JP2014227564A - Stave cooler and blast furnace with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stave cooler and a blast furnace each of which enables its life as a product to be prolonged.SOLUTION: In a body 102 of the stave cooler, made of a copper or a copper alloy rolled plate, a plurality of grooves 120 extending in the width direction of the body are formed keeping a space in the height direction of the body. Each of the grooves includes an opening 120a at a surface 102a and a bottom 120b located on the back face 102b side of the opening, and has a depth in the body thickness direction for connecting the surface and the back face. Between two adjacent grooves in the height direction of the body, there are formed ribs 122. Each of the ribs 122 has a surface of the body located between openings of the two grooves and a pair of sides 122b extending from the surface of the body to each bottom of the two grooves. The cross section of each rib 122 in the height direction of the body gradually increases as it proceeds from the bottom side toward the surface side of the body. A metallic protection plate member 130 which is in surface contact with the surface of the body and each of a pair of sides is engaged with and attached to the rib.

Description

  The present invention relates to a stave cooler for cooling a furnace wall and a blast furnace equipped with the stave cooler.

  Since the inside of the furnace body of the blast furnace becomes extremely hot, a large number of stave coolers for cooling and protecting the wall surface of the furnace body, that is, the furnace wall, are installed along the inner peripheral surface of the furnace body. In such a stave cooler, a cooling channel through which a cooling medium flows is formed in the main body, and the furnace wall is cooled by circulating the cooling medium through the cooling channel. In general, stave coolers are roughly classified into iron-based stave coolers composed of iron-based materials such as cast iron, cast steel, and steel plates, and copper-based stave coolers composed of copper or a copper alloy material.

  Conventionally, a stave cooler is generally made of cast iron in which a cooling channel is formed by a pipe cast into cast iron. However, in high pulverized coal injection operations that have become the mainstream in recent years, heat fluctuations in the furnace are repeated, so that the heat load in the furnace is large, and a cast iron stave cooler cannot ensure sufficient cooling performance. If the cooling performance of the stave cooler is insufficient, the surface inside the furnace wall of the furnace wall will become high temperature, the material deterioration and wear of the stave cooler will progress, or the warpage will occur due to thermal stress, which will interfere with the in-furnace profile. . Furthermore, there is a problem in that the stave cooler itself is cracked and damaged, so that the frequency of replacement of the stave cooler increases and the furnace life is shortened.

  Therefore, in recent years, as shown in Patent Document 1, for example, a copper-based stave cooler has been widely adopted. Copper-based stave coolers are superior to iron-based stave coolers in terms of physical properties such as thermal conductivity and ductility, so they have a uniform temperature distribution at low temperatures, can suppress generated thermal stress, and reduce deformation. Can reduce the damage taken. However, on the other hand, the copper-based stave cooler has a weak point that it has lower wear resistance than the iron-based stave cooler.

  In a blast furnace, fillings in the furnace, such as iron ore and coke, are introduced and lowered from the top of the furnace body, but depending on the installation location of the stave cooler, such as the furnace belly, it is still hard as a filling in the furnace. Sintered ore comes into contact with the surface of the main body of the stave cooler facing the center of the furnace body. In this way, when the surface of the main body of the stave cooler is worn out due to contact wear of the furnace filling, the main body of the stave cooler is gradually scraped from the surface side, and finally the cooling flow path formed inside the main body Is destroyed.

  Therefore, in the stave cooler shown in Patent Document 2, the wear resistance is improved by welding a hardfacing layer to the surface of the main body made of copper or copper alloy, and the life of the stave cooler is extended. .

Japanese Examined Patent Publication No. 63-56283 JP 2001-192715 A

  However, since copper has high thermal conductivity, the arc heat during welding escapes to the entire base metal, making it difficult to locally heat the welded part, resulting in insufficient penetration, There is a possibility that the molten metal becomes spherical and a bead cannot be formed. Therefore, in the stave cooler shown in the above-mentioned Patent Document 2, due to the difference in thermal expansion from the copper base material, cracks are likely to occur during welding of the hardfacing layer, and the hardfacing layer Drop off and disappear at an early stage, resulting in a short life of the stave cooler. In addition, as described above, the welding work for forming the hardfacing layer has many problems in construction, and because of the welding work by human sea tactics, there is a problem that the manufacturing cost of the stave cooler increases significantly. there were.

  The objective of this invention is providing the stave cooler and blast furnace which can prolong the lifetime of a product, while being low-cost.

  In order to solve the above problems, the stave cooler of the present invention is an installation state in which a cooling channel through which a cooling medium flows is formed inside a body made of a rolled plate of copper or copper alloy, and is installed on the furnace wall of a blast furnace The main body has a surface cooler facing the center side of the furnace surrounded by the furnace wall, and the back surface of the main body faces the inner peripheral surface of the furnace wall. A plurality of grooves extending in the main body width direction connecting both end portions of the main body located in the circumferential direction are formed at intervals in the main body height direction orthogonal to the main body width direction, and adjacent to each other in the main body height direction. Between the two grooves, there is a surface of the main body located between the openings of the two grooves, and a pair of sides extending from the surface of the main body toward the bottoms of the two grooves, The cross-sectional area in the height direction goes from the bottom side to the surface side of the main body Therefore rib gradually increases is formed, the rib, metal safety plate material in surface contact with the respective surfaces and a pair of side portions of the body that constitutes the rib, characterized in that it is fitted and attached.

  Further, the protective plate material may be in surface contact with a part of the bottom of the groove adjacent to the fitted and mounted rib.

  In order to solve the above problems, the stave cooler of the present invention is an installation state in which a cooling channel through which a cooling medium flows is formed inside a body made of a rolled plate of copper or copper alloy, and is installed on the furnace wall of a blast furnace The main body has a surface cooler facing the center side of the furnace surrounded by the furnace wall, and the back surface of the main body faces the inner peripheral surface of the furnace wall. A plurality of grooves extending in the main body width direction connecting both end portions of the main body located in the circumferential direction are formed at intervals in the main body height direction orthogonal to the main body width direction, and adjacent to each other in the main body height direction. Between the two grooves, there is a surface of the main body located between the openings of the two grooves, and a pair of sides extending from the surface of the main body toward the bottoms of the two grooves, The cross-sectional area in the height direction goes from the bottom side to the surface side of the main body Therefore rib gradually increases is formed, the groove bottom of the groove, and characterized in that the metallic protective plate material in surface contact with the respective sides of the rib adjacent to the groove is fitted and attached.

  Further, the pair of side portions may be formed in a taper shape in which the distance from the center of the rib in the main body height direction increases from the bottom side of the groove toward the front surface side of the main body.

  Moreover, the protective plate material is good to laminate | stack two or more steel plates in the plate | board thickness direction.

  In the installed state of the main body, the steel plate located closest to the furnace has higher wear resistance than the steel plate located closest to the furnace wall, and the steel plate located closest to the furnace wall is located closest to the furnace. It is better that the heat conductivity is higher than that of the steel sheet.

  Moreover, the protection board material is divided | segmented into plurality in the main body width direction, and the division | segmentation position is good to have shifted | deviated to the main body width direction between the two protection board materials adjacent in a main body height direction.

  In order to solve the above problems, the blast furnace according to the present invention includes a main body made of a rolled plate of copper or a copper alloy, in a state where a cooling channel through which a cooling medium flows is formed and installed on the furnace wall. The blast furnace is provided with a stave cooler with the surface facing the center side of the furnace surrounded by the furnace wall and the back of the main body facing the inner peripheral surface of the furnace wall. A plurality of grooves extending in the main body width direction connecting both side ends of the main body located in the circumferential direction of the main body are formed at intervals in the main body height direction orthogonal to the main body width direction, and are adjacent to each other in the main body height direction. Between the two grooves, there is a surface of the main body located between the openings of the two grooves, and a pair of sides extending from the surface of the main body toward the bottoms of the two grooves, The cross-sectional area in the main body height direction is from the bottom side to the front surface side of the main body. Rib gradually increases is formed I, the rib, metal safety plate material in surface contact with the respective surfaces and a pair of side portions of the body that constitutes the rib, characterized in that it is fitted and attached.

  In order to solve the above problems, the blast furnace according to the present invention includes a main body made of a rolled plate of copper or a copper alloy, in a state where a cooling channel through which a cooling medium flows is formed and installed on the furnace wall. The blast furnace is provided with a stave cooler with the surface facing the center side of the furnace surrounded by the furnace wall and the back of the main body facing the inner peripheral surface of the furnace wall. A plurality of grooves extending in the main body width direction connecting both side ends of the main body located in the circumferential direction of the main body are formed at intervals in the main body height direction orthogonal to the main body width direction, and are adjacent to each other in the main body height direction. Between the two grooves, there is a surface of the main body located between the openings of the two grooves, and a pair of sides extending from the surface of the main body toward the bottoms of the two grooves, The cross-sectional area in the main body height direction is from the bottom side to the front surface side of the main body. Rib gradually increases is formed me, the groove, the bottom of the groove, and characterized in that the metallic protective plate material in surface contact with the respective sides of the rib adjacent to the groove is fitted and attached.

  According to the present invention, although the cost is low, the life of the blast furnace can be extended by extending the life by preventing the wear of the stave cooler.

It is a conceptual diagram for demonstrating a blast furnace. It is a schematic sectional drawing which shows the installation state of a stave cooler. It is the III-III sectional view taken on the line of FIG. (A) is the front view seen from the furnace inside of a stave cooler, (b) is IV (b) -IV (b) sectional view taken on the line of (a). It is the elements on larger scale of FIG.4 (b). It is a perspective view of the protection board material of 1st Embodiment. It is a figure explaining the modification of a cap-shaped protection board material. It is a figure explaining the protection board material of (omega) (omega) shape of 2nd Embodiment. It is a figure explaining the U-shaped protection board material of 3rd Embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is a conceptual diagram for explaining a blast furnace 1. A blast furnace 1 shown in FIG. 1 melts iron ore, which is a metal raw material, to produce pig iron. Iron ore, a reducing agent serving as a fuel such as coke, limestone that removes impurities (hereinafter referred to as iron ore, A raw material tank 2 for storing a mixture of a reducing agent, limestone and the like is simply referred to as “fill in the furnace”). The filling in the furnace stored in the raw material tank 2 is conveyed to the furnace top of the furnace body 6 by the charging conveyor 4 and charged from the top of the furnace into a hopper 8 provided on the top of the furnace body 6.

  Below the hopper 8, there is provided a distribution chute 10 that allows the furnace charge falling from the hopper 8 to drop downward while sliding on the inclined surface. The distribution chute 10 is arranged so that one end is located directly below the central portion of the hopper 8, and rotates in the direction of the arrow indicated by the broken line in the drawing with the one end side as the central axis. As a result, the in-furnace filling dropped from the hopper 8 falls while sliding on the inclined surface of the distribution chute 10 and is distributed and charged throughout the entire periphery of the furnace body 6.

  A tuyere 12 is provided below the furnace body 6, and hot air is introduced into the furnace body 6 from the tuyere 12. The hot air introduced into the furnace body 6 ascends the furnace body 6, but when coke in the in-furnace filling falling from the distribution chute 10 is burned by the hot air, carbon monoxide (reducing agent) is generated, and carbon of the coke is produced. Along with a reduction reaction in which the components deprive oxygen from iron, carbon dioxide and heat are generated, and this reaction serves as a heat source to melt the iron ore. In the process of dropping the filling in the furnace, such a reaction is continuously performed, and the combustion temperature becomes the highest when reaching the lower part of the furnace body 6, and high-temperature liquid pig iron is obtained at the bottom of the furnace body 6. A gas conduit 14 is connected to the furnace top of the furnace body 6, and high-temperature blast furnace gas is discharged from the furnace body 6 to the gas conduit 14.

  Further, since the inside of the furnace body 6 becomes extremely hot, a stave cooler 100 that cools and protects the furnace wall 6 a called a “iron skin” is installed inside the furnace body 6. Many stave coolers 100 are installed along the inner peripheral surface of the furnace wall 6a. Below, the structure of the stave cooler 100 is explained in full detail using FIGS.

  FIG. 2 is a schematic cross-sectional view showing the installation state of the stave cooler 100, and FIG. 3 is a cross-sectional view taken along the line III-III in FIG. As shown in FIGS. 2 and 3, the stave cooler 100 of the first embodiment is a main body 102 made of a rolled sheet of copper or copper alloy that is arranged with a gap maintained on the inner peripheral surface of the furnace wall 6 a of the blast furnace 1. It has.

  Hereinafter, in the installed state in which the main body 102 is disposed on the inner peripheral surface of the furnace wall 6a, the surface facing the center side of the space surrounded by the furnace wall 6a is referred to as the surface 102a, and the gap is maintained in the furnace wall 6a. In other words, the surface facing the furnace wall 6a is the back surface 102b. Moreover, as shown in FIG. 3, in the installation state of the stave cooler 100, both side ends of the main body 102 located in the circumferential direction of the furnace wall 6a are side surfaces 102c. The direction connecting both side surfaces 102c is the width direction of the main body 102 (x direction in the figure), and in the installed state of the stave cooler 100, the upper surface located on the furnace top side of the furnace body 6 and the lower side of the furnace body 6 The direction connecting the lower surface is defined as the height direction (y direction in the drawing) of the main body 102, and the direction connecting the front surface 102a and the back surface 102b is described as the thickness direction (z direction in the drawing) of the main body 102.

  As shown in FIG. 2, a bolt 106 is fixed to the back surface 102b of the main body 102 via a bolt spacer 104, and the stave cooler 100 is installed in the furnace wall 6a by the bolt 106.

  As is clear from FIGS. 2 and 3, a plurality (four in this embodiment) of cooling channels 108 through which the cooling medium flows are formed inside the main body 102. Each cooling flow path 108 extends linearly in the height direction (y direction) of the main body 102 from the upper surface side to the lower surface side of the main body 102, and each cooling flow path 108 extends in the width direction ( (x direction) are arranged in parallel at a predetermined interval. A water supply pipe 110 is connected to the lower end side of each cooling channel 108, and a drain pipe 112 is connected to the upper end side of each cooling channel 108. At this time, a pipe portion spacer 114 is provided between the back surface 102b of the main body 102 and the furnace wall 6a, which is a connection portion between the main body 102, the water supply pipe 110, and the drain pipe 112. A compensator 116 having a gas sealing function is provided outside the furnace wall 6a so that no stress is applied to the water supply pipe 110 and the drain pipe 112 when the main body 102 is thermally deformed.

  With the above configuration, when the cooling medium is supplied from the water supply pipe 110 to the cooling flow path 108, the cooling medium flows from the lower side to the upper side in the height direction (y direction) of the furnace wall 6 a inside the main body 102. The cooling medium is discharged from the drain pipe 112 to the outside of the furnace body 6. Thereby, the furnace wall 6a of the furnace body 6 is cooled in the process in which the cooling medium circulates inside the main body 102.

  4A is a front view of the stave cooler 100 viewed from the inside of the furnace, and FIG. 4B is a cross-sectional view taken along line IV (b) -IV (b) in FIG. 5 is a partially enlarged view of FIG. As shown in FIGS. 4B and 5, the surface 102 a of the main body 102 has a depth in the thickness direction (z direction) of the main body 102 and extends in the width direction (x direction) of the main body 102. A groove 120 is formed. The groove 120 has an opening 120a that opens to the surface 102a of the main body 102, and a bottom 120b that is positioned closer to the back surface 102b of the main body 102 than the opening 120a. (Direction), and a plurality of gaps are formed.

  Thereby, a rib 122 extending in the width direction (x direction) of the main body 102 is formed between two grooves 120 adjacent to each other in the height direction (y direction) of the main body 102. The rib 122 includes a surface 122a (surface 102a of the main body 102) positioned between the openings 120a of two grooves 120 adjacent to each other in the height direction (y direction) of the main body 102, and two grooves from the surface 122a. 120 has a pair of side portions 122b extending toward each of the bottom portions 120b.

  Of the pair of side portions 122b constituting the rib 122, one side portion 122b located on the upper end side of the main body 102 is inclined toward the upper end side from the bottom portion 120b toward the surface 122a and is located on the lower end side of the main body 102. The other side portion 122b is inclined in a tapered manner toward the lower end side from the bottom portion 120b toward the surface 122a. That is, the distance L from the center in the height direction of the main body 102 in the rib 122 increases as the pair of side parts 122b moves from the bottom 120b side of the groove 120 toward the surface 122a (surface 102a of the main body 102). ing. In other words, the rib 122 has a taper shape with a wide tip that gradually increases in cross-sectional area in the height direction of the main body 102 from the bottom 120b side toward the surface 122a side. Therefore, the groove 120 has a so-called “groove shape” in which the groove width in the height direction (y direction) of the main body 102 gradually narrows from the bottom 120b side toward the opening 120a side.

  Here, with respect to the pair of side portions 122b, the distance L from the center in the height direction of the main body 102 in the rib 122 increases from the bottom 120b side of the groove 120 toward the front surface 122a (the front surface 102a of the main body 102). It was decided to grow. However, for example, the pair of side portions 122 b may stand up perpendicularly to the bottom portion 120 b of the groove 120. Further, for example, one side 122b may be formed in a tapered shape that stands upright with respect to the bottom 120b of the groove 120 and the other side 122b has a wide tip.

  FIG. 6 is a perspective view of the protective plate member 130. The rib 122 is fitted with and fitted with a metal protective plate 130 for protecting the main body 102 from contact with the furnace filling. In this embodiment, as shown in FIG. 5 and FIG. 6, a protective plate 130 is obtained by welding a plurality of clad steel plates (crimped steel), which are steel materials bonded with two different types of properties, according to the outer shape of the ribs 122. Is molded. When the protective plate member 130 is fitted to and attached to the rib 122, the protective plate member 130 may be fitted into the end of the rib 122 in the width direction and slid in the width direction. In the joined state, the protective plate 130 is in surface contact with the surface 122a of the rib 122 (the surface 102a of the main body 102) and the pair of side portions 122b.

  The protective plate member 130 is formed by stacking two steel plates in the thickness direction. Here, in the installed state where the main body 102 is installed in the blast furnace 1, the steel plate located inside the furnace, that is, outside the protective plate member 130. The steel plate located in the steel plate is referred to as a wear-resistant steel plate 130a, and the steel plate located on the furnace wall 6a side, that is, the inside of the protective plate member 130 is described as a base steel plate 130b. There are no particular limitations on the materials and dimensions of the wear-resistant steel plate 130a and the base steel plate 130b, but examples of the wear-resistant steel plate 130a include a high manganese chromium austenitic steel, a high carbon high chromium alloy (2 7% C, 27% Cr), martensitic 13% chromium steel, etc. may be used. Further, as the base material steel plate 130b, for example, mild steel, stainless steel, or other easily welded steel having a thickness of about 6 to 9 mm may be used. Particularly, when the temperature condition to be used is about 800 ° C. For example, SUS316 and SUS316L are desirable, and SUS310 and SUS310S are desirable when the temperature condition to be used is about 1000 ° C.

  That is, the wear-resistant steel plate 130a with which the furnace filling comes into contact should have higher wear resistance than the base steel plate 130b, and the base steel plate 130b relatively close to the cooling channel 108 It is good that it has higher heat conductivity than the worn steel plate 130a. As described above, by using the base steel plate 130b having higher heat conductivity than the wear-resistant steel plate 130a, the heat of the protective plate 130 exposed to the high temperature environment inside the furnace is cooled by the cooling medium flowing through the cooling channel 108. The released main body 102 can be quickly released. Further, by using the high heat conductive base material steel plate 130b, the temperature change in the thickness direction of the main body 102 can be inclined, the local temperature change is suppressed, and the main body 102 and the protection plate material 130 are deformed. And wear can be suppressed. Furthermore, if the base steel plate 130b is made of a material superior in impact resistance (buffer performance) to the wear resistant steel plate 130a such as mild steel, the base steel plate is used as a buffer material that absorbs the impact received by the wear resistant steel plate 130a. 130b functions, and damage to the main body 102 can be reduced.

  As described above, according to the stave cooler 100 of the present embodiment, by fitting and attaching the protective plate 130 to the rib 122, the wear resistance, which is a weak point of the copper-based stave cooler, is improved, and the main body 102 is worn out. As a result, the life of the stave cooler 100 can be extended. Moreover, the protective plate 130 uses a steel plate that can be easily obtained, can be easily cut and welded, and can be fitted and mounted simply by sliding on the rib 122 formed in a tapered shape. Therefore, an increase in material cost and manufacturing cost can be suppressed.

  In the present embodiment, the case where a clad steel plate is used as the protective plate material 130 has been described. However, the protective plate material 130 is not limited to the clad steel plate, and may be composed of a single metal plate material. Three or more steel plates may be laminated in the direction. When the protective plate 130 is configured by laminating two or more steel plates, the steel plate located closest to the furnace inside in the installed state of the main body 102 is more wear resistant than the steel plate located closest to the furnace wall 6a. It is good to use a high thing, and it is good to use a thing with higher heat conductivity than the steel plate located in the furnace innermost as a steel plate located in the furnace wall 6a side most.

  7A and 7B are diagrams for explaining the protective plate materials 140 and 150 according to the cap-shaped modification. FIG. 7A is a perspective view of the protective plate material 140, and FIG. It is the front view seen from the furnace inner side of the main body 102 made. The protection plate material 140 of the modified example shown in FIG. 7A is obtained by dividing the protection plate material 130 of the first embodiment into a plurality (here, three of 140a, 140b, 140c) in the width direction of the main body 102. It is. The protection plate members 140a and 140c have the same length in the width direction of the main body 102, and the protection plate material 140b has a longer length in the width direction of the main body 102 than the protection plate materials 140a and 140c.

  Further, as shown in FIG. 7B, in this modified example, a plurality of protective plate members 130 of the first embodiment are arranged in the width direction of the main body 102 (here, 150a, The protective plate material 150 is divided into three parts 150b and 150c. The protective plate members 150a and 150c are equal in length in the width direction of the main body 102, are longer than the protective plate members 140a and 140c, and shorter than the protective plate member 140b. The protective plate member 150b is a protective member. The dimensional relationship is longer than that of the plate materials 150a and 150c.

  As described above, the protection plate material 140 and the protection plate material 150 divided into a plurality in the width direction of the main body 102 are attached to the ribs 122 while maintaining a gap of about 3 to 5 mm in the width direction of the main body 102, for example. Thereby, even if the protective plate 140 and the protective plate 150 are deformed by thermal expansion, the deformation can be absorbed by the gap.

  Further, as shown in FIG. 7B, protective plate members 140 and 150 are alternately fitted and attached to the rib 122 in the height direction of the main body 102. Therefore, the dividing position of the protective plate member 140, that is, the dividing position 140x of the protective plate member 140a and the protective plate member 140b, the dividing position 140x of the protective plate member 140b and the protective plate member 140c, and the dividing position of the protective plate member 150, that is, protection. The division position 150x between the plate material 150a and the protection plate material 150b and the division position 150x between the protection plate material 150b and the protection plate material 150c are shifted in the width direction of the main body 102.

  That is, between the two protective plate members 140 and 150 adjacent to each other in the height direction of the main body 102, the divided position 140x of the protective plate member 140 and the divided position 150x of the protective plate member 150 are shifted in the width direction of the main body 102. If the dividing positions 140x and 150x are positioned in a straight line in the height direction of the main body 102, the furnace filling that has entered the gap between the dividing positions 140x and 150x causes the main body 102 to be in a straight line, that is, There is a risk of selective wear locally. As in this modification, local wear of the main body 102 can be avoided by positioning the dividing position 140x of the protective plate 140 and the dividing position 150x of the protective plate 150 in a so-called “staggered” manner. It becomes.

  FIG. 8 is a diagram for explaining the Ω (omega) -shaped protective plate material 160 of the second embodiment. FIG. 8A is a cross-sectional view showing a mounting state of the protective plate material 160, and FIG. It is a perspective view of the protection board material 160. FIG. The protection plate material 160 of the second embodiment shown in FIG. 8 has a configuration in which a bottom surface portion 160c that comes into surface contact with the bottom portion 120b of the groove 120 is added to the protection plate material 130 of the first embodiment. Specifically, the protective plate 160 includes a front surface portion 160a that is in surface contact with the surface 122a of the rib 122, a side surface portion 160b that is continuous with the front surface portion 160a and is in surface contact with the side portion 122b of the rib 122, and the side surface portion. It is formed in a substantially Ω-shaped cross section including a bottom surface portion 160c that is continuous to 160b and that is in surface contact with a part of the bottom portion 120b of the groove 120. As described above, by providing the bottom surface portion 160c that is in surface contact with a part of the bottom portion 120b of the groove 120 adjacent to the rib 122, the contact area with the main body 102 is increased, and the holding power and the cooling capacity of the protection plate 160 are increased. And thus the durability can be further improved.

  FIGS. 9A and 9B are diagrams illustrating a U-shaped protection plate material 170 according to the third embodiment. FIG. 9A is a cross-sectional view showing a mounting state of the protection plate material 170, and FIG. 9B is a protection plate material. FIG. The protection plate material 170 of the third embodiment shown in FIG. 9 has a shape different from that of the protection plate material 130 of the first embodiment, and is fitted and mounted in the groove 120. That is, the protective plate member 130 of the first embodiment covers the ribs 122 of the main body 102, whereas the protective plate member 170 of the third embodiment covers the grooves 120 of the main body 102.

  Specifically, the protection plate material 170 includes a bottom surface portion 170 a that is in surface contact with the bottom portion 120 b of the groove 120, and a side surface portion 170 b that is continuous with the bottom surface portion 170 a and is in surface contact with the side portion 122 b of the rib 122 adjacent to the groove 120. And having a substantially U-shaped cross section. As described above, according to the protective plate 170 fitted and attached to the inner peripheral surface of the groove 120 in a surface contact state, it is thermally expanded due to the influence of heat in the furnace, so that the inner surface of the groove 120 is expanded. Since it becomes a shrink-fitted state, the holding power is increased, so that the durability at a high temperature in the furnace can be improved.

  The protection plate material 160 of the second embodiment and the protection plate material 170 of the third embodiment may be divided into a plurality of parts in the width direction of the main body 102 as in the modification of the first embodiment. Can be arranged so that the division position is shifted in the height direction of the main body 102. Also in this case, the same effect as that of the above modification can be realized.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Is done.

  INDUSTRIAL APPLICABILITY The present invention can be used for a stave cooler that cools a furnace wall and a blast furnace equipped with the stave cooler.

DESCRIPTION OF SYMBOLS 1 Blast furnace 100 Stave cooler 102 Main body 102a Surface 102b Back surface 102c Side surface 108 Cooling flow path 120 Groove 120a Opening part 120b Bottom part 122 Rib 122a Surface 122b Side part 130, 140, 150, 160 Protection board material 140x, 150x Dividing position

Claims (9)

A cooling channel through which a cooling medium flows is formed inside a main body made of a rolled plate of copper or copper alloy, and the surface of the main body is surrounded by the furnace wall in the installed state installed on the furnace wall of the blast furnace. A stave cooler facing the center side in the furnace, the back of the main body facing the inner peripheral surface of the furnace wall,
In the main body,
A plurality of grooves extending in the main body width direction connecting both side ends of the main body located in the circumferential direction of the furnace wall in the installed state are maintained at intervals in the main body height direction perpendicular to the main body width direction. And
Between two grooves adjacent to each other in the body height direction, the surface of the body located between the two grooves and the bottom surface of the two grooves extend from the surface of the body. A rib having a pair of side portions and having a cross-sectional area in the main body height direction that gradually increases from the bottom side toward the surface side of the main body is formed,
A stave cooler, wherein the rib is fitted with a metal protective plate that is in surface contact with the surface of the main body and the pair of side portions constituting the rib.   2. The stave cooler according to claim 1, wherein the protective plate material also makes surface contact with a part of a bottom portion of a groove adjacent to the fitted and mounted rib. A cooling channel through which a cooling medium flows is formed inside a main body made of a rolled plate of copper or copper alloy, and the surface of the main body is surrounded by the furnace wall in the installed state installed on the furnace wall of the blast furnace. A stave cooler facing the center side in the furnace, the back of the main body facing the inner peripheral surface of the furnace wall,
In the main body,
A plurality of grooves extending in the main body width direction connecting both side ends of the main body located in the circumferential direction of the furnace wall in the installed state are maintained at intervals in the main body height direction perpendicular to the main body width direction. And
Between two grooves adjacent to each other in the body height direction, the surface of the body located between the two grooves and the bottom surface of the two grooves extend from the surface of the body. A rib having a pair of side portions and having a cross-sectional area in the main body height direction that gradually increases from the bottom side toward the surface side of the main body is formed,
A stave cooler, wherein the groove is fitted with and fitted with a metal protective plate that is in surface contact with the bottom of the groove and the side of the rib adjacent to the groove.   The pair of side portions are each formed in a tapered shape in which the distance from the center in the height direction of the main body of the rib increases from the bottom side of the groove toward the surface side of the main body. The stave cooler according to any one of claims 1 to 3.   The stave cooler according to any one of claims 1 to 4, wherein the protective plate is formed by laminating two or more steel plates in the thickness direction.   In the installed state of the main body, the steel plate positioned closest to the furnace inner side has higher wear resistance than the steel plate positioned closest to the furnace wall, and the steel plate positioned closest to the furnace wall is the innermost side of the furnace. The stave cooler according to claim 5, wherein heat conductivity is higher than that of the steel plate located in the wall.   The said protection board material is divided | segmented into plurality in the said main body width direction, The said division | segmentation position has shifted | deviated to this main body width direction between the two protection board materials adjacent to the said main body height direction. The stave cooler of any one of claim | item 1 -6. A cooling channel through which a cooling medium flows is formed inside a main body made of a rolled plate of copper or copper alloy, and in the installation state installed on the furnace wall, the surface of the main body is surrounded by the furnace wall. A blast furnace equipped with a stave cooler facing the inner peripheral surface of the furnace wall,
In the main body,
A plurality of grooves extending in the main body width direction connecting both side ends of the main body located in the circumferential direction of the furnace wall in the installed state are maintained at intervals in the main body height direction perpendicular to the main body width direction. And
Between two grooves adjacent to each other in the body height direction, the surface of the body located between the two grooves and the bottom surface of the two grooves extend from the surface of the body. A rib having a pair of side portions and having a cross-sectional area in the main body height direction that gradually increases from the bottom side toward the surface side of the main body is formed,
A blast furnace provided with a stave cooler, wherein the rib is fitted with a metal protective plate material in surface contact with the surface of the main body and the pair of side portions constituting the rib. A cooling channel through which a cooling medium flows is formed inside a main body made of a rolled plate of copper or copper alloy, and in the installation state installed on the furnace wall, the surface of the main body is surrounded by the furnace wall. A blast furnace equipped with a stave cooler facing the inner peripheral surface of the furnace wall,
In the main body,
A plurality of grooves extending in the main body width direction connecting both side ends of the main body located in the circumferential direction of the furnace wall in the installed state are maintained at intervals in the main body height direction perpendicular to the main body width direction. And
Between two grooves adjacent to each other in the body height direction, the surface of the body located between the two grooves and the bottom surface of the two grooves extend from the surface of the body. A rib having a pair of side portions and having a cross-sectional area in the main body height direction that gradually increases from the bottom side toward the surface side of the main body is formed,
A blast furnace provided with a stave cooler, wherein a metal protective plate material in surface contact with each of a bottom portion of the groove and a side portion of the rib adjacent to the groove is fitted into the groove.

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