle size or larger and return ore. The product sintered ore obtained in this manner is called sintered ore. The product sintered ore is charged into a blast furnace as a blast furnace raw material. The return ore sieved by the sieving device and not meeting the specified size can be reused as sintered raw material.

[0026] Fig. 2 shows the structure of the pallet 21. As shown in Fig. 2, the pallet 21 has a bottom 24 that extends in the left-right direction as viewed from the traveling direction DT, i.e., in the width direction DW of the pallet 21. The bottom 24 is formed such that the width direction DW of the pallet 21 is longer than the traveling direction DT of the pallet 21. The bottom 24 is formed in a grate shape by arranging grate bars 25 along the width direction DW of the pallet 21.

[0027] A pair of sidewalls 26 are provided on the bottom 24, extending upward from both ends in the width direction DW of the pallet 21. The sidewalls 26 are plate-shaped members extending in the short direction of the pallet 21 and extending in the height direction. The sidewalls 26 are provided on their inner surfaces with liners 27 that reduce wear due to contact with the sintering raw material.

[0028] The sidewall 26 has a plurality of protrusions 28 formed at at least one end in the traveling direction DT of the pallet 21 and protruding along the traveling direction DT. Each of the protrusions 28 is formed in a columnar shape. Each of the protrusions 28 is formed to extend in the height direction. Each of the protrusions 28 is arranged at intervals in the width direction DW of the pallet 21.

[0029] The sidewall 26 is not particularly limited, but may be formed, for example, using cast iron. The protrusion 28 is not particularly limited, but may be formed, for example, by cutting the sidewall 26 or by using a mold of the sidewall 26.

[0030] The pair of side walls 26 are formed so as to extend outward in the width direction DW of the pallet 21 as they extend upward.

[0031] Fig. 3 shows adjacent sidewalls in the traveling direction DT of the pallet 21. As shown in Fig. 3, in the traveling direction DT of the pallet 21, a space SP1 is provided between the sidewall 26a provided in the leading position and the sidewall 26b provided in the trailing position.

[0032] In this embodiment, the protrusions 28 are formed to protrude in the traveling direction DT of the pallet 21. The protrusions 28 are provided in the width direction DW of the pallet 21 at an interval SP2.

[0033] The arrows in Fig. 3 indicate the flow of wind. As shown in Fig. 3, wind flows from the outside of the width direction DW of the pallet 21 toward the raw materials 11 on the inside. At this time, the wind collides with the convex portion 28, and the position immediately thereafter becomes negative pressure. As a result, a vortex is generated immediately after the convex portion 28 in the traveling direction of the wind.

[0034] In this way, by providing the protrusions 28, the progress of the wind is hindered by the protrusions 28 in the space SP1 between the sidewalls 26a, 26b. In addition, the protrusions 28 generate negative pressure in the space SP2, generating a vortex. This hinders the progress of the wind in the width direction DW of the pallet 21. In other words, by hindering the progress of the wind, it is possible to reduce wind leakage.

[0035] The interval SP2 between the plurality of protrusions 28 in the width direction DW of the pallet 21 is preferably 1.2 to 3.0 times, and more preferably 1.5 to 2.5 times, the interval SP1 between the leading sidewall 26a and the trailing sidewall 26b. By setting the interval SP2 to 3.0 times or less the interval SP1 between the sidewalls 26a and 26b, it is possible to generate the above-mentioned vortex in an appropriate manner.

[0036] The amount of protrusion of the convex portion 28 in the traveling direction DT of the pallet 21 is not particularly limited as long as it can generate the above-mentioned vortex, but for example, it is good to have about 1 / 4 of the interval SP1, and it is preferable to have about 1 / 2 of the interval SP1. By making the amount of protrusion of the convex portion 28 in the traveling direction DT of the pallet 21 shorter than the interval SP1, it is possible to prevent the side walls from contacting each other. Furthermore, by making the amount of protrusion about 1 / 4 of the interval SP1, it is possible to appropriately generate vortexes and reduce air leakage.

[0037] When updating the sidewalls of the pallet described above, the following method for updating the sidewalls of the pallet is used. First, a step is performed in which at least one of the existing sidewalls provided at both ends in the width direction of the pallet is removed. Then, a step is performed in which the above-mentioned pallet sidewall is installed in the position of the removed sidewall.

[0038] (Modification) In the above embodiment, an example has been described in which the protrusion 28 is provided on the sidewall 26b located on the trailing side. The protrusion may be provided on the sidewall 26b located on the trailing side and the sidewall 26a located on the leading side.

[0039] Fig. 4 is an explanatory diagram showing a sidewall according to a modified example. As shown in Fig. 4, the sidewall 26a located on the leading side has a protrusion 28a arranged in the width direction DW of the pallet 21. The sidewall 26b located on the trailing side has a protrusion 28b arranged in the width direction DW of the pallet 21. The protrusions 28a are provided so as to be located between the protrusions 28b in the width direction DW of the pallet 21.

[0040] In this way, even if the protrusions 28a, 28b are provided on the trailing side side wall 26b and the leading side side wall 26a, it is possible to generate vortexes by the protrusions 28a, 28b, as in the first embodiment described above, and therefore it is possible to reduce wind leakage.

[0041] In the above modification, an example has been described in which one protrusion 28a is provided on the sidewall 26a located on the leading side. The manner in which the protrusion 28a is provided on the sidewall 26a located on the leading side is not limited to this, and multiple protrusions 28a may be arranged in the width direction DW of the pallet 21, as in the sidewall 26b located on the trailing side.

[0042] Second embodiment In the above embodiment, an example has been described in which the protrusions 28 are formed to extend in the height direction. The protrusions are not limited to this shape, and may be any shape that generates a vortex wind in the width direction DW of the pallet 21. Note that the same components as those in the first embodiment are denoted by the same reference numerals and will not be described.

[0043] Fig. 5 shows a sidewall 40 according to the second embodiment. As shown in Fig. 5, one protruding portion 41 formed to extend in the height direction and another protruding portion 42 formed to extend in a direction forming an angle with respect to the one protruding portion 41 are formed on the sidewall 40.

[0044] The first protrusion 41 can be formed in the same manner as the protrusion 28 described in the first embodiment.

[0045] In this embodiment, the other convex portion 42 is formed to extend along the width direction DW of the pallet 21. That is, the one convex portion 41 and the other convex portion 42 are formed to intersect with each other. In this embodiment, the one convex portion 41 and the other convex portion 42 are formed so as to form a rectangular lattice.

[0046] In this way, even when the first protrusion 41 and the second protrusion 42 are formed, it is possible to reduce air leakage, as in the first embodiment. In particular, by providing the second protrusion 42 on the sidewall 40, a vortex can be generated in the air flowing from above to below in the gap SP1 between the sidewalls 40. As a result, it is possible to enhance the effect of reducing air leakage. EXAMPLES

[0047] (Effect of convex parts on fluid) A convex portion was provided on one of the adjacent sidewalls in the direction of travel of the pallet, and a fluid analysis was performed when negative pressure suction was applied.

[0048] The spacing between the sidewalls was 4 mm. The protrusions were formed over the height direction of the sidewalls with a protrusion amount of 2 mm in the direction of travel of the pallet and 2 mm in the width direction of the pallet. The protrusions were arranged at intervals of 8 mm in the width direction of the pallet. Example 1 was prepared by providing protrusions in this manner as in the first embodiment. Example 2 was prepared by providing protrusions in a lattice pattern as in the second embodiment. The other protrusions in Example 2 were arranged at intervals of 8 mm.

[0049] The amount of air leakage was measured when no protrusions were provided on the sidewall. The amount of air leakage was also measured for Example 1 and Example 2. In Fig. 6, the amount of air leakage in Example 1 relative to the amount of air leakage in the case when no protrusions were provided on the sidewall, and the amount of air leakage in Example 2 relative to the amount of air leakage in the case when no protrusions were provided on the sidewall were calculated as relative air leakage.

[0050] Fig. 6 shows the relative amount of air leakage in Example 1 and Example 2. As shown in Fig. 6, the amount of air leakage is reduced by providing the convex portion. In particular, it was found that Example 2 has a higher reduction effect than Example 1 because it is possible to reduce air leakage from the top to the bottom in the height direction of the sidewall.

[0051] (Effect of the spacing of the convex parts in the width direction of the pallet on the fluid) A sidewall was produced in the manner described in Example 1. The spacing between the convex parts of the sidewall in the width direction of the pallet was set to 4 mm (pitch 4 mm), 8 mm (pitch 8 mm), and 12 mm (pitch 12 mm), and the amount of air leakage was calculated according to the number of convex parts. The results are shown in Figure 7.

[0052] As shown in FIG. 7, it was found that in all of the examples with a pitch of 4 mm, a pitch of 8 mm, and a pitch of 12 mm, the amount of air leakage decreased as the number of protrusions increased.

[0053] Figure 8 shows the state of wind flowing through the gap between sidewalls when the sidewalls are formed with a pitch of 4 mm. In Figure 8, velocity vectors are shown according to the shape of the arrow. Figure 8 also shows the level of the vector, with level 1 being the smallest vector and level 5 being the largest vector.

[0054] As shown in Fig. 8, in the area where the convex portion is not provided, the air flow path is formed as if it were wider. At the position where the flow path is wider, a wind of level 1 advances in a circular shape. That is, a wind vortex is generated in the area. Also, the vector level on the sidewall side where the convex portion is formed is lower than that on the sidewall side where the convex portion is not formed.

[0055] Fig. 9 shows the state of wind flowing through the gap between sidewalls when the sidewalls are formed with a pitch of 8 mm. In Fig. 9, velocity vectors according to the shape of arrows are shown, as in Fig. 8.

[0056] As shown in Figure 9, even in the case of a pitch of 8 mm, a level 1 wind advances in a circular shape in the position where the flow path is wide. That is, a wind vortex is generated in the region. Also, the vector level on the sidewall side where the convex portion is formed is lower than that on the sidewall side where the convex portion is not formed. Also, the level on the sidewall side where the convex portion is not formed is lower than that in the case of a pitch of 4 mm.

[0057] Fig. 10 shows the state of wind flowing through the gap between sidewalls when the sidewalls are formed with a pitch of 12 mm. In Fig. 10, velocity vectors according to the shape of arrows are shown, as in Fig. 8.

[0058] As shown in Figure 10, even with a 12mm pitch, level 1 wind advances in a circular shape in the position where the flow path is wider. That is, wind vortices are generated in the region. Also, in the region, vortices are not formed on the inside of the width direction of the pallet, which is different from the 4mm and 8mm pitches. With a 12mm pitch, there are areas in the region where such vortices cannot be formed, so the effect of reducing wind leakage is slightly weaker than with 4mm and 8mm pitches.

[0059] In addition, the vector level on the sidewall side where the convex portion is formed is lower than that on the sidewall side where the convex portion is not formed, and the level on the sidewall side where the convex portion is not formed is lower than that in the case of a pitch of 8 mm. [Explanation of symbols]

[0060] 100 Sintered ore manufacturing equipment 10 Charging device 11 Raw materials 20 Sintering machine 30 Crusher 40 Sidewall DT Pallet direction DW Pallet width direction

Claims

1. A pallet sidewall provided at both ends in the width direction of the pallet into which sintered ore is charged, At least one end of the pallet in the traveling direction has a plurality of protruding portions formed to extend in a height direction and protrude along the traveling direction, A sidewall of a pallet, wherein the plurality of protrusions are arranged at intervals in the width direction of the pallet.

2. The sidewall is provided at a distance from the sidewall of another adjacent pallet in the moving direction of the pallet, The sidewall of a pallet according to claim 1 , wherein the spacing between the multiple protrusions in the width direction of the pallet is 1.2 to 3.0 times the spacing between the sidewall and the sidewall of the other pallet.

3. the plurality of protruding portions include a plurality of first protruding portions formed to extend in a height direction, and a plurality of other protruding portions formed to extend in a direction forming an angle with respect to the one protruding portion, The sidewall of a pallet according to claim 1 , wherein the other protrusions are provided at intervals in the height direction.

4. the plurality of protruding portions include a plurality of first protruding portions formed to extend in a height direction, and a plurality of other protruding portions formed to extend in a direction forming an angle with respect to the one protruding portion, The sidewall of a pallet according to claim 2 , wherein the other protrusions are provided at intervals in the height direction.

5. removing at least one existing sidewall provided at both ends of the pallet in the width direction; and installing a pallet sidewall according to any one of claims 1 to 4 in place of the removed sidewall.

6. A Dwight Lloyd-type sintered ore manufacturing apparatus having a circulating pallet on which raw materials for sintered ore are charged, and an ignition furnace for sintering the raw materials charged on the pallet, The pallet has side walls provided at both ends in the width direction thereof, The sidewall has a plurality of protrusions formed at at least one end in a traveling direction of the pallet and protruding along the traveling direction, The plurality of protrusions are arranged at intervals in the width direction of the pallet.

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