Cooling wall structure applied to hydrogen-rich blast furnace

Abstract

The utility model discloses a cooling wall structure applied to a hydrogen-rich blast furnace, relates to the technical field of hydrogen-rich blast furnace structures, and aims to solve the problem that the existing cooling wall design cannot meet the requirements of the hydrogen-rich blast furnace. A plurality of cooling water pipelines which are arranged in parallel are arranged in a cooling wall body in a penetrating manner; two ends of each cooling water pipeline respectively penetrate out from the upper part and the lower part of the cooling wall body far away from the cold surface side in the blast furnace; the hydrogen-rich gas conveying pipeline vertically penetrates through the cooling wall body and the blast furnace lining material, and one end close to the interior of the blast furnace extends out of the wall surface of the blast furnace lining material; the periphery of the hydrogen-rich gas conveying pipeline is fixedly sleeved with a cooling sleeve, the end, close to the interior of the blast furnace, of the cooling sleeve is buried in the blast furnace lining material, and a water inlet and a water outlet of the cooling sleeve are formed in the outer side of the cold face. The cooling efficiency of the cooling wall of the hydrogen-rich blast furnace can be guaranteed, and meanwhile a better hydrogen-rich gas conveying mode is provided.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen-rich blast furnace structures, and specifically to a stave structure applied to a hydrogen-rich blast furnace. Background Art

[0002] Hydrogen enrichment in blast furnaces will be the mainstream direction in stages. However, there are few dedicated designs for hydrogen-rich blast furnaces in the prior art, and the increase in hydrogen gas pipelines has indeed brought new changes. It is urgent to meet the new needs of hydrogen-rich blast furnaces.

[0003] The stave is an important part of the blast furnace. The stave mainly consists of a wall body and internal pipelines. It conducts the heat in the blast furnace lining to the outside through the internal cooling water pipelines, so that the blast furnace lining material is always in a suitable temperature range to ensure the stable operation of the blast furnace; for the stave of a hydrogen-rich blast furnace, on the basis of ensuring the efficient cooling function of the stave, it is necessary to design the structural cooperation between the hydrogen-rich gas pipeline and the stave. Therefore, there is an urgent need for a stave structure applied to a hydrogen-rich blast furnace to solve this problem. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a stave structure applied to a hydrogen-rich blast furnace to solve the problem that the existing stave design cannot meet the needs of a hydrogen-rich blast furnace.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A stave structure applied to a hydrogen-rich blast furnace includes a stave body and a hydrogen-rich gas delivery pipeline. One side of the stave body facing the inside of the blast furnace is provided with a dovetail groove and is connected with blast furnace lining material. Multiple parallel cooling water pipelines are arranged through the inside of the stave body, and both ends of each cooling water pipeline penetrate out from the upper and lower parts of the cold surface side of the stave body away from the inside of the blast furnace; the hydrogen-rich gas delivery pipeline vertically penetrates through the stave body and the blast furnace lining material, and one end close to the inside of the blast furnace extends out of the wall surface of the blast furnace lining material.

[0006] A cooling sleeve is fixedly sleeved on the outer periphery of the hydrogen-rich gas delivery pipeline. One end of the cooling sleeve close to the inside of the blast furnace is buried in the blast furnace lining material. The water inlet and outlet of the cooling sleeve are both arranged on the outside of the cold surface. Cooling water enters the cooling sleeve from the water inlet along the outer periphery of the hydrogen-rich gas delivery pipeline, flows through the end close to the inside of the blast furnace and then returns to the water outlet along another path to complete the cycle.

[0007] Preferably, the end face of the hydrogen-rich gas delivery pipeline close to the inside of the blast furnace gradually approaches the blast furnace central axis from the lower end to the upper end.

[0008] Preferably, the hydrogen-rich gas delivery pipeline passes through the central position of the dovetail groove and is arranged in the middle of the stave body.

[0009] Preferably, one end of the hydrogen-rich gas transmission pipeline close to the inside of the blast furnace extends 50 mm to 100 mm out of the wall surface of the blast furnace lining material.

[0010] Preferably, the inner diameter of the hydrogen-rich gas transmission pipeline is 20 mm to 100 mm.

[0011] Preferably, the center line in the middle of the cooling water pipeline coincides with the center line of the vertical section of the cooling stave body.

[0012] Preferably, the hydrogen-rich gas transmission pipeline is made of hydrogen embrittlement-proof material or has a hydrogen-blocking coating on the inner wall.

[0013] More preferably, the inner wall of the hydrogen-rich gas transmission pipeline is coated with a hydrogen-blocking coating. The part of the hydrogen-rich gas transmission pipeline in the blast furnace lining material and the cooling stave body is made of a heat-conducting metal material, and the part close to the inside of the blast furnace is made of a wear-resistant and high-temperature-resistant metal material. The two materials are welded together.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] The cooling stave structure applied to the hydrogen-rich blast furnace has small changes in transformation on the basis of the original cooling stave, with a simple and reasonable structure, easy design and processing, little influence on the cooling efficiency of the cooling stave, improved hydrogen-rich gas transmission mode, and more able to ensure that the gas transmission meets the design requirements, indirectly contributing to improving the production efficiency of the blast furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the present utility model;

[0017] Figure 2 is a schematic cross-sectional structural diagram of the hydrogen transmission pipeline of the present utility model.

[0018] In the figure: 1, cooling stave body; 11, cold surface; 12, hot surface; 13, dovetail groove; 2, cooling water pipeline; 3, hydrogen-rich gas transmission pipeline; 31, cooling sleeve; 4, blast furnace lining material. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] A cooling stave structure applied to a hydrogen-rich blast furnace comprises a cooling stave body 1 and a hydrogen-rich gas delivery pipeline 3. A dovetail groove 13 is provided on one side of the cooling stave body 1 facing the inside of the blast furnace and connected to a blast furnace lining material 4. A plurality of parallel cooling water pipelines 2 are penetrated inside the cooling stave body 1. The two ends of each cooling water pipeline 2 respectively pass through the upper part and the lower part of the cooling stave body 1 on the side of a cold surface 11 away from the inside of the blast furnace. The hydrogen-rich gas delivery pipeline 3 vertically passes through the cooling stave body 1 and the blast furnace lining material 4. The end thereof close to the inside of the blast furnace slightly protrudes from the wall surface of the blast furnace lining material 4. For reference, the length away from the wall surface is preferably 50 mm to 100 mm. In addition, the inlet section of the hydrogen-rich gas delivery pipeline 3 can be arranged in parallel with the inlet and outlet sections at both ends of the cooling water pipeline 2.

[0020] In order to prevent the high temperature inside the blast furnace from affecting the strength and life of the hydrogen-rich gas delivery pipeline 3, a cooling sleeve 31 is fixedly sleeved on the outer periphery of the hydrogen-rich gas delivery pipeline 3. The end of the cooling sleeve 31 close to the inside of the blast furnace is buried in the blast furnace lining material 4. The inlet and outlet of the cooling sleeve 31 are both arranged on the outside of the cold surface 11. The cooling water enters the cooling sleeve 31 from the water inlet along the outer periphery of the hydrogen-rich gas delivery pipeline 3, flows through the end close to the inside of the blast furnace, and then returns to the water outlet along another path to complete the circulation. The circulating water supply speed is adjusted according to the actual situation, with the temperature of the hydrogen-rich gas delivery pipeline 3 being maintained within a range that meets the material strength requirements as a benchmark. For reference, the cooling sleeve 31 can be a common spiral structure water inlet and a spiral structure water outlet, and the two sets of spiral structures are arranged in parallel, or it can be a spiral structure water inlet and a straight pipe water outlet, or a double helix structure can be used. The specific form of the heat exchange tube is the existing technology, so it will not be repeated here.

[0021] Since there is an upward high-temperature airflow inside the blast furnace, which triggers a complex flow of ore, coke particles and dust inside the blast furnace, in order to prevent the falling particles from agglomerating and agglomerating at the airflow outlet, causing the hydrogen delivery pipeline 3 to be blocked, the gas outlet end is designed to be slightly longer at the top and slightly shorter at the bottom (relative to the height direction of the blast furnace), as shown in the following figure. Figure 1 and 2 As shown, the end surface of the hydrogen-rich gas delivery pipeline 3 close to the interior of the blast furnace gradually approaches the central axis of the blast furnace from the lower end to the upper end.

[0022] The hydrogen-rich gas delivery pipeline 3 passes through the center of the dovetail groove 13 and is arranged in the middle of the cooling wall body 1. In this way, the overall rigidity of the cooling wall body 1 can be guaranteed to the maximum extent without affecting the heat dissipation efficiency of the cooling water pipeline 2, and possible stress concentration can be avoided to damage the cooling wall body 1. In addition, the inner diameter of the hydrogen-rich gas delivery pipeline 3 is usually 20 mm to 100 mm, which can also be adjusted according to actual needs and blast furnace conditions.

[0023] The center line in the middle of the general cooling water pipe 2 coincides with the center line of the vertical section of the cooling wall body 1, which is more conducive to uniform heat conduction.

[0024] To prevent the "hydrogen embrittlement" phenomenon in metal pipes, the hydrogen-rich gas transmission pipe 3 is made of hydrogen embrittlement-proof materials, such as GH903 alloy, X70 steel, X80 steel, or a hydrogen-blocking coating is applied to the inner wall of the hydrogen-rich gas transmission pipe 3, including: oxide coatings such as chromium oxide and zirconium oxide; silicide coatings such as silicon carbide and silicon nitride; titanium compound coatings such as titanium nitride and titanium carbide; aluminide coatings such as iron-aluminum alloy; common coating preparation processes include chemical vapor deposition, plasma spraying, pack cementation aluminizing, sol-gel method, micro-arc oxidation, etc.; when the inner wall of the hydrogen-rich gas transmission pipe 3 is coated with a hydrogen-blocking coating, it is further preferable to use different pipe materials in different sections. For reference, considering the erosion effect of the high-speed gas flow with particles and dust on the metal and the temperature requirements of the hydrogen transmission pipe 3, the part of the hydrogen-rich gas transmission pipe 3 in the blast furnace lining material 4 and the cooling wall body 1 uses heat-conducting metal materials, such as copper, cast steel, cast iron, etc., and a wear-resistant and high-temperature-resistant metal material is used at one end close to the inside of the blast furnace. The two materials are welded together.

[0025] In addition, the manufacturing materials of the cooling wall body 1 include, but are not limited to, materials such as copper, cast steel, cast iron, etc., and different materials can also be used on the cold surface 11 and the hot surface 12 sides respectively, and are composite-molded by welding.

[0026] The above are only the preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope defined by the claims.

[0027] Details not described in the present invention are all well-known technologies to those skilled in the art.

Claims

1. A stave structure applied to a hydrogen-rich blast furnace, characterized in that: It includes a cooling stave body (1) and a hydrogen-rich gas delivery pipe (3). On one side of the cooling stave body (1) facing the inside of the blast furnace, a dovetail groove (13) is provided and connected with blast furnace lining material (4). A plurality of parallel cooling water pipes (2) are arranged through the inside of the cooling stave body (1). Both ends of each cooling water pipe (2) penetrate out from the upper and lower parts of the cold surface (11) side of the cooling stave body (1) away from the inside of the blast furnace; the hydrogen-rich gas delivery pipe (3) vertically penetrates through the cooling stave body (1) and the blast furnace lining material (4), and one end thereof close to the inside of the blast furnace extends out of the wall surface of the blast furnace lining material (4). A cooling sleeve (31) is fixedly sleeved on the outer periphery of the hydrogen-rich gas delivery pipe (3). One end of the cooling sleeve (31) close to the inside of the blast furnace is buried inside the blast furnace lining material (4). The inlet and outlet of the cooling sleeve (31) are both arranged outside the cold surface (11). Cooling water enters the cooling sleeve (31) from the inlet along the outer periphery of the hydrogen-rich gas delivery pipe (3), flows through the end close to the inside of the blast furnace and then returns to the outlet along another path to complete the cycle.

2. The cooling stave structure applied to a hydrogen-rich blast furnace according to claim 1, wherein: The end face of the hydrogen-rich gas delivery pipe (3) close to the inside of the blast furnace gradually approaches the central axis of the blast furnace from the lower end to the upper end.

3. The cooling stave structure applied to a hydrogen-rich blast furnace according to claim 1, characterized in that: The hydrogen-rich gas delivery pipe (3) passes through the central position of the groove of the dovetail groove (13) and is arranged at the middle part of the cooling stave body (1).

4. The cooling stave structure applied to a hydrogen-rich blast furnace according to claim 1, characterized in that: One end of the hydrogen-rich gas delivery pipe (3) close to the inside of the blast furnace extends out of the wall surface of the blast furnace lining material (4) by 50 mm to 100 mm.

5. The cooling stave structure applied to a hydrogen-rich blast furnace according to claim 1, characterized in that: The inner diameter of the hydrogen-rich gas delivery pipe (3) is 20 mm to 100 mm.

6. The cooling stave structure applied to a hydrogen-rich blast furnace according to claim 1, characterized in that: The center line of the middle part of the cooling water pipe (2) coincides with the center line of the vertical section of the cooling stave body (1).

7. The cooling stave structure applied to a hydrogen-rich blast furnace according to claim 1, characterized in that: The hydrogen-rich gas delivery pipe (3) is made of a hydrogen embrittlement-proof material or an inner wall hydrogen-blocking coating.

8. The cooling stave structure applied to a hydrogen-rich blast furnace according to claim 7, characterized in that: The inner wall of the hydrogen-rich gas delivery pipe (3) is coated with a hydrogen-blocking coating. The part of the hydrogen-rich gas delivery pipe (3) in the blast furnace lining material (4) and the cooling stave body (1) uses a heat-conducting metal material, and the end close to the inside of the blast furnace uses a wear-resistant and high-temperature-resistant metal material. The two materials are welded and connected.

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