JP3584449B2 - Spray-cooled furnace lid - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a spray-cooled furnace lid. Various electric furnaces such as an arc furnace, a plasma torch furnace, and a resistance heating furnace are used for melting and refining metals. These electric furnaces include a furnace main body and a furnace lid attached to the furnace main body. In recent years, a spray-cooled furnace lid has attracted attention as such a furnace lid. The spray-cooled furnace lid has a hollow double-layer structure, sprays cooling water from a spray nozzle installed in the hollow part, and efficiently cools the furnace lid by heat transfer. Things. The present invention relates to an improvement in the above-described spray-cooled furnace lid.
[0002]
[Prior art]
Conventionally, as a spray cooling type furnace lid, an annular water supply header is provided in a hollow portion of a hollow furnace lid having a double structure, a plurality of water supply pipes radially connected to the water supply header, and a plurality of water supply pipes attached to the water supply pipe. The hollow furnace lid is provided with a spray nozzle, and a drain port is opened in the hollow furnace lid. A pump is connected to the drain port via a hose, and the pump is used to connect the spray nozzle to the lower inner wall surface of the hollow furnace lid. A method has been proposed in which cooling water sprayed is forcibly drained (Japanese Patent Application Laid-Open No. 62-500538, JP-A-3-75493).
[0003]
However, since the conventional spray-cooled furnace lid as described above requires a pump for drainage, there is a problem that the cost is increased and an installation place is required.
[0004]
[Problems to be solved by the invention]
The problem to be solved by the present invention is that the conventional spray-cooled furnace lid requires a pump for drainage, and accordingly is expensive and requires an installation place.
[0005]
[Means for Solving the Problems]
The present invention for solving the above-mentioned problems is a spray-cooled furnace lid attached to a furnace body of an electric furnace, wherein a lower portion of the outer periphery of the hollow furnace lid having a double structure communicates with a hollow portion of the hollow furnace lid. The drain box is provided with a drain port at the top of the tap hole of the furnace body and at the top of the tap port on the opposite side of the tap port. A drainage trough fixed to the rotating device of the hollow furnace lid is disposed below the drainage port, and a valve is attached to the other drainage port, and the other drainage trough fixed to the furnace body below the drainage trough. The present invention relates to a spray-cooled furnace lid characterized in that a trough is disposed.
[0006]
In the present invention, the furnace lid is formed in a hollow double structure, usually an annular water supply header in the hollow part, a plurality of water supply pipes radially connected to the water supply header, and attached to the water supply pipe. Equipped with multiple spray nozzles. A drain box communicating with the hollow portion of the hollow furnace lid is provided around the lower surface of the outer periphery of the hollow furnace lid.
[0007]
The drain box is provided with a drain port at the upper part of the tap hole of the furnace main body and at the upper part of the tap hole opposite to the tap port, and a swivel of the hollow furnace lid is provided below the drain port. One drainage trough fixed to the device is arranged. A valve is attached to the other drain port, and the other drain trough fixed to the furnace body is disposed below the valve. This valve is preferably provided with an actuator so that its opening and closing can be remotely controlled.
[0008]
[Action]
When the cooling water is supplied to the water supply header, the cooling water is sprayed on the lower inner wall surface of the hollow furnace lid in a route of the water supply header → the water supply pipe → the spray nozzle, and the sprayed cooling water is discharged to the drain box → the both sides. Drainage outlet → Gravity flow to the outside through both drainage trough routes. At the time of turning the hollow furnace lid, the valve attached to the other drain port is closed, and the sprayed cooling water is caused to flow under its own weight through the drain box → one drain port → one drain trough. Therefore, according to the present invention, a pump for drainage is not required, and the cooling water after spraying can be drained even when the hollow furnace lid is turned. The cooling water sprayed from the spray nozzle to the lower inner wall surface of the hollow furnace lid can be drained at all times, and the inner wall surface of the hollow furnace lid is not immersed. It can be cooled down.
[0009]
【Example】
1 is a plan view showing one embodiment of the present invention, FIG. 2 is a partially enlarged longitudinal sectional view showing the same embodiment as FIG. 1, FIG. 3 is a rear view showing the same embodiment as FIG. 1, and FIG. FIG. 2 is a front view showing the same embodiment as FIG. 1. This embodiment shows a spray-cooled furnace lid of a three-phase AC arc furnace. An annular water supply header 21 and a plurality of radially connected water supply headers 21 are provided in a hollow portion 13a of a hollow furnace lid 13 formed of a hollow double structure by an inner heat resistant steel plate 11 and an outer heat resistant steel plate 12. , And a plurality of spray nozzles 23a, 23b,... Attached to the water supply pipes 22a, 22b,.
[0010]
The water supply header 21 and the water supply pipes 22a, 22b,... Are supported by the outer heat-resistant steel plate 12 at a plurality of locations (not shown), and the water supply port 24 of the water supply header 21 penetrates the outer heat-resistant steel plate 21 to the outside. Has been taken out. A total of three electrode insertion ports 31a, 31b, 31c penetrate through a central portion of the hollow furnace lid 13, that is, a so-called small ceiling portion.
[0011]
A drain box 41 is provided around the lower surface of the outer periphery of the hollow furnace lid 13. The hollow portion 13 a of the hollow furnace lid 13 communicates with the drain box 41, and the bottom A of the drain box 41 is hollow. It is located below the bottom surface B of the furnace lid 13.
[0012]
The hollow furnace lid 13 is attached to a furnace main body 51, and a tap hole 52 and a tap hole 53 are provided on the opposite side of the tap hole 52 in the furnace body 51. It can be tilted by a tilting device that does not. The hollow furnace lid 13 is supported by a turning device 63 via hanging rods 61a and 61b and arms 62a and 62b.
[0013]
In the drain box 41 provided around the lower surface of the outer periphery of the hollow furnace lid 13, a drain port 71 is opened above the tapping port 52, and a drain port 72 is opened above the slag port 53. ing. A drain trough 81 is arranged below the drain port 71, and the drain trough 81 is fixed to the turning device 63. An electromagnetic valve 72a is attached to the drain port 72 as a valve, and a drain trough 82 is disposed below the electromagnetic valve 72a so as to face the electromagnetic valve 72a. The drain trough 82 is fixed to the furnace body 51.
[0014]
When the cooling water is supplied to the water supply header 21 via the water supply port 24, the cooling water is supplied through the path of the water supply header 21 → the water supply pipes 22a, 22b,... → the spray nozzles 23a, 23b,. The sprayed cooling water is sprayed onto the lower inner wall surface of the lower part 13, and the sprayed cooling water flows to the outside by its own weight along a route of a drain box 41 → drain ports 71 and 72 → drain troughs 81 and 82. When the hollow furnace lid 13 is turned, the electromagnetic valve 72a attached to the drain port 72 is closed, so that the cooling water after spraying is externally supplied through the route of the drain box 41 → the drain port 71 → the drain trough 81. Down to its own weight. A pump for drainage is not necessary, and the cooling water after spraying can be drained even when the hollow furnace lid 13 turns. Since the cooling water sprayed from the spray nozzles 23a, 23b,... To the lower inner wall surface of the hollow furnace lid 13 can be drained at all times and the inner wall surface of the hollow furnace lid 13 is not immersed. As a result, the hollow furnace lid 13 can be uniformly and efficiently cooled.
[0015]
【The invention's effect】
As is already clear, the present invention described above does not require a pump for drainage, and can drain the cooling water after spraying even when the hollow furnace lid is swirled. Can be cooled uniformly and efficiently.
[Brief description of the drawings]
FIG. 1 is a plan view showing one embodiment of the present invention.
FIG. 2 is a partially enlarged longitudinal sectional view showing the same embodiment as FIG.
FIG. 3 is a rear view showing the same embodiment as FIG. 1;
FIG. 4 is a front view showing the same embodiment as FIG. 1;
[Explanation of symbols]
13: hollow furnace lid, 21: water supply header, 23a, 23b: spray nozzle, 41: drain box, 51: furnace body, 63: rotating device, 71, 72 ..Drainage ports, 72a ... solenoid valves, 81, 82 ... drainage troughs

Claims (2)

A spray-cooled furnace lid attached to a furnace body of an electric furnace, wherein a drain box that communicates with a hollow portion of the hollow furnace lid is provided around a lower surface of an outer periphery of the hollow furnace lid having a double structure. The drain box is provided with a drain port at an upper part of a tap hole of the furnace body and at an upper part of a tap hole opposite to the tap port, and the hollow furnace is provided below one of the drain ports. A drain trough fixed to the swiveling device of the lid is disposed, and a valve is attached to the other drain port, and the other drain trough fixed to the furnace body is disposed below the drain trough. Spray cooling type furnace lid. 2. The spray-cooled furnace lid according to claim 1, wherein the valve is a valve with an actuator.

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