Furnace wall cooling device

Abstract

To provide a furnace wall cooling system that can suppress the occurrence of water leakage. [Solution] A furnace wall cooling device formed in a plate shape with a water channel formed inside. The water channel of the furnace wall cooling device has a through-hole that penetrates either the upper surface or the lower surface formed between the upper and lower surfaces. The through-hole is closed by a first closing member and a second closing member provided to cover the first closing member. According to the furnace wall cooling device of the present invention, the through-hole formed penetrating from the upper or lower surface to the water channel is closed by a first closing member and a second closing member. This makes it possible to reduce the effect of heat on the first closing member and the effect of wear on the first closing member due to collision with raw materials. Therefore, it is possible to suppress the occurrence of water leakage.

Description

Technical Field

[0001] The present invention relates to a furnace wall cooling device formed in a plate shape and having a water channel formed therein.

Background Art

[0002] Furnace wall cooling devices are provided in the furnace bodies of blast furnaces and electric furnaces to reduce the heat load. For example, blast furnaces are provided with stave for cooling the furnace wall (hereinafter also referred to as "stave"). The stave is formed in a plate shape and has a water channel for cooling formed therein.

[0003] The stave is exposed to high temperatures during the operation of the blast furnace. In addition, when raw materials are charged from above, the stave is worn and deformed due to collisions with the raw materials. When the stave is exposed to such an environment for a long time, the water channel formed therein is damaged. When the water channel is damaged, cooling water enters the blast furnace, deteriorating the operating state. When such leakage of cooling water occurs, the stave is replaced.

[0004] Suppression of such leakage of cooling water has been carried out. For example, Patent Document 1 discloses a stave having a protrusion protruding toward the inside of the blast furnace, and the protrusion is installed away from the upper end.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Even in the above conventional technology, the above problems due to water leakage cannot be sufficiently solved, and further improvement is desired.

[0007] This invention has been made in view of the above-mentioned problems, and aims to provide a furnace wall cooling device that can suppress the occurrence of water leakage. [Means for solving the problem]

[0008] To solve the above problems, the present invention has the following features.

[0009] [1] A furnace wall cooling device formed in a plate shape and having a water channel formed inside, The waterway has a through portion that penetrates either the upper surface or the lower surface formed between the upper and lower surfaces, A furnace wall cooling device in which the penetration is closed by a first closing member and a second closing member provided to cover the first closing member. [2] The furnace wall cooling device according to [1], wherein the second blocking member has a through hole formed in the direction of the formation of the through portion. [3] A furnace wall cooling device according to [1] or [2], wherein a refractory material is filled between the first closing member and the second closing member. [4] A furnace wall cooling device formed in a plate shape and having a water channel formed inside, The waterway has a penetration portion that penetrates the upper surface formed between the surface and the back surface, The aforementioned penetration is closed by the first closing member. The top surface of the first blocking member is positioned in a recessed area from the upper surface, in a furnace wall cooling device. [Effects of the Invention]

[0010] According to the furnace wall cooling device of the present invention, the penetration portion formed extending from the upper or lower surface to the water channel is closed by a first closing member and a second closing member provided to cover the first closing member. This reduces the effects of heat on the first closing member and the effects of wear on the first closing member due to collision with raw materials. Therefore, it is possible to suppress the occurrence of water leakage. [Brief explanation of the drawing]

[0011] [Figure 1] This is an explanatory diagram showing an embodiment in which a furnace wall cooling system is installed in a blast furnace. [Figure 2] This is a cross-sectional view of the stave. [Figure 3] This is an immediate cross-sectional view of the stave according to the second embodiment. [Figure 4] This is an explanatory diagram showing the configuration of the stab when raw materials are loaded. [Figure 5] This is an explanatory diagram showing another configuration example of the second closure member. [Figure 6] This is an explanatory diagram showing another configuration example of the second closure member. [Modes for carrying out the invention]

[0012] (First Embodiment) The present invention will be described below through embodiments of the invention. Figure 1 shows a configuration in which a stave 20 as a furnace wall cooling device is provided on the iron shell 10 of a blast furnace 100. Note that the furnace wall cooling device can be any device that cools the furnace wall which becomes hot, and is not limited to the blast furnace 100, but may be used in an electric furnace, for example. In this embodiment, a stave 20 that cools the iron shell 10 of the blast furnace 100 will be described as a furnace wall cooling device.

[0013] As shown in Figure 1, the blast furnace 100 is formed in a cylindrical shape. The blast furnace 100 is not particularly limited, but for example, it has a diameter of 17 m and a height of 40 m. The blast furnace 100 has an iron shell 10 on its outermost circumference. The staves 20 are provided so as to cover the iron shell 10 of the blast furnace 100.

[0014] The stave 20 is formed of a material having excellent thermal conductivity, such as, for example, cast iron, copper, copper alloy, etc., although not particularly limited. The stave 20 is formed, for example, in a plate shape having a rectangular front view.

[0015] The size of the stave 20 is not particularly limited. For example, considering cooling capacity and workability, it is formed to have a height of 2.0 m, a width of 1.3 m, and a thickness of 0.2 m. In the blast furnace 100, the staves 20 are provided, for example, in about 16 stages in the height direction and about 40 pieces in the circumferential direction.

[0016] A water channel 21 is formed inside the stave 20. In the present embodiment, the water channel 21 is formed to extend in the vertical direction. The number of the water channels 21 is not particularly limited, but in the present embodiment, they are formed at six locations.

[0017] FIG. 2 shows a side cross-section of the stave 20. The water channel 21 is connected to a water supply connection part 22 provided below. Also, the water channel 21 is connected to a drainage connection part 23 provided above. Therefore, in the present embodiment, cooling water is supplied from the water supply connection part provided below to the water channel 21, and the cooling water is drained from the drainage connection part 23 provided above.

[0018] The stave 20 has a front surface 24 disposed toward the inside of the blast furnace 100 and a back surface 25 disposed toward the outside of the blast furnace 100. The stave 20 has an upper surface 26 formed between the front surface 24 and the back surface 25 and located above. The stave 20 has a lower surface 27 formed between the front surface 24 and the back surface 25 and located below.

[0019] The waterway 21 is formed, for example, by boring from the upper surface 26 or the lower surface 27. In the example shown in Figure 2, the waterway 21 has a through-hole 28 that penetrates the lower surface 27. The through-hole 28 is formed when the waterway 21 is formed from the lower surface 27. The through-hole 28 is closed by a first closing member 30 and a second closing member 40 which is provided to cover the first closing member 30.

[0020] The first sealing member 30 is also known as a seal plug and is formed in a cylindrical shape that conforms to the shape of the through-hole 28. The top surface 31 of the first sealing member 30 is positioned in a recessed area from the bottom surface 27.

[0021] The first blocking member 30 is preferably made of a material with excellent thermal conductivity, such as copper. The first blocking member 30 is fixed to the penetration 28 by welding, for example. When the first blocking member 30 is fixed to the penetration 28 by welding, it is preferable that the first blocking member 30 is made of the same material as the stave 20. In Figure 2, the so-called build-up 32 formed during welding is provided on the periphery of the counterbore of the penetration 28.

[0022] The second closing member 40 is formed in a cylindrical shape that conforms to the shape of the through-hole 28. The second closing member 40 is preferably made of a material with excellent thermal conductivity, such as copper. The second closing member 40 is fixed to the through-hole 28 by welding, for example. When the second closing member 40 is fixed to the through-hole 28 by welding, it is preferable that the second closing member 40 is made of the same material as the stave 20. In Figure 2, a so-called build-up 41 formed during welding is provided on the periphery of the counterbore of the through-hole 28.

[0023] Preferably, the top surface 42 of the second closing member 40 is provided without protruding from the bottom surface 27. In other words, the top surface 42 of the second closing member 40 is provided in a position that is flat with the bottom surface 27 or in a position that is recessed from the bottom surface 27. By providing the second closing member 40 in this way, interference with adjacent staves 20 in the vertical direction can be suppressed.

[0024] The second closure member 40 preferably has a through hole 43 formed along the direction in which the through portion 28 is formed. The through hole 43 in the second closure member 40 allows the air between the first closure member 30 and the second closure member 40 to be discharged to the outside through the through hole 43, even if the air between them becomes warm. This suppresses deformation and damage caused by pressure changes in the space between the first closure member 30 and the second closure member 40.

[0025] Furthermore, it is preferable that a refractory material 50 is filled between the first closing member 30 and the second closing member 40. The refractory material 50 is not particularly limited, but it is preferable to use, for example, a plastic refractory material.

[0026] Plastic refractories can be easily deformed, like clay. Therefore, when plastic refractories are supplied to the penetration 28 after the first blocking member 30 has been installed, the plastic refractories deform to conform to the shape of the penetration 28. By allowing them to harden in this state, the refractories 50 can be provided in the penetration 28. In this way, plastic refractories have superior workability and can be easily deformed compared to solid refractories. As a result, it is possible to provide the refractories 50 in the penetration 28 without any gaps. By providing the refractories 50 in the penetration 28 without any gaps, the thermal impact on the first blocking member 30 can be reduced, and the lifespan of the stave 20 can be extended.

[0027] Because refractory material 50 is filled between the first sealing member 30 and the second sealing member 40, direct heating of the first sealing member 30 can be suppressed until the refractory material 50 is damaged and disappears. As a result, the deterioration of the first sealing member 30 can be delayed.

[0028] When manufacturing the stave 20 described above, first, (1) a water channel 21 is formed by drilling from the upper surface 26 or the lower surface 27. Next, (2) the first blocking member 30 is inserted into the penetration 28 and fixed by welding. Finally, (3) the second blocking member 40 is inserted into the penetration 28 and fixed by welding.

[0029] When partially replacing the staves 20, a step difference inevitably occurs between the surface of the replaced staves 20 and the existing staves 20 due to unavoidable construction reasons. When a step difference occurs between adjacent staves 20 arranged in the vertical direction, the components that block the waterway 21 will be exposed to the inside of the furnace.

[0030] Conventionally, the water channel 21 was blocked by only the first blocking member 30. Therefore, if the step difference becomes large, exposure of the first blocking member 30 to the inside of the furnace is unavoidable, and on the lower surface 27 side, the first blocking member 30 is directly exposed to hot air. Also, on the upper surface 26 side, the raw material collides with the first blocking member 30 and causes wear.

[0031] According to the furnace wall cooling device of the present invention, the penetration portion 28 that penetrates from the water channel 21 to the lower surface 27 is blocked by a first blocking member 30 and a second blocking member 40. That is, the top surface 31 of the first blocking member 30 is positioned in a recessed position from the lower surface 27. Here, the lower surface 27 of the staves 20 is susceptible to the effects of heat from the blast furnace 100. Therefore, by blocking the penetration portion 28 in this manner, the effects of heat on the first blocking member 30 can be reduced. Consequently, the rate of deterioration of the first blocking member 30 due to the effects of heat can be slowed down, and the occurrence of water leakage can be suppressed.

[0032] (Second Embodiment) In the first embodiment, an example was described in which the through-hole 28 is formed from the waterway 21 to the lower surface 27. The through-hole 28 may also be formed from the waterway 21 to the upper surface 26. Hereafter, components identical to those in the first embodiment will be denoted by the same reference numerals and their descriptions will be omitted.

[0033] Figure 3 shows a side cross-section of the stave 60. In the example shown in Figure 3, the waterway 21 has a through-hole 28 that penetrates the upper surface 26. The through-hole 28 is formed when the waterway 21 is formed from the upper surface 26. The through-hole 28 is closed by a first closing member 30 and a second closing member 70 which is provided to cover the first closing member 30.

[0034] The top surface 31 of the first closing member 30 is positioned in a recessed area from the upper surface 26. The first closing member 30 is fixed to the penetration 28, for example, by welding. In Figure 3, a so-called build-up 32 formed during welding is provided around the periphery of the counterbore of the penetration 28.

[0035] The second closing member 70 is formed, for example, in a cylindrical shape that conforms to the shape of the through-hole 28. The second closing member 70 is fixed to the through-hole 28, for example, by welding. In Figure 3, the so-called build-up 71 formed during welding is provided on the periphery of the counterbore of the through-hole 28.

[0036] The top surface 72 of the second blocking member 70 is preferably provided without protruding from the upper surface 26. In other words, the top surface 42 of the second blocking member 40 is preferably provided in a position that is flat with the upper surface 26 or in a position that is recessed from the upper surface 26. By providing the second blocking member 70 in this way, interference with adjacent staves 20 in the vertical direction can be suppressed.

[0037] Figure 4 is an explanatory diagram showing the configuration of the staves when raw materials are charged. As shown in Figure 4, when raw materials are charged into the blast furnace 100, the staves gradually wear down due to collisions with the raw materials, as indicated by the dashed line. Conventionally, since the first blocking member 30 is located at the same position as the second blocking member 70 in Figure 4, there was a risk of water leakage if wear progressed to that position.

[0038] In contrast, the top surface 31 of the first sealing member 30 of the present invention is positioned in a recessed area from the upper surface 26. This minimizes the impact of wear on the first sealing member 30, even if the stave 60 wears down, thereby suppressing water leakage.

[0039] In this embodiment, an example in which a second closing member 70 is provided has been described. The second closing member 70 is an optional member, and if the top surface 31 of the first closing member 30 is positioned in a recessed position from the upper surface 26, it is possible to obtain the effect of minimizing the effect of wear on the first closing member 30.

[0040] Furthermore, in the above-described embodiment, an example was given in which the second closing member 40 and the second closing member 60 are fixed to the penetration portion 28 by welding. The fixing of the second closing member to the penetration portion 28 is not limited to welding; for example, it may be fastened with bolts.

[0041] Figures 5 and 6 are explanatory diagrams showing other configuration examples of the second closing member 80. The second closing member 80 may be made of a so-called set screw having a helical groove 81 formed on its side. The second closing member 80 is provided with an insertion hole 82 formed at the top so as to be fitted with a tool.

[0042] For example, the second closing member 80 shown in Figure 5 is provided with an insertion hole 82 at its top, which is shaped like a regular hexagon when viewed from above. The second closing member 80 shown in Figure 6 is also provided with an insertion hole 82 at its top, which is shaped like a "-" (minus) sign when viewed from above. The shape of the insertion hole 82 is not particularly limited as long as a tool for tightening or loosening the set screw can be inserted, but it may be shaped like a "+" (plus) sign, for example. Furthermore, it is preferable that the second closing member 80 is provided with a through hole 83 that penetrates in the axial direction.

[0043] Even if the second sealing member 80 is configured as described above, the same effects and advantages as in the above-described embodiment can be obtained. That is, the rate of deterioration of the first sealing member 30 due to the effects of heat can be slowed down, and even if wear of the stave 60 progresses, the effect of wear on the first sealing member 30 can be minimized, thereby suppressing the occurrence of water leakage. [Explanation of Symbols]

[0044] 100 blast furnace 10 Ironhide 20 stab 21 Waterways 24 Surface 25 Back side 26 Top side 27 Bottom side 28 Penetration section 30 First closure member 31 Top surface 40 Second closure member 41 Top surface 60 staves

Claims

1. A furnace wall cooling device formed in a plate shape and having a water channel formed inside, The waterway has a through portion that penetrates either the upper surface or the lower surface formed between the upper and lower surfaces, A furnace wall cooling device in which the penetration is closed by a first closing member and a second closing member provided to cover the first closing member.

2. The furnace wall cooling device according to claim 1, wherein the second closing member has a through hole formed in the direction of the formation of the through portion.

3. The furnace wall cooling device according to claim 1, wherein a refractory material is filled between the first closing member and the second closing member.

4. The furnace wall cooling device according to claim 2, wherein a refractory material is filled between the first closing member and the second closing member.

5. A furnace wall cooling device formed in a plate shape and having a water channel formed inside, The waterway has a penetration portion that penetrates the upper surface formed between the surface and the back surface, The aforementioned penetration is closed by the first closing member. The top surface of the first blocking member is positioned in a recessed area from the upper surface, in a furnace wall cooling device.

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