JPS6112807A - Furnace-port metal fitting for blast furnace - Google Patents

Abstract

PURPOSE:To facilitate the exchange of a furnace-port metal fitting, to reduce the thermal influence on the fitting, and to improve the durability by fixing the furnance-port fitting directly to the iron skin at the outer surface of the furnace with a metallic member, and cooling by sprinkling water onto the iron skin. CONSTITUTION:An outside water sprinkling pipeline 10 is provided avove a water receiver part 7 at the outside of an iron skin 3 to cool the skin 3 with water, and a detaining metal fitting 5 is furnished to the inner surface of the iron skin 3. A metal receiver fitting 9 to be engaged with the fitting 5 is formed on the rear surface of a furnace port metal fitting 1, and the fitting 5 and 9 are engaed to fix the fitting 1. A castor material 6 is packed between the fitting 1 and the iron skin 3, and a high heat-conductivity material is used as the castor material 6. The receiver part 7 is formed at the lower part of the iron skin 3, and water can be discharged into a water discharge trough 8. The uppermost fitting 1 is directly detained by a horizontal member at the upper part of the iron skin 3. The fitting 1 is considerably large-sized as compared with the conventional one, and the lower fitting 1 is abutted directly on the member 7b forming the receiver part 7. Consequently, the fitting 1 is almost unaffected even in case brick 4 should fall off.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the creation of a furnace mouthpiece for a blast furnace, in which the upper part of the blast furnace repulses and distributes the input raw material, and also makes it easy to replace the furnace mouthpiece that protects the furnace wall bricks. The aim is to reduce the thermal effects, improve durability, and make it possible to freely select the material for metal fittings.

[Industrial application field]

Furnace mouth hardware installed at the mouth of a blast furnace to repulse and distribute the charged raw material.

[Conventional technology]

BACKGROUND OF THE INVENTION At the mouth of a blast furnace, a metal fitting called a wear ring plate is installed in order to repulse and distribute the charging material that has fallen from the top through a bell or a rotating chute. In other words, conventionally, such furnace mouth fittings have been installed through refractories, and are designed to protect the furnace wall bricks by repelling the charging material as described above. The structural relationship is as shown in FIG. 3, and the above-mentioned furnace mouth fittings 15 are installed below the large pel 11 and moopapro armor 12 portions at the top of the furnace, and the specific mounting structure is not explained separately. As shown in FIG. 4, the caster refractories 17 in the steel shell 3 and the furnace wall bricks 14 are installed using reinforcing bars 16 and the like.

[Problem that the invention seeks to solve]

However, even if the conventional furnace head metal fittings mentioned above have a certain level of durability, they require intermediate repairs or replacement due to the extended life of the blast furnace. Repairing or replacing the internal parts, or attaching other protective metal fittings to the damaged parts must be carried out in an adverse environment with high-temperature harmful gases, and therefore must be extremely difficult. In addition, the lifespan of such conventional furnace mouth metal fittings is determined by wear resistance due to mechanical properties at high temperatures and wear and tear of the furnace wall bricks supporting the metal fittings, or sliding down and falling off due to partial falling off of the furnace wall bricks. In other words, although it is normally used in an atmosphere of 500 to 500 degrees Celsius, it must be exposed to hot gas of 600 to 800 degrees Celsius when the furnace condition is malfunctioning. The physical properties are generally 5000% higher than at room temperature.
It deteriorates in the surrounding atmosphere, and its hardness and toughness, which particularly affect wear resistance, are halved. Therefore, it is important to properly cool the metal fittings in order to increase their durability, but as mentioned above, it is difficult to provide a cooling effect for the metal fittings installed with firebrick, so the materials are upgraded to withstand high temperature conditions. Even if the materials are made high-quality, they will still suffer from cracking and deformation due to the mass effect, so each block of hardware must be made smaller as shown in Figures 4 and 5. , it is not possible to adopt large blocks. Furthermore, since the conventional furnace mouth metal fittings mentioned above have a construction structure that is mounted on the upper brick of the shaft, if the bricks are worn out or parts of the metal parts fall off, the fitting structure of the metal fittings will be directly affected by it and will slide down. If this occurs and is not repaired, it will fall off, and this may cause wear and tear on the hardware itself (but it does cause a large number of trips that shortens its lifespan).

However, in the above-mentioned cases, replacement and repair work requires not only rebuilding the hardware but also the connecting structure with surrounding refractories such as bricks and casters.
This would have to be a large-scale construction job, and the work would be extremely difficult since it would be exposed to the harsh environment inside the furnace mouth as described above.

"Structure of the Invention" [Means for Solving the Problems] The present invention was developed after consideration to solve the problems of the conventional products as described above. A furnace mouth hardware mechanism for a blast furnace is characterized in that a furnace mouth hardware is locked to a shell by a metal member, and a cooling means is provided for cooling the steel shell by spraying water from the outside.

[Effect]

Since the furnace mouth hardware is secured to the iron skin covering the outer surface of the furnace body by a metal member, the furnace mouth hardware becomes extremely stable, and is effectively prevented from falling off due to the collapse of bricks, etc. In addition, since a cooling means is provided for cooling the above-mentioned iron shell by spraying water from the outside, a favorable cooling effect is provided to the furnace mouth metal fittings through the anvil, reducing the influence of high temperature conditions inside the furnace. do.

[Fu example]

To explain the specific embodiment of the present invention shown in the attached drawings, when attaching the furnace mouth fittings below the large pel 11 and movable armor 12 as shown in FIG. 3, as shown in FIG. At the same time, an external water sprinkling pipe 10 is disposed outside the steel shell 3 on a cooling water receiving portion 7 (described later) to achieve water cooling, and a locking fitting 5 is provided on the inner surface of the steel shell 3, and the locking fitting 5 is engaged with the locking fitting 5. A matching receiving fitting 9 is formed on the back surface of the furnace mouth fitting 1,
The locking metal fittings 5 and the receiving metal fittings 9 are locked and the furnace opening metal fittings 1 are installed.
A caster material 6 is filled between the furnace mouth hardware 1 and the iron skin 3, and this caster material 6 is made of a material with high thermal conductivity. A cooling water receiving part T is formed at the lower part of the iron shell 3, and a drainage lower a is also configured to drain water into a drainage gutter 8, and the uppermost furnace mouth metal fittings are formed on the horizontal member at the upper part of the iron shell 3. It is directly locked against the

The furnace mouth metal fittings 1 are as shown in Fig. 2, and No. 4.5.
It is considerably larger than the conventional one shown in the figure. In addition, the lower furnace mouth hardware is the forming member 1 of the cooling water receiving portion 7.
It is connected to b.

That is, according to the present invention, the furnace mouth metal fittings 1 are directly connected and attached to the iron shell 3, and the furnace mouth metal fittings 1 provided in multiple stages directly apply loads and impacts to the shaft upper brick 4. Even if a brick 4 or the like were to fall off, the furnace opening metal fittings 1 would hardly be affected by it, creating a stable and strong attachment relationship.

"Effects of the Invention" According to the present invention as described above, the furnace mouth hardware 1 is the iron shell 3.
It is clear that an extremely stable mounting relationship can be obtained since the cooling means 10 is directly engaged with the metal member.
Since the cooling effect on the steel shell 3 can be effectively applied to the furnace mouthpiece 1, the influence of the atmosphere in the furnace can be avoided, and therefore the material selection for the furnace mouthpiece 1 can be freely selected. By avoiding the increase in costs caused by using special high-quality materials for heating, and by reducing the effect of heat inside the furnace, it is possible to make a single piece of hardware larger, and the connections between blocks (joints) can be made larger. ] is reduced, reducing uneven wear in the gaps between the blocks, and since each hardware is attached to the iron skin and is unrelated to the bricks, the weight of the hardware 1 and the impact of the repulsion of the charged material against the hardware are reduced. The load on the bricks is reduced without any force being transmitted to the brick layer, and the hardware 1 will not fall off even if the lower brick falls off (in addition, the work of replacing the hardware 1 when it wears out is also easier). This invention has great advantages in that it is extremely easy to achieve by the partial incision described in step 3, and is an invention that has gained great popularity in the industry.

[Brief explanation of drawings]

The drawings show the technical content of the present invention; Fig. 1 is a partial cross-sectional view of a part of the blast furnace according to the present invention, Fig. 2 is a front view thereof, and Fig. 3 is a cross-sectional view of the blast furnace in general. FIG. 4 is a sectional view showing a conventional furnace mouth metal fittings mounting structure, and FIG. 5 is a front view thereof. However, in the Kowara drawing, 1 is the furnace opening hardware, 3 is the iron shell, 4 is the brick, 5 is the locking metal fitting, 6 is the caster material, 7 is the cooling water receiver, 8 is the drain gutter, 9 is the metal fitting, 10 indicates a water sprinkler pipe. Patent applicant: Nippon Kokan Co., Ltd. Inventor: Noboru Seto
Hidenori Takamura 2nd! ! d 4th round, f heir

Claims (1)

[Scope of Claims] 1. A furnace mouth metal fitting is secured to a steel shell covering the outer surface of the furnace body by a metal member, and a cooling means is provided for cooling the steel shell by spraying water from the outside. A furnace mouth metal mechanism for blast furnaces. 2. The furnace mouth metal mechanism for a blast furnace according to claim 1, wherein a receiving metal fitting formed on the furnace mouth metal fitting is engaged with a locking metal fitting provided on the iron shell. 3. The furnace mouth metal mechanism for a blast furnace according to claim 1, wherein a caster material is filled between the iron shell and the furnace mouth metal.