JPS5832152Y2 - Water-cooled steel tube integrated furnace lid for electric furnaces - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a water-cooled furnace cover used in an electric furnace for steelmaking.

Traditionally, electric furnace lids are made of refractory bricks, but these refractory bricks are subject to the high heat generated during electric furnace operation, and are subject to gradual wear and tear due to phenomena such as melting or spoiling. This had to be updated, leading to a decrease in the operating rate of the electric furnace and an increase in production costs.

In order to solve these problems, a water-cooled steel plate furnace lid has already been proposed (Utility Model Application Publication No. 129504/1983,
Utility Model Application Publication No. 54-21606, etc.).

However, as shown in FIG. 5, these have a steel plate water cooling jacket in which the furnace lid 50 is divided into a plurality of segments 51 and the inside of each segment 51 is divided into appropriate passages 53 by partition plates 52. Therefore, in such a structure, since the partition plate 52 is welded, there is a limit to how narrow the passage 53 can be, and therefore the flow rate of cooling water cannot be increased above a certain value, resulting in a decrease in cooling efficiency. There was a limit.

In addition, flow stagnation occurs at the welded portion of the partition plate 52, and water scale accumulates, increasing flow path resistance, resulting in insufficient flow rate, and lowering thermal conductivity.

Furthermore, in the section A shown in FIG. 5, the front panel plate 54
Since water does not come into contact with the contact diagram between the partition plate 52 and the partition plate 52, that portion is particularly susceptible to heat and easily damaged.

SUMMARY OF THE INVENTION The object of the present invention is to provide a water-cooled steel pipe furnace cover for an electric furnace that is easy to manufacture and has significantly improved cooling performance and durability.

Therefore, the feature is that the hearth lid is divided into fan-shaped segments, and the segments close together in a meandering manner to the peripheral edge that goes around the fan-shaped periphery and the space surrounded by the peripheral edge. The closed section is made up of a single continuous bent steel pipe, which serves as a ceiling wall that partitions the inside and outside of the furnace, and cooling water supply and drainage ports are provided at both ends of the steel pipe.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

In FIGS. 1 to 4, reference numeral 1 denotes a furnace lid, which is a circular lid and is detachably placed on the top of the electric furnace body 2. As shown in FIG.

The furnace lid 1 has a small ceiling 3 at the center and an outer ring 4 at the outer periphery, and a plurality of fan-shaped segments provided in a radial arrangement between the small ceiling 3 and the outer ring 4.

The small ceiling 3 is a refractory structure having electrodes 6, and the outer ring 4 has a cross section that constitutes two upper and lower independent water flow chambers 7.
It has a triangular cylindrical ring shape.

The segments 5 are connected to each other by a connector 8, and are suspended by a hanger 9 projecting from the outer ring 4 by a hanger 10, a hanging rod 11, and the like.

As the details are shown in FIGS. 3 and 4, the fan-shaped segment 5 is formed of one continuous bent steel pipe, and includes a peripheral edge 12 that goes around the fan-shaped periphery and a space surrounded by the peripheral edge 12. It has a tight meandering closing part 13 that closes the peripheral edge part 12.
A cooling water supply/drainage port 14 is provided at the starting end of
is provided.

Although not shown, a water supply pipe or a drainage pipe is connected to each of the water supply and drainage ports 14.

The gaps between the steel pipes are filled with firebrick powder 15, etc., so that no gaps will be formed inside or outside.

Thus, the steel pipe constitutes a ceiling wall that partitions the inside and outside of the furnace.

According to the above-mentioned embodiment of the present invention, since the segment 5 is formed of one continuous bent steel pipe, it is easy to divide the entire furnace lid into an arbitrary number of segments 5.

Furthermore, since it is a single steel pipe without a partition plate or the like as in the past, there is less pipe resistance and it is difficult for water stains to adhere.

Furthermore, since a steel pipe of any diameter can be used, the flow rate can be increased by using a pipe with a small inner diameter, and in the embodiment, an average flow rate of 1.
0 to 2.5 m/sec can be secured, and the cooling effect is great.

In addition, for manufacturing, all you need to do is bend and form the steel pipe.
It does not require welding or sheet metal processing, and can be manufactured extremely easily.

Since the present invention is constructed so that the ceiling wall is made of steel pipes, it has the same effect as the above-mentioned embodiment, is easy to manufacture, and has significantly improved cooling performance and durability. It is capable of providing a lid,
The practical benefits are extremely large.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. 3 is a plan view of a segment.
FIG. 4 is a sectional view taken along the line IV--IV in FIG. 3, and FIG. 5 is an explanatory diagram showing a conventional example. 1... Furnace lid, 5... Segment, 12
...Peripheral part, 13...Occluded part, 14.
...... Water supply and drainage outlet.

Claims (1)

[Scope of utility model registration request] In a hearth lid that is divided into fan-shaped segments, each segment has a waste edge that goes around the fan-shaped periphery, and a closing part that closes the space surrounded by the □ periphery in a tight meandering manner. A water-cooled steel pipe for electric furnaces, characterized in that it is formed of a continuous bent steel pipe, the steel pipe serves as a ceiling wall that partitions the inside and outside of the furnace, and cooling water supply and drainage ports are provided at both ends of the steel pipe. Integrated hearth.