JPS5833087A - Lining structure of furnace wall - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for lining the furnace walls of blast furnaces, hot blast furnaces, other heating furnaces, melting furnaces, and molten metal containers such as ladle used in the steel industry by pouring monolithic refractories. Regarding the structure of the inner lining.

The lining of the furnace walls of the above-mentioned furnaces and molten metal containers is increasingly being constructed using undefined large-sized 01EL construction. For pouring construction, as is well known, monolithic refractories are kneaded with 5-8% of true moisture additive, and then a material with good fluidity is mixed, a formwork is installed, and a predetermined 09gK is poured, followed by curing and The lining is used by preheating and raising the temperature after drying and de-framing, but the lining is not eroded during operation, and is not fireproof due to thermal shock, penetration of slap, deterioration of refractories, expansion, and contraction, etc. Cracks occur in the refractory material, causing it to peel and fall off, often shortening the useful life of the furnace.In order to prevent this refractory material from falling off, ISK metal studs were traditionally embedded. . For example, in the case of the pouring construction of a blast furnace wall that has recently been attempted, Figure 1 shows a partial longitudinal cross-section of a Korean furnace wall with a soft outer shell of 1 and 2 metal studs of Y type, VW, etc. A furnace wall is built using monolithic refractory material 3, which is welded together in large numbers, embedded in it, and poured in repeatedly. In addition, 4
is cooling for cooling the refractories on the furnace wall.

During long-term operation of the blast furnace, this metal stud 2 is effectively engaged with the unshaped large-sized material 3 and maintains its strength to prevent it from falling off even if cracks occur in the refractory material. As a result, the strength decreases and a low melting material is produced in response to the refractory material. On the other hand, the carbon monocarbon gas in the furnace is 200
-00m The decomposition of +O deposits carbon, which causes the refractories to become brittle, and combined with the coal production into metal studs, the ability to prevent falling off deteriorates. - Facilitate. In the case of the furnace 110, which is a molten metal container that moves or reacts with high-temperature molten steel, the inside of the furnace 110 becomes high temperature, so the metal stud changes relatively quickly and cannot perform its original function. No〇On the other hand, there is a conventional furnace wall lining structure in which various types of anchor bricks are fixed to the outer shell and embedded in order to prevent the undefined refractory construction from falling off, but with this structure, the neck of the anchor brick breaks. There are many things. This is thought to be because a temperature difference occurs between the inside and outside of the lining structure during operation, and while the inner surface is stretched, compressive stress acts on the back surface, causing the movable and weak anchor bricks to break.

Jin's invention is a refractory material that overcomes the drawbacks of conventional furnace walls that are fixed and embedded with metal studs or anchor bricks, and can withstand high-temperature use. The purpose is to obtain a furnace wall lining structure that prevents falling off.

The gist of this is a furnace wall lining structure consisting of a hexagonal, large-sized rod-like body with convex portions formed at both ends, each individually extending in the direction of the wall thickness.

Below, the lining structure of the present invention will be explained based on the drawings. Figures 2 and 3 show an embodiment for a blast furnace wall, and Figure 2 shows a vertical cross-section wI of a part of the furnace wall. Figure, 3rd
Same as Zusha, it is a cross-sectional view.

Reference numeral 5 denotes a refractory rod-shaped body that is embedded without being fixed in the monolithic refractory material 3, and due to its shape, both ends are closer to each other than the other parts, as shown in the perspective views (1) to (4) in Fig. 4. They have a large, swollen, cylindrical shape, and are implanted at appropriate intervals with their length aligned with the radial direction of the blast furnace. Therefore, even if a crack occurs in the monolithic refractory material 3 during operation, and a peeling phenomenon occurs along with this, and there is a danger that the monolithic refractory material 3 will fall into the furnace, the monolithic refractory material will remain in a state where both ends of the refractory rod 50 are swollen. 3, it becomes a strong resistor against falling l/c.

The refractory rod-shaped body is preferably made of a material that does not lose its strength at high temperatures, as well as a material that does not impair its coherence with the monolithic refractory material 3, such as high alumina, hard clay, or silicon carbide.

Table 1 shows an example of the compatibility between the monolithic refractory material and the refractory rod of the present invention.

In other words, the quality of the refractory rod 5 is determined to meet the usage conditions of the furnace, and cracks with a diameter of 65 mm or more occur more frequently on the inside of the furnace than in the wall thickness. Although the name for constructing the lining structure of this invention differs slightly depending on the type of furnace and container, basically the construction method is a jet construction form, and the construction method is as follows:
They are arranged in rows from the top at a predetermined arrangement pitch.

Since the present invention has the above-described structure, the refractory material embedded in the monolithic refractory material without determining #/cgi will not decrease in strength or break due to internal stress during operation, and will not be damaged. The reaction between the shaped refractory material and the furnace gas or molten metal is slow and does not cause embrittlement, and the protrusions on both ends prevent the unshaped refractory material from falling off, making it suitable for use on the furnace walls of various nitrogen furnaces and molten metal containers. The service life can be extended.

[Brief explanation of drawings]

FIG. 1 is a partial vertical cross-sectional view of a conventional furnace wall lining structure, FIGS. 2 and 3 are partial vertical cross-sectional views and partial cross-sectional views of a blast furnace wall showing an embodiment of the present invention, and FIG. Shell iron skin, 3.
...Unshaped refractory material, 5...Refractory rod-shaped body. Agent Patent Attorney Masaru Sato Figure 1 Figure 2 Figure 3 Figure 4 (1) (2) (3) (4)

Claims (1)

[Claims] Furnace wall lining structure is made of monolithic refractory material that is constructed by pouring a screw-shaped refractory rod-shaped body with convex portions at both ends inside the wall in the direction of wall thickness.