JPH0961062A - Spray cooling type furnace lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spray cooling type furnace lid in which a fixing work for header and a plurality of pipes and an installing work for a plurality of spray nozzles can easily be carried out, a spray nozzle repairing work may also easily be performed and an entire furnace lid can be made thin. SOLUTION: A header 4 and a pipe 5 for supplying cooling water to a spray nozzle 6 are fixed to an upper part of an upper plate 2, and only the spray nozzle 6 or both the spray nozzle 6 and a branch pipe 5a are inserted into a hollow part 7 enclosed by the upper plate 2 and the lower plate 3.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a spray cooled furnace lid. For example, when melting a metal strip, an arc furnace is used which comprises a furnace body, a furnace lid attached to the furnace body and electrodes inserted from the furnace lid into the furnace. The present invention relates to an improvement of a furnace lid represented by such an arc furnace lid, in which a spray cooling type furnace lid is cooled by spraying cooling water from a spray nozzle.

[0002]

2. Description of the Related Art Conventionally, a spray-cooling type furnace lid is usually formed in a hollow structure surrounded by an iron upper plate and a lower plate, and a header and a plurality of headers connected to the header are formed in the hollow portion. The above-mentioned pipes are attached and a plurality of spray nozzles are provided in each of the pipes (Japanese Patent Laid-Open No. 3-87594). This spray-cooling type furnace lid supplies cooling water to the header whose base end is taken out at the upper part of the upper plate, and the inner surface of the furnace lid formed in the hollow structure is routed from the header → piping → spray nozzle. After spraying, the sprayed cooling water is collected by a pump suction from a drain port provided at the periphery of the furnace lid, cooled if necessary, and then circulated and reused.

However, the conventional spray cooling type furnace lid has the following drawbacks. 1) Mounting a header and a plurality of pipes in a hollow portion of a narrow space, and further disposing a plurality of spray nozzles in each of the pipes is itself very troublesome. 2) The spray nozzle is often clogged by foreign matter in the cooling water, but each time the operation is stopped, it is necessary to perform troublesome repair work in the hollow space of the narrow space where headers and multiple pipes are complicatedly installed. To be 3) The header and a plurality of pipes are attached, and further, a plurality of spray nozzles are arranged in each of the pipes, and at the same time, a spraying area of the cooling water from each spray nozzle is secured, so that the space is narrow. Even so, the hollow portion needs to have a correspondingly large vertical width, and as a result, the overall furnace lid becomes bulky.

[0004]

SUMMARY OF THE INVENTION The problems to be solved by the present invention are, in the conventional spray cooling type furnace lid, the work of mounting the header and the plurality of pipes in the hollow portion of the narrow space and the arrangement of the plurality of spray nozzles. The installation work is extremely troublesome, and the spray nozzle repair work in the hollow portion is also very troublesome, and the furnace lid itself becomes bulky.

[0005]

SUMMARY OF THE INVENTION The present invention, however, has a hollow structure surrounded by an upper plate and a lower plate, and sprays cooling water from a plurality of spray nozzles arranged in the hollow portion. In the spray-cooled furnace lid configured as described above, the header and the pipe for supplying the cooling water to the spray nozzle are attached to the upper part of the upper plate, and only the spray nozzle or the spray nozzle and the branch pipe connected thereto are provided. The spray-cooled furnace lid is characterized by being inserted in the hollow portion.

In the present invention, the furnace lid is usually formed in a hollow structure surrounded by an upper iron plate and a lower iron plate. A header and a plurality of pipes connected to the header are attached to the upper portion (outer surface) of the upper plate. A plurality of spray nozzles are connected to each pipe at appropriate intervals, usually via a flexible member, and optionally via a branch pipe, and only the spray nozzle or the spray nozzle and the spray nozzle are connected thereto. The branched pipe is inserted into the hollow portion from the upper plate. In general, the upper plate is provided with a viewing window for confirming the spraying condition of the cooling water from each spray nozzle, and the lower plate is provided with a drain port at the lower end thereof.

[0007]

1 is a partial vertical cross-sectional view illustrating a spray cooling type furnace lid according to the present invention. Here, a furnace lid attached to the furnace body of the arc furnace is shown. The furnace lid 1 is formed in a hollow structure surrounded by an iron upper plate 2 and a lower plate 3. Central part of the furnace lid 1 (a part corresponding to a so-called small ceiling part)
A refractory material is attached to the furnace. From the refractory material, usually three electrodes (not shown) are inserted into the furnace. A header 4 and a plurality of pipes 5 connected to the header 4 are connected to the upper portion (outer surface) of the upper plate 2, and in the case of FIG.
Is formed in a ring shape as a whole when seen from a plane, and the plurality of pipes 5 are radially connected to the ring-shaped header 4 as a whole at a predetermined interval when seen from a plane. A plurality of spray nozzles 6 are connected to each of the plurality of pipes 5 at predetermined intervals, and in the case of FIG. 1, the spray nozzle 6 closest to the center is connected to the pipe 5 via a branch pipe 5a, These spray nozzles 6 and branch pipes 5a are the upper plate 2
Is inserted in the hollow portion 7 surrounded by the upper plate 2 and the lower plate 3. A drain port 8 is opened at the lower end of the peripheral edge of the lower plate 3.

FIG. 2 is a partially enlarged view of FIG. A through hole 2a is formed in the upper lid 2, a cylindrical female screw member 6a is welded to surround the through hole 2a, and a female tube member 6b having a convex and cylindrical shape as a whole is formed on the female screw member 6a. It is screwed. The male / female screw member 6b is connected to the pipe 5 via a pressure-resistant hose 6c, the base end portion of the spray nozzle 6 is screwed to the female / male screw member 6b, and the tip end portion of the spray nozzle 6 is hollow. Has been inserted. When using the branch pipe 5a, the proximal end portion of the branch pipe 5a is screwed into the male and female screw member 6b, so that the tip end portion of the branch pipe 5a and the spray nozzle 6 connected thereto are inserted into the hollow portion 7.

Cooling water is supplied from the header 4 to the pipe 5 (branch pipe 5a).
→ The spray nozzle 6 is sprayed from the spray nozzle 6 onto the inner peripheral surface of the hollow furnace lid 1 to cool the furnace lid 1. The sprayed cooling water is collected from the drainage port 8 by its own weight or by pump suction (not shown), cooled if necessary, and then circulated and reused in the header 4.

Since the header and the plurality of pipes can be attached and the plurality of spray nozzles connected to each of the pipes can be arranged on the upper plate,
These tasks are easy. Further, when some of the plurality of spray nozzles are clogged, only the corresponding spray nozzle can be removed, repaired and mounted on the upper plate, so that the repair work is also easy. Further, the header and the plurality of pipes are attached to the upper part of the upper plate, and only the plurality of spray nozzles or the spray nozzles and the branch pipes connected to the spray nozzles are inserted into the hollow portion surrounded by the upper plate and the lower plate. On the other hand, on the other hand, even if it is considered to secure the spraying area of the cooling water from each spray nozzle,
The width of the hollow portion in the vertical direction can be correspondingly reduced, and as a result, the furnace lid can be made thin as a whole.

[0011]

As is apparent from the above, according to the present invention described above, the work of mounting the header and the plurality of pipes and the work of disposing the plurality of spray nozzles are simple, and the repair work of the spray nozzles is also simple. The effect is that the furnace lid can be made thinner as a whole.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional view illustrating a spray cooling type furnace lid according to the present invention.

FIG. 2 is a partially enlarged view of FIG.

[Explanation of symbols]

1 ... Furnace lid, 2 ... Upper plate, 3 ... Lower plate, 4 ...
Header, 5 ... Piping, 5a ... Branch pipe, 6 ... Spray nozzle, 7 ... Hollow part

Claims (1)

[Claims] 1. A spray-cooled furnace lid having a hollow structure surrounded by an upper plate and a lower plate, wherein cooling water is sprayed from a plurality of spray nozzles arranged in the hollow portion. A header and a pipe for supplying cooling water to the spray nozzle are attached to an upper part of the upper plate, and only the spray nozzle or the spray nozzle and a branch pipe connected to the spray nozzle are inserted in the hollow portion. Spray cooling type furnace lid.