JPH0328314Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an enclosure having a dustproof and soundproof structure surrounding a melting furnace.

[Prior Art] Conventionally, as one of dustproof and soundproof measures for a melting furnace, a method has been adopted in which the melting furnace is covered with side walls and a ceiling wall having a dustproof and soundproof structure. The enclosure of the melting furnace is provided with various openings, such as entrances and exits for workers, work openings, loading and unloading ports for loading buckets and ladles for scrap (raw materials), etc. The opening is equipped with an opening/closing door.

Among these openings, the opening provided in the ceiling wall so that the hanging device for the bucket can pass through is kept open while the bucket is carried into the enclosure. Therefore, in the past, an air curtain device was provided at the opening of the melting furnace to prevent the exhaust gas from flowing out to the outside.

[Problems that the invention aims to solve] However, with the air curtain installed in the opening of the ceiling wall, it is difficult to completely eliminate the high-temperature exhaust gas that is blown up from the melting furnace when scrap (raw material) is charged. It was difficult to seal the air curtain while keeping the temperature low, and the air curtain also consumed a lot of electricity.

This invention solves these conventional problems.

[Means for Solving the Problems] The melting furnace enclosure of this invention surrounds the melting furnace with a side wall and a ceiling wall, and is equipped with an exhaust system for exhausting exhaust gas from the melting furnace. In the enclosure of the melting furnace, the wall of which is formed with an opening through which the bucket suspension device passes, a small room is provided above the opening in the ceiling wall, in which the opening through which the bucket suspension device passes, A feature is that an exhaust system of the enclosure is connected to this small room so as to exhaust the exhaust gas that has flowed into the small room.

[Function] The melting furnace enclosure according to this invention introduces the exhaust gas inside the enclosure into a small room provided above the opening in the ceiling wall through which the bucket hanging device passes, and then transfers the introduced exhaust gas to the enclosure. Exhaust gas is completely prevented from escaping to the outside by exhausting the air by the exhaust system and at the same time allowing outside air to flow into the chamber through the opening of the chamber through which the bucket hanging device passes.

[Example] Hereinafter, an example of this invention will be described based on the drawings.

In the figure, 1 is a melting furnace, 2 is a ladle, and 3 is a slag pan, which are covered by an enclosure 4. The enclosure 4 consists of a dustproof and soundproof side wall 5 and a ceiling wall 6, and the side wall 5 includes a work door 7, a loading/unloading door 8 for the ladle 2, and a slag pot 3.
Carrying in/out entrance doors 9 are provided so as to be openable and closable. A bucket hanging device 10 is installed on the ceiling wall 6.
An opening 11 is provided through which the opening 11 passes. The hanging device 10 includes a bucket hanging cable 12.
The scrap (raw material) in the bucket 13 is charged into the melting furnace 1 by moving the material charging bucket 13 in the direction of the front and back of the paper in the figure while it is suspended. Therefore, an opening 11 is formed along the moving direction of the hanging device 10. When carrying the bucket 13 into and out of the enclosure 4, a door (not shown) provided on the side wall 5 is opened to allow the bucket 13 to pass through. Further, an exhaust duct 15 is connected to the ceiling wall 6 through an exhaust duct opening/closing control valve 14 . The exhaust duct 15 is connected to an exhaust device (not shown) and forms a series of exhaust systems for exhausting exhaust gas within the enclosure 4.

Furthermore, a small room 16 is provided above the opening 11 in the ceiling wall 6. This chamber 16 extends along the opening 11 and communicates from the opening 11 into the enclosure 4 . An opening 17 is provided in the upper part of the small room 16, located directly above the opening 11 and extending in the same manner. The suspension device 10 therefore has these openings 17,1
It will move through 1 up and down. The small room 16 is connected to the exhaust duct 15 through a small room exhaust duct opening/closing control valve 18. Further, the upper part of the small room 16 is provided with an opening/closing door 19 that slides in the left-right direction in the figure in order to open and close the opening 17. The opening/closing door 19 is divided into a plurality of parts along the extending direction of the opening 17, and is configured to partially open/close the opening 17 by sliding each part individually.

Next, the effect will be explained.

When the bucket 13 is not carried into the enclosure 4, the opening/closing door 19 completely closes the opening 17, the small room exhaust duct opening/closing control valve 18 is in a closed state, and the exhaust duct opening/closing regulating valve 14 is in an open state. . Therefore, the melting furnace 1 is completely covered by the enclosure 4,
Exhaust gas from the melting furnace 1 passes through an exhaust duct opening/closing control valve 14 and an exhaust duct 15 and is exhausted from a series of exhaust systems.

When charging raw materials into the melting furnace 1, fully open the on-off control valve 18 for the small room exhaust duct,
The exhaust duct opening/closing valve 14 is throttled to start exhausting the inside of the small room 16, and the opening/closing door 19 at the top of the small room 16 is opened all at once. Then, the opening/closing door (not shown) provided on the side wall 5 is opened, the bucket 13 suspended by the hanging device 10 is carried into the enclosure 4, and then the opening/closing door is immediately closed. Then, the hanging device 10 is placed in the upper and lower openings 17 and 11.
The hanging device 10 is moved along the openings 17 and 11 with the cable 12 passing through, and the bucket 13 is positioned over the center of the melting furnace 1. Then, the opening/closing door 19 is closed so as to close the upper opening 17, leaving a portion through which the cable 12 of the hanging device 10 passes. Then, the raw material in the bucket 13 is charged into the melting furnace 1. At that time, the exhaust gas that blows up vigorously is exhausted through the exhaust duct on-off control valve 14 as indicated by the arrow in the figure, and also passes through the opening 11 into the small room 1.
After flowing into the chamber 6, the air is exhausted through the opening/closing control valve 18 for the small room exhaust duct.

At that time, the small room 1 due to suction from the duct 15
Due to the negative pressure inside 6, outside air flows into the small room 16 through the opening 17 at the top. Therefore, small room 1
The exhaust gas inside the enclosure 4 does not flow out to the outside at all.
Exhaust gas is completely prevented from leaking to the outside.
In addition, the outside air flowing into the small room 16 lowers the temperature of the exhaust gas and dilutes the exhaust gas to lower the dust concentration. Moreover, the inflow of outside air prevents the bucket suspension device 10, particularly its cable 12, from overheating.

After charging the raw materials, the hanging device 10 with the bucket 13 hanging thereon is moved out of the enclosure 4 by the reverse operation to that described above.

By the way, in the above-mentioned example, when carrying the bucket 13 into and out of the enclosure 4, the divided opening/closing doors 19 are opened all at once, but the invention is not limited to this, and for example, the divided opening/closing doors 19 may be sequentially opened and closed according to the movement of the hanging device 10, so that only the opening/closing door 19 in the portion where the hanging device 10 is located is opened, and the opening/closing door 19 in other portions is closed. In this case, the opening 17 will be opened to the minimum necessary extent, which is advantageous in preventing exhaust gas from flowing out. Note that the opening/closing door 19 may have an integral structure without being divided.

[Effects of the invention] As explained above, the enclosure of the melting furnace of this invention has a small room above the opening in the ceiling wall through which the bucket hanging device passes, and the enclosure is arranged inside this small room. Since the exhaust system is configured to exhaust air, the following effects can be achieved.

(1) Through the opening of the small room through which the bucket hanging device passes, outside air will flow into the small room from outside, rather than from inside the small room to the outside.
It is possible to completely prevent exhaust gas from flowing into the atmosphere.

(2) Since outside air flows into the small room through the opening of the bucket hanging device, it is possible to lower the temperature of the exhaust gas and dilute the exhaust gas to reduce the dust concentration. The inflow of outside air also prevents the bucket hanging device from overheating.

(3) Since there is no need for an air curtain device that consumes a lot of power, it is possible to save power and reduce running costs.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view for explaining one embodiment of this invention. 1... Melting furnace, 4... Enclosure, 5... Side wall, 6
...Ceiling wall, 10...Bucket hanging device, 1
1...Opening, 12...Cable, 13...Bucket, 15...Exhaust duct, 16...Small room, 1
7...Opening.

Claims (1)

[Scope of utility model registration request] The melting furnace is surrounded by a side wall and a ceiling wall, and is equipped with an exhaust system for exhausting exhaust gas from the melting furnace, and the ceiling wall has an opening through which a bucket hanging device passes. In the body, a small room is provided above the opening in the ceiling wall in which an opening is formed through which the bucket hanging device passes, and an enclosure is installed in this small room so as to exhaust the exhaust gas that has flowed into the small room. An enclosure for a melting furnace, characterized in that it is connected to an exhaust system.