JP3033889B2 - Construction method of blast furnace bottom plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of installing a bottom plate of a blast furnace furnace for shortening the period of on-site construction work, which is a critical step in the construction and repair work of a blast furnace, so as to shorten the construction repair work. In detail, when constructing the hearth of the blast furnace, after moving the hearth bottom plate previously manufactured in another place onto the blast furnace foundation, the horizontal level of the carbon stamp is effectively adjusted, It is intended to shorten the period.

[0002]

2. Description of the Related Art A conventional blast furnace bottom construction method is to weld and fix a divided bottom plate to an H-beam fixed on a blast furnace foundation, install a stamp guide plate on the upper surface thereof, After fixing the side of the bottom plate to the furnace bottom side wall by welding and flaw detection of the welded part, the bottom plate is previously provided with a press-fit tube for press-fitting carbon paste into the space below the bottom plate. When the construction was completed, the carbon paste was constructed, and the carbon stamp was constructed while adjusting the horizontal level of the upper surface of the carbon stamp.

[0003] Carbon bricks and the like are stacked on a carbon stamp to form a furnace bottom brick structure. The furnace bottom brick structure has a role of a container for holding hot metal during operation of the blast furnace. If a structural defect occurs in the hearth brick, the hot metal flows to the back of the brick to float the brick, or when the hot metal comes into contact with the steel shell, bottom plate, etc., the steel shell and the bottom plate are melted and the hot metal flows out of the furnace. It could lead to an accident. Therefore, it is common practice to temporarily assemble hearth bricks before construction on site and to include processes such as checking the overall dimensions and joint dimensions between the bricks. Therefore, it is necessary to perform the levelness of the carbon stamp level as accurately as possible, even when constructing the hearth brick structure on site.

[0004] Japanese Patent Publication No. 47-1846 discloses a blast furnace with a hearth, an upper hearth and a bosh, a belly and a hearth, an upper hearth,
The furnace opening and the like are divided into several parts as appropriate, and each part is individually configured on each scaffold pre-built at approximately the same height as the completed assembly of each part around the installation of the blast furnace. It is disclosed that the entire stack is combined and integrally formed by sequentially moving the stack in the horizontal direction using a moving scaffold.

Japanese Patent Application Laid-Open No. 52-43709 discloses that several building blocks of a blast furnace furnace body are in a state of completion of brick lining, painting, electric instrumentation, piping, etc. at a building site separated from the blast furnace foundation. After completion, the furnace body constituent blocks are sequentially transferred from the building site to the foundation by the carrier vehicle itself constituting the furnace bottom platen, and the blocks from the top to the bottom of the furnace body are sequentially lifted up on the foundation, Finally, it is described that the furnace bottom and the bottom plate are completed by simultaneously fixing the furnace bottom block and the frame of the bogie on the foundation.

[0006]

In these techniques, the hearth is manufactured at a place other than the foundation, and is moved laterally to be installed on the hearth foundation. Absent. SUMMARY OF THE INVENTION The present invention aims to provide specific means, and shows a specific solution for level adjustment on a basis.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a furnace bottom plate to be installed in refurbishment of a blast furnace is preliminarily manufactured at a position other than the furnace bottom foundation, and a carbon stamped one is moved to the blast furnace foundation for installation. In doing so, a number of circular openings are provided in the furnace bottom plate, one end of a pipe having internal threads on the inner surface is vertically fixed to the circular opening, and a carbon paste press-fitting pipe having external threads screwed with the internal threads of the pipe is formed in the pipe. After bonding and moving the bottom plate onto the blast furnace bottom foundation, the carbon paste press-fitting pipe is moved up and down in the vertical direction to adjust the horizontal level of the bottom plate.

In the present invention, the bottom plate of the furnace bottom is previously assembled on a leveled surface plate at a position different from the base of the blast furnace.
Attach the carbon stamp guide plate, set the level, and hit the carbon stamp along the guide plate. Take the integrated bottom plate into the site. The level of the upper surface of the carbon stamp is obtained by moving a number of carbon paste press-fitting tubes attached to the bottom plate of the furnace bottom up and down. After leveling, the inside of the press-fit tube is partially weld-stopped. After press-fitting the carbon paste, the protrusions are cut off. According to the furnace bottom plate on-site installation process described above, the process can be shortened.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 shows a vertical sectional view of the blast furnace 10.
FIG. 1 is an enlarged view of the portion A, and FIG. 2 is a partially enlarged view of the portion B of FIG. On the bottom of the blast furnace 10, a cooling pipe 5 is arranged on a foundation, and inside a steel shell 4, a carbon stamp 1 is applied on a furnace bottom plate 3.

In FIG. 1, a carbon stamp 1 is laid on a hearth bottom plate 3, and the hearth bottom plate 3 maintains the airtightness in the furnace of the blast furnace, and is stacked thereon by leveling the carbon stamp. The furnace bottom brick 8 is the basis. Fast installation of the bottom plate is one of the important factors in the short-term renovation of the blast furnace. A number of carbon paste press-fitting pipes 2
Is installed. The carbon paste press-fitting pipe 2 is screwed into a pipe fixed vertically to the circular opening in the bottom plate of the furnace bottom, and moves forward and backward in the vertical direction by rotating. , The level is accurately set.

The procedure for installing the bottom plate is as follows.
First, the furnace bottom plate 3 is manufactured in advance at a position different from the blast furnace bottom. A carbon stamp guide plate 6 is attached to the blast furnace bottom plate 3 to prevent deflection, thereby improving the strength of the bottom plate. The carbon stamp 1 is installed. At this time, the carbon paste press-fitting pipe 2 is attached as a leveling jig, and the carbon paste press-fitting pipe is adjusted so that leveling can be performed. The bottom plate preserves the confidentiality of the inside of the furnace and is the basis for the bottom bricks piled on it by leveling the carbon stamp. Next, the integrally formed blast furnace bottom plate 3 is moved and installed on the blast furnace base as an integrated bottom plate. Next, the multiple carbon paste press-fitting pipes 2 are adjusted to level the carbon stamp on the furnace bottom plate. Then, carbon paste 7
Press-fit.

As described above, accurate horizontal leveling can be performed, and the period of the blast furnace repair site construction can be shortened.

[0013]

According to the present invention, it took about 20 days to install the bottom plate of the furnace, but according to the present invention, the furnace bottom is assembled at a different position from the base of the blast furnace and moved to the base. Furnace bottom installation can be completed in two days.

[Brief description of the drawings]

FIG. 1 is a partial vertical sectional view of a blast furnace (part A in FIG. 3) showing a blast furnace bottom structure of an embodiment.

FIG. 2 is a partially enlarged view of a portion B in FIG. 1;

FIG. 3 is a longitudinal sectional view of a blast furnace.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Carbon stamp 2 Carbon paste press-fitting pipe 3 Furnace bottom bottom plate 4 Iron shell 5 Furnace bottom cooling pipe 6 Carbon stamp guide plate 7 Carbon paste 8 Furnace bottom brick 9 Foundation 10 Blast furnace

Continuation of the front page (72) Inventor Masao Fujita 1 Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture Kawasaki Steel Corp. Chiba Works (58) Field surveyed (Int. Cl. ⁷ , DB name) C21B 7/00 303 C21B 7/00 304 E04G 21/14 F23M 5/00

Claims (1)

(57) [Claims] 1. A furnace bottom plate to be installed in refurbishment of a blast furnace is manufactured in advance at a position other than the furnace bottom foundation, and a carbon stamped one is moved to and installed on the blast furnace foundation. A plurality of circular openings are provided, one end of a pipe having an internal thread on the inner surface is vertically fixed to the circular opening, and a carbon paste press-fitting pipe having an external thread to be screwed with the internal thread of the pipe is connected to the pipe. A method of constructing a blast furnace bottom plate, comprising: moving the furnace bottom plate on a foundation; moving a carbon paste press-fitting pipe back and forth in the vertical direction to adjust the horizontal level of the furnace bottom plate.