CN201740367U - Small furnace cover for electric arc furnace - Google Patents

Abstract

The utility model discloses a small furnace cover for an electric arc furnace, which comprises an outer-ring steel plate, a material-endurable main body arranged in the outer-ring steel plate, and three electrode holes arranged on the material-endurable main body. A ring-shaped water-cooling pipe is distributed in the main body, and a ring-shaped anti-arc steel plate is arranged at the bottom part of the main body, so as to exert the water-cooling function, and avoid the water-cooling pipe from being punctured by an electric arc, thereby prolonging the service life of the small furnace cover.

Description

The little bell of electric arc furnaces

Technical field

The utility model relates to bell, more particularly, relates to the little bell of a kind of electric arc furnaces.

Background technology

The electric arc furnaces bell is made up of big bell and port lid, and the periphery is big bell, generally adopts water-cooling pattern, and the centre is little bell, is generally Quan Naicai and makes.The major function of little bell: the one, electrode moves up and down therein, so relative other position of temperature is much higher; The 2nd, prevent in the smelting process that the electric arc arcing between electrode and the big bell from causing that the cooling water pipe of big bell is leaked by arc through, therefore adopt refractory material to fill and form by a firing little bell and place in the middle of the big bell.

Because the residing hot environment of little bell is abominable, temperature is up to 1700 ℃ in the stove, and molten iron temperature is up to 1650 ℃.Flue gas floats and can corrode anti-material, and therefore little bell becomes the weakest position in the whole arc furnace system, is one of principal element of restriction electric arc furnaces production.People adopt various falling temperature techniques, receive a mandate with the use that prolongs little bell, usual way is to adopt the water-cooled comb that bell is cooled off, but just to big bell, anhydrous cold-working is used and to little bell, because port lid adopts the water-cooled comb to have an electric arc arcing easily to puncture the technical barrier that cooling water pipe causes leaking, leak that enter can be explosion caused in the electric arc furnaces, produce great potential safety hazard.Therefore, the water-cooled comb can only be used for big bell at present, and can not be used for little bell.

Chinese patent CN101539367A discloses a kind of small furnace cover of electric furnace and manufacture method, and it is by prefabricated ventilation cooling duct in port lid refractory material, by the air-cooled port lid temperature that reduces.But adopt air-cooled actual cooling effect very limited; be difficult to form protective layer at port lid inner face; the erosion aggravation of little bell is not overcome; and the anti-equipment structure intensity of trigonum weakens owing to being divided into the air-cooled passage of arranging multiplayer around the port lid electrode; and steel construction bottom, small furnace cover of electric furnace outer ring does not have cooling effect; very easily aging impaired, whole slump easily takes place in the anti-material that weathers in the bell, and the physical fault rate is higher.

The utility model content

At the above-mentioned shortcoming that exists in the prior art, the purpose of this utility model provides the little bell of a kind of electric arc furnaces, and this little bell can reduce aging, the slump of its anti-material by the preventing arc water-cooled.

For achieving the above object, the utility model adopts following technical scheme:

The little bell of this electric arc furnaces comprises the outer ring steel plate, be located at the body of anti-material the in it and be opened in three electrode holes on the body, is laid with annular water cooling tube in the described body, and described body bottom is provided with annular preventing arc steel plate.

Described annular water cooling tube is two-layer up and down, and its inlet tube and outlet tube stretches out the top along the outer ring steel plate from body.

Described upper and lower layer water cooling tube lateral wall is welded with the perpendicular supporting plate of steel, and perpendicular supporting plate opposite side welds mutually with corresponding outer ring steel plate inwall.

The bottom of described lower floor water cooling tube is welded with the horizontal supporting plate of steel, and the horizontal supporting plate other end welds mutually with corresponding outer ring steel plate inwall.

In technique scheme, the little bell of electric arc furnaces of the present utility model comprises the outer ring steel plate, be located at the body of anti-material the in it and be opened in three electrode holes on the body, in body, be laid with annular water cooling tube, and be provided with annular preventing arc steel plate in the body bottom, thereby not only can play the water-cooled effect, but also avoided its water cooling tube to be punctured by the electric arc arcing, prolonged the service life of little bell.

Description of drawings

Fig. 1 is the vertical view of the little bell of electric arc furnaces of the present utility model;

Fig. 2 is the cutaway view along the A-A line among Fig. 1.

The specific embodiment

Further specify the technical solution of the utility model below in conjunction with drawings and Examples.

See also Fig. 1, shown in Figure 2, electric arc furnaces port of the present utility model lid 10 is basic identical with prior art, is the reverse frustoconic structure, comprises outer ring steel plate 11, is located at the body of anti-material the 12 in it and is opened in three electrode holes 13 on the body 12.Different is, in body 12, be laid with annular water cooling tube 14, port is covered 10 outer ring steel plates 11 and the body of anti-material the 12 cools off, and specific as follows: this annular water cooling tube 14 is designed to two-layer up and down, and its inlet tube and outlet tube 141,142 stretches out 12 tops along outer ring steel plate 11 from body.Because the heat conductivility of outer ring steel plate 11 is than the height of anti-the material, therefore, the perpendicular supporting plate 15 of employing steel carries out continuous welding between the inwall of the outer wall of the annular water cooling tube 14 of upper and lower layer and outer ring steel plate 11, to increase capacity of heat transmission, and the horizontal supporting plate 16 of employing steel carries out horizontal continuous welding between the inwall of the bottom of lower floor annular water cooling tube 14 and corresponding outer ring steel plate 11, to increase capacity of heat transmission, thereby the temperature that makes outer ring steel plate 11 conducts to annular water cooling tube 14 by the heat of erecting supporting plate 15 and horizontal supporting plate 16 and cools off, and guarantees the cooling effect of outer ring steel plate 11.For preventing that annular water cooling tube 14 is by arc through, be provided with an annular preventing arc steel plate 17 in body 12 bottoms, as the first road preventing arc measure, this preventing arc steel plate 17 maintains a certain distance with annular water cooling tube 14, also be filled with anti-material therebetween, and the insulating effect of anti-material has further improved the preventing arc ability.In addition, horizontal supporting plate 16 has also played the effect of the second road preventing arc except that playing conduction of heat, thereby avoids water cooling tube to be punctured by the electric arc arcing.

Adopted port lid 10 of the present utility model, bring up to 150 heats from 84.36 original heats its service life (average furnace life).If covering 10 swap times by each port is 2 hours, can save time about 114 hours, increase about 11400 tons of production capacity, disregard expenses such as anti-material and processing, only expense of steel construction of port lid 10 just can be saved 37.02 ten thousand yuan, and effect is fairly obvious.

Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the utility model, and be not to be used as qualification of the present utility model, as long as in connotation scope of the present utility model, all will drop in claims scope of the present utility model variation, the modification of the above embodiment.

Claims (4)

1. little bell of electric arc furnaces comprises the outer ring steel plate, is located at the body of anti-material the in it and is opened in three electrode holes on the body, it is characterized in that:

Be laid with annular water cooling tube in the described body, described body bottom is provided with annular preventing arc steel plate.

2. the little bell of electric arc furnaces as claimed in claim 1 is characterized in that:

Described annular water cooling tube is two-layer up and down, and its inlet tube and outlet tube stretches out the top along the outer ring steel plate from body.

3. the little bell of electric arc furnaces as claimed in claim 2 is characterized in that:

Described upper and lower layer water cooling tube lateral wall is welded with the perpendicular supporting plate of steel, and perpendicular supporting plate opposite side welds mutually with corresponding outer ring steel plate inwall.

4. the little bell of electric arc furnaces as claimed in claim 2 is characterized in that:

The bottom of described lower floor water cooling tube is welded with the horizontal supporting plate of steel, and the horizontal supporting plate other end welds mutually with corresponding outer ring steel plate inwall.

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