A construction method for replacing the refractory material of riser and fall pipes
By isolating the riser and downcomer pipes from the five-way ball before blast furnace shutdown, simultaneously removing and restoring refractory materials, and using scaffolding and vertical material transportation tools, the problem of slow progress in short-term blast furnace overhaul was solved, achieving efficient and safe construction.
Patent Information
- Application Number
- CN202310781468.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-06-29
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2043-06-29
AI Technical Summary
The construction progress during the short-term intermediate repair of the blast furnace is slow, which affects the construction efficiency.
Before shutting down the blast furnace, the connection points between the riser pipe and the downcomer pipe and the five-way ball are sealed and isolated. The refractory materials inside the five-way ball, downcomer pipe and riser pipe are removed and restored simultaneously. Scaffolding and vertical material transportation tools are used for efficient construction.
It improved construction efficiency, ensured construction safety, and shortened construction time.
Smart Images
Figure CN116769989B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of blast furnace construction technology, and more specifically, to a method for replacing the refractory material in the riser and fallr tubes. Background Technology
[0002] Short-term blast furnace overhauls are one of the preferred methods for most steel plants. Short-term overhauls typically include: replacing cooling walls, cleaning slag inside the furnace, and replacing the refractory material at the furnace bottom. From the time the blast furnace is shut down until the temperature drops to a level where personnel can enter and operate, a certain amount of time is required. During this period, no construction work can be carried out, which seriously affects the construction progress. Summary of the Invention
[0003] In view of this, the present invention proposes a construction method for replacing the refractory material of the riser and fallr pipes, which aims to solve the problem of slow construction progress during the existing short-term overhaul of blast furnaces.
[0004] This invention proposes a construction method for replacing the refractory material of riser and downcomer pipes, comprising the following steps:
[0005] Before shutting down the blast furnace, open the manhole of the top five-way ball and seal the joints between the four riser pipes, one downpipe and the five-way ball with steel plates to effectively isolate the five-way ball from the riser pipes and downpipes.
[0006] The refractory material in the five-way ball, the downcomer, and each of the upcomers is removed simultaneously.
[0007] After the refractory material inside the five-way ball and the downcomer is removed, the sealing steel plate at the connection between the downcomer and the five-way ball is opened, the removed refractory material inside the five-way ball is discharged, and the refractory material is restored by spraying from top to bottom on the inner wall of the five-way ball; after the refractory material on the inner wall of the five-way ball is sprayed, the refractory material on the inner wall of the downcomer is sprayed and the wall is constructed.
[0008] Simultaneously carry out the lining and spraying restoration work of the refractory materials inside each riser pipe. After the spraying and lining restoration work of the refractory materials inside the riser pipe is completed, the sealing steel plate at the connection between the five-way ball and each riser pipe can be opened.
[0009] Furthermore, in the above-mentioned method for replacing the refractory material of the riser and downcomer pipes, the operation of removing the refractory material on the inner wall of each riser pipe includes the following steps:
[0010] Before the blast furnace is shut down, a scaffolding platform is erected at the riser pipe of the gas cover platform to a predetermined height above the intersection of the outlet pipe and the riser pipe.
[0011] After the blast furnace is shut down, a square hole is opened at a predetermined position above the intersection of the outlet pipe and the riser pipe. This hole serves as a discharge hole for removing refractory materials and a brick inlet hole for restoring the masonry.
[0012] An isolation platform is set at a preset inclination angle inside the riser pipe at the discharge port, and a discharge pipe is installed at the discharge port to a preset height above the gas cover. A receiving trough is placed below the discharge pipe to receive the refractory material removed from the riser pipe.
[0013] A manhole is opened at the junction of the straight and inclined sections of each of the riser pipes, and an operating platform is installed at the manhole. The operating platform serves as the hoisting point for the removal and restoration of the lower refractory material and the scaffolding platform for the removal of the upper inclined refractory material, thereby removing the paint coating from the inclined sections of the riser pipes.
[0014] Furthermore, in the above-mentioned method for replacing the refractory material of the riser and fallr pipes, after the paint coating on the inclined section of the riser pipe is removed, a material vertical transport tool is installed inside and outside the riser pipe. The material required for the restoration work is lifted to the platform by the material vertical transport tool outside the pipe, and then manually transferred to the material vertical transport tool inside the pipe through the feed hole.
[0015] Furthermore, in the above-mentioned method for replacing the refractory material of the riser and downcomer pipes, the operation of restoring the refractory material on the inner wall of each riser pipe includes the following steps:
[0016] Using the dismantling hangers, the masonry is constructed from bottom to top along the straight section of the riser pipe, and the hangers are dismantled simultaneously as the masonry height increases.
[0017] Using the dismantling scaffold, first spray the lower half-circle of the inclined section of the ascending pipe from bottom to top, then spray the upper half-circle of the inclined section of the ascending pipe from top to bottom while simultaneously dismantling the scaffold.
[0018] Furthermore, in the above-mentioned method for replacing the refractory material of the riser and downcomer pipes, after the refractory material of the inclined section of the riser pipe is sprayed, the method further includes: removing the isolation platform at the straight section and inclined section of the riser pipe and repairing the missing refractory material. After acceptance, the manhole at this location is sealed.
[0019] Furthermore, in the above-mentioned method for replacing the refractory material of the riser and fallr pipes, after the refractory material of the inclined section of the riser pipe is sprayed, the method further includes: cleaning up the garbage on the isolation platform at the bottom of the riser pipe and removing the cover isolation platform, repairing the missing refractory material in this part, and sealing the manhole in this part after acceptance.
[0020] Furthermore, in the above-mentioned method for replacing the refractory material of the uplink and downlink pipes, the operation of removing the refractory material on the inner wall of the downlink pipe includes the following steps:
[0021] After the blast furnace is shut down, once the internal temperature and gas concentration of the pipeline are confirmed to be safe, the manhole at the top of the gravity dust collector or a manhole is opened in the vertical section of the downcomer. A steel structure platform is welded to the lower edge of the manhole to serve as a construction platform for the removal and restoration of the refractory material of the downcomer.
[0022] Furthermore, in the above-mentioned method for replacing the refractory material of the riser and fallr pipes, after the steel structure platform is installed, scaffolding is erected based on the steel structure platform, and the paint coating of the fallr pipes is removed from top to bottom. The removed paint coating falls through the steel structure platform into the bottom of the gravity dust collector, and then is discharged through the manhole of the gravity dust collector to the external discharge pipe to reach the designated position on the ground.
[0023] Furthermore, in the above-mentioned method for replacing the refractory material of the riser and fallr pipes, the operation of spraying paint to restore the refractory material on the inner wall of the fallr pipe is to spray the lower half-circle of the pipe from bottom to top, and then spray the upper half-circle of the pipe from top to bottom while simultaneously dismantling the scaffolding until completion.
[0024] Furthermore, in the above-mentioned method for replacing the refractory material of the riser and fallr pipes, the rebound material generated from the coating restoration of the inner wall of the fallr pipe is also discharged to a designated location through the lower manhole of the gravity dust collector.
[0025] The construction method for replacing the refractory material of the riser and downcomer pipes in this invention involves first isolating the connection ports of the riser, downcomer pipes and the five-way ball, and then simultaneously removing and restoring the refractory bricks and refractory materials inside the riser, downcomer pipes and the five-way ball. This greatly improves the work efficiency while ensuring the construction safety of the workers. Attached Figure Description
[0026] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:
[0027] Figure 1 This is a schematic diagram of the construction method for replacing the refractory material of the riser and fall pipes provided in an embodiment of the present invention;
[0028] Figure 2 This is a diagram showing the perforation arrangement of the refractory materials of the riser and downcomer in an embodiment of the present invention;
[0029] Figure 3 This is a schematic diagram of the discharge port at the bottom of the riser pipe in an embodiment of the present invention;
[0030] Figure 4 This is a schematic diagram of the isolation platform in the embodiment of the present invention. Detailed Implementation
[0031] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0032] See Figures 1 to 4 The method for replacing the refractory material of the riser and fall pipes according to an embodiment of the present invention includes the following steps:
[0033] Step S1: Before shutting down the blast furnace, open the manhole of the top five-way ball and seal the joints of the four ascending pipes 1 and one descending pipe 2 with the five-way ball using steel plates 9 to effectively isolate the five-way ball from the ascending pipes 1 and descending pipes 2.
[0034] Specifically, the four ascending pipes 1 and one descending pipe 2 are connected by a five-way ball (not shown in the figure). In order to speed up the construction progress and not affect the dismantling and restoration work, in this embodiment, the descending pipe 2 and the connection points between each ascending pipe 1 and the five-way ball are first separated by steel plates. The restoration work in this embodiment refers to the process of re-laying bricks and paint on the inner walls of the ascending pipes 1, descending pipes 2 and five-way ball after removing the brickwork and paint.
[0035] Step S2: Simultaneously remove the refractory material from the five-way ball, the downcomer, and each of the upcomers.
[0036] Specifically, the removal of the refractory material from the inner wall of each of the riser pipes includes the following steps:
[0037] (1) Before the blast furnace is shut down, a scaffolding platform 7 is erected at the rising pipe of the gas cover platform to a predetermined height above the intersection of the outlet pipe 3 and the rising pipe 1; for example, the scaffolding can be erected about 1m above the intersection of the outlet pipe 3 and the rising pipe 1.
[0038] (2) After the blast furnace is shut down, a square hole is opened at a predetermined position above the intersection of the outlet pipe and the riser pipe. This hole serves as a discharge hole for dismantling refractory materials and a brick inlet hole for re-laying. For example, a 700*700mm square hole can be opened about 1m above the intersection of the outlet pipe and the riser pipe. Preferably, all four corners of the square hole are chamfered. In practice, during the dismantling operation, a baffle can be installed at the outlet of the guide pipe to prevent the dismantling material generated during the dismantling operation from falling into the blast furnace.
[0039] (3) An isolation platform is set at a preset angle inside the riser pipe at the discharge port. A discharge pipe 5 is installed at the discharge port to a preset height above the gas cover. A receiving trough 6 is placed below the discharge pipe to receive the refractory material removed from the riser pipe. The isolation platform can be set at a 30° angle. In this embodiment, since some of the refractory material inside the riser pipe is damaged and the temperature drops after the furnace is shut down, the refractory material inside the pipe shrinks. Erecting and dismantling scaffolding inside the pipe is dangerous and the dismantled refractory material is likely to damage the scaffolding. Therefore, setting up an isolation platform can effectively improve the safety of the operation.
[0040] (4) A manhole is opened at the junction of the straight and inclined sections of each of the riser pipes, and an operating platform 8 is installed at the manhole. The operating platform 8 serves as the hoisting point for the removal and restoration of the lower refractory material and as the scaffolding platform for the removal of the upper inclined refractory material, thereby removing the paint coating from the inclined section of the riser pipe. In specific construction, hoisting points for the hoisting mechanism and scaffolding for steel plate sealing can be set on the operating platform. The operating platform 8 can be a platform made of multiple steel bars intersecting. Of course, in this embodiment, a manhole also needs to be opened on the side wall of each riser pipe located outside the blast furnace, and the manhole is set close to the guide pipe 3.
[0041] Furthermore, after the paint coating on the inclined section of the riser pipe is removed, a material vertical transport tool is installed inside and outside the riser pipe. The material required for the restoration work is lifted to the platform by the material vertical transport tool outside the pipe, and then manually transferred to the material vertical transport tool inside the pipe through the feed hole.
[0042] In practice, a 1-ton winch can be installed inside and outside the riser pipe. The materials required for masonry and spraying can be prepared in advance on the gas cover platform by the furnace top crane or large crane, and then pushed to the hoisting point of the winch outside each riser pipe by handcart. The materials required for resuming work can be lifted to the platform by the winch outside the pipe, and then manually transferred to the cage of the winch inside the pipe through the feed hole.
[0043] The operation of removing the refractory material from the inner wall of the downcomer includes the following steps:
[0044] After the blast furnace is shut down, once the internal temperature and gas concentration of the pipeline are confirmed to be safe, the manhole at the top of the gravity dust collector or a manhole is opened in the vertical section of the downcomer. A steel structure platform is welded to the lower edge of the manhole to serve as a construction platform for the removal and restoration of the refractory material of the downcomer.
[0045] After the steel structure platform is installed, scaffolding is erected on the basis of the steel structure platform, and the paint spraying on the downcomer pipe is removed from top to bottom. The removed paint spraying falls through the steel structure platform into the bottom of the gravity dust collector, and then is discharged through the manhole of the gravity dust collector to the external discharge pipe to reach the designated position on the ground.
[0046] Step S3: After the refractory material inside the five-way ball and the downcomer is removed, open the sealing steel plate at the connection between the downcomer and the five-way ball, discharge the removed refractory material inside the five-way ball, and restore the refractory material spraying of the inner wall of the five-way ball from top to bottom; after the refractory material spraying of the inner wall of the five-way ball is completed, spray the refractory material of the inner wall of the downcomer and build it.
[0047] Step S4: Simultaneously carry out the lining and spraying restoration work of the refractory material inside each riser pipe. After the spraying and lining restoration work of the refractory material inside the riser pipe is completed, the sealing steel plate at the connection between the five-way ball and each riser pipe can be opened.
[0048] Specifically, the restoration of the refractory material on the inner wall of each of the riser pipes includes the following steps:
[0049] (1) Using the dismantling hanger, the masonry is carried out from bottom to top from the straight section of the riser pipe. As the masonry height increases, the hanger is dismantled simultaneously. The hanger can be fixed on the isolation platform.
[0050] (2) Using the dismantling scaffold, first spray the lower half circle of the inclined section of the riser pipe from bottom to top, then spray the upper half circle of the inclined section of the riser pipe from top to bottom and dismantle the scaffold simultaneously.
[0051] After the refractory coating of the inclined section of the riser pipe is completed, the process includes: removing the isolation platform at the straight and inclined sections of the riser pipe and repairing any missing refractory material. After acceptance inspection, the manhole at this location is sealed. Next, the debris on the isolation platform at the bottom of the riser pipe is cleaned up, the cover isolation platform is removed, the missing refractory material in this area is repaired, and the manhole at this location is sealed after acceptance inspection. Finally, the platform outside the riser pipe and the winches inside and outside the riser pipe are removed.
[0052] In this embodiment, the work of spraying paint to restore the refractory material on the inner wall of the downcomer is to spray the lower half of the pipe from bottom to top, and then spray the upper half of the pipe from top to bottom while simultaneously dismantling the scaffolding until the work is completed.
[0053] The rebound material generated from the paint spraying restoration of the inner wall of the downcomer is also discharged to a designated location through the lower manhole of the gravity dust collector. Materials required for the downcomer restoration operation can be hoisted using winches located both inside and outside the downcomer, which can be installed externally.
[0054] In summary, the construction method for replacing the refractory material of the riser and downcomer pipes provided by this invention, by first isolating the connection ports of the riser pipe, downcomer pipe and five-way ball, and then simultaneously removing and restoring the refractory bricks and refractory materials inside the riser pipe, downcomer pipe and five-way ball, greatly improves the work efficiency while ensuring the construction safety of the workers.
[0055] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.
Claims
1. A method for replacing the refractory material of a riser / faller pipe, characterized in that, Includes the following steps: Before shutting down the blast furnace, open the manhole of the top five-way ball and seal the joints between the four riser pipes, one downpipe and the five-way ball with steel plates to effectively isolate the five-way ball from the riser pipes and downpipes. The refractory materials in the five-way ball, the downcomer, and each of the riser pipes are removed simultaneously. The removal of the refractory materials from the inner walls of each riser pipe includes: before the blast furnace is shut down, a scaffolding platform is erected at the riser pipe of the gas hood platform to a predetermined height above the intersection of the outlet pipe and the riser pipe; after the blast furnace is shut down, a square hole is opened at a predetermined position above the intersection of the outlet pipe and the riser pipe as a discharge hole for removing the refractory materials and as a brick inlet hole for restoring the masonry work; an isolation platform is set up at a predetermined angle inside the riser pipe at the location of the discharge hole, and a discharge pipe is installed at the discharge hole to a predetermined height above the gas hood platform, with a receiving trough placed below the discharge pipe to receive the refractory materials removed from the riser pipe; a manhole is opened at the junction of the straight and inclined sections of each riser pipe, and an installation is installed at this manhole. The operating platform serves as the hoisting point for the removal and restoration of the lower refractory material and as the scaffolding platform for the removal of the upper inclined refractory material, thereby removing the coating material from the inclined section of the ascending pipe. The operation of removing the refractory material from the inner wall of the descending pipe includes the following steps: After the blast furnace is shut down, after confirming that the internal temperature and gas concentration of the pipeline are safe, the manhole at the top of the gravity dust collector or a manhole is opened in the vertical section of the descending pipe. A steel structure platform is welded to the lower edge of the manhole as a construction platform for the removal and restoration of the descending pipe refractory material. After the steel structure platform is installed, scaffolding is erected based on the steel structure platform, and the coating material from top to bottom of the descending pipe is removed. The removed coating material falls into the bottom of the gravity dust collector through the steel structure platform, and then is discharged through the manhole of the gravity dust collector to the external discharge pipe to reach the designated position on the ground. After the refractory materials inside the five-way ball and the downcomer are removed, the sealing steel plate at the connection between the downcomer and the five-way ball is opened, the removed refractory materials inside the five-way ball are discharged, and the refractory material is restored by spraying from top to bottom on the inner wall of the five-way ball; after the refractory material on the inner wall of the five-way ball is sprayed, the refractory material on the inner wall of the downcomer is sprayed and laid; at the same time, the laying and spraying restoration of the refractory materials inside each of the riser pipes is carried out. After the spraying and laying restoration of the refractory materials inside the riser pipes is completed, the sealing steel plate at the connection between the five-way ball and each of the riser pipes is opened. The spraying and masonry restoration work of the refractory material inside each of the riser pipes includes the following steps: using a dismantling scaffold, masonry is carried out from bottom to top on the straight section of the riser pipe, and the scaffold is dismantled simultaneously as the masonry height increases; using a dismantling scaffold, the lower semi-cylinder of the inclined section of the riser pipe is sprayed from bottom to top, and then the upper semi-cylinder of the inclined section of the riser pipe is sprayed from top to bottom while the scaffold is dismantled simultaneously. The work of spraying paint to restore the refractory material on the inner wall of the downcomer is to spray the lower half of the pipe from bottom to top, and then spray the upper half of the pipe from top to bottom, while simultaneously dismantling the scaffolding until the work is completed.
2. The method for replacing the refractory material of the riser and fall pipes according to claim 1, characterized in that, After the paint coating on the inclined section of the riser pipe is removed, a material vertical transport tool is installed inside and outside the riser pipe. The material required for the restoration work is lifted to the platform by the material vertical transport tool outside the pipe, and then manually transferred to the material vertical transport tool inside the pipe through the feed hole.
3. The method for replacing the refractory material of the riser and fall pipe according to claim 1, characterized in that, After the refractory coating of the inclined section of the riser pipe is completed, the process also includes: removing the isolation platform at the straight section and inclined section of the riser pipe and repairing the missing refractory material. After acceptance, the manhole at this location is sealed.
4. The method for replacing the refractory material of the riser and fall pipe according to claim 3, characterized in that, After the refractory coating of the inclined section of the riser pipe is completed, the process also includes: cleaning up the debris on the isolation platform at the bottom of the riser pipe and dismantling the isolation platform, repairing the missing refractory material in this area, and sealing the manhole after acceptance.
5. The method for replacing the refractory material of the riser and fall pipe according to claim 4, characterized in that, The rebound material generated from the coating process on the inner wall of the downcomer is also discharged to a designated location through the lower manhole of the gravity dust collector.