CN117987608A - Replacement and transformation method for cooling wall of blast furnace - Google Patents
Replacement and transformation method for cooling wall of blast furnace Download PDFInfo
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- CN117987608A CN117987608A CN202311842228.0A CN202311842228A CN117987608A CN 117987608 A CN117987608 A CN 117987608A CN 202311842228 A CN202311842228 A CN 202311842228A CN 117987608 A CN117987608 A CN 117987608A
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- cooling wall
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- new cooling
- stave
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- 238000001816 cooling Methods 0.000 title claims abstract description 145
- 238000011426 transformation method Methods 0.000 title description 2
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000002407 reforming Methods 0.000 claims abstract description 17
- 238000012360 testing method Methods 0.000 claims abstract description 17
- 238000009434 installation Methods 0.000 claims abstract description 16
- 239000011449 brick Substances 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 239000002893 slag Substances 0.000 claims description 9
- 230000002706 hydrostatic effect Effects 0.000 claims description 7
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 6
- 210000000078 claw Anatomy 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000013102 re-test Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Landscapes
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Blast Furnaces (AREA)
Abstract
The invention relates to the technical field of blast furnace equipment maintenance, in particular to a method for replacing and reforming a blast furnace cooling wall, which comprises the following steps: dismantling the old cooling wall; checking and numbering the new cooling wall block by block and performing a hydraulic test; brick embedding is carried out on the new cooling wall; after a plurality of electric hoists are installed at intervals in the circumferential direction at the top part of the furnace, a prefabricated hanging scaffold is put into the furnace for assembly, and after a platform plate is fully paved on the hanging scaffold, the hanging scaffold is hung by the electric hoists to be used as an inner operation platform for installing a new cooling wall; after the new cooling wall is lifted to the furnace top platform by utilizing the furnace top travelling crane, the new cooling wall is lifted by a winch, and after the new cooling wall is lifted to the upper part of the hanging scaffold, the new cooling wall is dumped to each new cooling wall installation position by an electric hoist for installation: and pointing the installed new cooling wall. The method can meet the replacement work of the cooling wall at different positions with different sizes, improves the dismantling and installing efficiency of the cooling wall, reduces the labor intensity and saves the efficacy.
Description
Technical Field
The invention relates to the technical field of blast furnace equipment maintenance, in particular to a method for replacing and reforming a blast furnace cooling wall.
Background
The reasonable cooling of the blast furnace body has decisive effects on protecting brick lining and metal components and maintaining reasonable furnace type, determines the service life of the blast furnace to a great extent, and has important influence on the technical and economic indexes of the blast furnace. The main effect of reasonable cooling of the blast furnace body is shown in the following steps: the temperature of the furnace lining is reduced, so that the brick lining keeps certain strength, the furnace shape is maintained, and the service life is prolonged; forming protective slag skin and protecting furnace lining; protecting metal structures such as furnace shells, struts and the like from high temperature; some cooling devices may also function to support portions of the brick lining.
In actual production, cooling walls are generally adopted to realize reasonable cooling of the blast furnace body. The stave may be a cast iron plate with seamless steel pipes cast therein and mounted between the brick lining and the furnace shell. The cooling wall starts to be damaged to different degrees after working for one or two years, so that the unstable phenomenon of the operation of the furnace body occurs. Therefore, the stave needs to be replaced in time, however, the method of replacing the stave in the prior art requires great labor intensity and low efficiency, which is not desirable for those skilled in the art.
Disclosure of Invention
Aiming at the problems, the invention discloses a method for replacing and reforming a cooling wall of a blast furnace, which comprises the following steps:
step S1: after the furnace is stopped, slag removal treatment is carried out in the furnace, the old cooling wall is removed, and the old cooling wall is dumped out of the furnace through 2 channels in the furnace;
When the old cooling wall is detached, the door cooling wall is detached firstly, and then the old cooling wall is detached at the same time by dividing the two sides;
Step S2: checking and numbering the new cooling wall block by block and performing a hydraulic test;
step S3: bricks are inlaid on the new cooling wall qualified in pressure test;
Step S4: after a plurality of electric hoists are installed at intervals in the circumferential direction at the top part of the furnace, a prefabricated hanging scaffold is put into the furnace for assembly, and after a platform plate is fully paved on the assembled hanging scaffold, the hanging scaffold is hoisted by the electric hoists to be used as an inner operation platform for installing a new cooling wall;
Step S5: lifting the new cooling wall to the furnace top platform by utilizing a furnace top travelling crane, lifting the new cooling wall by a winch, lifting the new cooling wall to the position above a lifting disc, and transporting the new cooling wall to each new cooling wall mounting position by an electric hoist for mounting;
Step S6: and pointing the installed new cooling wall.
In some embodiments, in the step S1, when the old stave is removed, a constructor outside the furnace cuts off the stave piping, bolts and the enclosure in advance, so that the old stave is completely disconnected from the furnace shell, then a reaction force bracket of the mechanical roof is welded at the water pipe hole on the furnace shell, the mechanical roof is mounted in the reaction force bracket, and then the old stave is jacked into the furnace from the water pipe hole on the furnace shell by the mechanical roof.
In some of these embodiments, the reaction bracket is a U-shaped card.
In some of these embodiments, in said step S1, the 2 channels are a furnace roof manhole and a furnace floor slag hole, respectively.
In some of these embodiments, in said step S2, the hydrostatic test is performed at a pressure of 1.5Mpa for a duration of at least 20min.
In some of these embodiments, in the step S2, after the hydrostatic test on the new stave, a step of ball passing test on the new stave is further included.
In some embodiments, the electric hoist is a 5 ton electric hoist.
In some of these embodiments, the platform plate is a patterned steel plate or a steel springboard.
In some embodiments, in the step S5, the step of transporting the new cooling wall to each installation position by the electric hoist for installation specifically includes:
Two steel wire ropes are respectively penetrated out of the upper bolt holes and the lower bolt holes of the new cooling wall and are led out of the furnace through the bolt holes on the furnace shell to be connected with a first chain block corresponding to the outside of the new cooling fireplace;
Hanging a second chain block on a hole formed in a cooling wall of the new cooling wall, and hanging a lifting lug of the new cooling wall by using the second chain block;
Pulling a new cooling wall in place, adjusting the upper and lower heights of the new cooling wall through a second hand-pulling hoist at the cooling wall part on the new cooling wall, and strongly pulling the new cooling wall by utilizing a first hand-pulling hoist corresponding to the outside of the new cooling fireplace while adjusting the upper and lower heights of the new cooling wall so as to draw the new cooling wall towards the inner wall of the furnace shell;
And after the water pipe of the new cooling wall is completely positioned, the bolts of the new cooling wall are well arranged.
In some embodiments, in the step S6, before the new stave after the secondary seam adjustment is subjected to the pointing treatment, the installed new stave is subjected to the secondary seam adjustment, and each bolt is screwed to the same extent when the new stave is installed, and the bolts and nuts, the nuts and the backing plates, and the backing plates and the furnace shell are welded together.
Compared with the prior art, the invention has at least the following advantages or beneficial effects:
The invention discloses a method for replacing and reforming a cooling wall of a blast furnace, which meets the requirements of a construction site, is flexible to operate, can meet the replacement work of the cooling wall on different positions with different sizes, improves the dismantling and installing efficiency of the cooling wall, reduces the labor intensity, saves the efficacy, and ensures the safety and the quality of construction operation.
Drawings
The invention and its features, aspects and advantages will become more apparent from the detailed description of non-limiting embodiments with reference to the following drawings. Like numbers refer to like parts throughout. The drawings may not be to scale, emphasis instead being placed upon illustrating the principles of the invention.
FIG. 1 is a flow chart of a method for replacing and reforming a blast furnace stave according to an embodiment of the present invention;
FIG. 2 is a schematic view of an old stave according to an embodiment of the present invention;
FIG. 3 is a schematic view of a hanging scaffold in the present invention;
FIG. 4 is a schematic diagram of a new stave transport process according to an embodiment of the present invention;
FIG. 5 is a schematic view of a new stave installation structure according to an embodiment of the present invention;
wherein 1 is a furnace shell; 2 is old cooling wall; 2' is a new stave; 3 is a counter-force bracket; 4 is a mechanical roof; 5 is an external operation platform; 6 is a hanging scaffold; 61 is a lifting lug; 7 is a connecting steel wire rope; 8 is a 5 ton winch; 9 is a first hand-pulling block; 10 is a second pull block; 11 is a top drive.
Detailed Description
The invention will now be further described with reference to the accompanying drawings and specific examples, which are not intended to limit the invention.
As shown in fig. 1, the embodiment discloses a method for replacing and reforming a cooling wall of a blast furnace, which specifically comprises the following steps:
Step S1: after the furnace is stopped and slag removal is carried out on the inside of the furnace, the old cooling wall 2 is removed (namely, the old cooling wall 2 is removed after the slag removal in the furnace is finished after the furnace is stopped), and the old cooling wall 2 is dumped out of the furnace through 2 channels in the furnace; according to the characteristics of the cooling wall, when the old cooling wall 2 is detached, the cooling wall of the door is detached first, and then the old cooling wall 2 is detached at the same time by dividing two sides.
Specifically, in step S1, when the old stave 2 is removed, a constructor outside the furnace cuts off the stave piping, bolts and the enclosure on the outer operation platform 5 in advance, so that the old stave 2 is completely disconnected from the furnace shell 1, then a reaction force bracket 3 of a mechanical roof 4 is welded at a water pipe hole on the furnace shell 1, a mechanical roof 4 (specifically, a 10 ton or 16 ton mechanical roof) is installed in the reaction force bracket 3, and then the old stave 2 is jacked into the furnace from the water pipe hole on the furnace shell 1 by adopting the mechanical roof 4; specifically, the reaction force bracket 3 is a U-shaped card, and has a structure as shown in fig. 2.
In the embodiment of the invention, the 2 channels are a furnace top manhole (a first transportation channel) and a furnace bottom slag hole (a second transportation channel) respectively, specifically, when the furnace top manhole is used as the first transportation channel of the old cooling wall 2 to transport the old cooling wall 2 out of the furnace, the furnace top manhole is opened, a movable platform above the furnace top manhole is removed, the old cooling wall 2 in the furnace is lifted out by using a furnace top crane 11, the suspended old cooling wall 2 is placed on a flat car by the furnace top crane 11, and the old cooling wall 2 is transported out of the construction site in a centralized manner; when the old cooling wall 2 is dumped out of the furnace by taking the furnace bottom slag removal holes as a second conveying passage of the old cooling wall 2, a winch is arranged around a furnace bottom structural column, the cooling wall is pulled out of the furnace body to fall on the ground of the furnace bottom, then the winch is pulled out of the furnace bottom area, and the crane is used for loading and conveying out of a construction site.
Step S2: the new stave 2' is inspected, numbered and hydrostatic tested block by block. The new cooling wall 2 'is tested for pressure, the new cooling wall 2' is pressed block by block according to the design rule before being installed, and the installation can be prepared after the standard is reached and written records are formed. Specifically, checking and numbering the new cooling wall 2' block by block before installation, carrying out a hydrostatic test, wherein the hydrostatic test pressure is 1.5Mpa, the duration time is at least 20min, no water leakage phenomenon exists, then carrying out a leakage test, checking whether water inlet and outlet of each pipe are smooth, and blowing off accumulated water and residues in the pipe by using compressed air after the work is finished; checking whether the water inlet and outlet pipe is provided with a claw pipe (the water inlet and outlet pipe is not perpendicular to the cooling wall), treating the claw pipe, and re-testing pressure, wherein the claw pipe affects the installation speed, and when the hole is cut for the second time, the furnace shell 1 is opened too much to be sealed, and the water pipe is possibly cut. If the field conditions allow the water pressure test to be carried out, a ball passing test should be carried out, so that the compressed air is blown through the wood balls to be qualified.
Step S3: bricks are inlaid on the new cooling wall 2' qualified in pressure test according to the drawing requirements; and checking and confirming the pipe distance of the new cooling wall 2' and the positioning size of the hole of the furnace shell 1 after bricks are inlaid, and setting out a template in advance.
Step S4: after 4 electric hoists of 20 meters of 5 tons are circumferentially arranged at intervals at the top part of the furnace, the prefabricated hanging scaffold 6 is put into the furnace to be assembled (when the old cooling wall 2 in the furnace is cleaned), and after a platform plate is fully paved (welded) on the assembled hanging scaffold 6, the hanging scaffold 6 is lifted and leveled by the electric hoists through lifting lugs 61 on the hanging scaffold 6, and after the standard is met, the hanging scaffold 6 is used as an inner operation platform for installing a new cooling wall 2'; specifically, the platform plate is a patterned steel plate or a steel springboard; such as the structure shown in fig. 3.
Step S5: lifting the new cooling wall 2 'to the furnace top platform by using the furnace top crane 11, lifting the new cooling wall 2' by using a 5-ton winch 8, pushing the new cooling wall 2 'into the furnace by manpower, lifting the new cooling wall 2' above the hanging scaffold 6, and then, transporting the new cooling wall 2 'to each new cooling wall 2' installation position by using a 5-ton electric hoist for installation (the hanging scaffold 6 is lifted below the new cooling wall 2 'installation position, the hanging scaffold 6 is hung on a lifting lug of the furnace wall through a chain, and the double protection is realized by connecting the hanging scaffold 6 with the lifting lug of the hanging scaffold 6 through a connecting steel wire rope 7 by using a chain hoist positioned at the furnace top, so that the 5-ton electric hoist is vacated, and the new cooling wall 2' can be transported to each new cooling wall installation position; as shown in the structures of fig. 4 and 5.
As shown in fig. 5, specifically, in step S5, the step of transporting the new stave 2' to each installation position by the electric hoist and installing it is specifically:
Two steel wires are respectively penetrated from the upper bolt holes and the lower bolt holes of the new cooling wall 2 'and are led out of the furnace through the bolt holes on the furnace shell 1 to be connected with a first hand-pulled hoist 9 corresponding to the outside of the furnace of the new cooling wall 2' (the first hand-pulled hoist 9 is arranged on the counterforce bracket 3 arranged when the old cooling wall 2 is detached).
Two second chain blocks 10 (3 ton chain blocks) are hung on holes formed in the cooling wall of the new cooling wall 2', and the lifting lugs 61 of the new cooling wall 2' are hung by the second chain blocks 10.
After the above work is finished, the new cooling wall 2 'starts to be pulled to be in place, the upper and lower heights of the new cooling wall 2' are accurately adjusted through the two second hand-pulled blocks 10 at the cooling wall position on the new cooling wall 2', and the new cooling wall 2' is pulled by the first hand-pulled blocks 9 corresponding to the outside of the furnace of the new cooling wall 2 'to be close to the inner wall of the furnace shell 1 while the upper and lower heights of the new cooling wall 2' are adjusted.
After the water pipes (generally two water pipes) of the new cooling wall 2 'are completely positioned, the bolts of the new cooling wall 2' are well mounted; specifically, firstly, bolts of bolt holes of which the lower parts are not threaded with steel wire ropes are well arranged, then the steel wire ropes in the bolt holes of the upper parts are taken out, the bolts are well arranged, and finally the bolts of the lower parts are arranged.
Step S6: and (3) pointing the installed new cooling wall 2'.
In step S6, before the new stave 2' after the secondary seam adjustment is subjected to the pointing treatment, the secondary seam adjustment is performed on the installed new stave 2', and each bolt is screwed to the same extent when the new stave 2' is installed, and the bolts and nuts, the nuts and the backing plates, and the backing plates and the furnace shell 1 are welded.
It should be noted here that, because the cooling wall is a casting, the actual arc length and the actual height are different, and there is a certain error in the position during installation, so that the gap formed sometimes has a small or uneven size, and secondary joint adjustment is required. The method for solving the gap comprises the steps of dividing the gap equally according to the actual inner circumference of the furnace shell during paying off, reducing deviation, setting elevation control lines, reducing vertical gap deviation, properly allocating and avoiding the cooling walls with large tolerance to be driven together during cooling wall inspection, and performing pointing treatment on the cooling walls at any time by constructors specialized in furnace building after the cooling walls are installed and fixed.
In summary, the method for replacing and reforming the cooling wall of the blast furnace disclosed by the invention has the advantages that the related equipment is simple in structure and convenient to adjust, the requirements of a construction site are met, the operation is flexible, the replacement work of the cooling wall on different positions with different sizes can be met, the dismantling and installing efficiency of the cooling wall is improved, the labor intensity is reduced, the efficiency is saved, and the safety and the quality of construction operation are ensured.
Those skilled in the art will understand that the skilled person can implement the modification in combination with the prior art and the above embodiments, and this will not be repeated here. Such modifications do not affect the essence of the present invention, and are not described herein.
The preferred embodiments of the present invention have been described above. It is to be understood that the invention is not limited to the specific embodiments described above, wherein devices and structures not described in detail are to be understood as being implemented in a manner common in the art; any person skilled in the art can make many possible variations and modifications to the technical solution of the present invention or modifications to equivalent embodiments without departing from the scope of the technical solution of the present invention, using the methods and technical contents disclosed above, without affecting the essential content of the present invention. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (10)
1. The method for replacing and reforming the cooling wall of the blast furnace is characterized by comprising the following steps of:
step S1: after the furnace is stopped, slag removal treatment is carried out in the furnace, the old cooling wall is removed, and the old cooling wall is dumped out of the furnace through 2 channels in the furnace;
When the old cooling wall is detached, the door cooling wall is detached firstly, and then the old cooling wall is detached at the same time by dividing the two sides;
Step S2: checking and numbering the new cooling wall block by block and performing a hydraulic test;
step S3: bricks are inlaid on the new cooling wall qualified in pressure test;
Step S4: after a plurality of electric hoists are installed at intervals in the circumferential direction at the top part of the furnace, a prefabricated hanging scaffold is put into the furnace for assembly, and after a platform plate is fully paved on the assembled hanging scaffold, the hanging scaffold is hoisted by the electric hoists to be used as an inner operation platform for installing a new cooling wall;
step S5: lifting the new cooling wall to the furnace top platform by utilizing the furnace top travelling crane, lifting the new cooling wall by a winch, lifting the new cooling wall to the position above the hanging scaffold, and transporting the new cooling wall to each new cooling wall mounting position by an electric hoist for mounting;
Step S6: and pointing the installed new cooling wall.
2. The method for replacing and reforming a stave according to claim 1, wherein in the step S1, when the old stave is removed, a constructor outside the furnace cuts off the stave piping, bolts and the cover in advance to completely disconnect the old stave from the furnace shell, welds a reaction force bracket of the mechanical roof at the water pipe hole on the furnace shell, installs the mechanical roof in the reaction force bracket, and then pushes the old stave into the furnace from the water pipe hole on the furnace shell by using the mechanical roof.
3. The method for replacing and reforming a cooling wall of a blast furnace according to claim 2, wherein the reaction bracket is a U-shaped card.
4. The method for replacing and reforming a blast furnace stave according to claim 1, wherein in said step S1, 2 passages are a furnace top manhole and a furnace bottom slag hole, respectively.
5. The method for replacing and reforming a stave according to claim 1, wherein in said step S2, the hydrostatic test is performed at a pressure of 1.5Mpa for a duration of at least 20min.
6. The method for replacing and reforming a stave according to claim 1, further comprising the step of performing a ball passing test on the new stave after performing a hydrostatic test on the new stave in the step S2.
7. The method for replacing and reforming a blast furnace stave according to claim 1, wherein the electric block is a 5-ton electric block.
8. The method for replacing and reforming a blast furnace stave according to claim 1, wherein the platform plate is a patterned steel plate or a steel springboard.
9. The method for replacing and reforming a stave according to claim 1, wherein in the step S5, the step of transporting the new stave to each installation position by the electric block for installation is specifically:
Two steel wire ropes are respectively penetrated out of the upper bolt holes and the lower bolt holes of the new cooling wall and are led out of the furnace through the bolt holes on the furnace shell to be connected with a first chain block corresponding to the outside of the new cooling fireplace;
Hanging a second chain block on a hole formed in a cooling wall of the new cooling wall, and hanging a lifting lug of the new cooling wall by using the second chain block;
Pulling a new cooling wall in place, adjusting the upper and lower heights of the new cooling wall through a second hand-pulling hoist at the cooling wall part on the new cooling wall, and strongly pulling the new cooling wall by utilizing a first hand-pulling hoist corresponding to the outside of the new cooling fireplace while adjusting the upper and lower heights of the new cooling wall so as to draw the new cooling wall towards the inner wall of the furnace shell;
And after the water pipe of the new cooling wall is completely positioned, the bolts of the new cooling wall are well arranged.
10. The method for replacing and reforming a stave according to claim 9, wherein in the step S6, before the new stave after the secondary joint is subjected to the joint-pointing treatment, the secondary joint-pointing is performed on the installed new stave, and each bolt is screwed to the same degree when the new stave is installed, and the bolts and nuts, the nuts and the backing plates, and the backing plates and the furnace shell are welded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311842228.0A CN117987608A (en) | 2023-12-28 | 2023-12-28 | Replacement and transformation method for cooling wall of blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311842228.0A CN117987608A (en) | 2023-12-28 | 2023-12-28 | Replacement and transformation method for cooling wall of blast furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117987608A true CN117987608A (en) | 2024-05-07 |
Family
ID=90887929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311842228.0A Pending CN117987608A (en) | 2023-12-28 | 2023-12-28 | Replacement and transformation method for cooling wall of blast furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117987608A (en) |
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2023
- 2023-12-28 CN CN202311842228.0A patent/CN117987608A/en active Pending
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