JPH0227690A - Electrode cooling method for steel making arc furnace - Google Patents

Abstract

PURPOSE:To increase the cooling effect by spraying the cooling water downward to an electrode at an angle less than 90 deg. with respect to the tangent line in the peripheral direction of the principal plane of the electrode. CONSTITUTION:The most portion or all of the cooling water 4 is sprayed downward to an electrode 1 at an angle theta1 less than 90 deg. with respect to the tangent line in the peripheral direction of the principal plane of the electrode 1. All of the cooling water 4 is sprayed at the angle theta1, or the most portion of the cooling water is sprayed in a fan shape at the angle theta1 less than 90 deg.. The cooling water 4 is easily conveyed on the surface of the electrode 1, a high cooling effect is obtained in the environment where dust or oxidation reducing the cooling effect is liable to occur, the original unit of the electrode can be reduced as compared with the conventional method.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for direct water cooling of electrodes in an arc furnace for steelmaking.In particular, cooling water easily travels through the electrodes on the electrode surface, thereby increasing the oxidation prevention effect. This invention relates to an improvement in the direct water cooling method that can be used.

[Prior Art] As a measure to reduce the unit consumption of electrodes that occurs during operation of an electric furnace, it is known to directly cool the portion of the electrode above the furnace lid with water. In FIGS. 5 and 6, which schematically show this measure, 1 is an electrode, 2 is a cooling water pipe, 3 is an electrode holder, and 4
indicates cooling water, and conventionally, in plan view (Fig. 5), electrode 1
The electrodes are cooled by spraying cooling water 4 parallel to the longitudinal direction of the electrodes 1 in a side view (FIG. 6).

[Problems to be Solved by the Invention] In steelmaking arc furnaces, electrodes are used at high temperatures and in dusty environments, but the dust adheres to the electrode surfaces, deteriorating the hydrophilicity of the electrodes. For this reason, even if cooling water is sprayed, it does not travel along the electrode surface and splashes, which drastically reduces the oxidation-preventing effect of the cooling water.Therefore, under any conditions, the cooling water cannot flow down the electrode surface. Although this is desirable, the current method is not fully satisfactory even if the amount of water (pressure) etc. are carefully controlled.

In order to increase the effect of direct water cooling for preventing electrode oxidation, the present invention employs a direct cooling method for electrodes in which cooling water always flows down the outer surface of the electrode, regardless of the deterioration of the hydrophilicity of the electrode surface. The purpose is to provide.

[Means for Solving the Problems] The method according to the present invention supplies most or all of the cooling water at an angle of 90° with respect to the tangent in the circumferential direction of the main surface of the electrode.
It is characterized in that the spray is applied downwardly onto the electrode at an angle of less than .degree.

In order to make it easier for the cooling water to travel across the electrode surface, the cooling water is not sprayed at an angle of 90° to the tangent to the circumferential direction of the electrode main surface, but at an angle of 90° to the tangent to the main surface of the electrode.
It must be sprayed at an angle of less than 0°.

The method of spraying cooling water according to the present invention includes spraying all of the cooling water at an angle (θ1) as shown in FIG. 1 (top view) and FIG. As shown in Fig. 4) and Fig. 4 (front view), spray the cooling water in a fan shape to spray the cooling water in the most part at an angle of less than 90° (θ1
) to spray. By spraying in this manner, the cooling water can be easily transmitted over the electrode surface, increasing the cooling effect. The angle θ1 in FIG. 1 is preferably about 30° to 50°, and the fan-shaped angle is preferably about 80 to 120°.

The cooling water must be sprayed downward onto the electrodes in order to increase its spread to the electrode surface, but the spray angle θ2 (Fig. 7) relative to the electrodes in this case is 30° to 30°.
Preferably around 70".

Further, the amount of water is preferably 20 to 5012/min/cm (electrode diameter).

Hereinafter, the present invention will be explained in detail with reference to Examples.

(Example) Example 1 When tested using the method described above, the electrode consumption rate (kg/electrode too) was as follows.

In a steelmaking arc furnace, direct water cooling is performed using 12 cooling water injection nozzles.The cooling water injection angle of the cooling ring is set as follows, and the cooling method shown in Fig. 1.2 and Fig. 7 is carried out. I did it.

Cooling water injection angle θ, = 45° θ2 = 60° Table 1 Table 2 Example 2 The following table shows the results of cooling the electrodes in a 60-ton electric furnace under the same conditions as Example 1.

(The following is a blank space) (Effects of the invention) According to the present invention, cooling water can be easily transmitted on the electrode surface,
Even in an environment where dust and oxidation are likely to occur, which reduce the cooling effect, a high cooling effect can be obtained, and the electrode consumption rate can be further reduced compared to the conventional method.

[Brief explanation of the drawing]

1 and 2 are plan and front views of an electrode and a cooling ring showing one embodiment of the present invention, and FIGS. 3 and 4 are plan views of an electrode and a cooling ring showing another embodiment of the present invention. FIGS. 5 and 6 are a plan view and a front view of an electrode and a cooling ring showing a conventional example, and FIG. 7 is an explanatory diagram of the cooling water spray angle with respect to the longitudinal direction of the electrode. 1, electrode body 2, cooling water pipe 3, electrode holding holder 4, cooling water

Claims (1)

[Claims] 1. In the direct water cooling method of electrodes in steelmaking arc furnaces, most or all of the cooling water is directed at an angle of less than 90° to the circumferential tangent of the main surface of the electrode. Let me hold it,
A method for cooling an electrode in an arc furnace for a steelmaking furnace, characterized in that the electrode is sprayed downward. 2. The electrode cooling method for a steelmaking arc furnace according to claim 1, wherein the angle is 30° to 50°.