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 tool and a removal method for removing deposits adhering to the inner wall of a vertical furnace. [Background technology]

[0002] One example of a vertical furnace is a blast furnace. In a blast furnace, for example, a cooling stave (hereinafter also simply referred to as a stave) is provided above the tuyere as an inner wall. The stave is periodically replaced and renewed. In general, in the renewal work of the stave, a reduced-scale operation is carried out in which the stock line, which is the raw material filling level, is lowered while consuming the raw materials filled in the blast furnace.

[0003] Here, the stave provided above the tuyere of the blast furnace is inclined so that the lower side is lower toward the inside of the blast furnace. For this reason, when the reduction operation is performed, raw materials and the like may remain as deposits on the inclined surface of the stave.

[0004] Stave renewal work is carried out by lifting the existing staves with a lifting device. If the stave is lifted with the remaining attachments, there is a risk that the attachments will peel off and fall. If the attachments peel off, the weight will change suddenly, which may cause the lifting device to break down or cause unexpected behavior such as load swinging.

[0005] Furthermore, the maximum lifting weight of the lifting device often does not take into account the attachments of the staves. Therefore, if the lifting work is performed exceeding the maximum lifting weight of the lifting device, the lifting device may break down and it may be difficult to replace the staves.

[0006] Conventionally, the attachments to the stave have been peeled off. For example, Patent Document 1 discloses that the attachments to the stave are removed by inserting dynamite into the stave and detonating it.

[0007] Moreover, Patent Document 2 discloses that the amount of blasting agent is adjusted, and after blasting, the deposits on the staves are removed by spraying with a water jet. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2000-304456 A [Patent Document 2] Patent No. 5348719 Summary of the Invention [Problem to be solved by the invention]

[0009] When performing the blasting described in Patent Document 1, the blasting is performed with all the equipment of the blast furnace turned off in order to prevent blasting at unintended timing due to stray current. This causes a problem of reduced operating efficiency of the blast furnace. In addition, there is a risk that the impact of the blasting may damage members and equipment other than the staves.

[0010] In addition, when a water jet is used as in Patent Document 2, a large amount of water is flooded into the blast furnace. This may lead to a decrease in the temperature of the lower part of the blast furnace when the blast furnace is started up. In addition, under such circumstances, there is a problem that the reduction reaction in the blast furnace is inhibited.

[0011] The present invention has been made in consideration of the above problems, and has an object to provide a removal tool, etc. that is simply configured and capable of removing deposits adhered to the inner wall of a vertical furnace. [Means for solving the problem]

[0012] In order to solve the above problems, the present invention has the following features. [1] A removal tool for removing deposits attached to the inner wall of a vertical furnace, A base portion formed in a plate shape; A protrusion formed to protrude from at least one surface of the base; a connection member that suspends the base portion. [2] the protrusions include one protrusion formed in parallel in one direction on the surface of the base, and another protrusion formed in parallel in another direction different from the one direction on the surface of the base, the one direction and the other direction form an angle with respect to a hanging direction of the connection member, The removal jig described in [1], wherein the one convex portion and the other convex portion are arranged opposite each other and are arranged so that the distance between them becomes wider as they go downward in the hanging direction. [3] The removal jig described in [1], wherein the protrusions are arranged in a row from top to bottom in the hanging direction of the connection member. [4] The connecting member is a first connecting member provided on one edge of the base; a second connection member and a third connection member provided on the base portion such that the base portion can be moved in a protruding direction of the convex portion, The removal jig according to any one of [1] to [3], wherein the third connection member is provided below the second connection member. [5] The removal jig described in [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 hanging direction of the first connecting member. [6] The second connection member is inserted into a first insertion hole provided in a wall portion of the vertical furnace, The third connection member is inserted into a second insertion hole provided in a wall portion of the vertical furnace, The removal jig described in [4] or [5], wherein the distance from the second connecting member to the third connecting member in the hanging direction of the first connecting member is shorter than the distance from the first insertion hole to the second insertion hole in the hanging direction of the first connecting member. [7] A method for removing deposits attached to an inner wall of a vertical furnace, comprising the steps of: A hanging step of hanging the removal jig according to any one of [1] to [6] to a position where the stave of the vertical furnace is provided; A contact step of contacting the protrusion with the stave; and a lifting step of lifting the removal jig. [8] In the contact step, the convex portion 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 [4] to [6], The removal method described in [7], further comprising 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 after the contact step. [9] The removal method according to [8], wherein in the hanging step, the removal jig according to [3] is hung up to a joint between two adjacent staves. Effect of the Invention

[0013] According to the removal tool of the present invention, by operating the connection member, it is possible to position the convex portion on the inner wall of the vertical furnace, for example, on the surface of the stave. By lifting the removal tool with the convex portion positioned on the surface of the stave, it is possible to remove the deposits attached to the stave. Therefore, it is possible to remove the deposits attached to the stave with a simple configuration. [Brief description of the drawings]

[0014] [Figure 1] FIG. [Diagram 2] FIG. 13 is a front view of the base of the removal tool. [Diagram 3] 13 is an explanatory view showing an embodiment in which a second connecting member and a third connecting member of the removal jig are used. FIG. [Figure 4] FIG. 1 is a flow diagram showing a method for removing deposits using a removal jig. [Diagram 5]FIG. 11 is an explanatory diagram showing a mode of removing a deposit using a removal jig. [Figure 6] FIG. 13 is a perspective view of a removal jig according to a modified example. [Figure 7] FIG. 11 is a perspective view of a removal tool according to a second embodiment. [Figure 8] 13 is an explanatory view showing a mode in which a deposit is removed by the removal jig of the second embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] (First embodiment) Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 shows the configuration of a removal jig. As shown in Fig. 1, the removal jig 100 has a base 10, a protrusion 20 formed to protrude from the surface of the base, and a connection member 30 that suspends the base 10.

[0016] The base 10 is formed in a plate shape having a front surface 11 and a back surface 12. The base 10 may have any shape as long as it has the front surface 11 and the back surface 12, and the dimensions such as the width and height can be freely set. The base 10 has fixing portions 16 formed on an upper surface 13, a right side surface 14, and a left side surface 15 for fixing the connecting member 30.

[0017] The fixing portion 16 has an attachment hole formed so that the connecting member 30 can be inserted therethrough. In this embodiment, the fixing portion 16 is formed in a plate shape protruding from the upper surface 13, the right side surface 14, and the left side surface 15 of the base 10. The fixing portion 16 is not limited to this form, and may have an attachment hole. The fixing portion 16 may be, for example, an attachment hole formed penetrating the front surface 11 and the back surface 12.

[0018] The protrusions 20 are formed to protrude from at least one of the front surface 11 and the back surface 12 of the base 10. It is preferable that a plurality of protrusions 20 are formed on the base 10. It is preferable that each protrusion 20 is formed so that the tip side in the protruding direction becomes thinner. By forming the protrusions 20 in this manner, it is possible for the protrusions 20 to bite into the attached matter.

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

[0020] The first connection member 31 is provided on one edge of the base 10. In this embodiment, the first connection member 31 is connected to a fixing portion 16 provided on an upper surface 13 of the base 10. Although one first connection member 31 is provided in this embodiment, a plurality of first connection members may be provided. The hanging direction D1 of the base 10 by the first connection member 31 is the up-down direction of the base 10.

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

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

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

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

[0025] The one protrusion 21 and the other protrusion 22 are provided to face each other and form a pair. The one protrusion 21 and the other protrusion 22 of the pair are provided such that the distance between them becomes wider as they go downward in the hanging direction D1 of the first connection member 31.

[0026] In this embodiment, the pair of one protrusion 21 and the other protrusion 22 are provided so as to form an inverted V shape in a front view with the tip side of the V shape disposed upward in the hanging direction D1. In this embodiment, the pair of one protrusion 21 and the other protrusion 22 are provided so that the tip side of the V shape is located in the center between the right side surface 14 and the left side surface 15.

[0027] The tip sides of the pair of protrusions 21 and 22 forming the inverted V shape may be formed to abut against each other. Also, a gap may be formed between the tip sides of the pair of protrusions 20 forming the inverted V shape.

[0028] In this way, by forming the protrusions 20, it is possible to reduce the contact area between the protrusions 20 and the attachment in the movement direction of the removal jig 100. This makes it possible to reduce the initial contact resistance with the attachment when the removal jig 100 is used to remove the attachment. Also, it is possible to gradually increase the contact area between the protrusions 20 and the attachment when performing the removal operation. This makes it possible to prevent a sudden increase in resistance when performing the removal operation and to increase the amount of attachment removed.

[0029] FIG. 3 shows an embodiment in which the second connecting member and the third connecting member of the removal jig are used. In this embodiment, an embodiment in which the removal jig 100 is used in a blast furnace as a vertical furnace will be described. As shown in FIG. 3, a stave 44 is provided on a shell 41 which is a wall of the blast furnace 40. In addition, a joint 45 is provided on the shell 41 between adjacent staves 44 in the circumferential direction of the blast furnace 40. In FIG. 3, an attachment 50 is attached to the surface of the stave 44.

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

[0031] The second connecting member 32 may be 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 may be 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] The distance from the first insertion hole 42 to the second insertion hole 43 in the hanging direction D1 of the first connecting member 31 is defined as a distance DB. It is preferable that 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 hanging direction D1 of the first connecting member 31, as shown in FIG. 2, is shorter than the distance DB.

[0033] By setting the 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 tool 100 can be moved up and down in a precise manner. For example, by making the tension of the second connecting member 32 higher than the tension of the third connecting member 33, the removal tool 100 can be raised. Also, by making the tension of the third connecting member 33 higher than the tension of the second connecting member 32, the removal tool 100 can be lowered.

[0034] A method for removing deposits adhering to the inner wall of a blast furnace using the above-described removal jig 100 will be described below. Fig. 4 shows a flow chart of the method for removing deposits.

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

[0036] After the contact step of step S02, the removal tool 100 is moved up and down by adjusting the tension of at least one of the second connection member 32 and the third connection member 33, thereby performing a moving step (step S03). Finally, the removal tool 100 is lifted up, and a lifting step (step S04) is performed.

[0037] Fig. 5 shows an aspect of removing the deposit by the removal jig 100. As shown in Fig. 5, in the hanging step of step S01, the removal jig 100 is hung from the top of the blast furnace 40 by using the first connecting member 31. The hanging 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 into the first insertion hole of the steel shell 41, and the third connecting member is inserted into the second insertion hole of the steel shell 41. When the second connecting member is inserted into the first insertion hole, for example, a rod-shaped jig having a hook-shaped tip is inserted into the first insertion hole, and the second connecting member is engaged with the hook of the jig and pulled into the first insertion hole. The third connecting member can be inserted into the second insertion hole in the same manner.

[0039] The operator brings the protrusion 20 into contact with the stave 44, which is a wall of the blast furnace 40, by pulling the second connecting member or the third connecting member. This allows the removal jig 100 to be in close contact with the deposits attached to the stave 44. The deposits attached to the stave 44 include, for example, slag, coke, etc. One characteristic of such deposits is that they are brittle, such that a small impact causes the lumps to crumble.

[0040] In the movement step of step S03, the operator pulls the second connection member, i.e., makes the tension of the second connection member higher than the tension of the third connection member, thereby allowing the operator to move the removal tool 100 upward.

[0041] The operator also pulls the third connection member, i.e., makes the tension of the third connection member higher than the tension of the second connection member. This allows the operator to move the removal tool 100 downward. It is preferable that the operator move the removal tool 100 upward at least once in the movement step of step S03.

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

[0043] As described above, according to the removal jig etc. of the present invention, by operating the connection member 30, it is possible to position the protrusion 20 on the surface of the stave 44. 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 the deposits attached to the stave 44 with a simple configuration.

[0044] In the above embodiment, the removal jig 100 provided with the second connection member and the third connection member has been described. It is sufficient that at least the first connection member is provided in the removal jig 100, and the second connection member and the third connection member are arbitrarily provided in the removal jig 100. As described above, the deposit has a brittle nature. For this reason, the deposit may be peeled off by the impact when the protrusion 20 is positioned on the surface of the stave 44 using the first connection member. In addition, the deposit can be peeled off from the stave by pulling up the first connection member at that time. When the removal jig 100 is configured in this way, the movement step of step S03 in FIG. 4 does not need to be performed.

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

[0046] FIG. 6 shows the configuration of a removal jig according to a modified example. The same components as those in the first embodiment are denoted by the same reference numerals and will not be described. As shown in FIG. 6, the pair of one convex portion 21 and the other convex portion 22 of the removal jig 200 are provided so as to form an inverted V shape in front view. The pair of one convex portion 21 and the other convex portion 22 are provided so as to form a row in the width direction of the base 10, that is, in the direction from the right side surface 14 to the left side surface 15. Even if the convex portion 20 is configured in this way, it is possible to remove the deposits attached to the stave 44 in the same way as in the first embodiment. Therefore, it is possible to remove the deposits attached to the stave 44 with a simple configuration.

[0047] Second embodiment In the above-described embodiment, an example has been described in which the protrusion 20 is provided at an angle with respect to the hanging direction D1 of the first connection member 31. The protrusion 20 is not limited to this aspect, and can be provided in any shape depending on the aspect of the embodiment.

[0048] Fig. 7 shows the configuration of a removal jig according to the second embodiment. The same components as those in the first embodiment are denoted by the same reference numerals and will not be described. As shown in Fig. 7, a plurality of protrusions 20 of the removal jig 300 are arranged in a row from above to below in the hanging direction D1 of the first connection member 31.

[0049] In this embodiment, the protrusions 20 are formed in a mountain shape so that the tip side in the protruding direction becomes thinner. The protrusions 20 are provided so that the distance between the apexes is constant. The distance between the apexes of the protrusions 20 is also called the pitch.

[0050] It is preferable that the distance DA from the second connecting member 32 to the third connecting member 33 in the hanging direction D1 of the first connecting member 31 is shorter by at least one pitch than the distance DB from the first insertion hole 42 to the second insertion hole 43 in the hanging direction D1 of the first connecting member 31. By doing so, it is possible to ensure a sufficient distance for moving the removal jig 300 up and down.

[0051] 8 shows an aspect of removing the deposit by the removal jig 300. As shown in FIG. 8, in the hanging step of step S01 in FIG. 4, the removal jig 300 is hung from the top of the blast furnace 40 using the first connecting member 31. The hanging step of step S01 ends, for example, when the removal jig 300 reaches a joint 45 formed between adjacent staves 44. The joint 45 may be formed between staves arranged in the circumferential direction of the blast furnace 40.

[0052] In the contact step of step S02, the second connection member or the third connection member is used to bring the protrusion 20 into contact with the joint 45. Specifically, the second connection member 32 is inserted into the first insertion hole of the steel shell 41, and the third connection member is inserted into the second insertion hole of the steel shell 41. The operator pulls the second connection member or the third connection member to bring the protrusion 20 into contact with the joint 45, which is the wall of the blast furnace 40. This allows the removal jig 300 to be tightly attached to the deposit attached to the joint 45.

[0053] In the movement step of step S03, the operator pulls the second connection member, i.e., makes the tension of the second connection member higher than the tension of the third connection member, thereby allowing the operator to move the removal tool 300 upward.

[0054] The operator also pulls the third connection member, i.e., makes the tension of the third connection member higher than the tension of the second connection member. This allows the operator to move downward the removal jig 300. It is preferable that the operator move the removal jig 300 upward at least once in the movement step of step S03.

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

[0056] In this way, according to the removal jig 300 of the present embodiment, it is possible to scrape off the deposits present in the joints formed between the adjacent staves 44. As a result, it is possible to remove the deposits that have been deposited across the staves 44. For this reason, it is possible to perform the same work as when peeling off one of the staves 44 from the blast furnace 40.

[0057] Even if the removal jig 300 is configured in this manner, it is possible to remove the deposits attached to the stave 44, similarly to the first embodiment. Therefore, it is possible to remove the deposits attached to the stave 44 with a simple configuration.

[0058] In the above embodiment, the blast furnace has been described as an example of a vertical furnace. The removal jig according to the present invention may be used to remove deposits attached to the inner wall of a vertical furnace other than a blast furnace, such as a cupola. [Explanation of symbols]

[0059] 100, 200, 300 Removal jig 10 base 20 Convex 30 Connection member 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 tool for removing deposits attached to the inner wall of a vertical furnace, A base portion formed in a plate shape; A protrusion formed to protrude from at least one surface of the base; a connection member that suspends the base portion.

2. the protrusions include one protrusion formed in parallel in one direction on the surface of the base, and another protrusion formed in parallel in another direction different from the one direction on the surface of the base, the one direction and the other direction form an angle with respect to a hanging direction of the connection member, The removal jig according to claim 1 , wherein the one protrusion and the other protrusion are provided opposite to each other and are spaced apart from each other such that the distance therebetween increases downward in the hanging direction.

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

4. The connecting member is a first connecting member provided on one edge of the base; a second connection member and a third connection member provided on the base portion such that the base portion can be moved in a protruding direction of the convex portion, The removal tool according to any one of claims 1 to 3, wherein the third connection member is provided below the second connection member.

5. The removal jig according to claim 4 , wherein the second connection member and the third connection member are arranged in pairs in the left-right direction when viewed from a hanging direction of the first connection member.

6. The second connection member is inserted into a first insertion hole provided in a wall portion of the vertical furnace, The third connection member is inserted into a second insertion hole provided in a wall portion of the vertical furnace, 5. The removal jig according to claim 4, wherein a distance from the second connection member to the third connection member in a hanging direction of the first connection member is shorter than a distance from a first insertion hole to a second insertion hole in the hanging direction of the first connection member.

7. The second connection member is inserted into a first insertion hole provided in a wall portion of the vertical furnace, The third connection member is inserted into a second insertion hole provided in a wall portion of the vertical furnace, 6. The removal jig according to claim 5, wherein a distance from the second connection member to the third connection member in a hanging direction of the first connection member is shorter than a distance from a first insertion hole to a second insertion hole in the hanging direction of the first connection member.

8. A method for removing deposits attached to an inner wall of a vertical furnace, comprising the steps of: A hanging step of hanging the removal jig according to any one of claims 1 to 3 to a position where the stave of the vertical furnace is provided; A contact step of contacting the protrusion with the stave; and a lifting step of lifting the removal jig.

9. In the contact step, the convex portion is brought into contact with the stave using the second connecting member or the third connecting member of the removal jig according to claim 4, The removal method according to claim 8 , further comprising, after the contact step, a moving step of moving the removal jig up and down by adjusting a tension of at least one of the second connection member and the third connection member.

10. The removal method according to claim 9, wherein in the hanging step, the removal jig according to claim 3 is hung up to a joint provided between two adjacent staves.

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