Construction system and method of metal ceramic composite refractory material

Abstract

The invention discloses a construction system and method of a metal ceramic composite refractory material. The invention relates to the technical field of refractory material construction, and aims to solve the construction problem of a refractory castable containing metal fibers in limited spaces such as a blast furnace. The construction system comprises a blast furnace external casting house platform, a large forced stirrer, a high-pressure pump machine, a conveying pipeline, a blast furnace shell, a square manhole, an in-furnace operation platform, a small forced stirrer, a central discharging port, a rotatable discharging chute and a furnace wall mold. A fiber adding link is postposed through a two-step method, so that the base material keeps good flowability. And secondary stirring is completed in the furnace through the small forced stirrer, so that the contradiction that large equipment cannot enter and exit due to narrow space in the furnace is solved. Through the design of the central feed opening and the rotatable chute, uniform and slow material distribution to the annular mold is realized, material segregation is effectively avoided, and the integrity of a pouring body is ensured.

Description

Technical Field

[0001] This invention relates to the field of refractory material construction technology, and in particular to a construction system and method for metal-ceramic composite refractory materials. Background Technology

[0002] Metal-ceramic composite refractories are high-performance composite materials formed by adding high-temperature resistant stainless steel wire fibers to traditional refractory castables. The addition of stainless steel fibers can significantly improve the flexural strength, compressive strength, toughness, and thermal shock resistance of the refractory material after molding, effectively inhibiting the generation and propagation of cracks, thereby extending the service life of the lining.

[0003] However, the addition of metal fibers presents significant challenges to the on-site application of this material. The fibers readily overlap and entangle in the castable, drastically reducing the fluidity of the mixture and increasing frictional resistance. This renders traditional, high-efficiency pipeline pumping methods impossible, as the material easily clogs the pipes, hindering high-pressure transport. Conventional on-site mixing methods are also hampered by the limited space and manhole size within blast furnaces, preventing the entry of large mixing equipment and hindering construction. This bottleneck severely restricts the widespread application of this high-performance composite material in large industrial kilns, particularly blast furnaces.

[0004] Therefore, it is necessary to propose a construction system and method for metal-ceramic composite refractory materials to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a construction system and method for metal-ceramic composite refractory materials to solve the construction problem of refractory castables containing metal fibers in confined spaces such as blast furnaces.

[0006] In a first aspect, the present invention provides a construction system for metal-ceramic composite refractory materials, comprising: an external blast furnace tapping platform, a large forced mixer, a high-pressure pump, a conveying pipeline, a blast furnace shell, a square manhole, an internal furnace working platform, a small forced mixer, a central feeding port, a rotatable feeding chute, and a furnace wall mold. The large forced mixer and high-pressure pump are installed on the iron tapping platform outside the blast furnace. The blast furnace shell is located on one side of the iron tapping platform outside the blast furnace. The square manhole is located on the top of the blast furnace shell. The furnace working platform is located inside the upper part of the blast furnace shell. The small forced mixer is installed on the furnace working platform. The high-pressure pump is connected to the small forced mixer through a conveying pipeline. The central discharge port is located in the middle of the furnace working platform. The discharge port of the small forced mixer faces the central discharge port. The furnace wall mold is arranged around the circumference of the inner wall of the blast furnace shell. The top of the rotatable discharge chute is located below the central discharge port. The bottom of the rotatable discharge chute is connected to the furnace wall mold.

[0007] Furthermore, at least three small forced mixers are arranged on the furnace working platform.

[0008] Furthermore, the opening size of the square manhole is larger than the size of the small forced mixer.

[0009] Furthermore, the rotatable feeding chute can rotate 360 ​​degrees around the axis of the blast furnace shell.

[0010] Secondly, the present invention provides a construction method for a metal-ceramic composite refractory material, used in the construction system for the aforementioned metal-ceramic composite refractory material, the method comprising: Step 1: On the iron tapping platform outside the blast furnace, the dry powder of composite refractory material and binder are placed in a large forced mixer for the first mixing to obtain the matrix castable, which is then transported to the furnace working platform inside the blast furnace shell through a high-pressure pump and conveying pipeline. Step 2: Distribute the matrix castable material delivered by the conveying pipeline to the small forced mixers on the working platform inside the furnace. Add a predetermined amount of high-temperature resistant stainless steel wire fiber to each small forced mixer and carry out a second mixing to obtain a uniform metal-ceramic composite refractory material. Step 3: The second batch of mixed metal-ceramic composite refractory material is evenly distributed into the furnace wall mold through the central feeding port set on the working platform inside the furnace and the rotatable feeding chute below it.

[0011] Furthermore, in step one, the first stirring time is 3-5 minutes.

[0012] Furthermore, in step two, the amount of high-temperature resistant stainless steel wire fiber added in each small forced mixer is less than 20% of the total mass of dry powder.

[0013] Furthermore, in step two, the amount of high-temperature resistant stainless steel wire fiber added to each small forced mixer is 2%-19% of the total mass of the dry powder.

[0014] Furthermore, in step two, the second stirring time is 2-3 minutes.

[0015] The beneficial effects of this invention are as follows: The construction system and method for metal-ceramic composite refractory materials of this invention, by placing the fiber addition step after the initial two-step process, maintains good fluidity of the base material that needs to be transported over long distances, allowing for efficient high-pressure pumping and overcoming the bottleneck of fiber materials being unable to be transported through pipelines. The use of a small mixer accessible through a manhole to complete the crucial second mixing within the furnace perfectly solves the contradiction of limited furnace space and the inability of large equipment to enter or exit. By configuring multiple small mixers to operate in parallel, their total processing capacity matches the pumping capacity of the first step, forming a continuous and efficient production line and avoiding construction interruptions. The design of a central discharge port and a rotating chute enables uniform and slow material distribution to the annular mold, effectively preventing material segregation and ensuring the integrity of the cast body. Attached Figure Description

[0016] To more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the construction system for the metal-ceramic composite refractory material of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention. The technical solutions provided by various embodiments of this invention will be described in detail below with reference to the accompanying drawings.

[0019] Please see Figure 1 This invention provides a construction system for metal-ceramic composite refractory materials, comprising: an external blast furnace tapping platform 1, a large forced mixer 2, a high-pressure pump 3, a conveying pipeline 4, a blast furnace shell 5, a square manhole 6, an internal furnace working platform 7, a small forced mixer 8, a central feeding port 9, a rotatable feeding chute 10, and a furnace wall mold 11.

[0020] The large forced agitator 2 and high-pressure pump 3 are installed on the tapping platform 1 outside the blast furnace, with the blast furnace shell 5 located on one side of the tapping platform 1. A square manhole 6 is located at the top of the blast furnace shell 5, and an in-furnace working platform 7 is located above and inside the blast furnace shell 5. A small forced agitator 8 is installed on the in-furnace working platform 7. The opening size of the square manhole 6 is larger than the size of the small forced agitator 8. Multiple (e.g., four) small forced agitators 8 are hoisted into the furnace through the square manhole 6 at the top of the blast furnace and arranged appropriately on the in-furnace working platform 7. The size of the small forced agitator 8 is smaller than the size of the square manhole 6, solving the problem of space constraints inside the furnace. A high-pressure pump 3 is connected to a small forced mixer 8 via a conveying pipe 4. A central discharge port 9 is located in the middle of the furnace working platform 7. The discharge port of the small forced mixer 8 faces the central discharge port 9. A furnace wall mold 11 is arranged around the furnace wall on the inner wall of the blast furnace shell 5. The top of the rotatable discharge chute 10 is located below the central discharge port 9, and the bottom of the rotatable discharge chute 10 is connected to the furnace wall mold 11. At least three small forced mixers 8 are arranged on the furnace working platform 7. The rotatable discharge chute 10 can rotate 360 ​​degrees about the axis of the blast furnace shell 5.

[0021] Based on the above-mentioned construction system for metal-ceramic composite refractory materials, this invention provides a construction method for metal-ceramic composite refractory materials, used in the above-mentioned construction system for metal-ceramic composite refractory materials, the method comprising: Step 1: On the iron tapping platform outside the blast furnace, the dry powder of composite refractory material and binder (such as water) are placed in a large forced mixer for the first mixing to obtain the matrix castable, which is then transported to the furnace working platform inside the blast furnace shell through a high-pressure pump and conveying pipeline.

[0022] Specifically, no fibers are added at this stage, maintaining the good fluidity of the matrix castable and creating conditions for subsequent high-pressure pumping. The high-pressure pump is started, continuously and stably pumping the mixed matrix castable through the conveying pipeline to the furnace working platform, and then evenly distributing it to each small forced mixer via a material distribution device. The application of high-pressure pumping technology greatly improves material conveying efficiency and is key to achieving high overall construction efficiency. The initial mixing time is 3-5 minutes.

[0023] Step two: The matrix castable material delivered by the conveying pipeline is distributed to the small forced mixers on the working platform inside the furnace. A predetermined amount of high-temperature resistant stainless steel wire fiber is added to each small forced mixer for a second mixing to obtain a uniform metal-ceramic composite refractory material.

[0024] Specifically, the amount of high-temperature resistant stainless steel wire fiber added in each small forced mixer is less than 20% of the total mass of the dry powder. Preferably, the amount of high-temperature resistant stainless steel wire fiber added in each small forced mixer is 2%-19% of the total mass of the dry powder.

[0025] A small forced mixer is started for a second stirring, which lasts for about 2-3 minutes, until the fibers are evenly dispersed in the base material, forming the final metal-ceramic composite refractory material. Adding and dispersing the fibers inside the furnace avoids the problem of reduced flowability caused by fiber entanglement during long-distance transport; the forced stirring of the small forced mixer ensures uniform fiber dispersion, guaranteeing the final performance of the material.

[0026] Step 3: The second batch of mixed metal-ceramic composite refractory material is evenly distributed into the furnace wall mold through the central feeding port set on the working platform inside the furnace and the rotatable feeding chute below it.

[0027] Simultaneously, all small forced mixers are activated to discharge the final mixed composite material into the central discharge port. By controlling the orientation and rotation speed of the rotatable discharge chute, the material flows slowly and evenly into the furnace wall molds arranged around the blast furnace wall. The central discharge port collects all the material, and combined with the 360-degree rotatable discharge chute, precise and uniform material distribution to the annular molds is achieved. After casting, subsequent treatment is carried out according to the standard curing and baking regime for refractory materials, ultimately forming a high-performance metal-ceramic composite refractory lining.

[0028] In summary, this invention, through the aforementioned system and method, successfully solves the problems of poor fluidity, inability to pump, and limited space encountered in the construction of linings for large metallurgical equipment such as blast furnaces using composite refractory materials containing metal fibers, thereby achieving efficient and high-quality construction.

[0029] The embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention.

Claims

1. A construction system for a metal-ceramic composite refractory material, characterized in that, include: The blast furnace external tapping platform (1), large forced mixer (2), high pressure pump (3), conveying pipeline (4), blast furnace shell (5), square manhole (6), furnace internal working platform (7), small forced mixer (8), central feeding port (9), rotatable feeding chute (10), and furnace wall mold (11). The large forced mixer (2) and the high-pressure pump (3) are installed on the iron tapping platform (1) outside the blast furnace. The blast furnace shell (5) is installed on one side of the iron tapping platform (1) outside the blast furnace. The square manhole (6) is installed on the top of the blast furnace shell (5). The furnace working platform (7) is installed inside the blast furnace shell (5) above it. The small forced mixer (8) is installed on the furnace working platform (7). The high-pressure pump (3) is connected to the conveying pipeline. (4) Connected to the small forced mixer (8), the central discharge port (9) is located in the middle of the furnace working platform (7), the discharge port of the small forced mixer (8) faces the central discharge port (9), the furnace wall mold (11) is arranged around the furnace wall on the inner wall of the blast furnace shell (5), the top of the rotatable discharge chute (10) is located below the central discharge port (9), and the bottom of the rotatable discharge chute (10) is connected to the furnace wall mold (11).

2. The construction system for a metal-ceramic composite refractory material according to claim 1, characterized in that, At least three small forced mixers (8) are arranged on the furnace working platform (7).

3. The construction system for a metal-ceramic composite refractory material according to claim 1, characterized in that, The opening size of the square manhole (6) is larger than the size of the small forced mixer (8).

4. The construction system for a metal-ceramic composite refractory material according to claim 1, characterized in that, The rotatable feeding chute (10) can rotate 360 ​​degrees around the axis of the blast furnace shell (5).

5. A construction method for a metal-ceramic composite refractory material, used in the construction system of the metal-ceramic composite refractory material according to claim 1, characterized in that, The method includes: Step 1: On the iron tapping platform outside the blast furnace, the dry powder of composite refractory material and binder are placed in a large forced mixer for the first mixing to obtain the matrix castable, which is then transported to the furnace working platform inside the blast furnace shell through a high-pressure pump and conveying pipeline. Step 2: Distribute the matrix castable material delivered by the conveying pipeline to the small forced mixers on the working platform inside the furnace. Add a predetermined amount of high-temperature resistant stainless steel wire fiber to each small forced mixer and carry out a second mixing to obtain a uniform metal-ceramic composite refractory material. Step 3: The second batch of mixed metal-ceramic composite refractory material is evenly distributed into the furnace wall mold through the central feeding port set on the working platform inside the furnace and the rotatable feeding chute below it.

6. The construction method of a metal-ceramic composite refractory material according to claim 5, characterized in that, In step one, the first stirring time is 3-5 minutes.

7. The construction method of a metal-ceramic composite refractory material according to claim 5, characterized in that, In step two, the amount of high-temperature resistant stainless steel wire fiber added to each small forced mixer is less than 20% of the total mass of dry powder.

8. The construction method of a metal-ceramic composite refractory material according to claim 7, characterized in that, In step two, the amount of high-temperature resistant stainless steel wire fiber added to each small forced mixer is 2%-19% of the total mass of dry powder.

9. The construction method of a metal-ceramic composite refractory material according to claim 5, characterized in that, In step two, the second stirring time is 2-3 minutes.

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