JPH0569594U - Electric furnace brick floor structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To have at least one tuyere on the bottom and mainly consist of bricks, which can fully exert the effect of preventing damage caused by laying refractory bricks and also raise the operating surface. In addition, to provide an electric furnace hearth structure that can reduce the time required for disassembling and repairing, and reduce the time required for furnace construction. [Structure] A large brick with an area of the working surface of 0.1 to 1.0 m ² is laid on the outer circumference of the tuyere brick through a large joint, and further, a large joint is formed on the outer circumference of the large brick. By laying down a brick via the bottom, a brick is used on the bottom of the furnace, and by enlarging it, the furnace construction work can be simplified and the time can be shortened. The heavy muscle work can be reduced and reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bottom structure of an electric furnace having a tuyere for blowing gas at the bottom.

[0002]

[Prior art]

 In recent years, a method of blowing gas from a tuyere brick provided on the bottom of a furnace for refining molten metal in an electric furnace has been generalized. However, most of the bottom of this electric furnace was constructed by stamping material, so the agitation of the molten steel by the blown gas increases the wear of the bottom refractory, shortening the life of the furnace, the frequency of furnace repairs, and the furnace material. Has led to an increase in the use of

Therefore, in Japanese Utility Model Publication No. 2-47436, the structure of the gas blowing portion at the bottom of the conventional electric furnace is such that the outer circumference of the tuyere brick is provided with a receiving brick, and the outer circumference serves as a stamping material. In this case, a refractory brick was installed between the receiving brick and the stamp material, and the part composed of the stamp material was moved away from the tuyere that is easily damaged by gas blowing, and Is disclosed.

However, if the laying range of the refractory brick is narrow, the effect of preventing damage due to gas blowing is small, and if it is too wide, there is a problem that the operating surface is lifted by the expansion of the brick due to heat and the effect of the brick laying is lost.

On the other hand, in recent years, in order to improve the operation efficiency of the electric furnace, it has become common practice to perform furnace repair in a state where the inside of the furnace is not sufficiently cooled, It has become desirable to reduce the heavy-duty work of construction and repair work of electric furnaces with structures at high temperatures.

From this point of view, as in the case of the above-mentioned tuyere structure, bricking only around the tuyere or construction with small-sized bricks and stamp material is more workable than construction with only stamp material. The work conditions under dust and high temperature at the time of dismantling are inferior as in the case of the stamp material alone.

[0007]

[Problems to be solved by the device]

 The problem to be solved by the present invention is to operate at the bottom structure of an electric furnace having at least one tuyere and mainly composed of bricks, while being able to sufficiently exert the damage prevention effect associated with the laying of refractory bricks. The purpose is to provide a means that can achieve the reduction of heavy muscle work at the time of dismantling and repair, and the shortening of furnace construction work time without causing the surface to rise.

[0008]

[Means for Solving the Problems]

 In the present invention, as the hearth structure of such an electric furnace, a large brick is laid on the outer circumference of the tuyere receiving brick through a large joint, and further, a large brick is held on the outer circumference of the large brick. Is laid.

As the large-sized brick, one having an area on the working surface side of about 0.1 to 1.0 m ² is preferable. This is because if it is too small, it will be easy to handle, but it will take time and labor for the laying work, and if it is too large, it will not be possible to move it with a simple heavy machine.

[0010]

[Action]

 By laying bricks on the bottom of the furnace, wear is reduced, and by increasing the size, fine laying work is eliminated, and even when it is dismantled like a stamp material, it does not break into small pieces, it has a good breaking efficiency, and dust Is hard to stand.

Further, the large joint between the tuyere receiving brick and the laying brick laid on the outer periphery thereof facilitates the installation of the tuyere brick and absorbs the expansion of the lining brick. Filling mortar for adhesion between each brick prevents bricks from floating and prevents ingot insertion.

When a large joint is provided on the outer periphery of the brick, the expansion of the brick to the outside is suppressed and the force stopped by the brick is absorbed.

These large joints are preferably about 50 to 100 mm. If they are too narrow, they cannot absorb the expansion, and if they are too wide, they will melt from the joints. The material used for the joint is a general MgO or MgO-C type casting material, press-fitting material, vibration casting material, or the like.

[0014] The pressed bricks arranged outside the flooring bricks prevent the bricks from expanding outward. Depending on the construction condition, the upper part may be a bank part covered with vibration casting material, or the brick It will be under the stacked operating furnace walls and can be used for a long period of time, while preventing the lifting of the bricks themselves.

[0015]

【Example】

 Each attached drawing shows an embodiment of the present invention.

Embodiment 1 FIG. 1 shows a cross-sectional structure of a first embodiment having one tuyere, and FIG. 2 shows a cross-sectional view taken along the line II of FIG.

In these figures, a furnace bottom A is composed of a brick 1, a vibration casting 2, a permanent brick 3, and a steel shell 4 from the inside in the thickness direction. The inner working surface of the hearth bottom A has a tuyere portion 5 at a substantially central portion surrounded by the brick 1, and the tuyere portion 5 has a tuyere brick 6 and an upper tuyere receiving brick 7 supporting the tuyere brick 6. In addition, a large joint 8 is provided between the tuyere brick 7 and the bedding 1, which absorbs the expansive force applied to the bedding 1 and the tuyere 5 to facilitate the installation of the tuyere brick 6. .. Further, the tuyere portion 5 has a lower tuyere receiving brick 9 which is divided into a plurality of pieces from the upper tuyere receiving brick 7 toward the steel skin 4 side, and the tuyere brick 6 is provided to facilitate replacement of the tuyere brick 6. Are fitted with a gap, and the vibration casting material 2 is filled in the gap.

The bricks 1 are joined by joints 10 made of an adhesive mortar that prevent the metal bricks from being lifted up from each other and the metal insertion. Further, a large joint 8 and a holding brick 11 are provided on the outer side of the laid brick 1 to absorb and disperse the expansive force and prevent the brick 1 of the entire furnace bottom A from floating. From the upper part of the holding brick 11 to the inside of the furnace side wall B, the lining brick 12 is used, and the surface is covered with the vibration casting material to form the bank portion 13. As a result, the life of the pressed brick 11 is extended, and it becomes a weight and the usage effect is improved. In addition, 14 is a tap hole and 15 is a gutter block, and the part from the gutter block 15 to the brick can also be laid in blocks.

Embodiment 2 FIG. 3 shows a plan view of an embodiment having two tuyere.

FIG. 3 shows an embodiment in which two tuyere portions 5 are provided, and the basic structure is the same as in the case of FIG. 1 showing the first embodiment, but the brick 1 is pressed in the longitudinal direction. The large joint 8 which is in contact with 11 is thick, and the large joint 8 which is in contact with the holding brick 11 in the direction in which the tuyere portions 5 are arranged has a slightly thin joint.

[0021]

[Effect of the device]

 The present invention has the following effects.

(1) By using a brick at the bottom of the furnace and enlarging it, the furnace construction work can be simplified and the time can be shortened, the dust generation at the time of dismantling can be reduced, and the heavy reinforcement work at high temperature can be performed. Can be achieved.

(2) It prevents the bottom of the furnace from rising and rising due to the expansion of the brick that occurs when the brick is used with large joints, and prevents large bricks from being ingots caused by cracks in the vibration casting material. It can be prevented and the life of the furnace is greatly extended.

[Brief description of drawings]

FIG. 1 shows a cross-sectional structure of a first embodiment of the present invention having one tuyere.

FIG. 2 shows a cross-sectional view taken along the line II of FIG.

FIG. 3 is a plan view of a second embodiment of the present invention having two tuyere.

[Explanation of symbols]

A Furnace bottom B Furnace side wall 1 Floor brick 2 Vibration casting material 3 Permanent brick 4 Iron skin 5 Tuyere part 6 Tuyere brick 7 Top tuyere brick 8 Large joint 9 Bottom tuyere brick 10 Joint 11 Inside brick 12 Tension brick 13 Embankment 14 Steel tap 15 Gutter block

Front page continued (72) Inventor Kazuo Sasaki 1-1 Higashihama-cho, Hachimansai-ku, Kitakyushu, Fukuoka Kurosaki Ceramics Co., Ltd. (72) Inventor Hiroshi Yamada 3-12 Shirahama-cho, Ashiya-cho, Onga-gun, Fukuoka (72) Inventor Yutaka Mimine 11-4 Suedakao housing complex around Mizumaki Town, Onga District, Fukuoka Prefecture

Claims (1)

[Scope of utility model registration request] 1. In a hearth structure of an electric furnace having at least one tuyere and mainly composed of a brick, a large brick is laid on the outer periphery of a tuyere receiving brick via a large joint, In addition, the brick floor structure of the electric furnace, in which a holding brick is laid on the outer periphery of this large-sized brick via a large joint.