CN201819559U - electric furnace cover - Google Patents

Abstract

The utility model provides an electric furnace cover, which comprises a central cover plate (10) and a plurality of water-cooled cover plates (20) located around the central cover plate (10), characterized in that: the central cover plate (10 ) is provided with a flange connector (11) on the edge, and the water-cooled cover plate (20) is equipped with A flange connection piece (21), the central cover plate and the water-cooling cover plate and between each of the water-cooling cover plates are fastened through the flange connection piece. The electric furnace cover of the utility model has high strength, good sealing performance, light weight and convenient maintenance.

Description

electric furnace cover

technical field

The utility model relates to a metallurgical electric furnace component, in particular to a furnace cover of a metallurgical electric furnace.

Background technique

In recent years, with the development of the iron and steel industry and the advancement of science and technology, the production of ferroalloys in the world has experienced rapid development and breakthroughs in terms of varieties, smelting processes, technical equipment, environmental protection, energy recovery and comprehensive utilization of resources. The ferroalloy electric furnace is also developing in the direction of large-scale and closed furnace smelting

Most of the large and medium reduction electric furnaces that smelt high-carbon ferromanganese, manganese-silicon alloy and high-carbon ferrochrome through electric furnaces use fully enclosed electric furnaces or transform the open furnaces into fully enclosed electric furnaces. The use of closed electric furnaces to smelt ferroalloys can greatly reduce the energy consumption of products. By recovering the gas produced in the smelting process and treating the sewage. The recovered coal gas (CO accounts for 60%-80%, calorific value 8-10KJ/m3 (standard state), gas production is about 900-1200m3/t (standard state)) is used for drying or for preheating and reducing ore, Thereby reducing the power consumption of smelting and realizing the comprehensive utilization of secondary energy. The furnace cover is an important part of the closed electric furnace. Its structural form has a great influence on the economic and technical indicators of the closed furnace.

According to investigations, the structure of the furnace cover used in the closed electric furnace smelting ferroalloy products in the prior art is mostly a hybrid structure. The hybrid furnace cover adopts a water-cooled skeleton, and refractory concrete is knotted or covered with a water-cooled cover plate. The furnace cover is frustum-shaped, and the horizontal surface in the middle is equipped with electrode sealing holes and material tube sealing holes. Each cover plate of the furnace cover is equipped with explosion-proof devices and observation doors. A flue gas outlet pipe is installed on the furnace cover to guide the furnace gas into the dust removal system or into the atmosphere. The clearance of the furnace cover is usually 1.5-1.7m.

The structural form of the traditional electric furnace cover device is shown in Figure 1. The upper figure in Figure 1 is a section view of the furnace cover, and the lower figure is a top view of the furnace cover. The structure of the traditional furnace cover is relatively delicate, which can effectively recover the electric furnace smelting process the energy produced in. But at present, with the development of ferroalloy electric furnace towards large-scale. The traditional furnace cover has gradually revealed the following shortcomings in the process of use:

1. Low equipment strength. Since the traditional furnace cover adopts a fixed water-cooled frame structure, the entire weight of the furnace cover plate and a part of the weight of the electrode itself are mainly supported on the water-cooled frame. The enlargement of the ferroalloy electric furnace will inevitably lead to an increase in the overall size of the equipment and an increase in the weight of the equipment itself. In order to ensure the clearance height in the furnace cover, to enable the smooth discharge of furnace gas and to ensure the smooth removal of broken electrodes when dealing with electrode accidents, the water-cooled frame should not be too large. In this way, due to the increase of the weight of the cover plate and the electrode, the load-bearing strength of the furnace cover frame is increased, but the furnace cover frame cannot be enlarged at will, which will inevitably cause the strength of the furnace cover to decrease.

2. It is not easy to dig out the broken electrode part inside the furnace body. Due to the large-scale development of ferroalloy electric furnaces, the diameter of the electrodes has increased, and the pole center circle has also increased accordingly. This will inevitably cause the components on the upper part of the furnace cover to be more closely arranged, so that when the electrode breaks, it is not easy to dig out and enter the space of the broken electrode part inside the furnace body. Furthermore, due to the water-cooled fixed framework, the height of the furnace cover cannot be too high. When the diameter of the electrode increases, it will inevitably hinder the removal of the broken electrode. In the past, there are usually two ways to solve this difficulty in large closed electric furnaces: one is to directly fry the electrode shell, and then take it out. The disadvantage of using this method is that it is easy to damage the furnace cover, undamaged electrodes and other electric furnace equipment, and there are certain safety hazards; another method is to directly remove a whole cover plate, and then pull out the short cracked ones Electrodes, the disadvantage of using this method is that the operation is more difficult, time-consuming, and affects production.

Contents of the invention

The purpose of the utility model is to solve the above-mentioned shortcomings of the prior art, and provide a structure-improved electric furnace cover.

The electric furnace cover of the utility model includes a central cover plate and a plurality of water-cooled cover plates located around the central cover plate, flange connectors are arranged on the edge of the central cover plate, and the water-cooled cover plates are connected to the Flange joints are provided on the edge of the central cover plate and on the edge of the joint with other water-cooling cover plates. The blue connectors are fastened and connected, and the water-cooled skeleton support form of the traditional furnace cover is not used.

In another embodiment, an opening is provided on at least one of the plurality of water-cooled cover plates, and the electric furnace cover further includes an opening cover plate matching the shape of the opening, and the opening cover plate The joint with the water-cooled cover plate is connected by a pin shaft.

The furnace cover of the utility model adopts the structural form of turning up the beam, and each flange connecting piece is located above the furnace cover of the electric furnace.

The lower surfaces of the central cover plate and the water-cooled cover plate both have refractory material layers.

When the electric furnace cover includes an open cover plate, the lower surfaces of the central cover plate, the water-cooled cover plate and the open cover plate are all sprayed with refractory materials.

Connecting holes are formed at the same position of each flange connecting piece.

Although the electric furnace cover of the utility model does not adopt the water-cooled skeleton support form of the traditional cover, the flange connectors constitute the beam of the cover, so the cover is low in height, good in sealing performance and light in weight. And the open cover plate can be used, so when the electrode breaks, you only need to remove the partial open cover plate to take out the broken electrode smoothly. This scheme is easy to operate and greatly reduces the operation time, so it has a greater impact on production Small.

Description of drawings

Fig. 1 is a structural schematic diagram of an electric furnace cover in the prior art.

Fig. 2 is a top view of the structure of the electric furnace cover of the utility model.

Fig. 3 is a schematic diagram of the flange connection between the central cover plate and the water-cooled cover plate of the present invention.

Detailed ways

Preferred embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings.

Fig. 2 is a schematic structural view of the electric furnace cover of the present invention. As shown in the figure, the electric furnace cover of the present utility model includes a central cover plate 10 and a plurality of water-cooled cover plates 20, wherein the edge of the central cover plate 10 is provided with a flange connector, and the water-cooled cover plate 20 is connected to the central cover plate 10 and other water-cooling cover plates 20 are provided with flange joints, and the center cover 10 and water-cooling cover plates 20 and between each water-cooling cover plate 20 are tightly connected by flange joints. Fixed connection. Preferably, both the lower surfaces of the central cover plate 10 and the water-cooled cover plate 20 have refractory material layers.

Although the opening cover plate 30 is shown in FIG. 2 , the electric furnace cover of the present invention can omit the opening cover plate 30 .

In one embodiment, at least one water-cooled cover plate 20 is provided with an opening, and the electric furnace cover also includes an opening cover plate 30 matching the shape of the opening, and the joint between the opening cover plate 30 and the water-cooling cover plate 20 Connected by bolts. When the electric furnace is working, the central cover plate 10, the water-cooled cover plate 20 and the opening cover plate 30 together form a complete electric furnace cover and close the space in the furnace. An opening of an appropriate size can be selected according to the size of the electrode, so that the electrode can be taken out smoothly. When the electrode in the furnace breaks, the bolt can be unscrewed and the opening cover plate 30 can be removed to take out the broken electrode or perform other maintenance work.

The opening cover plate 30 and the water-cooling cover plate 20 can also be connected by a pin shaft. The advantage of the pin shaft connection is that when the opening cover plate 30 is reinstalled, even if there is a deviation in the positioning between the opening cover plate 30 and the water-cooling cover plate 20 , can also smoothly connect the opening cover plate 30 and the water-cooling cover plate 20 . Those skilled in the art may also know other suitable connection methods between the opening cover plate 30 and the water-cooling cover plate 20 .

Although six water-cooling cover plates 20 and two opening cover plates 30 are shown in the figure, and the opening cover plates are located at the periphery of the water-cooling cover plates, those skilled in the art can select the number of water-cooling cover plates 20 and the opening covers according to actual needs. Number and location of plates 30 .

FIG. 3 is a schematic diagram of the flange connection between the central cover plate 10 and the water-cooled cover plate 20 of the present invention. Preferably, as shown in FIG. 3 , each flange connector is located above the furnace cover, for example, a flange connector 11 is provided on the edge of the central cover plate 10, and a flange is provided on the corresponding edge of the water-cooled cover plate 20. The connecting piece 21 and the flange connecting piece 11, 21 are formed with connecting holes at the same position. When the water-cooled cover plate 20 and the central cover plate 10 are to be connected, the adjacent flange connecting piece 21 and the flange connecting piece 11 lean against Together, use bolts to pass through two adjacent flange connections, and fix the adjacent flange connections together by rotating nuts. The flange connectors between the water-cooled cover plates 20 are also located above the furnace cover. Through this fixed connection method, the space in the furnace is enlarged, which is convenient for maintenance.

Preferably, the lower surfaces of the central cover plate 10 , the water-cooled cover plate 20 and the opening cover plate 30 all have refractory material layers. Therefore, the electric furnace cover of the utility model can work under ultra-high temperature conditions.

Finally, it should be noted that the above is only a preferred embodiment of the utility model, rather than a limitation to the technical solution of the utility model, and any equivalent replacement or corresponding improvement made to the technical features of the utility model is still within the scope of the utility model. within the scope of protection.

Claims (7)

1. An electric furnace cover, comprising a center cover (10) and a plurality of water-cooled covers (20) around the center cover (10), characterized in that: the edge of the center cover (10) A flange connector (11) is provided on the top, and the water-cooling cover plate (20) is provided with flange connections on the edge jointed with the central cover plate (10) and on the edge jointed with other water-cooled cover plates (21), the central cover plate and the water-cooled cover plate and between each of the water-cooled cover plates are tightly connected by flange connectors. 2. The electric furnace cover according to claim 1, characterized in that: at least one of the plurality of water-cooled cover plates (20) is provided with an opening, and the electric furnace cover also includes a shape corresponding to the opening The matching opening cover plate (30), the joint between the opening cover plate (30) and the water cooling cover plate (20) is connected by bolts. 3. The electric furnace cover according to claim 1, characterized in that: at least one of the plurality of water-cooled cover plates (20) is provided with an opening, and the electric furnace cover also includes a shape corresponding to the opening The matching opening cover plate (30), the joint between the opening cover plate (30) and the water cooling cover plate (20) is connected by a pin shaft. 4. The electric furnace cover according to claim 1, characterized in that: each flange connecting piece is located above the electric furnace cover. 5. The electric furnace cover according to claim 1, characterized in that: the lower surfaces of the central cover plate (10) and the water-cooled cover plate (20) both have refractory material layers. 6. The electric furnace cover according to claim 2 or 3, characterized in that: the lower surfaces of the central cover plate (10), the water-cooled cover plate (20) and the opening cover plate (30) all have Refractory layer. 7. The electric furnace cover according to claim 4, characterized in that: connection holes are formed at the same position of each flange connection piece.

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