JPS58161714A - Instalation for preventing scattering of molten iron or the like - Google Patents

Abstract

PURPOSE:To prevent the damage of the inside wall of an installation for preventing scattering provided on the tapping spout of a blast furnace by splashes, by ejecting gas or steam in the flow direction of the molten iron splashes on the inside wall of said installation. CONSTITUTION:An installation 5 having an arc shape or U shape in section for preventing scattering is mounted in the upper part of a tapping spout 4 mounted in the outlset of the tapping spout 2 of a blast furnace 1. The refractories on the inside wall of the installation 5 are damaged in a short time by the splashes of the molten iron and molten slag scattering from the tap hole 2 in the stage of tapping of molten iron. In order to prevent such damage, many pipes 6 are disposed at suitable intervals on the inside circumferential surface of the installation 5 toward the down stream of the spout 4 and air or the like is ejected therethrough to form an air curtain on the inside wall surface of the installation 5, whereby the damage of the refractories on the inside wall by the splashes of the molten iron and molten slag is prevented and the service life of the installation for preventing scattering is prolonged.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is primarily concerned with equipment installed at the tap or slag opening of a blast furnace to prevent the scattering of bath iron, molten slag, etc.

For example, a taphole or a taphole (hereinafter referred to as a taphole, etc.) of a blast furnace is provided with a gutter through which hot metal or molten slag (hereinafter referred to as a hot metal, etc.) flows out, and a hole-opening machine such as a taphole is provided. The furnace is opened to allow the hot metal etc. inside the furnace to flow out, but because the hot metal etc. splashes and is dangerous, old scattering prevention equipment has been installed in the planting soil in the direction of flow of the hot metal etc. This scattering prevention equipment is generally made of a fixed or unshaped refractory and has an arcuate or U-shaped cross section.

By the way, the large internal components of this anti-scattering equipment are subject to significant erosion due to splashes from #boats and the like and spalling damage due to high heat (approximately 1550 C), and must often be repaired or replaced. - According to the results of the survey, the occurrence of splash differs depending on the type of slag, and changes at the beginning, middle, and end of the slag, so the impact on refractories differs, including 1111 tons. 'Specific range of large objects, e.g. 2m from the end of the blast furnace side of the scattering prevention equipment in the flow direction of the splash.
It became clear that the damage was greatest between ~6m and 6m.

For this reason, the service life of internal refractories is extremely short and must be frequently repaired or replaced, resulting in the amount of refractories used per ton of tapped iron (hereinafter referred to as basic unit). 0.15k), which is not only extremely expensive, but also increases the cost of repair and replacement, so it has been desired to take measures to prevent formation of refractories.

In order to solve the above-mentioned problems, the present invention blows out air, steam, or other inert gas along the inner wall of the splash prevention equipment in the direction of the flow of the splash, and protects the refractory by forcibly cooling it. The purpose is to reduce the basic unit by taking advantage of this.

Fig. 1 is a side view of an embodiment of the present invention, and Fig. 2 is a cross-sectional view of the embodiment. A large diameter portion 6 is formed on the outer wall' side at the mouth or the like. 4 is a gutter provided below the taphole 2 through which hot metal etc. flows out; 5 is a scattering prevention device with an arcuate or U-shaped cross section provided at the opening of the gutter 4 to cover it; is lined with refractory material. Reference numeral 6 denotes nine pipes arranged at appropriate intervals on the inner peripheral surface of the scattering prevention equipment near the tap hole, etc., and this vibro is connected to a blower. 7 is a temperature detector for detecting the temperature of the inner wall of the scattering equipment.

In the present invention configured as described above, air is sent to the slag by a blower at the same time as the slag is tapped, and the slag is forcibly cooled in the flow direction of the splash from each vibro, and the slag is forcibly cooled along the inner wall. A so-called air curtain is formed to prevent droplets from adhering. Therefore, the temperature of the inner wall is maintained relatively low, and the inner wall is hardly damaged by splash, so that the life of the inner wall refractory can be extended by a large amount of gKg.

In addition, if the temperature of the inner wall refractories is detected by the temperature detector 7 installed on the inner wall of the scattering prevention equipment and the air flow rate is controlled in accordance with this temperature, the inner wall refractories can always be maintained at an appropriate temperature. .

Next, the present invention will be explained in detail.

Taphole, etc. (') vk48 ws 1 Diameter of large diameter part of taphole, etc. 250 to 500 days Distance between furnace wall and end of scattering prevention equipment 0.5 m Length of scattering prevention equipment 8m Installation of pipe Location: 1 m from the end of the taphole, etc. of the equipment Outer diameter of pipe: 25 to 150 Number of pipes: 1 to 4 Temperature of inner wall refractories
As a result of carrying out the test at 200C to 700C as described above, damage to the refractories on the inner wall of the scattering prevention equipment was significantly reduced, and the service life could be extended. The basic unit due to this is [ILo
5 kl, which was a significant improvement over the conventional (unit consumption: 0.15 kl) K.

In the above description, an example is shown in which a pipe is provided on the inner wall of the anti-scattering film. However, it is not limited to a pipe, and a hollow cylinder or the like may be provided, and a nozzle may be provided at the tip. Moreover, although the case where air is jetted out has been described, water vapor or other inert gas may be jetted out.゛In the case described above, the case where the inner wall of the scattering prevention equipment is cooled in all directions by air, etc. is described.
Alternatively, the upper part and the single part (legs) may be cooled. In this case, the upper part may be cooled with air, and the lower legs may be cooled with water using separate pipes installed inside the refractory. Done 2. Note that the location of the pipe, etc. varies depending on the distance from the taphole, etc., the size of the scattering prevention equipment, and the length of the pipe.It is usually located 1 to 4-3 degrees from the end of the furnace side of the equipment. It is preferable to do so, and the point is that the location may be any position that can effectively cool the area where the refractories on one side of the equipment are subject to wear and tear.

Furthermore, in the above explanation, we have described the case in which the inner peripheral surface of the anti-scattering equipment is lined with anti-crackling material, but the parts that are particularly prone to wear and tear due to splashing are water-resistant.

Metals (e.g. cast steel, copper, etc.) cooled with steam, air, etc. may be used, or only cooling pipes (boiler tubes, copper pipes) may be used instead of cooling metals, and refractories (shaped and unshaped) may be used. (refractories) may be cooled. By cooling in this way, the service life of the shatter prevention equipment can be further extended.

As is clear from the above explanation, according to the present invention, it is possible to greatly extend the life of the refractories of the scattering prevention equipment, so not only can the basic unit be significantly reduced compared to the conventional method, but also repair and replacement Since the cost of rounding, etc., is also reduced, the effect of implementation is significant.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of an embodiment of the present invention, and Fig. 2 is its A-A
FIG. 1: Furnace wall, 2: Tap hole, etc., 4: Gutter, 5: Splash casting equipment,
6: Pipe, 7: Temperature detector. Agent Patent Attorney Masaru Sato Year 1 Figure 859 - 2nd rFI

Claims (1)

[Claims] Hot metal scattering prevention equipment for hot metal, etc. installed close to a hot metal taphole, characterized by spouting air, steam, or other inert gas in the flow direction of the splash along the inner wall of the equipment. Scattering prevention equipment such as.