A method for repairing blind area of movable smoke hood of converter disc

Abstract

The present application relates to a kind of converter disc type movable smoke hood blind area leak repair method, belong to converter waste heat system equipment maintenance technical field.It includes the following steps: step one: clean the cold steel adhered to the surface of movable smoke hood water leakage section, determine the position of the two ends of movable smoke hood water leakage section;Step two: close the water supply circulating system of movable smoke hood, drain through water connection box import and water connection box export, and cut the outside observation port and inside observation port at the two ends of water leakage section respectively;Step three: form the top cutting zone of blind area end;Step four: clean the steel slag in the cooling water pipe of water leakage section, weld outer round steel and inner round steel, and weld seal the end of blind area, and blind area forms airtight space;Step five: weld seal inside observation port and outside observation port and test water.The present application achieves the effect of blind area leak repair by establishing airtight space between smoke hood cooling water pipe, which saves time and effort, is convenient and fast, reduces labor intensity and construction difficulty.

Description

Technical Field

[0001] This invention relates to a method for repairing leaks in blind spots of a converter disc-type movable fume hood, belonging to the technical field of converter waste heat system equipment maintenance. Background Technology

[0002] The converter flue hood is a crucial component of the converter flue gas purification and recovery system. Its unique location not only allows for the effective recovery of most of the heat from the converter flue gas but also maintains a slightly positive pressure at the converter inlet, improving the quality and quantity of recovered converter gas. However, due to its harsh operating conditions, subjected to alternating thermal stress, high-temperature oxidation, high-temperature corrosion, and flue gas erosion, its service life is only about one year, with a high accident rate during its lifespan. Frequent occurrences of cooling water pipe bursts and leaks severely impact the economic efficiency and safety of converter steelmaking. Leaks and repairs in the blind spots of the converter flue hood are particularly challenging. Conventional blind spot repair methods involve cutting the leaking section of the cooling water pipe and welding a new section. This method is time-consuming, labor-intensive, requires extensive welding, and demands high welding quality and precision. Furthermore, the small spacing between adjacent cooling water pipes makes it difficult for the welding rod to penetrate, significantly compromising welding quality and precision. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method for repairing blind spots in a converter disc-type movable fume hood, which achieves the effect of repairing blind spots by creating a sealed space between the cooling water pipes of the fume hood. This method is time-saving, labor-saving, convenient and quick, and reduces labor intensity and construction difficulty.

[0004] The technical solution adopted by the present invention to solve the above problems is: a method for repairing blind spots in a converter disc-type movable fume hood, the method comprising the following steps:

[0005] Step 1: Clean the cold steel adhering to the surface of the leaking section of the movable fume hood, and determine the positions of the two ends of the leaking section of the movable fume hood;

[0006] Step 2: Shut down the water circulation system of the movable fume hood, drain water through the water manifold inlet and outlet, and cut the outer observation port and inner observation port at both ends of the leaking section respectively;

[0007] Step 3: Determine the size of the top cutting area at the end of the blind zone based on the diameter of the outer round steel, the diameter of the inner round steel, and the diameter of the cooling water pipe of the movable fume hood. Cut through the cooling water pipe with the cutting torch through the outer observation port to form the top cutting area at the end of the blind zone.

[0008] Step 4: Clean the steel slag inside the leaking section of the cooling water pipe, then weld the outer round steel to the outside of the adjacent cooling water pipe and the inner round steel to the inside of the adjacent cooling water pipe, and weld the end of the blind area to form a sealed space.

[0009] Step 5: Seal the inner and outer observation ports by welding and test with water. After passing the test, apply high-temperature resistant material to the welded area outside the leaking section to form a high-temperature resistant layer.

[0010] The determination of the positions of the two ends of the leaking section in step one is to extend the positions of the two ends of the actual leaking section by 4-6 cm respectively.

[0011] In step two, the outer observation port is located on the upper left of the cooling water pipe, and the inner observation port is located on the upper right of the cooling water pipe.

[0012] Both the outer and inner observation ports in step two are rectangular, and their long sides are arranged parallel to the axis of the cooling water pipe.

[0013] The area of ​​the inner observation port is smaller than the area of ​​the outer observation port.

[0014] In step four, the blind zone at the end of the blind zone is first welded through the inner observation port to fill the welding blind zone of the outer observation port, and then the remaining part of the blind zone at the end of the blind zone is welded through the outer observation port.

[0015] Compared with the prior art, the advantages of the present invention are as follows: a method for repairing blind spots in a converter disc-type movable fume hood does not require the entire leaking section to be cut off and welded with new cooling water pipes, avoiding a series of tedious and technically demanding welding repairs. The repair effect can be achieved simply by excavating and patching to create a sealed space between adjacent cooling water pipes, reducing labor intensity and construction difficulty, making the repair of movable fume hoods quick and convenient, greatly shortening the time for emergency repairs during furnace shutdown, and further improving the economy and safety of converter steelmaking production. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the movable fume hood;

[0017] Figure 2 This is a cross-sectional view of the leaking section at the end of the movable fume hood before the leak was repaired.

[0018] Figure 3 A three-dimensional cross-sectional view of the end of the leaking section of the movable fume hood during leak repair;

[0019] Figure 4 This is a cross-sectional view of the leaking section of the movable fume hood after the leak has been repaired.

[0020] Figure 5 This is a cross-sectional view of the end of the leaking section of the movable fume hood after the leak has been repaired.

[0021] In the diagram: 1 Water header inlet, 2 Water header outlet, 3 Cooling water pipe, 4 Inner round steel, 5 Blind zone, 6 Inner observation port, 7 Outer observation port, 8 Top cutting area at the end of the blind zone, 9 End of the blind zone, 10 Outer round steel, 11 Enclosed space. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] like Figure 1-5 As shown in this embodiment, a method for patching blind spots in a converter disc-type movable fume hood includes the following steps:

[0024] Step 1: Clean the cold steel adhering to the surface of the leaking section of the movable fume hood, and determine the positions of the two ends of the leaking section. The positions of the two ends of the leaking section are determined by extending the actual positions of the two ends of the leaking section by about 5cm each, so as to better cover the leaking point. That is, the space between the two ends is the blind zone 5.

[0025] Step 2: Then shut down the water circulation system of the movable fume hood, release water through the water manifold inlet 1 and water manifold outlet 2, and cut the outer observation port 7 and the inner observation port 6 at both ends of the leaking section.

[0026] Step 3: Determine the size of the top cutting area at the end of the blind zone based on the diameter of the outer round steel 10, the diameter of the inner round steel 4, and the diameter of the cooling water pipe of the movable fume hood. The cutting torch passes through the outer observation port 7 to cut through the cooling water pipe 3, forming the top cutting area 8 at the end of the blind zone, which facilitates the welding and sealing of the end of the blind zone 9.

[0027] Step 4: Clean the steel slag inside the leaking section of the cooling water pipe through the inner observation port 6 and the outer observation port 7. Then, weld the outer round steel 10 arranged along the entire length on the outer side of the adjacent cooling water pipe 3, and weld the inner round steel 4 arranged along the entire length on the inner side of the adjacent cooling water pipe 3. Weld the end of the blind zone 9. The outer round steel 10, inner round steel 4 and the welded end of the blind zone 9 form a sealed space 11 in the blind zone of the leaking section to block the flow of water.

[0028] Step 5: Weld the inner observation port 6 and the outer observation port 7 and test them with water. After passing the test, apply high-temperature resistant material to the welded area outside the leaking section to form a high-temperature resistant layer.

[0029] In step two above, the outer observation port is located on the upper left of the cooling water pipe, and the inner observation port is located on the upper right of the cooling water pipe, so that the weld seam is as far away from the water in the cooling water pipe as possible, in order to avoid water leakage problems caused by welding quality.

[0030] In step two above, both the outer observation port 7 and the inner observation port 6 are rectangular, with their long sides arranged parallel to the axis of the cooling water pipe to minimize contact with the cooling water. Because the outer observation port has a small welding blind zone at the end of the blind area, the inner observation port mainly serves as a repair weld; therefore, the area of ​​the inner observation port 6 is smaller than the area of ​​the outer observation port 7.

[0031] The welding method for the blind zone end in step four above is to first weld the welding blind zone of the outer observation port 7 through the inner observation port 6, and then weld the end of the blind zone through the outer observation port 7.

[0032] It eliminates the need to completely cut off and weld new cooling water pipes to repair the leaking section, avoiding a series of tedious and technically demanding welding repairs. The leak can be repaired simply by excavating and patching to create a sealed space between adjacent cooling water pipes. This reduces labor intensity and construction difficulty, making the repair of leaks in movable fume hoods quick and convenient. It also greatly shortens the time for emergency repairs and further improves the economy and safety of converter steelmaking production.

[0033] In addition to the above embodiments, the present invention also includes other embodiments. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present invention.

Claims

1. A method for patching leaks in blind spots of a converter disc-type movable fume hood, characterized in that: The method includes the following steps: Step 1: Clean the cold steel adhering to the surface of the leaking section of the movable fume hood, and determine the positions of the two ends of the leaking section of the movable fume hood; Step 2: Shut down the water circulation system of the movable fume hood, drain water through the water manifold inlet and outlet, and cut the outer observation port and inner observation port at both ends of the leaking section respectively; Step 3: Determine the size of the top cutting area at the end of the blind zone based on the diameter of the outer round steel, the diameter of the inner round steel, and the diameter of the cooling water pipe of the movable fume hood. Cut through the cooling water pipe with the cutting torch through the outer observation port to form the top cutting area at the end of the blind zone. Step 4: Clean the steel slag inside the leaking section of the cooling water pipe, then weld the outer round steel to the outside of the adjacent cooling water pipe and the inner round steel to the inside of the adjacent cooling water pipe, and weld the end of the blind area to form a sealed space. Step 5: Seal the inner and outer observation ports by welding and test with water. After passing the test, apply high-temperature resistant material to the welded area outside the leaking section to form a high-temperature resistant layer.

2. The method for patching blind spots in a converter disc-type movable fume hood according to claim 1, characterized in that: The determination of the positions of the two ends of the leaking section in step one is to extend the positions of the two ends of the actual leaking section by 4-6 cm respectively.

3. The method for patching blind spots in a converter disc-type movable fume hood according to claim 1, characterized in that: In step two, the outer observation port is located on the upper left of the cooling water pipe, and the inner observation port is located on the upper right of the cooling water pipe.

4. The method for patching blind spots in a converter disc-type movable fume hood according to claim 1, characterized in that: Both the outer and inner observation ports in step two are rectangular, and their long sides are arranged parallel to the axis of the cooling water pipe.

5. The method for patching blind spots in a converter disc-type movable fume hood according to claim 4, characterized in that: The area of ​​the inner observation port is smaller than the area of ​​the outer observation port.

6. The method for repairing blind spots in a converter disc-type movable fume hood according to claim 1, characterized in that: In step four, the blind zone at the end of the blind zone is first welded through the inner observation port to fill the welding blind zone of the outer observation port, and then the remaining part of the blind zone at the end of the blind zone is welded through the outer observation port.

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