JPS63241108A - Method for reducing generated slag in converter - Google Patents

Abstract

PURPOSE:To reduce generated dust quantity without reducing blowing capacity by winding a coil to a waste cooled fin arranging in a exhaust gas dust for a converter as electric magnet, sticking the generated dust for the converter to the electric magnet and recovering the dust. CONSTITUTION:At the time of blowing the molten steel 3 in the converter by the top blowing lance 2, the generated exhaust gas and dust are introduced into upper part through a hood 4, seal jacket 5, etc. Then, water cooled fins 7 are arranged in the inner face of the flue for the seal jacket 5 or boiler 6, etc., and by winding the coil 8 to the water cooled fins 7, DC current is conducted and the water cooled fins 7 sticks and catches the dust as the electric magnet. By returning back the caught dust again in the converter 1 after tapping, reduction of the generated dust in the converter is executed and the yield is improved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for reducing dust generated in a converter, and more specifically, a method for reducing the amount of dust generated in a converter without inhibiting the steelmaking reaction in the original converter blowing. The present invention relates to a method for reducing dust generated in a converter.

[Conventional technology]

Converter blowing generates exhaust gas containing a large amount of flammable components (mainly CO gas), but this exhaust gas contains a large amount of dust, and in order to remove this dust, the converter requires exhaust gas treatment. Facilities included. This exhaust gas contains metal fume consisting of molten steel components and fine dust, and the metal fume turns into fine dust during the cooling process. Approximately 60 to 80% iron is contained in dust, and the reduction in yield due to dust is 0.6 to 0 in top-blown converters (LD) and top-blown oxygen bottom-blown inert gas converters (LD-KGC, etc.).゜8%,
In a top-bottom blowing oxygen converter (K-BOP), it is around 0.8 to 1.2%, and although the generated dust is reused, its added value is low, and the generation of dust is a major loss in converter blowing. Met.

However, the amount of dust generated in converters has decreased due to a decrease in the amount of slag due to the rationalization of converters in recent years (simplification of converter functions through hot metal pretreatment) and an increase in converter stirring capacity due to an increase in the amount of bottom-blown gas. It is on the rise.

For example, the technology for reducing dust during blowing is disclosed in Japanese Patent Application Laid-open No. 6
It is disclosed in Japanese Patent No. 0-262912.

[Problem that the invention seeks to solve]

In the above-mentioned Japanese Patent Application Laid-Open No. 60-262912, the amount of dust is reduced by manipulating factors that directly affect blowing, such as adjusting the amount of slag in the furnace and top-blowing lance blowing. Changing the furnace operating conditions would also reduce the original converter blowing function, and it is not possible to achieve a result that is compatible with maintaining the original steelmaking function of the converter and reducing the amount of dust generated. The current situation was difficult.

The present invention was proposed in order to solve these problems, and the present invention has been proposed to solve these problems. without reducing J function.
The object of the present invention is to provide a method for reducing dust generated in a converter, which reduces the amount of dust generated completely independently of the reaction within the converter.

[Means for solving problems]

The present invention is intended to solve the above-mentioned problems, and employs the following method. In other words, an electromagnet is created by wrapping a coil around one or more water-cooling fins installed in the flue that guides the gas generated in the converter from the furnace mouth to the exhaust system. This method involves attaching the steel to an electromagnet and capturing it, and then collecting it again in the converter after tapping is completed.

[Effect]

The present invention will be described in detail. Fig. 2 shows a cross-sectional view of an example in which the method of the present invention is applied to a top-blown converter. led to the top,
It is then guided to a dust separator and exhaust gas recovery device.

In the present invention, water cooling fins 7 are installed on the inner surface of a flue such as a seal jacket 5 or a boiler 6 provided above the furnace mouth to remove dust in the exhaust gas, and a coil 8 is attached to the water cooling fins 7 as shown in FIG. In winding, the water cooling fins 7 are used as electromagnets by applying direct current to the coil 8, and the dust is attached to and captured by the electromagnets, thereby reducing the amount of dust generated in the converter.

That is, the dust generated during converter blowing is guided by exhaust gas to the flue such as the hood 4 and seal jacket 5, but at this time, the electromagnetic force generated from the water cooling fins 7 removes most of the dust passing through the flue. is captured by the water cooling fin 7. During the converter blowing, the water cooling fins 7 are energized throughout, and after the tapping is completed, the energization is stopped and the dust captured by the fins 7 is returned to the converter l.

〔Example〕

A 250 ton top-bottom blown oxygen converter (K-HOP) has water cooling fins 7 as shown in Fig. 6 installed only in the seal jacket 5 part of the exhaust gas flue as shown in Fig. 2.
The amount of dust generated during converter blowing was measured. The measurement results are shown in FIG. 1, and the blowing specifications at this time are as follows.

Hot metal blending ratio 93.5-95.0% Blowing start temperature
1250-1330°C Blow-off temperature 1630-1660°C Blow-off molten steel composition CO, 04-0.08%t tr Mn 0.10-0.22% P 0.015-0.023% SO, 005-o, o io% blowing oxygen amount
1290ON Layer 3 - 1350ON Otori 3 As shown in Figure 1, the amount of dust generated during blowing is approximately 1/3 compared to the conventional example.
decreased to This also reduces the iron source yield in converter blowing to approximately 0.
．． We were able to improve this by 6%.

Although the above-mentioned embodiment is an example in which the water cooling fins 7 are provided on the seal jacket 5, they may be provided on the boiler side as shown in FIG. 4. [Effects of the Invention] The present invention can significantly reduce the amount of dust generated, completely independent of the reaction inside the converter, without reducing the blowing function of the converter. It has an excellent effect on improving iron source yield in wrought iron.

[Brief explanation of drawings]

Fig. 1 is a graph showing the implementation results of the present invention, Fig. 2 is an explanatory diagram of a cross section of an example in which the method of the present invention is applied to a top-blowing converter, and Fig. 3 is a cross-sectional view taken along line AA in Fig. 1; Figure 4 is B-B in Figure 1.
5 is an explanatory diagram of the electromagnet, and FIG. 6 is an explanatory diagram of the water cooling fin of the embodiment. ■...Converter body 2...Top blow lance 3...Steel bath 4...Hood 5...Seal jacket 6...Boiler 7...Water cooling fins 8...Coil

Claims (1)

[Claims] 1 A converter generator characterized in that a coil is wound around a water cooling fin installed in the exhaust gas flue of a converter to form an electromagnet, and dust generated in the converter is attached to the electromagnet, captured, and collected in the converter. How to reduce dust.