A masonry arc furnace door frame structure

Abstract

The utility model provides a kind of masonry electric arc furnace door frame structure, belong to foundry equipment technical field.The electric arc furnace door frame structure is: the furnace door frame includes side wall and door frame top, door frame top is on the side wall of both sides, side wall is formed by furnace wall body continuous masonry, door frame top is divided into two layers, by long brick, lower heat insulation lining, middle support layer and upper heat insulation lining paving, lower layer is for multiple long brick to be on the side wall of both sides, upper layer aligns lower layer according to by the direction of furnace from outside Paving a long brick, closely long brick sequentially lays lower heat insulation lining, middle support layer and upper heat insulation lining, wherein, middle support layer is by heat insulation strip, inner support plate, middle heat insulation strip and outer support plate.The furnace door frame is masonry with furnace, simple structure, masonry is easy, material cost is relatively lower, laminated structure provides necessary structural strength and excellent heat insulation performance, reduces smelting process heat loss, improves the security of smelting operation.

Description

Technical Field

[0001] This utility model relates to the field of casting equipment technology, specifically an electric arc furnace door frame structure, and more particularly a masonry electric arc furnace door frame structure constructed using heat-resistant materials. Background Technology

[0002] Traditional electric arc furnace door frames typically employ a metal water-cooled frame structure, which has the following significant drawbacks: High safety risks: When exposed to high temperatures and thermal shock for extended periods, the metal frame is prone to deformation, cracking, or even burn-through, which can lead to cooling water leaks and safety accidents, posing a high safety risk. Large heat loss: The metal water-cooling frame itself is a good heat conductor, which will cause considerable heat loss, and the water-cooling system consumes a lot of energy; Poor overall integrity with the furnace body: Gaps and thermal bridges exist between the independent metal door frame and the masonry furnace wall, affecting the furnace body's sealing and insulation performance, and disassembling the furnace door can easily damage the surrounding furnace lining.

[0003] Therefore, there is an urgent need for an electric arc furnace door structure that is safer, simpler in structure, relatively lower in cost, easier to maintain, and more tightly integrated with the furnace body. Utility Model Content

[0004] The technical problem to be solved by this utility model To address the shortcomings of existing metal water-cooled frame electric arc furnace door frames, such as easy deformation and damage, high safety risks, large heat loss, and difficult daily maintenance, this utility model provides a masonry-type electric arc furnace door frame structure. This structure abandons the traditional metal water-cooled frame structure, and is completely constructed together with the furnace wall, offering advantages such as high safety, simple structure, convenient construction, low heat loss, and convenient daily maintenance and repair.

[0005] Technical solution of this utility model To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A masonry-type electric arc furnace door frame structure, characterized in that: Furnace door frame side walls 1: The two side walls 1 of the furnace door frame are formed by continuous masonry of the furnace wall, eliminating the need for an independent metal door frame structure.

[0006] The furnace door frame top 2 consists of two layers. The lower layer is made of multiple bottom strip bricks 3, which are directly overlapped parallel to each other on the side walls 1. The upper layer is aligned with the lower layer and laid with a strip brick 3 from the inside of the furnace outwards. The lower insulation lining 4, the intermediate support layer 5, and the upper insulation lining 6 are then laid sequentially from bottom to top, closely adjacent to the strip bricks 3. This layered structure provides the necessary structural strength and excellent thermal insulation performance.

[0007] The intermediate support layer 5 structure: The intermediate support layer 5 is closely attached to the long strip brick 3 and the heat insulation strip 51, inner support plate 53, middle heat insulation strip 52 and outer support plate 54 are laid flat in sequence from the inside to the outside (i.e. from the high temperature side of the furnace to the furnace shell side).

[0008] The components of each layer of the top 2 of the door frame are densely filled with high-alumina refractory mortar.

[0009] Preferred embodiment: The sum of the thicknesses of the lower insulation lining 4, the intermediate support layer 5, and the upper insulation lining 6 is an integer multiple of the thickness of the bricks used for furnace wall construction. The thickness and width of the long strip bricks 3 are the same as those used for furnace wall construction. The lower insulation lining 4, the upper insulation lining 6, the insulation strip 51, and the intermediate insulation strip 52 are all made of graphite felt. The inner support plate 53 and the outer support plate 54 are made of high-temperature resistant alloy steel. The long strip bricks 3 are made of magnesia-carbon bricks.

[0010] Beneficial effects of this utility model Compared with the prior art, the masonry-type electric arc furnace door frame structure of this utility model has the following significant advantages: High safety: It eliminates the risk of high-pressure cooling water leakage and explosion caused by easy deformation and burn-through of the metal furnace door frame. The heat-resistant steel support plate and graphite felt lining have excellent thermal shock resistance and high temperature resistance, and the structure is stable. Simple structure and easy to build: It completely eliminates the complex metal frame and water cooling system. The side walls of the furnace door are built as a whole with the furnace wall. The top of the door frame is built with prefabricated heat insulation lining and support layer. The construction is convenient and the technical requirements for workers are relatively low. Low heat loss and good thermal insulation performance: High-efficiency thermal insulation materials such as graphite felt are used, and the top of the door frame adopts a multi-layer thermal insulation structure (upper thermal insulation lining, lower thermal insulation lining, and middle thermal insulation strip), which effectively blocks heat from being transferred outward and improves thermal efficiency.

[0011] Easy to maintain and long service life: No complex water cooling system requires maintenance. The furnace door, as part of the furnace lining, can be repaired or replaced simultaneously during furnace lining overhauls, with maintenance cycles consistent with those of the furnace lining.

[0012] Good overall integrity: The furnace door and furnace wall are seamlessly connected, with no thermal bridges or installation gaps, which improves the overall sealing and heat preservation of the furnace body. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is a schematic diagram of the overall appearance of the furnace door frame after its completion. Figure 2 This is a cross-sectional structural schematic diagram of the present invention; Figure 3 This is a schematic diagram of the upper structure of the door top frame of this utility model.

[0015] In the diagram: 1—side wall, 2—top of door frame, 3—long brick, 4—lower insulation lining, 5—intermediate support layer, 6—upper insulation lining, 51—insulation strip, 52—intermediate insulation strip, 53—inner support plate, 54—outer support plate. Detailed Implementation

[0016] This embodiment provides a masonry-type electric arc furnace door frame structure, applicable to 3-10 ton electric arc furnaces. For example... Figure 1 , Figure 2 and Figure 3 As shown, the specific construction steps are as follows: 1. Composition and Material Selection of Furnace Door Structure Sidewall 1: It is formed by continuous masonry of the furnace wall, and the material is magnesia-carbon brick, which is consistent with the main material of the furnace wall to ensure integrity and structural stability.

[0017] Door frame top 2: Divided into two layers, from bottom to top as follows: Lower layer: multiple long bricks 3.

[0018] Lay a layer of magnesia-carbon bricks, with the same thickness and width as the bricks used for furnace wall construction, and a thickness of 100mm. Upper layer: Consists of a long strip brick 3, a lower insulation lining 4, an intermediate support layer 5, and an upper insulation lining 6.

[0019] The lower insulation liner 4 is 40mm thick, the upper insulation liner 6 is 30mm thick, and the middle support layer 5 is 30mm thick. The total thickness of these three components is 100mm. The width of the heat insulation strip 51 and the intermediate heat insulation strip 52 in the intermediate support layer 5 is 20mm.

[0020] Ensure that the dimensions of the upper and lower components in other directions are secure and that all edges are aligned.

[0021] The following are the component material selections: Thermal insulation materials: The lower thermal insulation lining 4, the upper thermal insulation lining 6, the thermal insulation strip 51, and the middle thermal insulation strip 52 are all made of high-purity graphite felt with a density ≥180kg / m³ and a long-term temperature resistance ≥1800℃.

[0022] Support plates: The inner support plate 53 and the outer support plate 54 are made of austenitic high-temperature resistant alloy steel ZG3Cr26Ni48W5, which has excellent high-temperature strength (especially creep and endurance strength), oxidation resistance, carburization resistance and certain thermal fatigue resistance, and can work for a long time at 1000℃ - 1200℃.

[0023] 2. Masonry steps Side wall construction: When constructing the furnace wall, magnesia-carbon bricks are used to construct the furnace wall simultaneously with the furnace door frame to form the vertical side walls on the left and right sides of the furnace door frame, namely side wall 1, ensuring that the side wall is seamlessly connected to the furnace wall.

[0024] Door frame top masonry: Lower layer of long strip bricks 3: Lay a layer of magnesia-carbon bricks on the top of the furnace door frame, and fill the brick joints tightly with refractory mortar.

[0025] Upper layer: Align with the lower layer, and lay a long strip brick 3 on the lower layer of long strip bricks in the direction from the inside of the furnace outwards. Lay the lower insulation lining 4 flat against the upper and lower long strip bricks 3. On the lower insulation lining 4, lay the insulation strip 51, inner support plate 53, middle insulation strip 52 and outer support plate 54 flat against the upper layer of long strip bricks 3. Finally, cover with the upper insulation lining 6. Ensure that each layer and each edge is aligned, and fill the gaps tightly with refractory mortar.

[0026] Overall inspection: Check whether the masonry of each layer is flat and ensures that there are no gaps.

[0027] The furnace door opening and closing mechanism (such as a hydraulic push rod) acts directly on the heat-resistant steel hinge seat pre-installed outside the furnace body (not shown in the figure).

[0028] This masonry furnace door frame structure not only solves the safety hazards of traditional metal frame furnace door frames, but also significantly improves insulation performance and ease of maintenance, making it suitable for upgrading or new construction projects of various electric arc furnaces.

Claims

1. A masonry-type electric arc furnace door frame structure, comprising two side walls (1) and a door frame top (2) overlapping the side walls, characterized in that: The side wall (1) and the furnace wall are integrally constructed of the same material. The top of the door frame (2) includes a lower layer and an upper layer. The lower layer is composed of multiple long strip bricks (3) laid flat. The upper layer includes long strip bricks (3), lower heat insulation lining (4), middle support layer (5) and upper heat insulation lining (6) laid in sequence. The middle support layer (5) consists of heat insulation strip (51), inner support plate (53), middle heat insulation strip (52) and outer support plate (54) from the inside to the outside.

2. The furnace door frame structure of a masonry electric arc furnace according to claim 1, characterized in that: The sum of the thicknesses of the lower insulation lining (4), the intermediate support layer (5), and the upper insulation lining (6) is 1-2 times the thickness of the bricks used for furnace wall construction. The thickness and width of the long strip bricks (3) are the same as those used for furnace wall construction.

3. The furnace door frame structure of a masonry electric arc furnace according to claim 1, characterized in that: The upper heat insulation lining (6), lower heat insulation lining (4), heat insulation strip (51), and middle heat insulation strip (52) are made of graphite material, the inner support plate (53) and outer support plate (54) are made of high-temperature resistant metal material, and the long strip brick (3) is made of refractory brick.

4. The door frame structure of a masonry electric arc furnace according to claim 1, characterized in that: The components of the top (2) of the door frame are densely filled with high-alumina refractory mortar.

Images