A thin-wall cooling stave for blast furnace and its manufacturing method

Abstract

The present invention discloses a thin-walled cooling stave for blast furnace and a manufacturing method thereof, belonging to the technical field of blast furnace cooling equipment. The thin-walled cooling stave further includes a frame structure, which is compositely arranged on the side of the support layer close to the blast furnace shell, and is configured to increase the thickness of the thin-walled cooling stave for replacing the thick-walled cooling stave; the frame structure has a contour adapted to the external dimensions of the support layer, and is surrounded by the first to fourth side ribs to form a hollow quadrilateral frame; it further includes a water inlet pipe and a water outlet pipe, the water inlet pipe and the water outlet pipe are connected to the cavity, and the frame structure further has a pipe protection tube capable of passing through the water inlet pipe and the water outlet pipe, and at least one support rib is arranged around the pipe protection tube and connected to the frame structure. This solution realizes the efficient replacement of the composite cooling stave, significantly extends the service life of the blast furnace and improves safety.

Description

Technical Field

[0001] The present invention relates to the technical field of blast furnace cooling equipment, and particularly relates to a thin-walled cooling stave for blast furnace and a manufacturing method thereof. Background Art

[0002] In blast furnace production, the cooling stave is one of the key equipment. The main function of the cooling stave is to take away the heat of the high-temperature gas and dust 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 can reach more than 20 years, while the service life of commonly used cast iron cooling staves is only 3 - 5 years. Due to the use of cast iron materials, the service life of traditional cooling staves is relatively short and usually cannot reach the designed service life, which leads to frequent replacement of cast iron cooling staves.

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

[0004] When trying to replace cast iron cooling staves with composite cooling staves, a thinner composite cooling stave can achieve the cooling performance of a cast iron cooling stave, which in turn brings technical problems such as the mismatch between the structural dimensions of the cooling stave and the original design dimensions of the cast iron cooling stave, and the difficulty in positioning the cooling stave. This often requires changing the opening size and position of the furnace shell, which not only increases the construction difficulty but also may lead to a reduction in the strength of the furnace shell, affecting the safe operation of the blast furnace. Once high-temperature gas in the blast furnace leaks through the gap between the thin wall and the original furnace shell due to structural mismatch, it will have an adverse impact on production efficiency, product quality, equipment life, and safety production. At the same time, there are also problems of insufficient cooling efficiency and intensified thermal stress concentration in the corner areas of high-performance cooling staves during replacement.

[0005] Therefore, a new type of thin-walled cooling stave structure is proposed. Through the collaborative design of a composite frame structure and a micro cooler design, while maintaining the lightweight advantage of the thin-walled cooling stave, the size matching, efficient cooling, and positioning and installation of the thin-walled cooling stave are realized, which can solve the above problems of replacing cast iron cooling staves with composite cooling staves. Summary of the Invention

[0006] The present invention aims to provide a thin-walled cooling stave for blast furnace and a manufacturing method thereof to overcome the deficiencies in the prior art. By using a composite frame structure and a micro cooler, the size adaptation problem and cooling performance problem of replacing cast iron cooling staves with composite cooling staves are solved. At the same time, the lightweight of the thin-walled cooling stave is realized, its cooling performance is improved, the leakage of high-temperature gas in the furnace caused by poor adaptation is avoided, and the safety performance is effectively improved.

[0007] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention includes:

[0008] 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.

[0009] 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).

[0010] 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.

[0011] 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.

[0012] According to some embodiments, at the bending position of the main water channel of the micro cooling channel, a branch water channel connected to the main water channel of the micro cooling channel is provided. The branch water channel is arranged at an angle with the main water channel, and the angle is greater than or equal to 10°.

[0013] According to some embodiments, the pipeline protection tube includes a hollow stepped tube with a boss. The hollow stepped tube is used to pass through the water inlet pipe and the water outlet pipe of the thin-walled cooling wall. One side with a larger diameter of the hollow stepped tube is fixedly connected to the thin-walled cooling wall, and the other side with a larger diameter is in close contact with the outer wall of the opening of the furnace shell. The smaller diameter of the hollow stepped tube can pass through the opening of the furnace shell and has a certain gap with the inner wall of the opening of the furnace shell. An annular groove is opened at the inner wall of the larger diameter of the hollow stepped tube close to the circumferential direction of the furnace shell opening, and the inner radius of the annular groove is the same as the radius of the smaller diameter of the hollow stepped tube.

[0014] According to some embodiments, a sealing structure is further included. The sealing structure is arranged on the boss of the hollow stepped tube, and the sealing structure is made of an elastic material.

[0015] According to some embodiments, the outer wall of the smaller diameter of the hollow stepped tube is provided with threads.

[0016] According to some embodiments, the pipeline protection tube structure is constructed as a box body capable of passing through multiple water inlet pipes and water outlet pipes. A partition for separating the water inlet pipes and the water outlet pipes is arranged in the box body, and the partition is fixedly connected to the inner wall of the box body.

[0017] According to some embodiments, a pipeline cover plate is further arranged in the box body. The pipeline cover plate is provided with a plurality of holes allowing the water inlet pipes and the water outlet pipes to pass through. The pipeline cover plate is slidably arranged inside the box body, and the box body further has an inner edge for preventing the pipeline cover plate from sliding out.

[0018] According to some embodiments, a micro pipeline protection tube is further arranged on the frame structure, and the micro water inlet pipe and the micro water outlet pipe share a micro pipeline protection tube.

[0019] According to some embodiments, the micro water inlet pipe and the micro water outlet pipe share a pipeline protection tube with the water inlet pipe and the water outlet pipe.

[0020] According to some embodiments, grid support ribs are arranged on the inner wall of the frame structure, and one or more through holes are arranged on the inner wall of the support ribs.

[0021] According to some embodiments, a wear-resistant layer is further included, which is compositely arranged on the side close to the furnace cavity in the heat exchange layer, and is configured to reduce the wear of the heat exchange layer.

[0022] According to some embodiments, the material of the heat exchange layer is selected from copper, and the materials of the support layer and the wear-resistant layer are selected from steel. The composite forms of the heat exchange layer with the support layer and the heat exchange layer with the wear-resistant layer are explosive welding.

[0023] According to another aspect of the present invention, there is provided a manufacturing method of a thin-wall cooling stave that can replace a thick-wall cooling stave of a blast furnace. Adopting the thin-wall cooling stave structure as described above, the method includes:

[0024] (1) Determine the specification parameters of the thin-wall cooling stave

[0025] According to the cooling performance and specification dimensions of the thick-wall cooling stave, the specification dimensions of the thin-wall cooling stave that meet the cooling performance are simulated and calculated. Among them, according to the heat load distribution of the original thick-wall cooling stave, the thickness of the heat exchange layer L1 is calculated by computer simulation 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 L2 is determined;

[0026] 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 it is ensured that the outer contour of the frame structure is adapted to the installation interface of the original thick-wall cooling stave;

[0027] (2) Construct the composite structure of the thin-wall cooling stave

[0028] The heat exchange layer and the support layer are compounded by explosive welding to form a thin-wall main body with cavities. The frame structure is welded on the outside of the support layer. The frame structure is a hollow quadrilateral surrounded by the first to fourth side ribs, and the thickness of the side ribs is L3;

[0029] (3) Arrange the cooling water channels and pipes

[0030] According to the positions of the water inlet pipe and the water outlet pipe of the original thick-wall cooling stave, the positions of the water inlet pipe and the water outlet pipe of the thin-wall cooling stave are set. Straight or curved water channels are arranged in the thin-wall cooling stave;

[0031] According to the positions of the original water inlet pipe and the water outlet pipe, pipe protectors are arranged at the corresponding positions of the frame structure. The water inlet pipe and the water outlet pipe pass through the pipe protectors, and the pipe protectors are connected to the frame structure through at least one support rib.

[0032] According to some embodiments, 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. The micro-coolers are fixedly connected to the support layer of the thin-wall 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.

[0033] For the thin-walled cooling stave of the 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 keep the temperature of the working area stable. The support layer is compositely arranged on the outside of the heat exchange layer, near the side of the furnace shell, to increase the mechanical strength and durability of the entire cooling stave. The cavity is located between the heat exchange layer and the support layer and is used to accommodate the circulation of cooling water, enabling the cooling medium to be closer to the surface that needs to dissipate heat, improving the heat exchange efficiency, and thus effectively reducing the temperature.

[0034] The frame structure of the thin-walled cooling stave of the exemplary embodiment is arranged on the side of the support layer close to the blast furnace shell, which can increase the overall thickness of the thin-walled cooling stave, enabling it to replace the traditional thick-walled cooling stave without sacrificing performance, ensuring the external dimensions of the original working surface, realizing in-situ installation, and ensuring good assembly and stability. The design of the hollow quadrilateral frame surrounded by the first to fourth side ribs not only provides the necessary support but also maintains the lightweight characteristic. The side of the frame structure is provided with micro-coolers, which further increase the cooling area of the cooling stave and reduce the problem of concentrated thermal stress on the side walls; the circumferentially arranged micro-coolers have good cooling uniformity, and the branch water channels of the micro-coolers eliminate the hot spots at the corners, and the thermal stress is reduced by ≥40%.

[0035] The inlet pipe and the outlet pipe of the thin-walled cooling stave of the exemplary embodiment are connected to the cavity, and the pipe protection tubes surround the periphery of these pipes to provide additional protection against the risk of leakage caused by external impact or abrasion, extend the service life. The modular protection tube structure can protect the inlet and outlet pipes without changing the opening position and size of the pipes, and at the same time facilitate the accurate positioning of the replacement of the cooling stave; the stepped positioning protection tube and the rubber ring are provided to be able to fit tightly against the inner wall of the furnace shell in combination, providing a small deformation range, preventing the deformation of the cooling stave, and at the same time improving the sealing performance between the slurry and the blast furnace shell, preventing the high-temperature gas in the furnace from leaking, and effectively improving 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 enable the slurry to flow, facilitating the grouting process of the cooling stave.

[0036] It should be understood that the above general description and the following detailed description are only exemplary and do not limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below.

[0038] Figure 1 A schematic diagram showing a thin-walled cooling stave according to an exemplary embodiment.

[0039] Figure 2 An exploded view showing a thin-walled cooling stave according to an exemplary embodiment.

[0040] Figure 3 Schematic diagram showing a thin - walled cooling wall according to another exemplary embodiment.

[0041] Figure 4A Schematic diagram showing a single - side rib micro - cooler of a thin - walled cooler according to another exemplary embodiment.

[0042] Figure 4B Schematic diagram of a pipe protection tube of a thin - walled cooler according to another exemplary embodiment.

[0043] Figure 5A Schematic diagram showing a surrounding water channel of a micro - cooler according to an exemplary embodiment.

[0044] Figure 5B Schematic diagram showing a branch of the surrounding water channel of a micro - cooler according to an exemplary embodiment.

[0045] Figure 6A Cross - sectional view showing a pipe protection tube of a thin - walled cooling wall according to an exemplary embodiment.

[0046] Figure 6B Cross - sectional view showing a positioning protection tube of a thin - walled cooling wall according to an exemplary embodiment.

[0047] Figure 7 Flowchart showing a manufacturing method of a thin - walled cooling wall according to an exemplary embodiment.

[0048] Reference numerals:

[0049] 101 Heat - exchange layer; 201 Support layer; 301 Frame structure; 311 Pipe protection tube;

[0050] 401 Inlet pipe; 403 Outlet pipe; 1011 Wear - resistant layer; 1012 Channel;

[0051] 3011 First side rib; 3012 Second side rib; 3013 Third side rib; 3014 Fourth side rib;

[0052] 3015 Support rib; 3016 Through - hole; 3113 Box body; 3115 Pipe cover plate;

[0053] 3117 Inner edge; 3119 Partition; 501 Micro - cooler; 505 Branch water channel;

[0054] 405 Main water channel; 601 Furnace shell; 602 Cooling wall; 603 Annular groove;

[0055] 605 Sealing structure; 5011 Micro - support layer; 5013 Micro - heat - exchange layer;

[0056] 5015 Micro - cooling channel; 5101 Micro - inlet pipe; 5102 Micro - outlet pipe;

[0057] 511 Miniature pipeline protection tube. Specific implementation manners

[0058] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0059] In the following detailed description, reference may be made to the accompanying drawings that form a part hereof, and in which are shown by way of illustration specific embodiments in which the application may be practiced. In the drawings, like reference numerals describe substantially similar components in different views. The various specific embodiments of the present application have been described in sufficient detail below to enable those of ordinary skill in the art with relevant knowledge and technology to implement the technical solutions of the present application. It should be understood that other embodiments may be utilized or structural, logical or electrical changes may be made to the embodiments of the present application.

[0060] Traditional cooling stave is made of cast iron material, but its service life is short, usually unable to reach the designed service life, and needs to be replaced frequently. With the development of technology, the composite cooling stave, as a new type of cooling stave technology, has gradually received wide attention. When replacing the cast iron cooling stave, using a high-performance composite cooling stave can reduce the number of repairs and significantly reduce the manufacturing cost, operation cost and maintenance cost.

[0061] The copper-steel composite cooling stave is made by compounding copper and steel, and has both the high thermal conductivity of copper and the strength and corrosion resistance of steel, and can operate stably for a long time in a high-temperature environment. Compared with the traditional cast iron cooling stave, the composite cooling stave has higher thermal efficiency, longer service life and lower maintenance cost.

[0062] However, new technical problems also need to be considered: there are differences in the 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, furnace 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 joints of different inclination angles of the furnace shell, the differences in size and structure faced when replacing with high-performance composite cooling staves are greater. Once high-temperature gas in the blast furnace leaks due to structural mismatch, it will have an adverse impact on production efficiency, product quality, equipment life and safety production, etc.

[0063] When attempting to replace cast iron cooling stave with composite cooling stave, since a thinner composite cooling stave can achieve the same cooling performance as the original cast iron cooling stave, technical problems such as the mismatch between the structural dimensions of the cooling stave and the original design dimensions of the cast iron cooling stave, and the difficulty in positioning the cooling stave will occur. This often requires changing the opening size and position of the furnace shell, which not only increases the construction difficulty but also may lead to a reduction in the strength of the furnace shell, affecting the safe operation of the blast furnace. Once high-temperature gas in the blast furnace leaks through the gap between the thin wall and the original furnace shell due to structural mismatch, it will have an adverse impact on production efficiency, product quality, equipment life, and safety production. At the same time, there are also problems of insufficient cooling efficiency and aggravated thermal stress concentration in the corner areas of the replaced high-performance cooling stave.

[0064] For this reason, the present invention proposes a new type of thin-wall cooling stave structure, which not only solves the adaptation problem of replacing cast iron cooling stave with composite cooling stave, but also realizes the efficient cooling and sealing strengthening of the thin-wall cooling stave while maintaining the lightweight advantage of the thin-wall cooling stave through the collaborative design of the composite frame structure and the micro cooler design, and can meet the above problems of replacing cast iron cooling stave with composite cooling stave.

[0065] The thick-wall cooling stave (the first cooling stave) referred to in this solution is the cast iron cooling stave used at the beginning of the blast furnace design, with a thick size; the thin-wall cooling stave (the second cooling stave) is a copper cooling stave or a composite cooling stave with the same cooling performance as the cast iron cooling stave, with a thin 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-wall cooling stave, with a size smaller than that of the thin-wall cooling stave, and is used to replace the frame structure and improve the cooling performance of the cooling stave at the same time.

[0066] The exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0067] Figure 1 A schematic diagram showing a thin-wall cooling stave according to an exemplary embodiment is shown.

[0068] Figure 2 An exploded view showing a thin-wall cooling stave according to an exemplary embodiment is shown.

[0069] According to an exemplary embodiment, refer to Figure 1 , the thin-wall cooling stave for blast furnace includes a heat exchange layer 101, a support layer 201, a frame structure 301, an inlet pipe 401, and an outlet pipe 403. The frame structure 301 also has a pipe protection tube 311 that can pass through the inlet pipe 401 and the outlet pipe 403.

[0070] The heat exchange layer 101 is configured to conduct out the heat transferred by the blast furnace, and the support layer 201 is compositely arranged outside the heat exchange layer 101 near the furnace shell side, and is configured to increase the strength of the heat exchange layer 101.

[0071] Refer to Figure 2, at least one support rib 3015 is arranged on the periphery of the pipeline protection tube 311 and is connected to the frame structure 301. One or more channels 1012 of the thin-walled cooling stave for blast furnace are arranged between the heat exchange layer 101 and the support layer 201. The channels 1012 are configured to accommodate cooling water to pass through. The water inlet pipe 401 and the water outlet pipe 403 are connected to the channels 1012.

[0072] The frame structure 301 is compositely arranged on the side of the support layer 201 close to the blast furnace shell. It is configured to increase the thickness of the thin-walled cooling stave to replace the thick-walled cooling stave. The frame structure 301 has a contour adapted to the external dimensions of the support layer 201 and is a hollow quadrilateral frame surrounded by the first to fourth side ribs.

[0073] Grid support ribs 3015 are arranged on the inner wall of the frame structure 301, and one or more through holes 3016 are provided on the inner wall of the support ribs 3015.

[0074] The frame structure of this embodiment adopts a hollow structure design, which reduces the weight while maintaining good strength, facilitating the improvement of the cooling efficiency. Steel grid support ribs and through holes are arranged on the inner wall of the frame structure, further enhancing the strength and rigidity of the frame structure, ensuring the stability of the overall structure, and at the same time enabling the slurry to flow, which is beneficial to the grouting process of the cooling stave.

[0075] The frame structure of this exemplary embodiment is compositely arranged on the side of the support layer close to the blast furnace shell, increasing the thickness of the thin-walled cooling stave, ensuring the external dimensions of the original working surface, and can effectively replace the thick-walled cooling stave to achieve in-situ installation.

[0076] According to some embodiments, the thin-walled cooling stave further includes a wear-resistant layer 1011, which is compositely arranged inside the heat exchange layer 101 close to the furnace cavity side and is configured to reduce the wear of the heat exchange layer. The material of the heat exchange layer 101 is selected from copper, and the materials of the support layer 201 and the wear-resistant layer 1011 are selected from 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 explosive welding.

[0077] According to some embodiments, the thick-walled cooling stave is a cuboid or a special-shaped body, and the thickness L3 at each position of the frame structure 301 satisfies:

[0078] L3 = the thickness L of the corresponding position of the original thick-walled cooling stave - (the thickness L1 of the heat exchange layer + the thickness L2 of the support layer).

[0079] Figure 3 Schematic diagram showing a thin-walled cooling stave according to another exemplary embodiment.

[0080] According to an exemplary embodiment, the frame structure 301 has a profile adapted to the outer dimensions of the support layer and is a hollow quadrilateral frame surrounded by the first to fourth side ribs 3011 to 3014. 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 is / are a micro cooler.

[0081] Figure 4A , 4B Schematic diagrams showing a single-side rib micro cooler of a thin-wall cooler and a pipeline protection tube according to another exemplary embodiment.

[0082] See Figure 4B , the micro cooler 501 includes a micro heat exchange layer 5013, a micro support layer 5011, and a micro cooling channel 5015. The micro support layer 5011 is disposed inside the micro heat exchange layer 5013. The micro cooling channel 5015 is disposed between the micro heat exchange layer 5013 and the micro support layer 5011 and is configured to accommodate cooling water passing through. The micro cooling channel 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 disposed along the inside of the micro cooler 501 and are spaced apart by a preset distance. The micro cooling channel 5015 is provided as a main water channel opened in the circumferential direction around the single side rib.

[0083] According to some embodiments, see Figure 4A , the micro water inlet pipe 5101 and the micro water outlet pipe 5102 share a pipeline protection tube box 3113 with the water inlet pipe 401 and the water outlet pipe 403.

[0084] Figure 5A Schematic diagram showing a surrounding water channel of a micro cooler according to an exemplary embodiment.

[0085] 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 is / are a micro cooler. The micro cooling channel 5015 includes a main water channel opened in the circumferential direction around each micro cooler. According to Figure 5A as shown, the fourth side rib 3014 is a micro cooler. 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 coolers on the second side rib 3012 and the fourth side rib 3014. According to another embodiment, the first to fourth side ribs 3011 to 3014 of the frame structure are micro coolers. The micro cooling channel 5015 includes a main water channel opened in the circumferential direction around the micro coolers.

[0086] As shown in Figure 5B , at the water channel bend position of the micro cooling channel 5015, a branch water channel 505 connected to the water channel of the micro cooling channel is provided. The branch water channel 505 is arranged at a certain angle with the main water channel 405, and the angle is greater than or equal to 10°. The circumferentially arranged micro cooler has good cooling uniformity. The branch water channel of the micro cooler eliminates the corner hot spots, and the thermal stress is reduced by ≥40%.

[0087] The pipe protection tube 311 can be arranged in various ways. As shown in Figure 2 , the pipe protection tube 311 is arranged as a hollow tube that can accommodate the inlet pipe and the outlet pipe to pass through.

[0088] Furthermore, as shown in Figure 6A , Figure 6B , the pipe protection tube 311 includes a hollow stepped tube with a boss. The hollow stepped tube is used to pass through the inlet pipe 401 or the outlet pipe 403 of the thin-walled cooling wall. The large-diameter side of the hollow stepped tube is fixedly connected to the thin-walled cooling wall 602, and the other large-diameter side is in close contact with the outer wall of the opening of the furnace shell 601. The small-diameter of the hollow stepped tube can pass through the opening of the furnace shell and has a certain gap with the inner wall of the furnace shell opening. An annular groove 603 is opened on the inner wall of the large-diameter of the hollow stepped tube close to the circumferential direction of the furnace shell opening. The inner radius of the annular groove 603 is the same as the radius of the small-diameter of the hollow stepped tube.

[0089] Referring to Figure 6B , the thin-walled cooling wall further includes a sealing structure 605. The sealing structure 605 is arranged on the boss of the hollow stepped tube, and the sealing structure 605 is made of an elastic material.

[0090] According to some embodiments, for the thin-walled cooling wall with a pipe protection tube, the outer wall of the small-diameter of the hollow stepped tube is provided with threads.

[0091] As shown in Figure 2 ,

[0092] As shown in Figure 2 , further, a pipe cover plate 3115 is arranged in the box body of the pipe protection tube 311. The pipe cover plate 3115 is provided with a plurality of holes allowing the inlet pipe and the outlet pipe to pass through. The pipe cover plate 3115 is slidably arranged inside the box body 3113, and the box body 3113 also has an inner edge 3117 to prevent the pipe cover plate from sliding out.

[0093] It should be understood that the pipeline protection tube structure can be selected from the above most suitable structures according to actual needs.

[0094] According to Figure 5A As shown, a micro pipeline protection tube 511 is further provided on the frame structure. The micro water inlet pipeline 5101 and the micro water outlet pipeline 5102 share a micro pipeline protection tube 511. The micro pipeline protection tube structure can be selected from one of the above pipeline protection tube structures according to actual situations.

[0095] The structural design of the pipeline protection tube in this exemplary embodiment is reasonable, which can effectively protect the water inlet pipeline and the water outlet pipeline, extend the service life. The modular protection tube structure can protect the inlet and outlet pipelines without changing the opening position and size of the pipeline, facilitating the precise positioning of the cooling stave.

[0096] By setting the step positioning protection tube and the rubber ring, it can be combined and tightly attached to the inner wall of the furnace shell, providing a small deformation range, preventing the deformation of the cooling stave, and at the same time improving the sealing performance between the slurry and the blast furnace shell, preventing the leakage of high-temperature gas in the furnace, and effectively improving the safety performance.

[0097] The present invention also proposes a manufacturing method for a thin-wall cooling stave that can replace the thick-wall cooling stave of a blast furnace. The specification size of the thin-wall cooling stave that meets the cooling performance is obtained by simulating and calculating based on the cooling performance and specification size of the thick-wall cooling stave.

[0098] Figure 7 The flowchart of the manufacturing method of the thin-wall cooling stave according to the exemplary embodiment is shown.

[0099] Refer to Figure 7 , in S101, determine the specification parameters of the thin-wall cooling stave.

[0100] According to the exemplary embodiment, the specification size of the thin-wall cooling stave that meets the cooling performance is obtained by simulating and calculating based on the cooling performance and specification size of the thick-wall cooling stave. Among them, according to the heat load distribution of the original thick-wall cooling stave, the thickness of the heat exchange layer L1 is calculated by computer simulation 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 L2 is determined.

[0101] Based on the thickness L of the original thick-wall cooling stave, calculate the thickness L3 of the frame structure, satisfying: L3 = L - (L1 + L2), and ensure that the outer contour of the frame structure is adapted to the installation interface of the original thick-wall cooling stave.

[0102] In S103, construct the composite structure of the thin-wall cooling stave.

[0103] 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 channels. A frame structure is welded outside 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.

[0104] In S105, cooling water channels and pipes are arranged.

[0105] According to exemplary embodiments, the positions of the water inlet pipe and the water outlet pipe of the thin-walled cooling wall are set according to the positions of the water inlet pipe and the water outlet pipe of the original thick-walled cooling wall. A straight or curved water channel is arranged in the thin-walled cooling wall. Pipe protectors are arranged at corresponding positions of the frame structure according to the positions of the original water inlet pipe and the water outlet pipe. The water inlet pipe and the water outlet pipe pass through the pipe protectors, and the pipe protectors are connected to the frame structure through at least one support rib.

[0106] 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. The micro-coolers are fixedly connected to the support 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.

[0107] The thin-walled cooling wall for blast furnace and the manufacturing method thereof proposed by the present invention reduce the weight of the cooling wall in terms of material and enhance the stability of the cooling wall in terms of structure compared with the traditional cast iron cooling wall, improve the performance of the cooling wall, and greatly improve the various operation indexes and economic indexes of the blast furnace.

[0108] When the thin-walled cooling wall of the present invention is used to replace the thick cast iron cooling wall, the pipe opening position is the pipe opening position of the original cast iron cooling wall. The steel structure added without changing the original furnace shell opening can not only ensure the external dimensions of the original working surface, but also enhance the structural strength of the thin-walled cooling wall.

[0109] Those skilled in the art can clearly understand that the "units" and "modules" in this specification refer to devices and / or components that can independently complete or cooperate with other components to complete specific functions.

[0110] It should be noted that for the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, 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 essential to the present invention.

[0111] In the above embodiments, the descriptions of the respective embodiments have their own focuses. For parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0112] In 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 merely illustrative. For example, the division of units is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system.

[0113] In the above embodiments, the descriptions of the respective embodiments have their own focuses. For parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0114] The above specifically shows and describes the exemplary embodiments of the present invention. It should be understood that the present invention is not limited to the detailed structures, setting methods or implementation methods described herein; on the contrary, the present invention is intended to cover various modifications and equivalent settings included within the spirit and scope of the appended claims.

Claims

1. A thin-walled cooling stave for blast furnace, comprising: A heat exchange layer configured to conduct the heat transferred by the blast furnace; A support layer compositely provided on the side of the heat exchange layer away from the inside of the blast furnace, configured to increase the strength of the heat exchange layer; and one or more channels provided between the heat exchange layer and the support layer, occupying part of the heat exchange layer and part of the support layer, configured to allow cooling water to pass through; characterized in that: further comprising a frame structure compositely provided on the side of the support layer away from the inside of the blast furnace, configured to increase the thickness of the thin-wall cooling stave to replace the thick-wall cooling stave; the frame structure has a contour adapted to the external dimensions of the support layer, and is a hollow quadrilateral frame surrounded by first to fourth side ribs; further comprising an inlet pipe and an outlet pipe, the inlet pipe and the outlet pipe are connected to the channels, and the frame structure is further provided with pipe sleeves through which the inlet pipe and the outlet pipe pass, and at least one support rib is provided around the periphery of the pipe sleeve and connected to the frame structure; 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, the micro cooler includes a micro heat exchange layer, a micro support layer and a micro cooling channel, the micro support layer is provided inside the micro heat exchange layer, the micro cooling channel is provided between the micro heat exchange layer and the micro support layer, and is configured to allow cooling water to pass through, the micro cooling channel is connected to a micro inlet pipe and a micro outlet pipe, the micro inlet pipe and the micro outlet pipe are provided along the inner side of the micro cooler and are spaced apart by a preset distance, and the micro cooling channel includes a main water channel opened in the circumferential direction around each micro cooler; the thickness L3 at each position of the frame structure satisfies: L3 = the thickness L of the corresponding position of the original thick-wall cooling stave - (the thickness L1 of the heat exchange layer + the thickness L2 of the support layer).

2. A thin-wall cooling stave for blast furnace, comprising: A heat exchange layer configured to conduct the heat transferred by the blast furnace; A support layer, which is compositely arranged on the side of the heat exchange layer away from the inside of the blast furnace, and is configured to increase the strength of the heat exchange layer; and one or more channels, 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 further includes a frame structure, which is compositely arranged on the side of the support layer away from the inside of the blast furnace, and is configured to increase the thickness of the thin-wall cooling stave to replace the thick-wall cooling stave; the frame structure has a contour adapted to the outer dimension of the support layer, and is surrounded by the first to fourth side ribs to form a hollow quadrilateral frame; it further includes an inlet pipe and an outlet pipe, the inlet pipe and the outlet pipe are connected to the channels, and the frame structure is also provided with a pipe casing through which the inlet pipe and the outlet pipe pass, and at least one support rib is arranged around the pipe casing and connected to the frame structure; 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 channel. The micro-support layer is arranged inside the micro-heat exchange layer, and the micro-cooling channel is arranged between the micro-heat exchange layer and the micro-support layer, and is configured to accommodate the passage of cooling water. The micro-cooling channel is connected to a micro-inlet pipe and a micro-outlet pipe. The micro-inlet pipe and the micro-outlet pipe are arranged along the inner side of the micro-cooler and are separated by a preset distance. The micro-cooling channel includes a main water channel opened along the circumferential direction of the micro-cooler; the thickness L3 of each position of the frame structure satisfies: L3 = the thickness L of the corresponding position of the original thick-wall cooling stave - (the thickness L1 of the heat exchange layer + the thickness L2 of the support layer).

3. The thin-walled cooling stave according to claim 1 or 2, characterized in that: At the corner position of the main water channel of the micro-cooling channel, a branch water channel connected to the main water channel of the micro-cooling channel is arranged, and the branch water channel is arranged at an angle with the main water channel, and the angle is greater than or equal to 10°.

4. The thin-walled cooling stave according to claim 1 or 2, characterized in that: The pipe casing includes a hollow stepped pipe with a boss, and the hollow stepped pipe is used to pass through the inlet pipe and the outlet pipe of the thin-wall cooling stave; the large-diameter side of the hollow stepped pipe is fixedly connected to the thin-wall cooling stave, and the other large-diameter side is in close contact with the outer wall of the opening of the furnace shell; the small-diameter of the hollow stepped pipe can pass through the opening of the blast furnace shell and has a certain distance from the inner wall of the opening of the blast furnace shell; an annular groove is opened on the inner wall of the large-diameter of the hollow stepped pipe close to the circumferential direction of the furnace shell opening, and the inner radius of the annular groove is the same as the radius of the small-diameter of the hollow stepped pipe.

5. The thin-walled cooling stave according to claim 4, wherein: It further includes a sealing structure, and the sealing structure is arranged on the boss of the hollow stepped pipe, and the sealing structure uses an elastic material.

6. The thin-wall cooling stave according to claim 4, characterized in that: The outer wall of the small-diameter of the hollow stepped pipe is provided with threads.

7. The thin-wall cooling stave according to claim 1 or 2, characterized in that: The pipe casing structure is constructed as a box body capable of passing through a plurality of inlet pipes and outlet pipes. A partition for separating the inlet pipes and outlet pipes is arranged inside the box body, and the partition is fixedly connected to the inner wall of the box body.

8. The thin-walled cooling stave according to claim 7, wherein: A pipe cover plate is arranged inside the box body. The pipe cover plate is provided with a plurality of holes allowing the inlet pipes and outlet pipes to pass through. The pipe cover plate is slidably arranged inside the box body, and the box body also has an inner edge for preventing the pipe cover plate from sliding out.

9. The thin-walled cooling stave according to claim 1 or 2, characterized in that: A micro-pipe protection tube is also provided on the frame structure, and the micro water inlet pipe and the micro water outlet pipe share a micro-pipe protection tube.

10. The thin-wall cooling stave according to claim 1 or 2, characterized in that: The micro water inlet pipe, the micro water outlet pipe share a pipe protection tube with the water inlet pipe and the water outlet pipe.

11. The thin-wall cooling stave according to any one of claims 1-2, 5-6, and 8, characterized in that: Grid support ribs are provided on the inner wall of the frame structure, and one or more through holes are provided on the inner wall of the support ribs.

12. The thin-walled cooling stave according to any one of claims 1-2, 5-6, and 8, characterized in that: It also includes a wear-resistant layer, which is compositely provided on the side close to the furnace cavity in the heat exchange layer, and is configured to reduce the wear of the heat exchange layer.

13. The thin-wall cooling stave according to claim 12, wherein: The material of the heat exchange layer is selected from copper, and the materials of the support layer and the wear-resistant layer 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 explosive welding.

14. A manufacturing method of a thin-wall cooling stave that can replace a thick-wall cooling stave of a blast furnace, using the thin-wall cooling stave according to any one of claims 1-13, characterized in that: (1) Determine the specification parameters of the thin-wall cooling stave According to the cooling performance and specification size of the thick-wall cooling stave, the specification size of the thin-wall cooling stave that meets the cooling performance is obtained by simulation calculation. Among them, according to the heat load distribution of the original thick-wall cooling stave, the thickness of the heat exchange layer is calculated as L1 through computer simulation, 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 as L2; 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 it is ensured that the outer contour of the frame structure is adapted to the installation interface of the original thick-wall cooling stave; (2) Construct the composite structure of the thin-wall cooling stave The heat exchange layer and the support layer are composited by explosive welding to form a thin-wall main body with a cavity. A frame structure is welded on the outside of the support layer. The frame structure is a hollow quadrilateral surrounded by the first to fourth side ribs, and the thickness of the side ribs is L3; (3) Arrange the cooling water channels and pipes. Set the positions of the water inlet pipe and the water outlet pipe of the thin-wall cooling stave according to the positions of the water inlet pipe and the water outlet pipe of the original thick-wall cooling stave. A straight or curved water channel is provided in the thin-wall cooling stave; According to the positions of the original water inlet pipe and the water outlet pipe, pipe protection tubes are provided at corresponding positions of the frame structure. The water inlet pipe and the water outlet pipe pass through the pipe protection tubes, and the pipe protection tubes are connected to the frame structure through at least one support rib.

15. The manufacturing method according to claim 14, further comprising: According to the heat load simulation, set 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 as a micro cooler, and the micro cooler is fixedly connected to the support layer of the thin-wall 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.

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