Masonry structure of steel ladle heat insulation material

Abstract

The utility model relates to the technical field of molten steel storage and transportation equipment, in particular to a masonry structure of a steel ladle heat insulation material. The structure comprises a refractory material lining body located in a steel shell, the refractory material lining body comprises a heat insulation lining, a permanent lining and a working lining, the heat insulation lining is a high-strength heat insulation plate, and the permanent lining is a high-strength heat insulation brick; the high-strength heat insulation plate is built on the inner wall of the steel shell through bonding fire clay; the high-strength heat-insulating bricks are built on one side of the hot surface of the high-strength heat-insulating plate through bonding fire clay; and the working lining is built on one side of the hot surface of the high-strength heat-insulating brick. While heat loss of molten steel is effectively isolated and the temperature of the steel ladle shell is reduced, the overall stability of the steel ladle lining can be ensured, and the technical problems that the steel ladle working lining falls off, production is influenced, and the service life of the steel ladle is short are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of molten steel storage and transportation equipment, in particular to a masonry structure of heat insulation material for a molten steel ladle. Background Art

[0002] With the continuous advancement of smelting technology, the role of the ladle has evolved from simply receiving molten steel to a furnace that also performs a range of smelting functions. Molten steel in the ladle undergoes long-term circulation and residence times in various processes, including tapping, LF refining (Ladle Furnace), RH refining (Ruhrstahl-Heraeus), VD refining (Vacuum Degassing), CAS-OB refining (Composition Adjustment by Sealed Argon Bubbling with Oxygen Blowing), and AOD refining. These processes inevitably cause the molten steel to lose temperature, affecting casting quality and increasing production costs.

[0003] To address these issues, insulated ladles are increasingly becoming a requirement for steel mills. For example, patent publication number CN212704336U discloses an insulated ladle comprising an inner shell and an outer shell. The inner and outer shells enclose a hollow layer filled with aerogel felt, topped with a cover plate. The inner shell's inner wall is sequentially inwardly provided with an insulation layer, a permanent layer, and a working layer. The insulation layer is made of asbestos board or hard fiber insulation board, the permanent layer is cast from a high-alumina casting material, and the working layer is paved with magnesia-carbon bricks.

[0004] It can be seen that the above-mentioned ladle is provided with an insulating layer and a sandwich layer, which are combined to form two layers of insulation, thereby improving the thermal insulation capacity of the ladle and reducing heat loss during the production process. However, the permanent layer of the above-mentioned ladle is cast from high-aluminum casting material, and the working layer is paved with magnesia carbon bricks. It is inevitable that they will expand due to heat during use. The insulation layer is made of asbestos board or hard fiber insulation board, which has low strength and cannot withstand the expansion pressure of the permanent layer and working layer. As a result, the insulation layer is worn or crushed during the transportation of the ladle, causing the permanent layer and working layer to fall off, requiring major repairs to the ladle, which greatly reduces the service life of the ladle. Utility Model Content

[0005] The utility model provides a masonry structure of heat insulation material for a molten steel ladle, which can effectively isolate the heat loss of molten steel and reduce the temperature of the ladle shell, while ensuring the overall stability of the lining of the molten steel ladle, so as to avoid the technical problem of the ladle working lining falling off, affecting production and shortening the service life of the ladle.

[0006] In order to solve the above problems, the masonry structure of the ladle insulation material provided by the present invention adopts the following technical solutions:

[0007] A masonry structure of ladle insulation material, comprising a refractory lining located inside a steel shell, the refractory lining comprising an insulating lining, a permanent lining and a working lining, the insulating lining being a high-strength insulating board, and the permanent lining being a high-strength insulating brick;

[0008] The high-strength heat-insulating board is built on the inner wall of the steel shell by bonding fire mud;

[0009] The high-strength insulation bricks are laid on one side of the hot surface of the high-strength insulation board by bonding fire mud;

[0010] The working lining is built on one side of the hot surface of the high-strength insulation bricks.

[0011] The masonry structure of the ladle insulation material provided by the utility model has the following beneficial effects: high-strength insulation boards are used as insulation linings, and high-strength insulation bricks are used as permanent linings. The high-strength insulation boards and high-strength insulation bricks are used to utilize the characteristics of ultra-high service temperature, low and stable thermal conductivity, zero compression rate, ultra-high strength, and ultra-high volume density. While effectively isolating the heat loss of molten steel and reducing the temperature of the ladle shell, the performance stability of the material under service conditions and the safety of the masonry structure can be ensured, so that the working lining of the ladle will not fall off and affect production. In addition, the high-strength insulation bricks are shaped products and are easy to lay and dismantle, which can reduce the difficulty of laying and dismantling.

[0012] Through the above arrangement, the utility model effectively solves the technical problem in the prior art that the insulation layer of the ladle has low strength and is unable to resist the expansion pressure of the permanent layer and the working layer, resulting in a short service life of the ladle.

[0013] Furthermore, the high-strength heat insulation board has a thickness of 5-50 mm, a length of 200-500 mm, and a width of 50-300 mm.

[0014] Furthermore, the high-strength insulation brick has a thickness of 50-150 mm, a length of 150-500 mm, and a width of 50-200 mm.

[0015] Furthermore, the working lining includes a slag line area, a transition area and a wall area from top to bottom.

[0016] Furthermore, the heights of the slag line area and the wall area are both greater than the height of the transition area.

[0017] Furthermore, a rim castable is provided on the top of the slag line area.

[0018] Furthermore, the working lining is refractory bricks.

[0019] The beneficial effects of the masonry structure of the ladle insulation material provided by the utility model are as follows: high-strength insulation boards are used as insulation linings, and high-strength insulation bricks are used as permanent linings. The reliability of the bonding between two adjacent layers of linings is ensured by bonding fire mud. The characteristics of high-strength insulation boards and high-strength insulation bricks, such as ultra-high service temperature, low and stable thermal conductivity, zero compression rate, ultra-high strength, and ultra-high volume density, are utilized to effectively isolate the heat loss of molten steel and reduce the temperature of the ladle shell. At the same time, the stability of the material performance under service conditions and the safety of the masonry structure are ensured, so that the working lining of the ladle will not fall off and affect production.

[0020] Through the above arrangement, the utility model effectively solves the technical problem in the prior art that the insulation layer of the ladle has low strength and is unable to resist the expansion pressure of the permanent layer and the working layer, resulting in a short service life of the ladle. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic structural diagram of the masonry structure of the ladle insulation material provided by the present invention;

[0022] Figure 2 for Figure 1 A local enlarged schematic diagram of point A in the middle.

[0023] Description of reference numerals:

[0024] 1. Steel shell; 2. High-strength insulation board; 3. High-strength insulation brick; 4. Slag line area; 5. Transition area; 6. Wall area; 7. Edge casting material. DETAILED DESCRIPTION

[0025] The embodiment of the masonry structure of the ladle insulation material provided by the utility model:

[0026] like Figure 1 and Figure 2 As shown, the masonry structure of the ladle insulation material includes a refractory lining located inside the steel shell 1, and the refractory lining includes an insulating lining, a permanent lining and a working lining.

[0027] Among them, the thermal insulation lining is a high-strength thermal insulation board 2, and the permanent lining is a high-strength thermal insulation brick 3; the high-strength thermal insulation board 2 is built on the inner wall of the steel shell 1 by bonding fire mud; the high-strength thermal insulation brick 3 is built on one side of the hot surface of the high-strength thermal insulation board 2 by bonding fire mud; the working lining is built on one side of the hot surface of the high-strength thermal insulation brick 3.

[0028] In this embodiment, the bonding fireclay is a high-strength heat-insulating fireclay base material; the so-called hot surface refers to the high and low temperature distribution of the refractory material lining along the radial direction of the steel shell 1 under the working conditions.

[0029] Regarding the high-strength insulation board 2. The physical properties of the high-strength insulation board 2 are: compressive strength ≥ 10MPa, bulk density ≥ 1.8g / cm 3 , thermal conductivity ≤ 0.35W / (m·K), maximum service temperature ≥ 1450℃. When testing the thermal conductivity of the high-strength insulation board 2, the flat plate method was used at a temperature of 350℃ for a volume density of 1.8g / cm 3 The high-strength heat insulation board 2 was tested and its thermal conductivity was found to be 0.35 W / (m·K). The high-strength heat insulation board 2 has a thickness of 5-50 mm, a length of 200-500 mm, and a width of 50-300 mm.

[0030] About high-strength insulation brick 3. The physical properties of high-strength insulation brick 3 are: compressive strength ≥30MPa, bulk density ≥2.2g / cm 3 , thermal conductivity ≤ 0.4W / (m·K), line change rate after burning (burning at 1450℃ for 3 hours) ±1.0%, maximum service temperature ≥ 1450℃. When testing the thermal conductivity of high-strength insulating brick 3, the flat plate method was used at a temperature of 350℃ for a volume density of 2.2g / cm 3 The high-strength insulation brick 3 was tested and its thermal conductivity was found to be 0.4 W / (m·K). The high-strength insulation brick 3 has a thickness of 50-150 mm, a length of 150-500 mm, and a width of 50-200 mm.

[0031] About working lining. Figure 1 As shown, the working lining is refractory bricks, which include a slag line area 4, a transition area 5 and a wall area 6 from top to bottom. The heights of the slag line area 4 and the wall area 6 are both greater than the height of the transition area 5, and a rim castable 7 is provided on the top of the slag line area 4.

[0032] It should be noted that in this embodiment, when constructing the ladle insulation material masonry structure, wet masonry is adopted, that is, first, a high-strength thermal insulation fireclay base material is applied to the inner wall of the steel shell 1, and then the high-strength thermal insulation board 2 is masoned on the high-strength thermal insulation fireclay base material to ensure that the high-strength thermal insulation board 2 is firmly bonded to the inner wall of the steel shell 1; after the high-strength thermal insulation board 2 is completed, the high-strength thermal insulation brick 3 is masoned on one side of the hot surface of the high-strength thermal insulation board 2 using the high-strength thermal insulation fireclay base material to ensure that the high-strength thermal insulation brick 3 is firmly bonded to the high-strength thermal insulation board 2; after the high-strength thermal insulation brick 3 is completed, the working lining is masoned on one side of the hot surface of the high-strength thermal insulation brick 3 to ensure that the working lining is firmly bonded to the high-strength thermal insulation board 2. By following the above steps, the masonry structure of the ladle insulation material provided by the present invention can be obtained.

[0033] The performance of the masonry structure of the ladle insulation material provided by the present invention is illustrated below with reference to specific test results. Table 1 shows the temperature test results of the slag line area 4, transition area 5, and ladle wall area 6 during service for a ladle with a conventional ladle wall solution (ordinary insulation board + permanent lining castable + working lining bricks), i.e., a ladle without high-strength insulation board 2 and high-strength insulation bricks 3.

[0034] Table 1

[0035]

[0036] As shown in Table 1, the average temperature in the slag line area 4 of ladles without high-strength insulation boards 2 and high-strength insulation bricks 3 was above 300°C. However, the average temperature in the slag line area 4 of ladles with high-strength insulation boards 2 and high-strength insulation bricks 3 was between 200°C and 280°C, a decrease of 50°C to 100°C compared to the average temperature in the slag line area 4 of ladles without high-strength insulation boards 2 and high-strength insulation bricks 3. The average temperature in the transition area 5 and ladle wall area 6 of ladles with high-strength insulation boards 2 and high-strength insulation bricks 3 decreased by 50°C to 120°C.

[0037] It can be seen that the masonry structure of the ladle insulation material provided by the present invention maintains good condition during the service life. The average temperature of the ladle in the slag line area 4, transition area 5, and ladle wall area 6 is lower than the temperature in the corresponding areas of the ladle without the high-strength insulation board 2 and high-strength insulation brick 3. This shows that the high-strength insulation board 2 and high-strength insulation brick 3 provide good protection for the ladle.

[0038] To sum up, the masonry structure of the ladle insulation material provided by the utility model is a new double-layer energy-saving thermal insulation structure. On the one hand, the high-strength insulation board 2 as the insulation lining has the characteristics of good thermal stability, zero compression ratio, high strength, high heat resistance and low bulk density, so that the insulation lining has the advantages of safe and reliable application, complete structure and long service life; on the other hand, the high-strength insulation brick 3 as the permanent lining has the characteristics of low thermal conductivity, high strength, standardized products, easy masonry and dismantling, and protection of the insulation material from excessive pressure; therefore, the masonry structure of the ladle insulation material provided by the utility model can effectively isolate the heat loss of molten steel and reduce the temperature of the ladle shell while ensuring the overall stability of the ladle lining, so as to prevent the working lining of the ladle from falling off and affecting production, resulting in the technical problem of short ladle life.

[0039] The working principle of the masonry structure of the ladle insulation material provided by the present invention is: during storage and transportation, the molten steel in the ladle first contacts the working lining and transfers its heat to the working lining; then, the high-strength insulation bricks 3 built on the periphery of the working lining play a preliminary insulation role in the outward transfer of heat, thereby achieving the purpose of preliminary thermal insulation; thereafter, the high-strength insulation board 2 built on the periphery of the high-strength insulation bricks 3 further hinders the outward transfer of heat, thereby achieving the purpose of double thermal insulation, and ultimately the temperature of the steel shell 1 using the masonry structure of the ladle insulation material is greatly reduced compared to the temperature of an ordinary steel shell 1.

[0040] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the drawings of this specification. They are only for the purpose of facilitating the explanation of the scheme of the utility model and simplifying the description, rather than explicitly or implicitly indicating that the devices or elements involved must have the specific directions, be constructed and operated in a specific directions. Therefore, the above-mentioned directions or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the utility model.

Claims

1. A masonry structure of ladle insulation material, comprising a refractory lining located inside a steel shell, the refractory lining comprising an insulating lining, a permanent lining and a working lining, characterized in that: The thermal insulation lining is a high-strength thermal insulation board, and the permanent lining is a high-strength thermal insulation brick; The high-strength heat-insulating board is built on the inner wall of the steel shell by bonding fire mud; The high-strength insulation bricks are laid on one side of the hot surface of the high-strength insulation board by bonding fire mud; The working lining is built on one side of the hot surface of the high-strength insulation bricks.

2. The masonry structure of the ladle insulation material according to claim 1, characterized in that: The high-strength heat-insulating board has a thickness of 5-50 mm, a length of 200-500 mm, and a width of 50-300 mm.

3. The masonry structure of the ladle insulation material according to claim 2, characterized in that: The high-strength thermal insulation brick has a thickness of 50-150 mm, a length of 150-500 mm, and a width of 50-200 mm.

4. The masonry structure of the ladle insulation material according to any one of claims 1 to 3, characterized in that: The working lining includes a slag line area, a transition area and a wall area from top to bottom.

5. The masonry structure of the ladle insulation material according to claim 4, characterized in that: The heights of the slag line area and the wall area are both greater than the height of the transition area.

6. The masonry structure of the ladle insulation material according to claim 4, characterized in that: The top of the slag line area is provided with an edge-wrapped castable.

7. The masonry structure of the ladle insulation material according to any one of claims 1 to 3, characterized in that: The working lining is refractory bricks.

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