JPH0539518A - Instrument for detecting water leakage in melting furnace - Google Patents

Abstract

PURPOSE:To provide mechanism, which can safely apply a panel type water cooling jacket in a refractory for preventing large wearing due to development of vigorous reaction at high temp. in a melting and refining furnace. CONSTITUTION:The panel type water cooling jacket 2 is arranged in the refractory and below the jacket 2, a leaked water collecting box 11 is fitted and in a water basin 18 for detecting water leakage in lower part of the box 11, electrodes 13, 14 for detecting continuity are arranged. By this method, the panel type water cooling jacket can be safely applied in the refractory.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a panel type water cooling system for the rapid wear of refractory wall near the height of the smelt in a smelting reduction furnace in which refining slag is inevitably extremely hot. The present invention relates to a device related to a technique for avoiding wear by a jacket.

[0002]

2. Description of the Related Art As a method for extending the life of the furnace body of a converter-type vase having a water-cooled lance-type pure oxygen top blowing device, a proposal has been made in JP-A-63-76811. Yes, here, the water cooling jacket is attached to the outside of the iron shell of the furnace body, and has the function of extending the life of the furnace wall refractory surrounding the liquid surface of the molten metal on the furnace inner wall surface. is not.

[0003]

It is possible to extend the life of a furnace wall refractory which is equipped with a water cooling jacket inside the iron shell of the furnace body and surrounds above the liquid level of the molten metal on the inner wall surface of the furnace. In order to reliably use this water cooling jacket, it has been desired to provide a device for detecting water leakage at an early stage.

[0004]

SUMMARY OF THE INVENTION A melting furnace leak detection device according to the present invention is a converter type furnace for melting and refining a metal having a water-cooled lance type pure oxygen top blowing device. Leakage receiving water collecting basin, which is provided in the lower part of the panel-type water-cooling jacket provided in the furnace wall refractory surrounding the liquid surface immediately above and the lower part is covered, and the leakage detecting water The reservoir is provided with a conduction detecting electrode and a drain pipe arranged at a position higher than the conduction detecting electrode.

[0005]

[Function] When a water leak occurs in the water cooling jacket, the cooling water flows into the lower part of the water collecting receiving water collecting basin, and the flowing water is collected in the water leak detecting water reservoir, and conduction is generated between the conduction detecting electrodes. I can do things.

[0006]

EXAMPLE FIG. 1 is a diagram for explaining the profile of a converter-type furnace for melting and reducing and refining metal, to which a melting furnace water leak detection device according to an embodiment of the present invention is attached. In the figure, reference numeral 1 is an iron shell of a furnace for melting and reducing and refining metal.
2 is a panel type water cooling jacket. 3 is a refractory brick. As the refractory brick, a chromium-magnesia-carbon type brick is generally used. Reference numeral 4 is an amorphous refractory material. A tar-Dolomite stamp is generally used as the amorphous refractory. Reference numeral 5 is a fireproof heat insulating board that directly contacts the iron skin 1. Reference numeral 6 is a lance, which is a water-cooled type, and it is possible to blow various kinds of powder together with pure oxygen. 7
Is molten steel, and in addition to ordinary steel, alloy steel such as stainless steel can be directly manufactured using metal ore as a raw material. 8
Is a smelter for refining. It is inevitable that the refining slag becomes extremely hot in a smelting reduction furnace for melting and reducing and refining metals. The metal ore is melted and reduced and refined in this smelting slag. Therefore, the inner wall of the furnace where the smelting slag 8 contacts is
Wear is severe. While the refractory bricks 3 are present on the inner wall, the panel-type water-cooling jacket 2 cools them from the back, so that the temperature gradient of the inner wall of the furnace where the smelting slag 8 is in contact becomes steep, and the heat transmission coefficient of the surface of the inner wall of the furnace is high. Does not change significantly, so the surface temperature of the inner wall of the furnace also drops, so the smelting slag 8
The wear of the inner wall portion of the furnace in contact with is suppressed. Further, when the inner wall portion of the furnace in contact with the smelting slag 8 is worn and the panel type water cooling jacket 2 is exposed as shown by the dotted line in the figure, the solid phase having a very low heat transmission coefficient on the surface of the panel type water cooling jacket 2. The slag forms a solidified layer, which prevents wear on the inner wall. Reference numeral 9 represents pure oxygen or various powders blown by the lance 6.

FIG. 2 is an explanatory view showing a cross section of the melting furnace leak detection device according to one embodiment of the present invention. FIG. 3 is an explanatory view showing the elevation of the melting furnace leak detection device of one embodiment of the present invention. In the figure, 1, 2, 3, 4 and 5 are as described above. Reference numeral 11 is a leak collecting water basin. Reference numeral 18 denotes a water leak detecting basin provided at the lowermost portion of the water leak collecting and collecting basin 11. Reference numeral 13 is a lower water leak detection electrode. Reference numeral 14 is an upper water leakage detection electrode. 12 is a drain pipe. When the panel type water cooling jacket 2 is cracked or the like and starts to leak, the leaked water drops into the leaked water collecting basin 11. Next, the leaked water collects in the leak detection water reservoir 18 at the lowermost part. 17 is the leaked water collected. When the leaked water 17 gradually increases in water volume and reaches the upper leak detection electrode 14, a closed circuit occurs between the lower leak detection electrode 13 and the upper leak detection electrode 14. At this time, since a voltage of about 30 V is applied between the lower water leak detection electrode 13 and the upper water leak detection electrode 14, it is possible to detect that the current has flowed and the water leak has started. The water flowing out from the drain pipe 12 flows into the drain pit through the drain pipe 16 and further through the solenoid valve 15.

According to the present invention, when a crack or the like occurs in the panel type water cooling jacket 2 and water leakage starts, it can be detected very early, so that the operation of the melting and reduction refining furnace can be stopped and repaired, and an explosion accident occurs. It is possible to avoid such problems and secure safe work even if the panel-type water cooling jacket 2 is adopted.

[0009]

According to the present invention, it is possible to avoid an explosion accident due to water leakage of the water cooling jacket, so that it is possible to attach the water cooling jacket to the smelting reduction furnace without anxiety.

[Brief description of drawings]

FIG. 1 is an explanatory view of a profile of a converter type furnace having a panel type water cooling jacket to which a melting furnace leak detection device of the present invention is attached.

FIG. 2 is an explanatory diagram showing a cross section of a melting furnace water leak detection device according to an embodiment of the present invention.

FIG. 3 is an explanatory view showing an elevation of a melting furnace water leak detection device according to an embodiment of the present invention.

[Explanation of symbols]

 1 Iron-skin 2 Panel-type water-cooling jacket 3 Fire-resistant bricks 4 Amorphous refractory 5 Fire-resistant insulation board 6 Lance 7 Molten steel 8 Slag 9 Slag 11 Leakage collection water basin 12 Drain pipe 13 Bottom leak detection electrode 14 Top leak detection electrode 15 Solenoid valve 16 Drain piping 17 Leakage water 18 Leakage detection water reservoir

Claims (1)

[Claims] 1. A converter-type furnace for melting and refining a metal having a water-cooled lance type pure oxygen top blowing device, wherein the furnace wall is provided in a refractory wall surrounding a portion immediately above the liquid level of the molten metal. In the panel type water-cooling jacket, a water reservoir for water leakage detection, a water leakage collecting water collecting basin provided at the lower portion and covered at the bottom, and an electrode for conduction detection in the water reservoir for water leakage detection,
And a drain pipe disposed at a position higher than the continuity detecting electrode.