Thin-wall cooling wall for blast furnace and manufacturing method

Abstract

The invention discloses a thin-wall cooling wall for a blast furnace and a manufacturing method, and belongs to the technical field of blast furnace cooling equipment. The thin-wall cooling wall further comprises a frame structure which is arranged on the side, close to the blast furnace shell, of the supporting layer in a composite mode and used for increasing the thickness of the thin-wall cooling wall to replace a thick-wall cooling wall. The frame structure has an outline matched with the external size of the supporting layer, and a hollow quadrilateral frame is defined by the first to fourth side ribs; the frame structure further comprises a water inlet pipeline and a water outlet pipeline, the water inlet pipeline and the water outlet pipeline are connected with the cavity channel, the frame structure is further provided with a pipeline protection pipe capable of penetrating through the water inlet pipeline and the water outlet pipeline, and at least one supporting rib is arranged on the periphery of the pipeline protection pipe and connected with the frame structure. Efficient replacement of the composite cooling wall is achieved, the service life of the blast furnace is remarkably prolonged, and safety is improved.

Description

Technical Field

[0001] The invention relates to the technical field of blast furnace cooling equipment, and in particular to a thin-wall cooling wall for a blast furnace and a manufacturing method thereof. Background Art

[0002] In blast furnace production, the cooling wall is one of the key equipment. The main function of the cooling wall is to remove the heat of the high-temperature gas and smoke in the blast furnace through cooling water, so as to maintain the normal operation of the blast furnace. At present, the service life of high-performance blast furnaces is as long as more than 20 years, and the service life of commonly used cast iron cooling walls is only 3-5 years. Traditional cooling walls are made of cast iron materials and have a short service life. They usually cannot reach the designed service life, which leads to the need for frequent replacement of cast iron cooling walls.

[0003] With the development of science and technology, composite cooling staves as a new type of cooling stave technology has gradually received widespread attention. Compared with traditional cast iron cooling staves, composite cooling staves have higher thermal conductivity and resistance to thermal deformation, and can better adapt to the working requirements of the harsh environment of blast furnace cooling, thereby extending the life of the blast furnace, and can also better maintain the temperature stability inside the blast furnace, improving the stability and safety of blast furnace operation.

[0004] When trying to use composite cooling staves to replace cast iron cooling staves, thinner composite cooling staves can achieve the cooling performance of cast iron cooling staves, which leads to technical problems such as the mismatch between the structural dimensions of the cooling staves and the original design dimensions of the cast iron cooling staves and the difficulty in positioning the cooling staves. This often requires changing the size and position of the openings in the furnace shell, which not only increases the difficulty of construction, but may also lead to a reduction in the strength of the furnace shell, affecting the safe operation of the blast furnace. Once the gap between the thin wall and the original furnace shell due to structural mismatch causes high-temperature coal gas to cross-flow in the blast furnace, it will have an adverse effect on production efficiency, product quality, equipment life and safe production. At the same time, the corner areas of the replacement high-performance cooling staves still have insufficient cooling efficiency, which aggravates the problem of thermal stress concentration.

[0005] To this end, a new type of thin-wall cooling stave structure is proposed. Through the coordinated design of the composite frame structure and the micro-cooler design, while maintaining the lightweight advantage of the thin-wall cooling stave, the size matching, efficient cooling and positioning installation of the thin-wall cooling stave are achieved, which can meet the above-mentioned problems of the composite cooling stave replacing the cast iron cooling stave. Summary of the invention

[0006] The present invention aims to provide a thin-wall cooling wall for a blast furnace and a manufacturing method thereof, so as to overcome the deficiencies in the prior art, solve the size adaptation problem and cooling performance problem of the composite cooling wall replacing the cast iron cooling wall through a composite frame structure and a micro-cooler, and at the same time realize the lightweight of the thin-wall cooling wall, improve its cooling performance, avoid the blowby of high-temperature coal gas in the furnace caused by poor adaptation, and effectively improve the safety performance.

[0007] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention includes: According to one aspect of the present invention, there is provided a thin-wall cooling stave for a blast furnace, comprising: a heat exchange layer, which is configured to conduct heat transferred from the blast furnace; a support layer, which is compositely arranged on a side of the heat exchange layer away from the interior of the blast furnace and configured to increase the strength of the heat exchange layer; and one or more cavities, which are arranged between the heat exchange layer and the support layer, occupying part of the heat exchange layer and part of the support layer, and configured to accommodate the passage of cooling water; characterized in that: it also includes a frame structure, which is compositely arranged on a side outside the support layer away from the interior of the blast furnace, and configured to increase the thickness of the thin-wall cooling stave to replace the thick-wall cooling stave; the frame structure has a profile adapted to the external dimensions of the support layer, and is surrounded by first to fourth side ribs to form a hollow quadrilateral frame; it also includes an inlet pipe and an outlet pipe, the inlet pipe and the outlet pipe are connected to the cavity, and the frame structure is also provided with a pipe protective pipe for the inlet pipe and the outlet pipe to pass through, and at least one supporting rib is arranged on the periphery of the pipe protective pipe to be connected to the frame structure.

[0008] According to some embodiments, the thickness L3 of each position of the frame structure satisfies: L3=the thickness L of the original thick-wall cooling wall at the corresponding position-(the thickness L1 of the heat exchange layer+the thickness L2 of the support layer).

[0009] According to some embodiments, the first side rib and / or the second side rib and / or the third side rib and / or the fourth side rib of the frame structure is a micro-cooler, and the micro-cooler includes a micro-heat exchange layer, a micro-support layer and a micro-cooling cavity, the micro-support layer is arranged on the inner side of the micro-heat exchange layer, the micro-cooling cavity is arranged between the heat exchange layer and the support layer, and is configured to accommodate cooling water passing therethrough, the micro-cooling cavity is connected to a micro-water inlet pipe and a micro-water outlet pipe, the micro-water inlet pipe and the micro-water outlet pipe are arranged on the inner side of the micro-cooler along and at a preset distance, and the micro-cooling cavity includes a main water channel opened in a circumferential direction surrounding each micro-cooler.

[0010] According to some embodiments, the first to fourth side ribs of the frame structure are micro-coolers, and the outer surface of the micro-cooler is flush with the outer contour of the supporting layer. The micro-cooler includes a micro-heat exchange layer, a micro-support layer and a micro-cooling cavity. The micro-support layer is arranged on the inner side of the micro-heat exchange layer, and the micro-cooling cavity is arranged between the heat exchange layer and the supporting layer, and is configured to accommodate cooling water passing therethrough. The micro-cooling cavity is connected to a micro-water inlet pipe and a micro-water outlet pipe, and the micro-water inlet pipe and the micro-water outlet pipe are arranged on the inner side of the micro-cooler along and at a preset distance from each other, and the micro-cooling cavity includes a main water channel opened in a circumferential direction surrounding the micro-cooler.

[0011] According to some embodiments, a branch water channel connected to the main water channel of the micro-cooling cavity is provided at an angle of the main water channel of the micro-cooling cavity, and the branch water channel is provided at a certain angle to the main water channel, and the angle is greater than or equal to 10°.

[0012] According to some embodiments, the pipe protective pipe includes a hollow step pipe with a boss, and the hollow step pipe is used to pass through the water inlet pipe and the water outlet pipe of the thin-wall cooling wall; the large diameter side of the hollow step pipe is fixedly connected to the thin-wall cooling wall, and the other large diameter side is in close contact with the outer wall of the furnace shell opening; the small diameter of the hollow step pipe can pass through the furnace shell opening and have a certain gap with the inner wall of the furnace shell opening; an annular groove is opened on the large diameter inner wall of the hollow step pipe close to the circumference of the furnace shell opening, and the inner circle radius of the annular groove is the same as the small diameter radius of the hollow step pipe.

[0013] According to some embodiments, a sealing structure is further included, wherein the sealing structure is disposed on a boss of the hollow step tube, and the sealing structure is made of an elastic material.

[0014] According to some embodiments, the small diameter outer wall of the hollow step tube is provided with threads.

[0015] According to some embodiments, the pipe protection structure is constructed as a box body that can pass through multiple water inlet pipes and water outlet pipes, and a partition is provided in the box body to separate the water inlet pipes and the water outlet pipes, and the partition is fixedly connected to the inner wall of the box body.

[0016] According to some embodiments, a pipe cover is also provided in the box body, and the pipe cover has multiple holes allowing water inlet pipes and water outlet pipes to pass through. The pipe cover is slidably arranged inside the box body, and the box body also specifically has an inner edge to prevent the pipe cover from sliding out.

[0017] According to some embodiments, a micro-pipe protective tube is further provided on the frame structure, and the micro-water inlet pipe and the micro-water outlet pipe share a micro-pipe protective tube.

[0018] According to some embodiments, the micro water inlet pipe, micro water outlet pipe, the water inlet pipe, and the water outlet pipe share a pipe protective tube.

[0019] According to some embodiments, a grid support rib is disposed on an inner wall of the frame structure, and one or more through holes are disposed on the inner wall of the support rib.

[0020] According to some embodiments, a wear-resistant layer is further included, which is compositely arranged in the heat exchange layer near the furnace chamber and is configured to reduce the wear of the heat exchange layer.

[0021] According to some embodiments, the heat exchange layer material is selected from copper, the support layer and the wear-resistant layer material are selected from steel, and the composite form of the heat exchange layer and the support layer, and the heat exchange layer and the wear-resistant layer is explosion welding.

[0022] According to another aspect of the present invention, there is provided a method for manufacturing a thin-wall cooling stave that can replace a thick-wall cooling stave of a blast furnace, using the thin-wall cooling stave structure as described above, the method comprising: (1) Determine the specifications of the thin-wall cooling wall According to the cooling performance and specification size of the thick wall cooling wall, the specification size of the thin wall cooling wall that meets the cooling performance is simulated and calculated, wherein according to the heat load distribution of the original thick wall cooling wall, the thickness of the heat exchange layer is calculated by computer simulation to be L1, so that the thermal conductivity of the heat exchange layer meets the preset cooling efficiency, and according to the mechanical strength requirements, the thickness of the support layer is determined to be L2; Based on the thickness L of the original thick-wall cooling stave, calculate the thickness L3 of the frame structure to satisfy: L3 = L - (L1 + L2), and ensure that the outer contour of the frame structure is compatible with the installation interface of the original thick-wall cooling stave; (2) Construction of a composite structure of thin-wall cooling walls The heat exchange layer and the support layer are compounded by explosion welding to form a thin-walled body with a cavity, and a frame structure is welded on the outside of the support layer. The frame structure is a hollow quadrilateral surrounded by first to fourth side ribs, and the thickness of the side ribs is L3; (3) Arrange cooling water channels and pipelines The positions of the water inlet and outlet pipes of the thin-wall cooling wall are set according to the positions of the water inlet and outlet pipes of the original thick-wall cooling wall, and a straight or curved water channel is set in the thin-wall cooling wall; According to the positions of the original water inlet pipe and the water outlet pipe, a pipe protective pipe is arranged at the corresponding position of the frame structure, the water inlet pipe and the water outlet pipe pass through the pipe protective pipe, and the pipe protective pipe is connected to the frame structure through at least one supporting rib.

[0023] According to some embodiments, the first side rib and / or the second side rib and / or the third side rib and / or the fourth side rib of the frame structure are set as micro-coolers according to the heat load simulation. The micro-cooler is fixedly connected to the supporting layer of the thin-walled cooler. The thickness of the micro-heat exchange layer of the micro-cooler is set to (1 / 6-2 / 3) L1, and the thickness of the micro-support layer is set to (1 / 6-2 / 3) L2.

[0024] In the thin-wall cooling wall of this exemplary embodiment, the main function of the heat exchange layer is to quickly conduct the heat transferred from the inside of the blast furnace to maintain the temperature of the working area stable. The support layer is compositely arranged on the outside of the heat exchange layer, close to the side of the furnace shell, to increase the mechanical strength and durability of the entire cooling wall. The cavity is located between the heat exchange layer and the support layer, and is used to accommodate the circulation of cooling water, which can make the cooling medium closer to the surface that needs to dissipate heat, improve the heat exchange efficiency, and thus effectively reduce the temperature.

[0025] The frame structure of the thin-walled cooling wall of this example embodiment is arranged on the side of the supporting layer close to the blast furnace shell, which can increase the overall thickness of the thin-walled cooling wall, so that it can replace the traditional thick-walled cooling wall without sacrificing performance, ensure the outer dimensions of the original working surface, realize in-situ installation, and ensure good assembly and stability. The hollow quadrilateral frame design surrounded by the first to fourth side ribs provides the necessary support while maintaining the lightweight characteristics. A micro-cooler is arranged on the side of the frame structure, which further increases the cooling area of ​​the cooling wall and reduces the problem of thermal stress concentration on the side wall; the micro-cooler arranged circumferentially has good cooling uniformity, and the micro-cooler branch water channel eliminates corner hot spots, and the thermal stress is reduced by ≥40%.

[0026] The water inlet pipe and the water outlet pipe of the thin-wall cooling wall of this example embodiment are connected to the cavity, and the pipe protective pipe surrounds the periphery of these pipes to provide additional protection to prevent the risk of leakage caused by external impact or wear and extend the service life. The modular protective pipe structure can protect the water inlet and outlet pipes without changing the position and size of the pipe opening, and facilitate the precise positioning of the replacement cooling wall; the step positioning protective pipe and the rubber ring are provided, which can be combined to fit tightly against the inner wall of the furnace shell, provide a small deformation range, prevent deformation of the cooling wall, and at the same time improve the sealing performance between the slurry and the blast furnace shell, prevent the high-temperature coal gas in the furnace from leaking, and effectively improve the safety performance; the inner wall of the frame structure is provided with steel grid support ribs and through holes, which further enhance the strength and rigidity of the frame structure, ensure the stability of the overall structure, and at the same time allow the slurry to flow, which is beneficial to the grouting process of the cooling wall.

[0027] It is to be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below.

[0029] Figure 1 A schematic diagram of a thin wall cooler is shown according to an example embodiment.

[0030] Figure 2 An exploded view of a thin wall cooler stave is shown according to an example embodiment.

[0031] Figure 3 A schematic diagram of a thin-wall cooling wall according to another exemplary embodiment is shown.

[0032] Figure 4A A schematic diagram of a thin-wall cooler and a single-sided fin micro cooler according to another exemplary embodiment is shown.

[0033] Figure 4BA schematic diagram of a pipe protection tube of a thin-wall cooler according to another exemplary embodiment is shown.

[0034] Figure 5A A schematic diagram of a water surround of a microcooler is shown according to an example embodiment.

[0035] Figure 5B A schematic diagram of a water channel branch surrounding a microcooler according to an example embodiment is shown.

[0036] Fig. 6A A cross-sectional view of a pipe guard of a thin-walled cooled stave is shown according to an example embodiment.

[0037] Figure 6B A cross-sectional view showing a positioning guard tube of a thin-wall cooler stave according to an example embodiment.

[0038] Figure 7 A flow chart of a method for manufacturing a thin-wall cooling wall according to an example embodiment is shown. Reference numerals: 101 heat exchange layer; 201 support layer; 301 frame structure; 311 pipeline protection pipe; 401 water inlet pipe; 403 water outlet pipe; 1011 wear-resistant layer; 1012 cavity; 3011 first side rib; 3012 second side rib; 3013 third side rib; 3014 fourth side rib; 3015 supporting rib; 3016 through hole; 3113 box body; 3115 pipe cover plate; 3117 inner edge; 3119 partition; 501 micro cooler; 505 branch water channel; 405 main water channel; 601 furnace shell; 602 cooling wall; 603 annular groove; 605 sealing structure; 5011 micro support layer; 5013 micro heat exchange layer; 5015 micro cooling channel; 5101 micro water inlet pipe; 5102 micro water outlet pipe; 511 Micro Pipe Guard. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0040] In the following detailed description, reference may be made to the various specification drawings that are part of the present application and are used to illustrate specific embodiments of the present application. In the accompanying drawings, similar reference numerals describe substantially similar components in different figures. The various specific embodiments of the present application are described below in sufficient detail so that a person of ordinary skill in the art with relevant knowledge and skills in the art can implement the technical solutions of the present application. It should be understood that other embodiments may also be used or structural, logical or electrical changes may be made to the embodiments of the present application.

[0041] Traditional cooling staves are made of cast iron, but their service life is short and usually cannot reach the designed service life, so they need to be replaced frequently. With the development of science and technology, composite cooling staves as a new type of cooling stave technology have gradually attracted widespread attention. When replacing cast iron cooling staves, the use of high-performance composite cooling staves can reduce the number of repairs and significantly reduce manufacturing costs, operating costs and maintenance costs.

[0042] The copper-steel composite cooling stave is made of copper and steel. It has the high thermal conductivity of copper and the strength and corrosion resistance of steel. It can operate stably for a long time in high temperature environment. Compared with traditional cast iron cooling staves, composite cooling staves have higher thermal efficiency, longer service life and lower maintenance cost.

[0043] However, new technical issues also need to be considered: there are differences in size and structure between the composite cooling stave and the cast iron cooling stave. How to ensure that the new composite cooling stave can be accurately installed in the original space and can be well adapted to the furnace shell, lining and other components of the blast furnace to avoid installation difficulties or interference with surrounding components? For the cast iron cooling staves at the connection points of the furnace shell with different inclination angles, the size and structure differences faced by replacing the high-performance composite cooling stave are even greater. Once the high-temperature coal gas in the blast furnace is blowby due to structural mismatch, it will have an adverse effect on production efficiency, product quality, equipment life and safe production.

[0044] When trying to use composite cooling staves to replace cast iron cooling staves, because the thinner composite cooling staves can achieve the cooling performance of the original cast iron cooling staves, it brings about technical problems such as the mismatch between the structural dimensions of the cooling staves and the original design dimensions of the cast iron cooling staves, and the difficulty in positioning the cooling staves. This often requires changing the opening size and position of the furnace shell, which not only increases the difficulty of construction, but also may lead to a reduction in the strength of the furnace shell, affecting the safe operation of the blast furnace. Once the gap between the thin wall and the original furnace shell due to structural mismatch causes high-temperature coal gas to cross-flow in the blast furnace, it will have an adverse effect on production efficiency, product quality, equipment life and safe production. At the same time, the corner areas of the replacement high-performance cooling staves still have insufficient cooling efficiency, which aggravates the problem of thermal stress concentration.

[0045] To this end, the present invention proposes a new type of thin-wall cooling wall structure, which not only solves the adaptation problem of the composite cooling wall replacing the cast iron cooling wall, but also achieves efficient cooling and sealing enhancement of the thin-wall cooling wall while maintaining the lightweight advantage of the thin-wall cooling wall through the coordinated design of the composite frame structure and the micro-cooler design, which can meet the above-mentioned problems of the composite cooling wall replacing the cast iron cooling wall.

[0046] The thick-walled cooling stave (first cooling stave) referred to in this plan refers to the cast iron cooling stave used in the initial design of the blast furnace, which is thick in size; the thin-walled cooling stave (second cooling stave) refers to the copper cooling stave or composite cooling stave with the same cooling performance as the cast iron cooling stave, which is thin in size and is used to replace the cast iron cooling stave that is difficult to continue to use; the micro cooler is a cooler arranged on the side wall of the thin-walled cooling stave, which is smaller in size than the thin-walled cooling stave and is used to replace the frame structure while improving the cooling performance of the cooling stave.

[0047] Exemplary embodiments of the present invention are described below with reference to the accompanying drawings.

[0048] Figure 1 A schematic diagram of a thin wall cooler is shown according to an example embodiment.

[0049] Figure 2 An exploded view of a thin wall cooler stave is shown according to an example embodiment.

[0050] According to an example embodiment, see Figure 1 The thin-wall cooling wall for blast furnace comprises a heat exchange layer 101, a support layer 201, a frame structure 301, a water inlet pipe 401 and a water outlet pipe 403. The frame structure 301 also has a pipe protection pipe 311 capable of passing through the water inlet pipe 401 and the water outlet pipe 403.

[0051] The heat exchange layer 101 is configured to conduct heat transferred from the blast furnace. The support layer 201 is compositely disposed outside the heat exchange layer 101 and close to a side of the furnace shell. The support layer 201 is configured to increase the strength of the heat exchange layer 101 .

[0052] See also Figure 2 At least one supporting rib 3015 is disposed on the periphery of the pipeline protection pipe 311 and connected to the frame structure 301. The one or more cavities 1012 of the thin-wall cooling wall for blast furnace are disposed between the heat exchange layer 101 and the supporting layer 201. The cavity 1012 is configured to accommodate cooling water. The water inlet pipe 401 and the water outlet pipe 403 are connected to the cavity 1012.

[0053] The frame structure 301 is compositely arranged on one side of the support layer 201 close to the blast furnace shell, and is configured to increase the thickness of the thin-wall cooling wall to replace the thick-wall cooling wall. The frame structure 301 has a profile adapted to the external dimensions of the support layer 201, and is surrounded by the first to fourth side ribs to form a hollow quadrilateral frame.

[0054] The inner wall of the frame structure 301 is provided with a grid support rib 3015 , and the inner wall of the support rib 3015 is provided with one or more through holes 3016 .

[0055] The frame structure of this embodiment adopts a hollow structure design, which reduces weight while maintaining good strength, which is conducive to improving cooling efficiency. The inner wall of the frame structure is provided with steel grid support ribs and through holes, which further enhances the strength and rigidity of the frame structure, ensures the stability of the overall structure, and allows the slurry to flow, which is conducive to the grouting process of the cooling wall.

[0056] The frame structure of this example embodiment is compositely arranged on one side of the supporting layer close to the blast furnace shell, which increases the thickness of the thin-wall cooling wall, ensures the outer dimensions of the original working surface, and can effectively replace the thick-wall cooling wall to achieve in-situ installation.

[0057] According to some embodiments, the thin-wall cooling stave further includes a wear-resistant layer 1011, which is compositely arranged in the heat exchange layer 101 near the furnace chamber, and is configured to reduce the wear of the heat exchange layer. The heat exchange layer 101 is made of copper, and the support layer 201 and the wear-resistant layer 1011 are made of steel. The composite form of the heat exchange layer 101 and the support layer 201, and the heat exchange layer 101 and the wear-resistant layer 1011 is explosion welding.

[0058] According to some embodiments, the thick wall cooling wall is a rectangular parallelepiped or a special-shaped body, and the thickness L3 at each position of the frame structure 301 satisfies: L3 = thickness of the original thick wall cooling wall at the corresponding position L-(heat exchange layer thickness L1 + support layer thickness L2).

[0059] Figure 3 A schematic diagram of a thin-wall cooling wall according to another exemplary embodiment is shown.

[0060] According to the exemplary embodiment, the frame structure 301 has a profile adapted to the outer dimensions of the support layer, and is surrounded by the first to fourth side ribs 3011 to 3014 to form a hollow quadrilateral frame. The first side rib 3011 and / or the second side rib 3012 and / or the third side rib 3013 and / or the fourth side rib 3014 of the frame structure 301 are micro coolers.

[0061] Figure 4A , 4B A schematic diagram of a thin-wall cooler and a single-sided fin micro cooler and a pipeline protection tube according to another exemplary embodiment are shown.

[0062] See also Figure 4B The micro cooler 501 includes a micro heat exchange layer 5013, a micro support layer 5011 and a micro cooling cavity 5015. The micro support layer 5011 is arranged on the inner side of the micro heat exchange layer 5013. The micro cooling cavity 5015 is arranged between the micro heat exchange layer 5013 and the micro support layer 5011, and is configured to accommodate cooling water passing therethrough. The micro cooling cavity 5015 is connected to a micro water inlet pipe 5101 and a micro water outlet pipe 5102. The micro water inlet pipe 5101 and the micro water outlet pipe 5102 are arranged on the inner side of the micro cooler 501 and are spaced apart by a preset distance. The micro cooling cavity 5015 is arranged as a main water channel opened in the circumferential direction of the single side rib.

[0063] According to some embodiments, see Figure 4A The micro water inlet pipe 5101 , the micro water outlet pipe 5102 , the water inlet pipe 401 , and the water outlet pipe 403 share a pipe protection box 3113 .

[0064] Figure 5A A schematic diagram of a water surround of a microcooler is shown according to an example embodiment.

[0065] According to some embodiments, the first side rib 3011 and / or the second side rib 3012 and / or the third side rib 3013 and / or the fourth side rib 3014 of the frame structure are micro coolers, and the micro cooling channel 5015 includes a main water channel opened in the circumferential direction around each micro cooler. Figure 5A As shown, the fourth side rib 3014 is a micro cooler, and the micro cooling channel 5015 includes a main water channel opened in the circumferential direction around the micro cooler on the fourth side rib. If the second side rib 3012 and the fourth side rib 3014 are micro coolers, the micro cooling channel 5015 includes two main water channels opened in the circumferential direction around the micro cooler on the second side rib 3012 and the fourth side rib 3014. According to another embodiment, the first to fourth side ribs 3011~3014 of the frame structure are micro coolers, and the micro cooling channel 5015 includes a main water channel opened in the circumferential direction around the micro cooler.

[0066] according to Figure 5B As shown, at the water channel angle position of the micro-cooling cavity 5015, a branch water channel 505 connected to the water channel of the micro-cooling cavity is provided, and the branch water channel 505 is provided at a certain angle with the main water channel 405, and the angle is greater than or equal to 10°. The micro-cooler arranged circumferentially has good cooling uniformity, and the micro-cooler branch water channel eliminates corner hot spots, and the thermal stress is reduced by ≥40%.

[0067] The pipeline protection tube 311 can be configured in various ways. Figure 2As shown, the pipeline protection tube 311 is configured as a hollow tube that can accommodate the water inlet pipe and the water outlet pipe to pass through.

[0068] Further, according to Fig. 6A , Figure 6B As shown, the pipe protective tube 311 includes a hollow step pipe with a boss, and the hollow step pipe is used to pass through the water inlet pipe 401 or the water outlet pipe 403 of the thin-wall cooling wall; one side of the large diameter of the hollow step pipe is fixedly connected to the thin-wall cooling wall 602, and the other side of the large diameter is in close contact with the outer wall of the furnace shell 601 opening; the small diameter of the hollow step pipe can pass through the furnace shell opening and have a certain gap with the inner wall of the furnace shell opening; an annular groove 603 is opened on the large diameter inner wall of the hollow step pipe close to the circumference of the furnace shell opening, and the inner circle radius of the annular groove 603 is the same as the small diameter radius of the hollow step pipe.

[0069] See also Figure 6B The thin-wall cooling wall also includes a sealing structure 605, which is arranged on the boss of the hollow step tube, and the sealing structure 605 is made of elastic material.

[0070] According to some embodiments, a thin-wall cooling wall is protected by a pipe, and the outer wall of the hollow step pipe with a small diameter is provided with threads.

[0071] according to Figure 2 As shown in the figure, the pipe protection structure can also be constructed as a box 3113 that can pass through multiple water inlet pipes and water outlet pipes. The box 3113 is provided with a partition 3119 that divides the water inlet pipe and the water outlet pipe, and the partition 3119 is fixedly connected to the inner wall of the box.

[0072] according to Figure 2 As shown, further, a pipe cover plate 3115 is arranged in the box body of the pipe protective tube 311, and the pipe cover plate 3115 has a plurality of holes allowing the water inlet pipe and the water outlet pipe to pass through. The pipe cover plate 3115 is slidably arranged inside the box body 3113, and the box body 3113 also specifically has an inner edge 3117 to prevent the pipe cover plate from sliding out.

[0073] It should be understood that the pipeline protection structure can be selected from the most suitable structure mentioned above according to actual needs.

[0074] according to Figure 5A As shown, a micro-pipeline protective tube 511 is also provided on the frame structure, and the micro-water inlet pipe 5101 and the micro-water outlet pipe 5102 share a micro-pipeline protective tube 511. The micro-pipeline protective tube structure can be selected from one of the above-mentioned pipe protective tube structures according to actual conditions.

[0075] The pipeline protection pipe of this example embodiment has a reasonable structural design, which can effectively protect the water inlet pipe and the water outlet pipe and extend the service life. The modular protection pipe structure can protect the water inlet and outlet pipes without changing the position and size of the pipeline opening, and facilitates the precise positioning of the cooling wall.

[0076] The step positioning protective tube and rubber ring can be combined to fit tightly against the inner wall of the furnace shell, providing a small deformation range to prevent deformation of the cooling wall. At the same time, it improves the sealing performance between the slurry and the blast furnace shell, prevents high-temperature coal gas from leaking into the furnace, and effectively improves safety performance.

[0077] The present invention also provides a method for manufacturing a thin-wall cooling wall that can replace the thick-wall cooling wall of a blast furnace, and obtains the specifications and dimensions of the thin-wall cooling wall that meet the cooling performance based on the cooling performance and specifications and dimensions of the thick-wall cooling wall through simulation calculation.

[0078] Figure 7 A flow chart of a method for manufacturing a thin-wall cooling wall according to an example embodiment is shown.

[0079] See also Figure 7 , in S101, the specification parameters of the thin-wall cooling wall are determined.

[0080] According to an example embodiment, the specifications and dimensions of a thin-wall cooling wall that meet the cooling performance are simulated and calculated based on the cooling performance and specifications and dimensions of a thick-wall cooling wall, wherein the thickness of the heat exchange layer is calculated to be L1 through computer simulation based on the heat load distribution of the original thick-wall cooling wall, so that the thermal conductivity of the heat exchange layer meets the preset cooling efficiency, and the thickness of the support layer is determined to be L2 based on the mechanical strength requirements.

[0081] Based on the thickness L of the original thick-wall cooling stave, the thickness L3 of the frame structure is calculated to satisfy: L3 = L - (L1 + L2), and ensure that the outer contour of the frame structure is compatible with the installation interface of the original thick-wall cooling stave.

[0082] In S103, a composite structure of a thin-wall cooling wall is constructed.

[0083] According to some embodiments, the heat exchange layer and the support layer are compounded by explosion welding to form a thin-walled body having the cavity, and a frame structure is welded on the outside of the support layer. The frame structure is a hollow quadrilateral surrounded by first to fourth side ribs, and the thickness of the side ribs is L3.

[0084] In S105, cooling water channels and pipelines are arranged.

[0085] According to an exemplary embodiment, the positions of the water inlet pipe and the water outlet pipe of the thin-wall cooling stave are set according to the positions of the water inlet pipe and the water outlet pipe of the original thick-wall cooling stave, and a straight or curved water channel is set in the thin-wall cooling stave. According to the positions of the original water inlet pipe and the water outlet pipe, a pipe protective pipe is set at a corresponding position of the frame structure, and the water inlet pipe and the water outlet pipe pass through the pipe protective pipe, and the pipe protective pipe is connected to the frame structure through at least one supporting rib.

[0086] According to the heat load simulation, the first side rib and / or the second side rib and / or the third side rib and / or the fourth side rib of the frame structure are set as micro-coolers, and the micro-cooler is fixedly connected to the supporting layer of the thin-walled cooler; the thickness of the micro-heat exchange layer of the micro-cooler is set to (1 / 6-2 / 3) L1, and the thickness of the micro-support layer is set to (1 / 6-2 / 3) L2.

[0087] The thin-wall cooling wall for blast furnace and the manufacturing method of the thin-wall cooling wall proposed in the present invention reduce the weight of the cooling wall in terms of material, enhance the stability of the cooling wall in terms of structure, improve the performance of the cooling wall, and greatly improve various operating indicators and economic indicators of the blast furnace compared with the traditional cast iron cooling wall.

[0088] When the thin-wall cooling stave of the present invention is used to replace the thick cast iron cooling stave, the pipeline opening position is the original cast iron cooling stave opening position, and the additional steel structure on the basis of the original furnace shell opening is not changed. Not only can the original working surface dimensions be guaranteed, but also the structural strength of the thin-wall cooling stave can be enhanced.

[0089] Those skilled in the art can clearly understand that the “unit” and “module” in this specification refer to devices and / or components that can independently complete a specific function or cooperate with other components.

[0090] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0091] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0092] In the several embodiments provided by the present invention, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only schematic, such as the division of units, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system.

[0093] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0094] The exemplary embodiments of the present invention are specifically shown and described above. It should be understood that the present invention is not limited to the detailed structure, configuration or implementation method described herein; on the contrary, the present invention is intended to cover various modifications and equivalent configurations included in the spirit and scope of the attached clauses.

Claims

1. A thin-wall cooling wall for a blast furnace, comprising: a heat exchange layer configured to conduct heat transferred from the blast furnace; A support layer, which is compositely arranged on the side of the heat exchange layer away from the interior of the blast furnace, and is configured to increase the strength of the heat exchange layer; and one or more cavities, which are arranged between the heat exchange layer and the support layer, occupying part of the heat exchange layer and part of the support layer, and are configured to accommodate the passage of cooling water; characterized in that: it also includes a frame structure, which is compositely arranged on the side outside the support layer away from the interior of the blast furnace, and is configured to increase the thickness of the thin-walled cooling wall to replace the thick-walled cooling wall; the frame structure has a contour adapted to the external dimensions of the support layer, and is surrounded by first to fourth side ribs to form a hollow quadrilateral frame; it also includes an inlet pipe and an outlet pipe, which are connected to the cavity, and the frame structure is also provided with a pipe protective pipe for the inlet pipe and the outlet pipe to pass through, and at least one supporting rib is arranged on the periphery of the pipe protective pipe to be connected to the frame structure.

2. The thin-wall cooling wall according to claim 1, characterized in that: The thickness L3 at each position of the frame structure satisfies: L3=the thickness L at the corresponding position of the original thick-wall cooling wall-(the thickness L1 of the heat exchange layer+the thickness L2 of the support layer).

3. The thin-wall cooling wall according to claim 1, characterized in that: The first side rib and / or the second side rib and / or the third side rib and / or the fourth side rib of the frame structure is a micro-cooler, and the micro-cooler includes a micro-heat exchange layer, a micro-support layer and a micro-cooling cavity, the micro-support layer is arranged on the inner side of the micro-heat exchange layer, the micro-cooling cavity is arranged between the micro-heat exchange layer and the micro-support layer, and is configured to accommodate cooling water passing therethrough, the micro-cooling cavity is connected to a micro-water inlet pipe and a micro-water outlet pipe, the micro-water inlet pipe and the micro-water outlet pipe are arranged on the inner side of the micro-cooler along and at a preset distance, and the micro-cooling cavity includes a main water channel opened in a circumferential direction surrounding each micro-cooler.

4. The thin-wall cooling wall according to claim 1, characterized in that: The first to fourth side ribs of the frame structure are micro coolers, and the outer surface of the micro cooler is flush with the outer contour of the support layer. The micro cooler includes a micro heat exchange layer, a micro support layer and a micro cooling cavity. The micro support layer is arranged on the inner side of the micro heat exchange layer, and the micro cooling cavity is arranged between the micro heat exchange layer and the micro support layer, and is configured to accommodate cooling water passing therethrough. The micro cooling cavity is connected to a micro water inlet pipe and a micro water outlet pipe, and the micro water inlet pipe and the micro water outlet pipe are arranged on the inner side of the micro cooler along and at a preset distance from each other. The micro cooling cavity includes a main water channel opened in a circumferential direction surrounding the micro cooler.

5. The thin-wall cooling wall according to claim 3 or 4, characterized in that: A branch water channel connected to the main water channel of the micro-cooling cavity is provided at the angle position of the main water channel of the micro-cooling cavity. The branch water channel is provided at a certain angle to the main water channel, and the angle is greater than or equal to 10°.

6. The thin-wall cooling stave according to any one of claims 1 to 4, characterized in that: The pipeline protection pipe includes a hollow step pipe with a boss, and the hollow step pipe is used to pass through the water inlet pipe and the water outlet pipe of the thin-wall cooling wall; the large diameter side of the hollow step pipe is fixedly connected to the thin-wall cooling wall, and the other large diameter side is in close contact with the outer wall of the furnace shell opening; the small diameter of the hollow step pipe can pass through the blast furnace shell opening and has a certain distance from the inner wall of the blast furnace shell opening; an annular groove is opened on the large diameter inner wall of the hollow step pipe close to the circumference of the furnace shell opening, and the inner circle radius of the annular groove is the same as the small diameter radius of the hollow step pipe.

7. The thin-wall cooling stave according to claim 6, characterized in that: It also includes a sealing structure, which is arranged on the boss of the hollow step tube and is made of elastic material.

8. The thin-wall cooling wall according to claim 6, characterized in that: The small-diameter outer wall of the hollow step pipe is provided with threads.

9. The thin-wall cooling stave according to any one of claims 1 to 4, characterized in that: The pipeline protection structure is constructed as a box body capable of passing through a plurality of water inlet pipes and water outlet pipes. A partition is arranged in the box body to separate the water inlet pipes and the water outlet pipes, and the partition is fixedly connected to the inner wall of the box body.

10. The thin-wall cooling wall according to claim 9, characterized in that: The box body is provided with a pipe cover plate, which is provided with a plurality of holes for allowing water inlet pipes and water outlet pipes to pass through. The pipe cover plate is slidably arranged inside the box body, and the box body further specifically has an inner edge to prevent the pipe cover plate from sliding out.

11. The thin-wall cooling wall according to claim 3 or 4, characterized in that: A micro-pipeline protective tube is also provided on the frame structure, and the micro-water inlet pipe and the micro-water outlet pipe share a micro-pipeline protective tube.

12. The thin-wall cooling wall according to claim 3 or 4, characterized in that: The micro water inlet pipe, micro water outlet pipe, water inlet pipe and water outlet pipe share a pipe protection pipe.

13. The thin-wall cooling wall according to any one of claims 1-5, 7-8, characterized in that: The inner wall of the frame structure is provided with a grid support rib, and the inner wall of the support rib is provided with one or more through holes.

14. The thin-wall cooling wall according to any one of claims 1-5, 7-8, characterized in that: It also includes a wear-resistant layer, which is compositely arranged in the heat exchange layer near the furnace chamber and configured to reduce the wear of the heat exchange layer.

15. The thin-wall cooling stave according to claim 14, characterized in that: The heat exchange layer material is selected from copper, and the support layer and the wear-resistant layer material are selected from steel. The composite form of the heat exchange layer and the support layer, and the heat exchange layer and the wear-resistant layer is explosion welding.

16. A method for manufacturing a thin-wall cooling stave that can replace a thick-wall cooling stave of a blast furnace, using the thin-wall cooling stave as claimed in any one of claims 1 to 15, characterized in that: (1) Determine the specifications of the thin-wall cooling wall According to the cooling performance and specification size of the thick-wall cooling wall, the specification size of the thin-wall cooling wall that meets the cooling performance is simulated and calculated, wherein, according to the heat load distribution of the original thick-wall cooling wall, the thickness of the heat exchange layer is calculated by computer simulation as L1, so that the thermal conductivity of the heat exchange layer meets the preset cooling efficiency; according to the mechanical strength requirements, the thickness of the support layer is determined to be L2; based on the thickness L of the original thick-wall cooling wall, the thickness L3 of the frame structure is calculated to meet the following requirements: L3 = L - (L1 + L2), and ensure that the outer contour of the frame structure is compatible with the installation interface of the original thick-wall cooling wall; (2) Construction of composite structure of thin-wall cooling wall The heat exchange layer and the support layer are compounded by explosion welding to form a thin-walled body with a cavity, and a frame structure is welded on the outside of the support layer. The frame structure is a hollow quadrilateral surrounded by first to fourth side ribs, and the thickness of the side ribs is L3; (3) Arrange cooling water channels and pipelines The positions of the water inlet pipe and the water outlet pipe of the thin-wall cooling wall are set according to the positions of the water inlet pipe and the water outlet pipe of the original thick-wall cooling wall, and a straight or curved water channel is set in the thin-wall cooling wall; According to the positions of the original water inlet pipe and the water outlet pipe, a pipe protective pipe is arranged at the corresponding position of the frame structure, the water inlet pipe and the water outlet pipe pass through the pipe protective pipe, and the pipe protective pipe is connected to the frame structure through at least one supporting rib.

17. The manufacturing method according to claim 16, further comprising: According to the thermal load simulation, the first side rib and / or the second side rib and / or the third side rib and / or the fourth side rib of the frame structure are arranged as micro coolers, and the micro coolers are fixedly connected to the supporting layer of the thin-wall cooler.

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