Removal jig and removal method

Abstract

To provide a removal jig, etc. capable of removing a deposit adhered to an inner wall of a vertical furnace with a simple structure.SOLUTION: A removal jig removes a deposit adhered to an inner wall of a vertical furnace. The removal jig includes: a base part formed tabular; a protrusion formed projecting from at least one surface of the base part; and a connection member that hangs and holds the base part. The removal jig, etc. enable placement of the protrusion on, for example, a surface of a stave, which forms the inner wall of the vertical furnace, by operating the connection member, and enable removal of the deposit adhered to the stave by hanging up the removal jig in a state where the protrusion is positioned on the surface of the stave.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a removal jig for removing deposits adhering to the inner wall of a vertical furnace and a removal method.

Background Art

[0002] As one of the vertical furnaces, a blast furnace can be mentioned. In a blast furnace, for example, a cooling stave (hereinafter, also simply referred to as a stave) is provided as an inner wall above the tuyere. The staves are periodically replaced and renewed. Generally, in the renewal work of the staves, a scale-down operation is carried out in which the operation is carried out while lowering the stock line, which is the raw material filling level, while consuming the raw materials filled in the blast furnace.

[0003] Here, the staves provided above the tuyere of the blast furnace are provided inclined so that the lower side is lower toward the inside of the blast furnace. Therefore, when the scale-down operation is carried out, raw materials and the like may remain as deposits on the inclined surface of the stave.

[0004] The renewal work of the staves is carried out by lifting the existing staves with a lifting device. If the staves are lifted with deposits remaining thereon, the deposits may peel off and fall. When the deposits peel off, the weight changes suddenly, so there is a risk that the lifting device may fail or that unexpected behavior such as load swing may occur in the lifting device.

[0005] Furthermore, the maximum lifting weight of the lifting device is often not considered for the deposits on the staves. Therefore, when the lifting work is carried out exceeding the maximum lifting weight of the lifting device, there is a problem that the lifting device fails and the replacement of the staves becomes difficult.

[0006] Conventionally, deposits on the staves have been peeled off. For example, Patent Document 1 discloses that dynamite is inserted into the staves and detonated to drop the deposits on the staves.

[0007] Furthermore, Patent Document 2 discloses adjusting the amount of blasting agent and, after blasting, using a water jet to remove any residue from the stab. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2000-304456 [Patent Document 2] Patent No. 5348719 [Overview of the project] [Problems that the invention aims to solve]

[0009] When performing blasting as described in Patent Document 1, the blasting is carried out with all blast furnace equipment shut off to prevent stray currents from causing blasting at unintended times. This results in a problem of reduced blast furnace operating efficiency. In addition, there is a risk that components and equipment other than the staves may be damaged by the impact of the blasting.

[0010] Furthermore, as described in Patent Document 2, using a water jet results in a large amount of water flooding the blast furnace. This may cause a drop in the temperature at the bottom of the blast furnace when it is started up. In addition, under such conditions, there is a problem that the reduction reaction in the blast furnace is inhibited.

[0011] This invention has been made in view of the above-mentioned problems, and aims to provide a removal jig, etc., that can remove deposits adhering to the inner wall of a vertical furnace with a simple configuration. [Means for solving the problem]

[0012] To solve the above problems, the present invention has the following features. [1] A removal jig for removing deposits adhering to the inner wall of a vertical furnace, A base formed in the shape of a plate, A protrusion formed protruding from at least one surface of the base, A removal jig having a connecting member for suspending the base. [2] The aforementioned protrusion has one protrusion formed on the surface of the base parallel to one direction, and another protrusion formed on the surface of the base parallel to another direction different from the first direction. The first direction and the other direction are at an angle with respect to the suspension direction of the connecting member. The removal jig according to [1], wherein the first protrusion and the other protrusion are provided facing each other and the spacing between them widens as they move downward in the suspension direction. [3] The removal jig according to [1], wherein the protrusions are arranged in a row from above to below in the suspension direction of the connecting member. [4] The aforementioned connecting member is A first connecting member provided on one edge of the base, The device includes a second connecting member and a third connecting member, which are provided on the base so as to be movable in the direction of the protrusion of the convex portion, The third connecting member is provided below the second connecting member, and is a removal jig according to any one of [1] to [3]. [5] The removal jig according to [4], wherein the second connecting member and the third connecting member are arranged in a pair in the left-right direction when viewed from the suspension direction of the first connecting member. [6] The second connecting member is inserted through the first insertion hole provided in the wall of the vertical furnace. The third connecting member is inserted through a second insertion hole provided in the wall of the vertical furnace. The removal jig according to [4] or [5], wherein the distance from the second connecting member to the third connecting member in the suspension direction of the first connecting member is shorter than the distance from the first insertion hole to the second insertion hole in the suspension direction of the first connecting member. [7] A method for removing deposits adhering to the inner wall of a vertical furnace, A hanging step of hanging the removal jig according to any one of [1] to [6] to the position where the staves of the vertical furnace are provided, A contact step of bringing the convex portion into contact with the stave, And a lifting step of lifting the removal jig, the removal method. [8] In the contact step, the convex portion is brought into contact with the stave by using the second connecting member or the third connecting member of the removal jig according to any one of [4] to [6], After the contact step, the removal method according to [7], having a moving step of moving the removal jig up and down by adjusting the tension of at least one of the second connecting member and the third connecting member. [9] In the hanging step, the removal method according to [8], of hanging the removal jig according to [3] to the joint provided between two adjacent staves.

Effect of the Invention

[0013] According to the removal jig and the like of the present invention, by operating the connecting member, it becomes possible to position the convex portion on the surface of, for example, the stave which is the inner wall of the vertical furnace. By lifting the removal jig with the convex portion positioned on the surface of the stave, it becomes possible to remove the deposits adhering to the stave. Therefore, it becomes possible to remove the deposits adhering to the stave with a simple configuration.

Brief Description of the Drawings

[0014] [Figure 1] It is a perspective view of the removal jig. [Figure 2] It is a front view of the base of the removal jig. [Figure 3] It is an explanatory view showing a mode in which the second connecting member and the third connecting member of the removal jig are used. [Figure 4] It is a flowchart showing a removal method of removing deposits using the removal jig. [Figure 5]This is an explanatory diagram showing how to remove attached material using a removal jig. [Figure 6] This is a perspective view of the removal jig related to the modified form. [Figure 7] This is a perspective view of the removal jig according to the second embodiment. [Figure 8] This is an explanatory diagram showing how to remove attached material using the removal jig of the second embodiment. [Modes for carrying out the invention]

[0015] (First Embodiment) Embodiments of the present invention will be described below with reference to the drawings. Figure 1 shows the configuration of the removal jig. As shown in Figure 1, the removal jig 100 has a base portion 10, a protrusion 20 formed protruding from the surface of the base portion, and a connecting member 30 that suspends the base portion 10.

[0016] The base portion 10 is formed in a plate shape having a front surface 11 and a back surface 12. The base portion 10 only needs to have a shape having a front surface 11 and a back surface 12, and its dimensions such as width and height can be freely set. The base portion 10 has fixing portions 16 formed on its top surface 13, right side surface 14, and left side surface 15 for fixing the connecting member 30.

[0017] The fixing portion 16 has a mounting hole formed to allow the connecting member 30 to be inserted. In this embodiment, the fixing portion 16 is formed to protrude in a plate shape from the upper surface 13, right side surface 14, and left side surface 15 of the base portion 10. The fixing portion 16 is not limited to this form and only needs to have a mounting hole. For example, the fixing portion 16 may have a mounting hole formed through the front surface 11 and the back surface 12.

[0018] The protrusions 20 are formed to protrude from at least one of the surface 11 and the back surface 12 of the base 10. It is preferable that multiple protrusions 20 are formed on the base 10. It is preferable that each protrusion 20 is formed so that the tip end in the direction of protrusion becomes thinner. By forming the protrusions 20 in this way, it becomes possible to make the protrusions 20 bite into the attached material.

[0019] The connecting member 30 has a first connecting member 31, a second connecting member 32, and a third connecting member 33 connected to the fixing portion 16 of the base portion 10. The first connecting member 31, the second connecting member 32, and the third connecting member 33 are formed, for example, in the shape of a string. For example, wire can be used as the first connecting member 31, the second connecting member 32, and the third connecting member 33.

[0020] The first connecting member 31 is provided on one edge of the base 10. In this embodiment, the first connecting member 31 is connected to a fixing portion 16 provided on the upper surface 13 of the base 10. In this embodiment, only one first connecting member 31 is provided, but multiple first connecting members may be provided. The suspension direction D1 of the base 10 by the first connecting member 31 is in the vertical direction of the base 10.

[0021] The second connecting members 32 are arranged in pairs in the left-right direction when viewed from the suspension direction D1 of the first connecting member 31. One of the second connecting members 32 is connected to a fixing part 16 provided on the right side surface 14 of the base 10. The other second connecting member 32 is connected to a fixing part 16 provided on the left side surface 15 of the base 10. In this embodiment, two second connecting members 32 are provided, but this can be freely changed depending on the embodiment. The suspension direction D2 of the base 10 by the second connecting members 32 is along the direction perpendicular to the surface 11 of the base 10. In other words, the suspension direction D2 of the base 10 by the second connecting members 32 is along the protruding direction of the convex part 20.

[0022] The third connecting member 33 is provided below the second connecting member 32 and is arranged in pairs in the left-right direction when viewed from the suspension direction D1 of the first connecting member 31. One of the third connecting members 33 is connected to a fixing part 16 provided on the right side surface 14 of the base 10. The other third connecting member 33 is connected to a fixing part 16 provided on the left side surface 15 of the base 10. In this embodiment, two third connecting members 33 are provided, but this can be freely changed depending on the embodiment. The suspension direction D3 of the base 10 by the third connecting member 33 is along the direction perpendicular to the surface 11 of the base 10. In other words, the suspension direction D3 of the base 10 by the third connecting member 33 is along the protruding direction of the convex part 20.

[0023] Figure 2 shows the front view of the removal jig. As shown in Figure 2, the protrusion 20 has one protrusion 21 formed on the surface 11 of the base 10 parallel to one direction D4. The protrusion 20 has another protrusion 22 formed on the surface 11 of the base 10 parallel to another direction D5 different from the one direction D4.

[0024] One direction D4 forms an angle α with respect to the suspension direction D1 of the first connecting member 31. The other direction D5 forms an angle β with respect to the suspension direction D1 of the first connecting member 31. In this embodiment, angles α and β are acute angles.

[0025] One protrusion 21 and the other protrusion 22 are provided in a pair that face each other. The pair of one protrusion 21 and the other protrusion 22 are provided such that the spacing between them widens as they move downward in the suspension direction D1 of the first connecting member 31.

[0026] In this embodiment, the pair of protrusions 21 and 22 are arranged to form an inverted V shape when viewed from the front, with the tip of the V-shape positioned above the suspension direction D1. In this embodiment, the pair of protrusions 21 and 22 are arranged so that the tip of the V-shape is located in the center between the right side surface 14 and the left side surface 15.

[0027] Furthermore, the tips of one protrusion 21 and the other protrusion 22 that form the inverted V shape may be formed to abut each other. Also, a gap may be formed between the tips of the pair of protrusions 20 that form the inverted V shape.

[0028] As described above, the formation of the protrusion 20 reduces the contact area between the protrusion 20 and the attached material in the direction of movement of the removal jig 100. This reduces the initial contact resistance with the attached material when removing it with the removal jig 100. Furthermore, the contact area between the protrusion 20 and the attached material can be gradually increased during the removal operation. This prevents a sudden increase in resistance during the removal operation and increases the amount of attached material removed.

[0029] Figure 3 shows the second and third connecting members of the removal jig in use. In this embodiment, the removal jig 100 will be described in which it is used in a blast furnace as a vertical furnace. As shown in Figure 3, staves 44 are provided on the iron shell 41, which is the wall portion of the blast furnace 40. In addition, joints 45 are provided on the iron shell 41 between adjacent staves 44 in the circumferential direction of the blast furnace 40. In Figure 3, deposits 50 are attached to the surface of the staves 44.

[0030] The iron shell 41 is provided with a first through-hole 42 formed through the iron shell 41 in the thickness direction. The iron shell 41 is also provided with a second through-hole 43 formed through the iron shell 41 in the thickness direction and located below the first through-hole 42. The first through-hole 42 and the second through-hole 43 may be provided, for example, in positions corresponding to the joint holes 46 of the joint 45.

[0031] The second connecting member 32 is preferably inserted through the first insertion hole 42 and the joint hole 46. The tension of the second connecting member 32 inserted through the first insertion hole 42 is adjusted by an operator. The third connecting member 33 is preferably inserted through the second insertion hole 43 and the joint hole 46. The tension of the third connecting member 33 inserted through the second insertion hole 43 is adjusted by an operator.

[0032] Distance DB is the distance between the first insertion hole 42 and the second insertion hole 43 in the suspension direction D1 of the first connecting member 31. As shown in Figure 2, the distance DA from the fixed position of the second connecting member 32 to the fixed position of the third connecting member 33 in the suspension direction D1 of the first connecting member 31 should be shorter than distance DB.

[0033] By setting distances DA and DB in this manner, and adjusting the tensions of the second connecting member 32 and the third connecting member 33, the removal jig 100 can be moved up and down in fine increments. For example, by increasing the tension of the second connecting member 32 above that of the third connecting member 33, the removal jig 100 can be raised. Conversely, by increasing the tension of the third connecting member 33 above that of the second connecting member 32, the removal jig 100 can be lowered.

[0034] The removal method for removing deposits adhering to the inner wall of a blast furnace using the removal jig 100 described above will now be explained. Figure 4 shows the flow chart of the removal method for removing deposits.

[0035] As shown in Figure 4, in the removal method for removing deposits, the removal jig 100 is suspended to the position where the staves of the blast furnace 40 are located, and the suspension step (step S01) is performed. Next, the protrusion 20 is brought into contact with the staves 44, which are part of the wall of the blast furnace 40, and the contact step (step S02) is performed.

[0036] After the contact step in step S02, the removal jig 100 is moved up and down by adjusting the tension of at least one of the second connecting member 32 and the third connecting member 33, and the movement step is performed (step S03). Finally, the removal jig 100 is lifted up and the lifting step (step S04) is performed.

[0037] Figure 5 shows an example of removing deposits using the removal jig 100. As shown in Figure 5, in the suspension step of step S01, the removal jig 100 is suspended from the top of the blast furnace 40 using the first connecting member 31. The suspension step of step S01 ends when the removal jig 100 reaches the stave 44.

[0038] In the contact step of step S02, the protrusion 20 may be brought into contact with the stave 44 using the second connecting member or the third connecting member. Specifically, the second connecting member is inserted through the first insertion hole of the iron shell 41, and the third connecting member is inserted through the second insertion hole of the iron shell 41. When inserting the second connecting member through the first insertion hole, for example, a rod-shaped jig with a hook-shaped tip may be inserted into the first insertion hole, and the second connecting member may be engaged with the hook of the jig and pulled into the first insertion hole. The same procedure can be used when inserting the third connecting member through the second insertion hole.

[0039] The operator brings the protrusion 20 into contact with the stave 44, which is the wall of the blast furnace 40, by pulling the second or third connecting member closer. This allows the removal jig 100 to adhere tightly to the deposits on the stave 44. The deposits on the stave 44 include, for example, slag and coke. A characteristic of such deposits is that they are brittle and can crumble into large chunks with even slight impact.

[0040] In the movement step S03, the operator pulls the second connecting member closer, that is, increases the tension of the second connecting member above the tension of the third connecting member. This allows the operator to move the removal jig 100 upward.

[0041] Furthermore, the operator pulls the third connecting member closer, that is, increases the tension of the third connecting member above the tension of the second connecting member. This allows the operator to move the removal jig 100 downwards. The operator should move the removal jig 100 upwards at least once during the movement step of step S03.

[0042] In the lifting step of step S04, the first connecting member 31 is used to lift the removal jig 100 to the top of the blast furnace 40. The lifting step of step S04 ends when the removal jig 100 reaches the top of the furnace.

[0043] As described above, with the removal jig of the present invention, the protrusion 20 can be positioned on the surface of the stave 44 by operating the connecting member 30. By lifting the removal jig 100 with the protrusion 20 positioned on the surface of the stave 44, it is possible to remove the deposits attached to the stave 44. Therefore, it is possible to remove deposits attached to the stave 44 with a simple configuration.

[0044] In the above embodiment, a removal jig 100 equipped with a second connecting member and a third connecting member was described. The removal jig 100 only needs to be equipped with at least a first connecting member, and the second and third connecting members can be optionally provided on the removal jig 100. As described above, the adhering material has a brittle nature. For this reason, the adhering material may be detached by the impact when the protrusion 20 is positioned on the surface of the stave 44 using the first connecting member. Alternatively, the adhering material can be detached from the stave by pulling up the first connecting member at that time. When the removal jig 100 is configured in this way, the movement step S03 in Figure 4 does not need to be performed.

[0045] (modified version) In the above-described embodiment, an example was given in which a pair of protrusions 21 and another protrusion 22 are provided such that the tip of the V shape is located in the center between the right side surface 14 and the left side surface 15. The protrusions 20 are not limited to this embodiment and can be provided arbitrarily depending on the embodiment.

[0046] Figure 6 shows the configuration of a modified removal jig. Note that components identical to those in the first embodiment are denoted by the same reference numerals and their descriptions are omitted. As shown in Figure 6, the pair of protrusions 21 and 22 of the removal jig 200 are arranged so that they form an inverted V shape when viewed from the front. The pair of protrusions 21 and 22 are arranged in a row in the width direction of the base 10, that is, from the right side 14 to the left side 15. Even with this configuration of the protrusions 20, it is possible to remove deposits attached to the stave 44, similar to the first embodiment. Therefore, it is possible to remove deposits attached to the stave 44 with a simple configuration.

[0047] (Second Embodiment) In the above-described embodiment, an example was given in which the protrusion 20 is provided at an angle with respect to the suspension direction D1 of the first connecting member 31. The protrusion 20 is not limited to this configuration and can be provided in any shape depending on the embodiment.

[0048] Figure 7 shows the configuration of the removal jig according to the second embodiment. Components identical to those in the first embodiment are denoted by the same reference numerals and their descriptions are omitted. As shown in Figure 7, the protrusions 20 of the removal jig 300 are arranged in a row from above to below the suspension direction D1 of the first connecting member 31.

[0049] In this embodiment, the protrusions 20 are formed in a mountain shape such that the tip in the direction of protrusion becomes thinner. Each protrusion 20 is provided such that the distance between its vertices is constant. The distance between the vertices of each protrusion 20 is also referred to as the pitch.

[0050] The distance DA from the second connecting member 32 to the third connecting member 33 in the suspension direction D1 of the first connecting member 31 should be at least one pitch shorter than the distance DB from the first insertion hole 42 to the second insertion hole 43 in the suspension direction D1 of the first connecting member 31. This ensures sufficient distance for moving the removal jig 300 up and down.

[0051] Figure 8 shows an embodiment of removing deposits using the removal jig 300. As shown in Figure 8, in the suspension step of step S01 in Figure 4, the jig 300 is suspended from the top of the blast furnace 40 using the first connecting member 31. The suspension step of step S01 ends, for example, when the removal jig 300 reaches a joint 45 formed between adjacent staves 44. The joint 45 is preferably formed between staves arranged in the circumferential direction of the blast furnace 40.

[0052] In the contact step of step S02, the protrusion 20 is brought into contact with the joint 45 using the second or third connecting member. Specifically, the second connecting member 32 is inserted through the first insertion hole of the steel shell 41, and the third connecting member is inserted through the second insertion hole of the steel shell 41. The operator brings the protrusion 20 into contact with the joint 45, which is the wall of the blast furnace 40, by pulling the second or third connecting member closer. This allows the removal jig 300 to adhere tightly to any deposits on the joint 45.

[0053] In the movement step of step S03, the operator pulls the second connecting member closer, that is, increases the tension of the second connecting member above the tension of the third connecting member. This allows the operator to move the removal jig 300 upward.

[0054] Furthermore, the operator pulls the third connecting member closer, that is, increases the tension of the third connecting member above the tension of the second connecting member. This allows the operator to move the removal jig 300 downward. The operator should move the removal jig 300 upward at least once during the movement step of step S03.

[0055] In the lifting step of step S04, the first connecting member 31 is used to lift the removal jig 300 to the top of the blast furnace 40. The lifting step of step S04 ends when the removal jig 300 reaches the top of the furnace.

[0056] Thus, with the removal jig 300 of this embodiment, it is possible to scrape off deposits present in the joints formed between adjacent staves 44. As a result, deposits that have adhered across the staves 44 can be removed. Therefore, it becomes possible to perform the work as if detaching one of the staves 44 from the blast furnace 40.

[0057] Thus, even with the removal jig 300 configured in this way, it is possible to remove the deposits attached to the stave 44, just as in the first embodiment. Therefore, it is possible to remove the deposits attached to the stave 44 with a simple configuration.

[0058] In the embodiments described above, the blast furnace was explained as an example of a vertical furnace. The removal jig according to the present invention may also be used to remove deposits adhering to the inner wall of other vertical furnaces, such as cupolas. [Explanation of symbols]

[0059] 100, 200, 300 Removal Jig 10 base 20 Convex part 30 Connecting Members 31 First connecting member 32 Second connecting member 33 Third connecting member 42 First insertion hole 43 Second insertion hole D1 Suspension direction of the first connecting member

Claims

1. A removal jig for removing deposits adhering to the inner wall of a vertical furnace, A base formed in the shape of a plate, A protrusion formed protruding from at least one surface of the base, It has a connecting member that suspends the base, The aforementioned connecting member is A first connecting member provided on one edge of the base, The device includes a second connecting member and a third connecting member, which are provided on the base so as to be movable in the direction of the protrusion of the convex portion, The third connecting member is a removal jig provided below the second connecting member.

2. The aforementioned protrusion has one protrusion formed on the surface of the base parallel to one direction, and another protrusion formed on the surface of the base parallel to another direction different from the first direction. The first direction and the other direction are at an angle with respect to the suspension direction of the connecting member. The removal jig according to claim 1, wherein the first protrusion and the other protrusion are provided facing each other and the spacing between them widens as they move downward in the suspension direction.

3. The removal jig according to claim 1, wherein the protrusions are arranged in a row from above to below in the suspension direction of the connecting member.

4. The removal jig according to any one of claims 1 to 3, wherein the second connecting member and the third connecting member are arranged in a pair in the left-right direction when viewed from the suspension direction of the first connecting member.

5. The second connecting member is inserted through the first insertion hole provided in the wall of the vertical furnace. The third connecting member is inserted through a second insertion hole provided in the wall of the vertical furnace. The removal jig according to claim 1, wherein the distance from the second connecting member to the third connecting member in the suspension direction of the first connecting member is shorter than the distance from the first insertion hole to the second insertion hole in the suspension direction of the first connecting member.

6. A method for removing deposits adhering to the inner wall of a vertical furnace, A suspension step of suspending the removal jig according to any one of claims 1 to 3 to the position where the staves of the vertical furnace are provided, A contact step of bringing the protrusion into contact with the stave, The device includes a lifting step for lifting the removal jig, In the contact step, the protrusion is brought into contact with the stave using the second connecting member or the third connecting member of the removal jig according to any one of claims 1 to 3. A removal method comprising, after the contact step, a moving step of moving the removal jig up and down by adjusting the tension of at least one of the second connecting member and the third connecting member.

7. The removal method according to claim 6, wherein in the suspension step, the removal jig according to claim 3 is suspended down to a joint provided between two adjacent staves.

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