A cooling wall structure

Abstract

The present invention proposes a cooling wall structure, in the field of iron and steel metallurgy technology, the cooling wall structure is arranged on the inner wall surface of the blast furnace shell, wherein the cooling wall structure comprises a first cooling wall and a second cooling wall with different thermal conductivity coefficients, the first cooling wall is located above the second cooling wall, and the bottom edge of the hot surface of the first cooling wall and the top edge of the hot surface of the second cooling wall have an indentation interval in the horizontal direction. The cooling wall structure proposed by the present invention can realize the actual operation of the cooling wall after the slag skin is formed. The inner shape is smooth, which is beneficial to the production of the blast furnace. At the same time, it can also effectively protect the entire cooling equipment, which is beneficial to prolonging the service life of the blast furnace.

Description

Technical Field

[0001] The invention relates to the technical field of iron and steel metallurgy, and in particular to a cooling wall structure. Background Art

[0002] During the blast furnace smelting process, complex physical and chemical reactions are carried out in the furnace belly, furnace waist and the lower part of the furnace body. The working conditions are harsh and the heat flux intensity is very high. The copper cooling stave with rolled copper plate as the main body has a large cooling intensity. Therefore, it has been widely used in the furnace belly, furnace waist and lower part of the furnace body of large and medium-sized blast furnaces. However, through the use in recent years, it has been found that the copper cooling stave has not achieved the expected effect. The copper cooling stave has been damaged in some blast furnaces after a few years of production. The high investment has not brought long-term benefits, and it has brought unsafe risks to blast furnace production while also increasing production costs.

[0003] Through the investigation of the damage of some blast furnace copper cooling staves, it was found that the upper edge of the copper cooling stave body at the bottom of the furnace body was worn and leaked due to the furnace structure in which the hot surface of the copper cooling stave was aligned with the hot surface of the cast iron or cast steel cooling stave above. After analysis, it was found that due to the poor thermal conductivity of the cast iron or cast steel cooling stave above, the hot surface of the cooling stave was not easy to form slag skin. Therefore, the hot surface of the cooling stave was easily worn by the erosion of high-temperature coal gas, furnace charge, etc., which would expose the upper edge of the copper cooling stave body below to the furnace, and the descending furnace charge would frequently rub against it, while the copper material was relatively soft, which eventually led to the wear and leakage of the upper edge of the copper cooling stave. In addition, during the production process, due to the different thermal conductivity of the copper cooling stave and the cast iron or cast steel cooling stave, the cooling intensity was also very different. Therefore, the thickness of the slag skin formed on the hot surface of the cooling stave was also different, which would cause the actual operation of the inner profile to be not smooth, and the rise of coal gas and the fall of furnace charge would be affected to a certain extent, so that the fuel consumption of the blast furnace could not reach the best.

[0004] The blast furnace shell is a cylindrical structure. The cast iron or cast steel cooling staves made by casting technology can be cast into a curved surface structure as required. The staggered installation of the upper and lower cooling staves can maintain a smooth inner shape. The copper cooling stave body currently used is a rolled copper plate. The cooling channel is made on the copper plate through a drilling process, and then the external welded water pipe is connected to the channel. The rolling process of the copper cooling stave determines that it can only be a flat plate structure. After a section of the copper cooling stave is installed, it is actually a polygon that is approximately circular. Usually, in order to avoid the formation of vertical through seams between the upper and lower cooling staves, the layout of staggered half-block cooling staves is adopted, and the triangular seams formed during installation are not considered. Therefore, once the slag skin falls off during the production process, the descending furnace charge and the rising high-temperature coal gas flow will cause scouring damage to the body. In the investigation of copper cooling stave damage, the proportion of damage caused by scouring is relatively large.

[0005] Therefore, it is urgent to adopt a reasonable copper cooling wall structure system to extend the service life of the copper cooling wall and thus achieve the longevity of the furnace body. Summary of the invention

[0006] The object of the present invention is to provide a cooling wall structure, which can realize the smooth inner shape of the cooling wall after the slag skin is formed, which is beneficial to the production of the blast furnace. At the same time, it can also effectively protect the entire cooling equipment, which is beneficial to prolonging the service life of the blast furnace.

[0007] To achieve the above-mentioned object, the present invention proposes a cooling wall structure, which is arranged on the inner wall surface of a blast furnace shell, wherein the cooling wall structure comprises a first cooling wall and a second cooling wall with different thermal conductivities, the first cooling wall is located above the second cooling wall, and the bottom edge of the hot surface of the first cooling wall and the top edge of the hot surface of the second cooling wall have an indentation interval in the horizontal direction.

[0008] In the cooling stave structure as described above, the hot surface of the first cooling stave is covered with first inlay bricks, and the hot surface of the second cooling stave is covered with second inlay bricks, and the bottom edge of the hot surface of the first inlay brick is flush with the top edge of the hot surface of the second inlay brick.

[0009] In the cooling wall structure as described above, the thermal conductivity of the first cooling wall is smaller than that of the second cooling wall, and the bottom edge of the hot surface of the first cooling wall protrudes inwardly beyond the top edge of the hot surface of the second cooling wall.

[0010] The cooling wall structure as described above, wherein the second cooling wall comprises a plurality of second cooling sections arranged in sequence from top to bottom, each of the second cooling sections is formed by a plurality of second cooling wall bodies arranged in sequence along the circumference of the blast furnace shell, and a vertically arranged second expansion joint is provided between two adjacent second cooling wall bodies.

[0011] In the cooling wall structure as described above, two upper and lower adjacent second expansion joints are aligned.

[0012] In the cooling wall structure as described above, two upper and lower adjacent second expansion joints are staggered, and the staggered distance between the two expansion joints is smaller than the width of the second expansion joint.

[0013] The cooling wall structure as described above, wherein the second cooling wall body is in the shape of a flat plate.

[0014] The cooling stave structure as described above, wherein the first cooling stave is a cast iron cooling stave or a cast steel cooling stave.

[0015] The cooling wall structure as described above, wherein the second cooling wall is a copper cooling wall.

[0016] In the cooling wall structure as described above, the second cooling wall is a composite cooling wall, and the hot surface of the composite cooling wall is made of copper material.

[0017] Compared with the prior art, the present invention has the following characteristics and advantages:

[0018] The cooling wall structure proposed in the present invention can make the slag skin at the bottom edge of the first cooling wall and the slag skin at the top edge of the second cooling wall have different thicknesses but still have a smooth transition, by pre-setting an indentation interval between the bottom edge of the hot surface of the first cooling wall and the top edge of the hot surface of the second cooling wall. That is, the entire cooling wall structure can be made smooth in actual operation after the slag skin is formed, thereby achieving an effect that is beneficial to blast furnace production and further improving blast furnace operating indicators; at the same time, it can also effectively protect the entire cooling equipment, which is beneficial to extending the service life of the blast furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the figures are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the teachings of the present invention.

[0020] Figure 1 A schematic diagram of the cooling wall structure proposed by the present invention;

[0021] Figure 2 for Figure 1 A partial enlarged view of point I in the middle;

[0022] Figure 3 A comparison diagram of the cooling wall structure proposed by the present invention and the prior art;

[0023] Figure 4 for Figure 3 A partial enlarged view of the middle part III;

[0024] Figure 5 for Figure 3 A partial enlarged view of the middle IV;

[0025] Figure 6 The layout diagram of the cooling wall structure proposed by the present invention;

[0026] Figure 7 for Figure 6 A partial enlarged view of point II in the middle.

[0027] Description of reference numerals:

[0028] 100. Cooling wall structure; 10. First cooling wall;

[0029] 11. The first cooling wall body; 12. The first expansion joint;

[0030] 20. Second cooling wall; 21. Second cooling wall body;

[0031] 22. Second expansion joint; 23. Second cooling section;

[0032] 30, first tiling; 40, second tiling;

[0033] L1, indentation interval; L2, offset distance;

[0034] 200, blast furnace shell; O, blast furnace centerline;

[0035] 300. Inner mold line. DETAILED DESCRIPTION

[0036] The details of the present invention can be more clearly understood with reference to the accompanying drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should all be considered to belong to the scope of the present invention.

[0037] like Figure 1 , Figure 2 As shown, the present invention provides a cooling stave structure 100, which is arranged on the inner wall of a blast furnace shell 200, wherein the cooling stave structure 100 includes a first cooling stave 10 and a second cooling stave 20 with different thermal conductivity coefficients, the first cooling stave 10 is located above the second cooling stave 20, and the bottom edge of the hot surface of the first cooling stave 10 and the top edge of the hot surface of the second cooling stave 20 have an indentation interval L1 in the horizontal direction. The hot surface of the first cooling stave 10 is covered with a first tiling brick 30, and the hot surface of the second cooling stave 20 is covered with a second tiling brick 40, and the bottom edge of the hot surface of the first tiling brick 30 is flush with the top edge of the hot surface of the second tiling brick 40.

[0038] It should be noted that in the present invention, the first cooling stave 10 and the second cooling stave 20 have their sides facing the blast furnace centerline O as hot sides, and the first cooling stave 10 and the second cooling stave 20 have their sides facing the blast furnace shell as cold sides.

[0039] The cooling wall structure 100 proposed in the present invention includes a first cooling wall 10 and a second cooling wall 20. The first cooling wall 10 and the second cooling wall 20 have different thermal conductivity coefficients and cooling intensities. In this way, the first cooling wall 10 and the second cooling wall 20 will form different slag skin thicknesses during blast furnace production. Through the preset indentation interval L1 between the bottom edge of the hot surface of the first cooling wall 10 and the top edge of the hot surface of the second cooling wall 20, the slag skin at the bottom edge of the first cooling wall 10 and the slag skin at the top edge of the second cooling wall 20 can have different thicknesses but still have a smooth transition, that is, the entire cooling wall structure 100 can be smooth in actual operation after the slag skin is formed, which is beneficial to the effect of blast furnace production and thus improves the blast furnace operation indicators; at the same time, it can also effectively protect the entire cooling equipment and facilitate production operations.

[0040] In an optional example of the present invention, the thermal conductivity of the first cooling stave 10 is less than that of the second cooling stave 20, and the bottom edge of the hot surface of the first cooling stave 10 protrudes inwardly from the top edge of the hot surface of the second cooling stave 20. Specifically, the first cooling stave 10 has a relatively small thermal conductivity and poor cooling strength, and its slag skin formation speed is slow, and the hot surface of the first cooling stave 10 is easily worn without slag skin protection, so that the first cooling stave 10 is thinned. By protruding the bottom edge of the hot surface of the first cooling stave 10 inwardly (toward the center line O of the blast furnace) from the top edge of the hot surface of the second cooling stave 20 (i.e., the hot surface of the second cooling stave 20 is retracted a distance relative to the first cooling stave 10 above), it is possible to avoid the situation that after a period of blast furnace production, the second cooling stave 20 protrudes due to the wear and thinning of the lower part of the first cooling stave 10, and is worn by the descending furnace charge, so that the second cooling stave 20 can be effectively protected, thereby extending the service life of the blast furnace.

[0041] In an optional example of the present invention, the hot surface of the first cooling wall 10 is covered with a first inlay brick 30, and the hot surface of the second cooling wall 20 is covered with a second inlay brick 40. The bottom edge of the hot surface of the first inlay brick 30 is flush with the top edge of the hot surface of the second inlay brick 40, ensuring smooth internal shape in actual operation in the early stage of blast furnace production.

[0042] In an optional example of the present invention, Figures 3 to 7 As shown, the second cooling stave 20 includes a plurality of second cooling sections 23 arranged in sequence from top to bottom, each second cooling section 23 is composed of a plurality of second cooling stave bodies 21 arranged in sequence along the circumference of the blast furnace shell 200, and a vertically arranged second expansion joint 22 is provided between two adjacent second cooling stave bodies 21.

[0043] In an optional example of the present invention, two upper and lower adjacent second expansion joints 22 are aligned.

[0044] In another optional example of the present invention, Figure 6, Figure 7 As shown, two second expansion joints 22 adjacent to each other are staggered, and a staggered distance L2 between the two second expansion joints 22 is smaller than a width of the second expansion joint 22 (ie, two second expansion joints 22 adjacent to each other are slightly staggered).

[0045] In an optional example of the present invention, the second cooling wall body 21 is in the shape of a flat plate.

[0046] Please refer to Figure 3 , Figure 3 This is a comparison diagram of the cooling wall structure proposed by the present invention and the prior art, wherein Figure 3 The left side is the existing technology. Figure 3 The right side is the cooling wall structure proposed by the present invention, such as Figure 3 , Figure 4 As shown, in the prior art, the upper and lower cooling walls 80 are staggered by half the length of the cooling wall body 81 to form a triangular gap 90. In the present invention, as shown in FIG. Figure 5 As shown, aligning or slightly staggering the two adjacent second expansion joints 22 can avoid the occurrence of a triangular gap between the upper and lower second cooling sections, thereby avoiding scouring and damage to the second cooling wall 20 by gas or charge during blast furnace production, thereby extending the service life of the second cooling wall 20.

[0047] In an optional example of the present invention, the first cooling wall 10 is composed of a plurality of first cooling wall bodies 11 arranged in sequence along the circumference of the blast furnace shell 200, and a vertically arranged first expansion joint 12 is provided between two adjacent first cooling wall bodies 11, and the first expansion joint 12 is staggered with the second expansion joint 22 therebelow.

[0048] In an optional example, the first cooling stave 10 is a cast iron cooling stave or a cast steel cooling stave.

[0049] In an optional example, the second cooling wall 20 is a copper cooling wall.

[0050] In another optional example, the second cooling wall 20 is a composite cooling wall, and the hot surface of the composite cooling wall is made of copper material.

[0051] The detailed explanation of the above-mentioned embodiments is only intended to explain the present invention so as to facilitate a better understanding of the present invention. However, these descriptions cannot be interpreted as limitations on the present invention for any reason. In particular, the various features described in different embodiments may also be arbitrarily combined with each other to form other embodiments. Unless there is a clear description to the contrary, these features should be understood to be applicable to any embodiment and are not limited to the described embodiments.

Claims

1. A cooling wall structure, arranged on the inner wall surface of a blast furnace shell, characterized in that: The cooling wall structure comprises a first cooling wall and a second cooling wall with different thermal conductivity coefficients, the first cooling wall is located above the second cooling wall, and the bottom edge of the hot surface of the first cooling wall and the top edge of the hot surface of the second cooling wall have an indented interval in the horizontal direction; The thermal conductivity of the first cooling stave is smaller than that of the second cooling stave, and the bottom edge of the hot surface of the first cooling stave protrudes inwardly from the top edge of the hot surface of the second cooling stave; the hot surface of the first cooling stave is covered with first tiling bricks, and the hot surface of the second cooling stave is covered with second tiling bricks, and the bottom edge of the hot surface of the first tiling bricks is flush with the top edge of the hot surface of the second tiling bricks; The second cooling stave comprises a plurality of second cooling sections arranged in sequence from top to bottom, each of the second cooling sections is formed by a plurality of second cooling stave bodies arranged in sequence along the circumference of the blast furnace shell, and a vertically arranged second expansion joint is provided between two adjacent second cooling stave bodies.

2. The cooling wall structure according to claim 1, characterized in that: Two upper and lower adjacent second expansion joints are arranged in alignment.

3. The cooling wall structure according to claim 1, characterized in that: Two upper and lower adjacent second expansion joints are staggered, and the staggered distance between the two expansion joints is smaller than the width of the second expansion joint.

4. The cooling wall structure according to claim 1, characterized in that: The second cooling wall body is in a flat plate shape.

5. The cooling wall structure according to claim 1, characterized in that: The first cooling wall is a cast iron cooling wall or a cast steel cooling wall.

6. The cooling wall structure according to claim 1, characterized in that: The second cooling wall is a copper cooling wall.

7. The cooling wall structure according to claim 1, characterized in that: The second cooling wall is a composite cooling wall, and the hot surface of the composite cooling wall is made of copper material.

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