A method for implementing the whole belt replacement of blast furnace shell without temporary measures

Abstract

The present application relates to a kind of methods for realizing blast furnace shell whole strip replacement without temporary measures, by the symmetrical dismantling of blast furnace shell whole strip block, installation, replacement furnace shell is sequentially symmetrical construction, the first new furnace shell and the second new furnace shell welding upper and lower circumferential weld, third new furnace shell, fourth new furnace shell, fifth new furnace shell and sixth new furnace shell are first welded vertical weld between the adjacent two new furnace shells of replacement, then weld upper and lower circumferential weld of new furnace shell, until the old furnace shell of whole strip furnace shell dismantling is replaced by new furnace shell, complete blast furnace shell whole strip replacement, the beneficial effects of the present application: without large temporary measures auxiliary construction, speed up the speed of blast furnace shell whole strip replacement, improve work efficiency, shorten replacement time, blast furnace overall size and equipment are not affected, save replacement cost, ensure the safety of replacement operation.

Description

Technical Field

[0001] This invention relates to the field of metallurgical steel structure construction technology, and in particular to a method for replacing the entire blast furnace shell without using temporary measures. Background Technology

[0002] Currently, during the ironmaking process, due to the influence of the production process, the furnace shell of the hearth part of the blast furnace body is easily damaged due to the complex working conditions and high temperature, which ultimately leads to unsafe blast furnace production and necessitates the replacement and maintenance of this part of the blast furnace shell.

[0003] Traditional blast furnace shell replacement often involves replacing the entire shell. To ensure construction quality, replacing a large blast furnace shell requires numerous temporary measures to lift and secure the upper part of the shell to the furnace frame. After replacement, welding is performed in a free state. Once the shell replacement and welding are complete, the temporary measures are removed. Alternatively, the shell and cooling equipment can be completely dismantled from top to bottom and then reassembled. This method requires reinstalling a new shell and cooling equipment, resulting in a long replacement cycle, high costs, complex technology, and difficulty in construction. Furthermore, the blast furnace's structural dimensions are difficult to control, significantly impacting subsequent production. Summary of the Invention

[0004] To overcome the shortcomings of the existing technology, the present invention provides a method for replacing the entire blast furnace shell without the use of temporary measures. By dismantling and installing the entire blast furnace shell in sections in a symmetrical manner, the speed of replacing the entire blast furnace shell is accelerated. No large-scale temporary measures are required to assist in the construction, thereby improving work efficiency, shortening the replacement time, and ensuring that the overall size of the blast furnace and equipment are not affected. This saves replacement costs and ensures the safety of the replacement operation.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] A method for replacing the entire blast furnace shell without using temporary measures, the method comprising the following steps:

[0007] S1. Divide the entire furnace shell into several parts along the circumference radially, confirm the cutting lines on the furnace shell, and mark the reference lines.

[0008] S2. The furnace shell replacement adopts a sequential and symmetrical construction method, and the most severely damaged area is removed by gas cutting as the first piece of old furnace shell to be replaced.

[0009] S3. Replace the old furnace shell with a new one according to the old furnace shell's structural form. After the new furnace shell is in place, weld the upper and lower circumferential welds of the first new furnace shell piece that has been replaced.

[0010] S4. Determine the furnace shell at the symmetrical position of the diameter of the first old furnace shell as the second old furnace shell. Remove the second old furnace shell using the same cutting method. Repeat the method of step S3 to weld the upper and lower circumferential welds of the replacement second new furnace shell.

[0011] S5. Following the symmetrical replacement sequence, repeat the replacement method of S2 to S4. Replace the third old furnace shell on the side adjacent to the first old furnace shell and the fourth old furnace shell on the symmetrical position of the third old furnace shell. After the third new furnace shell and the fourth new furnace shell are in place, first weld the vertical weld between the two adjacent new furnace shells that have been replaced, and then weld the upper and lower circumferential welds of the new furnace shell.

[0012] S6. Repeat the replacement method of S5 to replace the fifth old furnace shell on the other side of the first old furnace shell and the sixth old furnace shell at the symmetrical position of the fifth old furnace shell. After the fifth new furnace shell and the sixth new furnace shell are in place, first weld the vertical weld between the two adjacent new furnace shells, and then weld the upper and lower circumferential welds of the new furnace shell.

[0013] S7. Repeat the replacement method of S5 to S6, and replace the old furnace shells on the adjacent two sides and the symmetrical positions on both sides in turn, until all the old furnace shells of the whole belt are replaced with new furnace shells, and the replacement of the whole blast furnace shell is completed.

[0014] Furthermore, in step S1, the number of parts into which the entire furnace shell is divided is an even number.

[0015] Furthermore, in step S1, the entire furnace shell is symmetrically split according to the original weld seam of the furnace shell.

[0016] Furthermore, the vertical weld and circumferential weld adopt the method of first welding the inner bevel weld of the entire furnace shell and then welding the outer bevel weld.

[0017] Furthermore, the circumferential weld and the vertical weld are welded using segmented back-and-forth welding.

[0018] Furthermore, after the vertical and circumferential welds are welded with one layer, the weld area is tapped using a stress-relieving device.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. The replacement of the entire blast furnace shell adopts a segmented dismantling and installation approach, with the replacement of the shell carried out symmetrically in sequence. This reduces the difficulty of construction, concentrates the replacement of damaged areas, improves the efficiency of the replacement operation, shortens the replacement time, and allows for segmented whole-strip replacement without affecting the overall size of the blast furnace and the connection status of the equipment. This ensures subsequent production efficiency, saves a lot of construction costs, and guarantees the quality and safety of the construction operation.

[0021] 2. Replace the components symmetrically in sequence to reduce stress concentration during replacement, reduce deformation during the process, lower the difficulty of welding, reduce the risk of welding deformation, improve welding quality, enhance welding effect, and ensure the quality of construction operations. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the replacement sequence of the entire blast furnace shell as described in this invention.

[0023] Figure 2 This is a schematic diagram of the segmented back welding of the vertical seam of the furnace shell as described in this invention.

[0024] Figure 3 This is a schematic diagram of the segmented back welding of the furnace shell circumferential seam as described in this invention.

[0025] In the diagram: 1. First new furnace shell; 2. Second new furnace shell; 3. Third new furnace shell; 4. Fourth new furnace shell; 5. Fifth new furnace shell; 6. Sixth new furnace shell; 7. First section of weld re-welding; 8. Second section of weld re-welding; 9. Third section of weld re-welding. Detailed Implementation

[0026] The specific embodiments of the present invention will be further described below:

[0027] like Figures 1-3 As shown, a method for replacing the entire blast furnace shell without using temporary measures is described. The method includes the following steps:

[0028] S1. The entire furnace shell is divided into 6 pieces. The furnace shell is symmetrically removed and installed according to the original weld seam. Before removing the furnace shell, the cutting line should be confirmed on the section of the furnace shell to be removed, and a reference line should be marked.

[0029] S2. The furnace shell replacement adopts a sequential and symmetrical construction method, and the most severely damaged area is removed by gas cutting as the first piece of old furnace shell to be replaced.

[0030] S3. Replace the old furnace shell with a new furnace shell according to the structural form of the old furnace shell. Install the new furnace shell at the location where the old furnace shell was removed. After the new furnace shell is in place, weld the upper and lower circumferential welds of the first new furnace shell 1 that has been replaced.

[0031] S4. The furnace shell at the symmetrical position of the diameter of the first old furnace shell is identified as the second old furnace shell to be replaced. The second old furnace shell is removed by the same cutting method. The upper and lower circumferential welds of the second new furnace shell 2 are welded together by repeating the method of step S3.

[0032] S5. Following the symmetrical replacement sequence, repeat the replacement methods from S2 to S4. Replace the third old furnace shell on the side adjacent to the first old furnace shell and the fourth new furnace shell symmetrically positioned to the third old furnace shell. After the third new furnace shell 3 and the fourth new furnace shell 4 are in place, first weld the vertical weld between the two adjacent new furnace shells that have been replaced, and then weld the upper and lower circumferential welds of the new furnace shell. The welding sequence for the third new furnace shell 3 is to first weld the vertical weld between the first new furnace shell 1 and the third new furnace shell 3, and then weld the upper and lower circumferential welds of the third new furnace shell 3. The welding sequence for the fourth new furnace shell 4 is to first weld the vertical weld between the second new furnace shell 2 and the fourth new furnace shell 4, and then weld the upper and lower circumferential welds of the fourth new furnace shell 4.

[0033] S6. Repeat the replacement method in S5 to replace the fifth old furnace shell on the opposite side of the first old furnace shell and the sixth old furnace shell symmetrically positioned on the fifth old furnace shell. After the fifth and sixth new furnace shells are in place, first weld the vertical weld between the two adjacent new furnace shells, and then weld the upper and lower circumferential welds of the new furnace shells. The welding sequence for the fifth new furnace shell 5 is to first weld the vertical weld between the first new furnace shell 1 and the fifth new furnace shell 5, then weld the vertical weld between the fourth new furnace shell 4 and the fifth new furnace shell 5, and then weld the upper and lower circumferential welds of the fifth new furnace shell 5. The welding sequence for the sixth new furnace shell 6 is to first weld the vertical weld between the second new furnace shell 2 and the sixth new furnace shell 6, then weld the vertical weld between the sixth new furnace shell 6 and the third new furnace shell 3, and then weld the upper and lower circumferential welds of the sixth new furnace shell 6. The replacement of the entire blast furnace shell is now complete.

[0034] Furthermore, in step S1, the number of parts of the whole furnace shell is even, and the even number of parts are symmetrically welded, which cancels out the welding stress and strain.

[0035] Furthermore, in step S1, the entire furnace shell is symmetrically split according to the original weld seam of the furnace shell.

[0036] Furthermore, the vertical weld and circumferential weld adopt the method of first welding the inner bevel weld of the entire furnace shell and then welding the outer bevel weld.

[0037] like Figures 2-3 As shown, the circumferential weld and vertical weld are welded in sections. The vertical weld is welded in two sections. The first section 7 and the second section 8 are welded from the middle to both sides. The circumferential weld is welded in six sections. The welds are welded symmetrically from the middle to both sides. The sequence of the section welds is: the first section 7 - the second section 8 - the third section 9.

[0038] Furthermore, after welding one layer, the vertical and circumferential weld seams are tapped in the weld area using a stress relief device to release stress.

[0039] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for replacing the entire blast furnace shell without using temporary measures, characterized in that, The method for replacing the entire blast furnace shell includes the following steps: S1. Divide the entire furnace shell into several parts along the circumference radially, confirm the cutting lines on the furnace shell, and mark the reference lines. S2. The furnace shell replacement adopts a sequential and symmetrical construction method, and the most severely damaged area is removed by gas cutting as the first piece of old furnace shell to be replaced. S3. Replace the old furnace shell with a new one according to the old furnace shell's structural form. After the new furnace shell is in place, weld the upper and lower circumferential welds of the first new furnace shell piece that has been replaced. S4. Determine the furnace shell at the symmetrical position of the diameter of the first old furnace shell as the second old furnace shell. Remove the second old furnace shell using the same cutting method. Repeat the method of step S3 to weld the upper and lower circumferential welds of the replacement second new furnace shell. S5. Following the symmetrical replacement sequence, repeat the replacement method of S2 to S4. Replace the third old furnace shell on the side adjacent to the first old furnace shell and the fourth old furnace shell on the symmetrical position of the third old furnace shell. After the third new furnace shell and the fourth new furnace shell are in place, first weld the vertical weld between the two adjacent new furnace shells that have been replaced, and then weld the upper and lower circumferential welds of the new furnace shell. S6. Repeat the replacement method of S5 to replace the fifth old furnace shell on the other side of the first old furnace shell and the sixth old furnace shell at the symmetrical position of the fifth old furnace shell. After the fifth new furnace shell and the sixth new furnace shell are in place, first weld the vertical weld between the two adjacent new furnace shells, and then weld the upper and lower circumferential welds of the new furnace shell. S7. Repeat the replacement method of S5 to S6, and replace the old furnace shells on the adjacent two sides and the symmetrical positions on both sides in turn, until all the old furnace shells of the whole belt are replaced with new furnace shells, and the replacement of the whole blast furnace shell is completed.

2. The method for replacing the entire blast furnace shell without using temporary measures, as described in claim 1, is characterized in that... In step S1, the number of parts into which the entire furnace shell is divided is an even number.

3. The method for replacing the entire blast furnace shell without using temporary measures, as described in claim 1, is characterized in that... In step S1, the entire furnace shell is symmetrically split according to the original weld seam of the furnace shell.

4. A method for replacing the entire blast furnace shell without using temporary measures, as described in claim 1, characterized in that... The vertical and circumferential welds are constructed by first welding the inner bevel weld of the entire furnace shell and then welding the outer bevel weld.

5. A method for replacing the entire blast furnace shell without using temporary measures, as described in claim 1, characterized in that... The circumferential weld and vertical weld are welded using segmented back-and-forth welding.

6. A method for replacing the entire blast furnace shell without using temporary measures, as described in claim 1, characterized in that... After one layer of welding is completed, the weld area of ​​the vertical and circumferential welds is tapped using a stress-relieving device.

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