JPS6236063Y2 - - Google Patents

Description

[Detailed description of the invention] This invention allows the charging bucket to run inside the enclosure, thereby eliminating unnecessary openings and preventing smoke leakage from the enclosure when charging raw materials into the arc furnace. The present invention relates to an enclosure for an arc furnace that prevents this from occurring and further improves the working environment and work efficiency.

In recent years, while the energy situation has worsened, regulations on improving the work environment and preventing pollution have become even more stringent, and the operating environment for steelmaking arc furnaces is extremely harsh.

During the operation of an arc furnace for steelmaking, the smoke and dust generated from the arc furnace significantly deteriorates the working environment.
Therefore, if we try to prevent such pollution by collecting dust from buildings, steel factories have many openings.
Dust collectors suck in a large amount of air in addition to smoke. Therefore,
Since a large amount of air must be exhausted, a large fan is required, which increases equipment costs and operation and maintenance costs. In addition, arc furnaces for steelmaking generate loud noises of up to 120 dBA, which can cause occupational diseases such as hearing loss.

Therefore, in order to solve the above problems, the entire arc furnace was enclosed in an enclosure to prevent the leakage of smoke and dust, and to insulate the noise until normal conversation was possible. This has improved significantly, and it has become possible to reduce the exhaust air volume by more than half.

To explain such a conventional enclosure with reference to FIG. 1, an enclosure main body a surrounding an arc furnace has an opening b through which a bucket passes when raw materials are introduced into the arc furnace, and a wire for suspending the bucket. An opening c is provided through which the rope passes, and large doors d and e are attached to these openings b and c.

However, the above enclosure has various problems as follows.

The opening b through which the bucket passes is large, and
Since the opening c through which the wire rope passes is located directly above the arc furnace where smoke is generated most intensely, the working environment deteriorates due to smoke leakage when charging raw materials.

To prevent smoke leakage when charging raw materials, either install ducts around openings b and c to absorb smoke with a large air volume, or install air curtains near openings b and c to prevent smoke leakage. However, it is not possible to completely prevent smoke leakage. Particularly when reloading, a large amount of combustible material containing impurities is thrown into the high-temperature furnace, and a large amount of smoke is emitted, causing a large amount of smoke to be blown up by the rising air, making it extremely difficult to prevent this with smoke suction or air curtains. It is.

Since there must be no obstacles in the way of the wire rope suspending the bucket over the arc furnace, it is not possible to pass the upper beam through point f in Figure 1, and the enclosure therefore lacks rigidity. and
This is economically disadvantageous because the rigidity of other members must be increased.

It is necessary to pass the bucket accurately through the opening b, and if the operation is incorrect, there is a risk that the enclosure may be damaged due to a collision.

Since it is necessary to move two larger doors compared to a general electric furnace, the operation time is slightly longer, but
become longer.

It is also possible to house the crane itself for transporting buckets within the enclosure, but in this case, even though the opening and door in the ceiling are unnecessary, the door in the side wall would be very large, making it uneconomical. Moreover, it takes time to operate due to the large door, and it is not possible to prevent smoke leakage.

The present invention eliminates the above-mentioned drawbacks of the conventional arc furnace enclosure, and provides an arc furnace enclosure that completely prevents smoke leakage, has sufficient rigidity, has good operability, and has high work efficiency. The arc furnace is surrounded by an enclosure body that has a protrusion on one side and is approximately L-shaped in plan view, and a dust collection duct is provided above the enclosure body. death,
Along both sides of the wall of the enclosure body, a pair of left and right rails are installed along which a beam carrying a charging bucket for feeding raw materials into the arc furnace can run, and the beam carrying a charging bucket runs along the rails. One rail is extended to near the end of the protruding part of the enclosure body, and the other rail is extended to the outside of the enclosure body so that the charging bucket can be located outside the enclosure body when the top is moved to the end opposite to the arc furnace side. An opening that also serves as an air intake port is provided in the wall of the enclosure main body, where the beam carrying the charging bucket passes through, so as not to hinder the beam's travel. The device is characterized in that an opening is provided in the portion, and a shutter for opening and closing the opening is arranged to be able to move up and down.

Embodiments of the present invention will be described below with reference to the drawings.

Rail 2 laid so as to extend to the arc furnace 1 side
Place the beam 4 on a and 2b via the wheels 3,
A traveling drive device 5 is mounted on the beam 4, and a charging bucket 6 for charging raw materials is fixed so that the charging bucket 6 can run directly above the arc furnace 1. A bucket opening/closing device 7 is installed at the

The entire arc furnace 1 and rail 2a as well as the rail 2
A predetermined position b is surrounded by an enclosure body 8 having a substantially L-shaped planar shape, and raw materials can be charged into the charging bucket 6 by a crane or the like outside the enclosure body 8. An opening 9 which also serves as an air intake port is provided in the beam 4 penetration portion so as not to hinder the running of the beam 4, and an opening 10 is provided in the charging bucket 6 passage portion of the enclosure main body 8. can be closed by a shutter 12 that can be raised and lowered by a lifting drive device 11, and a dust collection duct 13 is installed directly above the arc furnace 1 within the enclosure main body 8. Furthermore, if the leakage of noise from the opening 9 is large, a silencer 14 is attached to the beam 4 to prevent noise.

Next, the operation of the present invention will be explained.

When charging raw materials into the charging bucket 6, the charging bucket 6 is positioned outside the enclosure, and the shutter 12 is kept closed.

After loading raw materials into the charging bucket 6 using a crane or the like (not shown), the intermediate shutter 12 is opened, the charging bucket 6 is moved together with the beam 4 and placed inside the enclosure, the intermediate shutter 12 is closed, and the loading bucket 6 is loaded. The charging bucket 6 is moved to just above the arc furnace 1, the furnace lid of the arc furnace 1 is opened, the lower part of the charging bucket 6 is opened, and the raw material is charged into the arc furnace 1. The smoke emitted at this time enters the dust collection duct 13 together with the air taken in through the opening 9 and is discharged to the outside.

After charging the raw materials, the lower part of the charging bucket and the furnace lid are closed, the shutter 12 is opened to take out the post-charging bucket 6, the shutter 12 is closed, and the operation is performed. During operation, raw materials are put into the charging bucket 6,
Wait outside the enclosure until the next raw material charge. The raw materials charged into the arc furnace 1 from the charging bucket 6 include scrap, auxiliary raw materials, and the like.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

According to the arc furnace enclosure of the present invention, there is no large opening in the enclosure when charging raw materials, so there is no risk of smoke leakage.
The working environment will become even better.

Since there is no need for an opening for passing the rope on which the bucket is suspended, sufficient rigidity within the enclosure can be achieved with a simple structure, which is economical.

Since erroneous operations that may occur during crane operation are eliminated, there is no risk of the bucket colliding with the enclosure and damaging the enclosure or other equipment, thus significantly improving safety.

Since raw materials can be charged into the charging bucket regardless of the operating state of the furnace, the operating rate of the equipment can be improved.

Since there is no risk of incorrect operation, raw materials can be reliably charged into the furnace.

Material charging time is shorter and more accurate than with a crane, which improves the operating rate of the arc furnace.
Productivity can be increased.

Various excellent effects can be achieved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional example, FIG. 2 is an explanatory plan view of the present invention, and FIG. 3 is a view taken in the - direction arrow of FIG. In the figure, 1 is an arc furnace, 6 is a charging bucket, 8 is an enclosure body, 9 and 10 are openings, 12 is a shutter, and 13 is a dust collection duct.

Claims (1)

[Scope of utility model registration request] The arc furnace is surrounded by an enclosure main body having a protrusion on one side and a substantially L-shaped planar shape, and a dust collection duct is arranged above the enclosure main body, and a dust collection duct is installed on both side walls of the enclosure main body. Along the line, a pair of left and right rails are installed on which the beam carrying the charging bucket for feeding raw materials into the arc furnace can run, and the beam carrying the charging bucket runs on the rails to the end on the opposite side of the arc furnace. When the loading bucket is placed outside the enclosure body, one rail is extended to the vicinity of the end of the protruding part of the enclosure body, and the other rail is extended to the outside of the enclosure body. An opening that also serves as an air intake port is provided in the part of the beam carrying the charging bucket that passes through so as not to hinder the beam's movement, and an opening is provided in the part of the wall of the enclosure body that passes through the charging bucket, and the opening An enclosure for an arc furnace characterized by having a shutter that can be raised and lowered to open and close.