JPH062889B2 - Distribution shoe - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a distribution chute for a blast furnace top charging device having a semicircular inner surface provided with a wear resistant lining.

[Conventional technology]

The distribution chute in the bellless blast furnace is an important device that distributes the charged raw material into the furnace, and the distribution chute suffers much wear due to slipping of ore or coke charged into the furnace. Therefore, a chute and the like having improved wear resistance have been proposed as seen in Japanese Patent Laid-Open Nos. 52-12605 and 58-189313. According to this proposal, Japanese Unexamined Patent Publication No. 52-12605 is currently used in many bellless blast furnaces, and a liner (fish plate) made of wear-resistant steel having protrusions is provided on the inner surface of the distribution chute. When the raw material is charged, part of the raw material remains between the protrusions and the cell lining is used to improve wear resistance.

On the other hand, Japanese Unexamined Patent Publication No. 58-189313 proposes to put a ceramic liner on each worn portion of the furnace top apparatus, which is not a distribution chute, and ceramics are generally vulnerable to impact, and moreover, they are welded and brazed like metal. Since such fixing means cannot be used, many proposals have been made for the fixing means. In this example, a method of fitting a ceramic liner to a metal guide or fixing with an adhesive is adopted.

[Problems to be solved by the invention]

However, in the former, although the wear resistance can be achieved to some extent, the calculated pig iron amount of 5 million ^pt , which is converted to a 4000 m ³ class blast furnace, has a life of about 1.5 to 2 years, and this life is not sufficient. Needless to say, the raw material passing through hits the protrusions and jumps, which adversely affects the distribution of the charged raw material.

Also, in the latter case, while the exterior that holds the ceramic liner, the iron skin, etc. keeps the correct shape, the adhesion is good and the impact resistance is also present, but once fired, thermal deformation occurs. Also, since a gap is created even when the liner is replaced, bending force acts on the liner, causing troubles such as breakage.

Therefore, it is an object of the present invention to provide a distribution chute that does not suffer from the above drawbacks.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention uses a ceramic liner as the lining material in a distribution chute in which a wear-resistant lining is applied to the inner surface of the semicircular outer surface, and a guide for pressing the side surface of the ceramic liner is provided on the inner surface of the outer surface. A plurality of them are provided along the longitudinal direction, the ceramic liner is fitted between the guides, and an irregular refractory material is press-loaded into the space between the back surface of the ceramic liner and the inner surface of the exterior.

[Action]

Since the problem of impact resistance is solved by the press-fitted irregular-shaped refractory, it is possible to extend the life of the chute by taking advantage of the characteristics of ceramics. Further, since it is not necessary to adopt the cell flying method, segregation of raw materials due to jumping can be avoided.

〔Example〕

 Hereinafter, embodiments will be described with reference to the drawings.

In FIG. 1 and FIG. 2, reference numeral 1 denotes a distribution chute arranged at the top of the blast furnace, and raw materials such as ore and coke charged into the blast furnace are formed on the inner surface of the exterior of the semicircular distribution chute 1. Evenly distributed from the top of the blast furnace. Generally, the surface of ore or coke is rough, and the inner surface of the distribution chute 1 is scraped each time a raw material is charged. If the degree becomes too severe, repair or replacement becomes necessary, and if the frequency is high, operating efficiency will decrease.

Conventionally, the fish plate is lined on the distribution chute,
The life of the chute has been extended, but it is more exhausted than other facilities, and it has the drawbacks as described above. Therefore, it is desirable to extend the life of the fish plate. At present, ceramics are most promising, and as shown in FIG. 3, they have much better wear resistance than other materials. Therefore, if this ceramic is used as a liner material, the shoot life can be further extended. However, ceramic soot generally has a brittle property and is weak against impact force, while the distribution chute used is subjected to considerable impact force when charging raw materials. Therefore, even if ceramics are used, it is necessary to line the inner surface of the distribution chute so that the ceramic liner is not damaged by the impact force.

Generally, an inner lining using an adhesive is considered, but since the distribution chute is at the top of the blast furnace and is always exposed to a high temperature atmosphere of 200 to 1000 ° C., the adhesive is deteriorated and the ceramic liner is expected to fall off. In addition, the above-mentioned
Even in the case of JP-A-58-189313, there is a portion lacking impact resistance, so it cannot be said to be preferable.

Therefore, in order to cover the impact resistance, the following measures are taken. In particular, in the present invention, the outer peripheral surface 2a of the exterior 2 is internally provided. Ceramic liner 3, ... is silicon nitride (Si ₂ N
₄ ), silicon carbide (SiC), or high alumina (Al ₂ O ₃ )
A flat liner is formed of ceramics having excellent wear resistance, heat resistance, and thermal shock resistance. The flat liner is used because it is necessary to prevent the segregation of the above-mentioned raw materials and because the ceramic itself has abrasion resistance, it is not necessary to intentionally adopt the cell flying method. In addition, since ceramics have a brittle property, if a protrusion or the like is provided, it will be damaged by collision with the raw material, which may cause a trouble.

Since the ceramic liners 3, ... Are fixed without using an adhesive, a fixed fitting relationship is provided between the ceramic liners 3, ..., which are fixed to the inner peripheral surface 2a by means such as welding. The guides 4, ... Are made of convex metal and are arranged on the inner peripheral surface 2a in a plurality and along the longitudinal direction. Both side surfaces of each guide 4 press the side surface of the ceramic liner 3 and thus protrude in a wedge shape. . On the other hand, the ceramic liner 3 has an inverted groove. Then, each ceramic liner 3 is fitted between the guides 4 and 4 from the end of the distribution chute 1. If it is simply inserted, a space is created between it and the exterior 2 and the impact resistance is inferior. Therefore, as shown in the figure, the irregular refractory 5 is filled in the space. The amorphous refractory 5 is made of, for example, SiO ₂ : 80% CaO: 20% and is kneaded with water, and at a pressure of 20 to 50 kgf / cm ² ,
It is press-fitted through a press-fitting hole (not shown) formed in the outer casing 2. Then, after confirming that the press-fitting refractory 5 oozes out from the gap between the ceramic liners 3 and 3 on the inner surface of the distribution chute 1, the press-fitting is stopped, the press-fitting position is changed, and the same operation is repeated. To do. The amorphous refractory 5 fills the space and makes the ceramic liners 3, ... Have rigidity, so that the impact resistance is enhanced.

〔The invention's effect〕

As described above, according to the present invention, since the irregular shaped refractory covers the impact resistance, which is a weak point of ceramics, the ceramic liner can be used and the life of the chute can be greatly extended. In addition, since the use of the ceramic liner eliminates the need for the cell flying method, segregation of the raw material due to jumping can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a transverse sectional view of FIG. 1, and FIG. 3 is a graph showing the amount of wear of each material. is there. 1 ... Distribution chute, 2 ... Exterior, 2a ... Inner (circumferential) surface, 3
… Ceramic liner, 4… Guide, 5… Irregular refractory.

Claims (1)

[Claims] 1. In a distribution chute having a wear resistant lining on the inner surface of a semicircular outer casing, a ceramic liner is used as the lining material, and a plurality of guides for suppressing the side surface of the ceramic liner are provided along the inner circumferential surface of the outer casing along the longitudinal direction. The distribution chute is characterized in that the ceramic liner is fitted between the guides and an irregular refractory material is press-fitted into the space between the back surface of the ceramic liner and the inner surface of the exterior.