JP2002030310A - Structure of furnace wall in blast furnace and method for constructing furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extend the service life of a furnace wall in a blast furnace by improving a furnace wall cooling performance, and also to shorten the period required for constructing the furnace wall. SOLUTION: This furnace wall is formed as integral structure of a stave cooler and bricks through a monolithic refractory layer having high heat- conductivity. Several steps of ribs are projectingly arranged at the brick side of the stave cooler and the ribs are inserted into grooves arranged in the brick, and press-in holes for pressing the monolithic refractory into this stave cooler are arranged. Further, the furnace lining is performed by which several steps of the ribs projectingly arranged in the stave cooler are inserted into the grooves in the brick and after fixing the block formed by pre-fixing with brick fixing bolts to a prescribed position, the brick fixing bolts are taken off, and the monolithic refractory is pressed in the bolt hole opened as the press-in hole, and successively, the stave cooler is fixed to an iron shell by inserting a fitting bolt for the iron shell into the bolt hole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a furnace wall structure and a furnace construction method capable of extending the life of a blast furnace by shortening the furnace wall construction time by increasing the cooling effect of the blast furnace bottom, and shortening the construction period of the furnace wall.

[0002]

2. Description of the Related Art In recent years, a stave cooling method has been frequently used as a method of cooling a furnace wall of a blast furnace. Is installed from the bottom of the furnace wall, etc., and the building is sequentially advanced to the upper stage.

[0003] At that time, in the construction of the furnace wall brick of each step, a gap of about 100 mm is provided between the inner surface of the stave and the brick, and after the installation of each step of the furnace wall brick is completed,
A stamp material, which is an irregular shaped material, is poured into this gap with a hammer to secure the allowance for brick expansion and to transfer the heat from the furnace wall brick exposed to a high temperature of 1500 ° C to the stave to cool the furnace wall brick and wear it out. To prevent furnace wall life.

In addition, since the furnace wall at the bottom of the furnace is in direct contact with the hot metal, the joint between the bricks at the time of construction should be 0.5 mm or less in thickness, and high quality installation accuracy is required for the purpose of preventing the hot metal from entering the joint. Have been. As a method of shortening the construction period of the furnace wall, Japanese Patent Application Laid-Open No. S59-158983 proposes a method of installing a steel shell, a cooling device, and a brick as an integrated installation block.

[0005]

In the blast furnace, the life is determined by the wear rate of the furnace wall brick at the bottom of the furnace. However, in the conventional furnace wall structure, the cooling performance cannot be improved, and the life is 15 years.
Years are the limit. Furnace wall bricks wear due to repeated cracking and peeling due to high temperature,
To extend the life, it is essential to improve the cooling performance of the furnace wall.

Japanese Patent Application Laid-Open No. 59-158983 proposes a method for shortening the construction period of a furnace wall. However, since the installation block is installed on the basis of a steel shell, it is possible to secure a joint width with high precision especially at the furnace bottom. Since it is difficult and there is no structure that absorbs the thermal expansion of the brick, cracks are generated in the brick due to thermal stress inside the brick, wear easily proceeds, and it is difficult to maintain a long life. The problem to be solved by the present invention is to extend the life of the blast furnace by improving the furnace wall cooling performance and shorten the construction period of the furnace wall.

[0007]

According to the structure of the present invention for solving the above-mentioned problems, the stave and the brick are integrated with each other via a layer of irregularly shaped refractory material having a high thermal conductivity. A plurality of ribs are protruded on the side, the ribs are inserted into grooves provided in the brick, and a stave is provided with a press-fit hole for press-fitting the irregular-shaped refractory material. It is a furnace wall structure of a blast furnace.

According to a method of the present invention for solving the above-mentioned problems, in a method of dividing a furnace wall into transportable installation blocks and sequentially constructing from the bottom, a plurality of ribs protruding from a stave are formed on a brick. After inserting into the groove and fixing the installation block formed in advance with the brick fixing bolts in place, the brick fixing bolts are removed, and the irregular refractory material is pressed in using the bolt holes of the opened staves as press-in holes. Then, an iron shell mounting bolt is inserted into the bolt hole to fix the stave to the iron shell.

[0009]

1 and 2 show an example in which a furnace wall of a blast furnace is constructed by the furnace wall structure of the present invention. FIG. 1 is a horizontal sectional view showing a plane of a furnace bottom, and FIG. 2 is a vertical sectional view. As shown in FIG. 1, a steel shell 2 is provided around a furnace bottom 1 and a furnace wall using the furnace wall structure of the present invention is built inside the steel shell 2. The furnace bottom 1 is constructed by laying a brick 9 on a bottom plate 10 as shown in FIG. 2 and laying a vertical brick 8 on the brick.

The furnace wall structure of the present invention comprises a stave 3 and a brick 5
And an irregular shaped refractory material interposed therebetween. FIG.
The stave 3 has several ribs (three in this example)
The rib 4 is inserted into the groove of the brick 5, and the stave 3 and the brick 5 have an integral structure via a layer of the stamp material 11 which is an irregular refractory material having high thermal conductivity.

The stave 3 is provided with a press-in hole 15 as shown in FIGS. The press-in hole 15 is used for press-fitting an irregular-shaped refractory material such as the stamp material 11 into the inside of the furnace. In the present embodiment, the press-in hole 15 also serves as a hole for the brick fixing bolt 16 and the steel shell fixing bolt 17.

In the example shown in FIG. 1, the furnace wall is composed of sixteen installation blocks 6, and each installation block 6 integrates three bricks 5 with one stave 3. Reference numeral 7 denotes an adjustment brick for adjusting the interval between the installation blocks 6. Stave 3
Varies depending on the furnace volume, but 20 to 30 in the circumferential direction,
Three to four stages are used in the furnace height direction. Each installation block 6
Assemble at the factory in advance and bring it to the furnace place to build the furnace.

The ribs 4 projecting from the stave 3 provide a cooling fin effect and a brick holding effect. The rib 4
Several stages can be provided according to the size of the stave 3 and the required cooling performance. A stamp material 11 as a highly thermally conductive irregular-shaped material having plasticity is provided on the entire surface of the rib 4 of the stave 3, and a brick 5 provided with a groove into which the rib 4 is inserted is attached to the stave 3, and FIG. 3 and FIG. It is fixed to the stave 3 by a brick fixing bolt 16 as shown. Stamp material 11
The thickness can be set to about several tens mm depending on the amount of thermal expansion of the brick 5 so that the thermal expansion allowance of the brick 5 is secured.

Next, according to the method of the present invention, as shown in FIGS. 1 and 2, in a method of dividing the furnace wall into transportable installation blocks 6 and sequentially constructing them from the bottom, It is constructed as in the example shown in FIGS. After constructing the laying brick 9 on the bottom plate 10 as shown in FIG.
After temporarily placing each of the mounting blocks 6 at the predetermined positions on the bricks 9 and laying down the vertical bricks 8, the stave 3 is fixed to the steel shell 2, and each of the mounting blocks 6 is fastened to the vertical bricks 8. Adhere. A castable 12 is interposed between the stave 3 and the steel shell 2.

As the contacting means, for example, a means can be employed in which a jack bolt is attached to the bolt hole after removing the brick fixing bolts 16 and tightened, and the bricks 5 are pressed into the furnace and adhered. Next, each of the second-stage installation blocks 6 is placed at a predetermined position based on the upper surface of each of the first-stage installation blocks 6, and a furnace wall is constructed by the method of the present invention.
Similarly, construction of the third and higher stages is performed.

The details of the method of fixing the brick 5 and the stave 3 and the method of fixing the stave 3 and the steel shell 2 are shown in FIGS. At a factory or the like other than the furnace construction site, the installation block 6 is assembled with the brick 5 and the stave 3 in advance. A screw hole is provided in the brick 5, and a brick fixing bolt 16 is inserted into at least two of the bolt holes formed in the stave 3 as shown in FIG. 3, and the brick 5 is fixed to the stave 3 to assemble the installation block 6. At this time, a stamp material 11 which is an irregular refractory material having a high thermal conductivity is interposed between the stave 3 and the brick 5.

The assembled installation block 6 is carried into a furnace place, and the first-stage installation block 6 is first temporarily placed at the predetermined position. The positioning of the temporary placement can be performed by inserting the head of the brick fixing bolt 16 into a mounting hole 18 previously provided in the steel shell 2 as shown in FIG.

When the arrangement of the first-stage installation blocks 6 is completed, the intervals between them are adjusted, and as shown in FIG. 3, some bolt holes of the stave 3 are used for the iron-bar fixing bolts 17, and FIG. Thus, the installation block 6 is fixed to the steel shell 2 by inserting the steel mounting bolt 17 from the outside of the steel shell 2 into the steel mounting hole 18. Then, as shown in FIG. 4, the brick fixing bolt 16 to which the stave 3 and the brick 5 are fixed is removed from another steel shell mounting hole 18. After that, the installation block 6 is tightened and adhered to the vertical brick 8 as described above.

Next, a second-stage installation block 6 is constructed. For the second stage, when it is located on the vertical brick 8 as in the example of FIG.
In order to position each of the second-stage installation blocks 6 at a predetermined position on the upper surface of each of the first-stage installation blocks 6, as in the case of the first-stage, as shown in FIG. Hole 18
By inserting the head of the brick fixing bolt 16 into the hole. Thereafter, similarly to the case of the first stage, the interval between the mounting blocks 6 is adjusted, and as shown in FIG.
After fixing the installation block 6 to the steel shell 2 by using 7, the brick fixing bolt 16 is removed. The third and subsequent steps are performed in the same manner as the second step.

After that, for each stage of the installation block 6,
The bolt hole after removing the brick fixing bolt 16 is inserted into the press-fit hole 15.
As shown in FIG. 5, a stamp material 11 which is an irregular-shaped refractory material is press-fitted to fill a gap between the stave 3 and the brick 5. Then, as shown in FIG. 6, the steel shell fixing bolts 17 are attached, and the steel shell 2 and the staves 3 are fixed to complete the construction of each block. After burning the blast furnace, when the brick 5 expands,
By removing the iron fixing bolts 17 and press-fitting the irregularly shaped material having high thermal conductivity from outside the furnace, it is possible to prevent a gap in the layer of the stamp material 11 from hindering the heat conduction from the brick 5 to the stave 3. be able to.

[0021]

According to the present invention, the life of the blast furnace can be extended by improving the cooling performance of the furnace bottom which affects the life of the blast furnace and preventing cracks due to thermal expansion of the brick. By adopting the installation block in which the wall brick and the stave are integrated in advance, the construction period of the furnace wall can be shortened.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a furnace bottom according to the present invention.

FIG. 2 is a longitudinal sectional view showing an example of a furnace bottom according to the present invention.

FIG. 3 is a plan view showing an example of a mounting block according to the present invention.

FIG. 4 is a sectional view of a furnace wall showing an example of a furnace building process according to the present invention.

FIG. 5 is another sectional view of a furnace wall showing an example of a furnace building process according to the present invention.

FIG. 6 is another sectional view of a furnace wall showing an example of a furnace building process according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Furnace bottom 2 ... Iron shell 3 ... Stave 4 ... Rib 5 ... Brick 6 ... Installation block 7 ... Bricks for adjustment 8 ... Vertical brick 9 ... Brick brick 10 ... Bottom plate 11 ... Stamp material 12 ... Castable 13 ... Water pipe 14 ... Water pipe 15 ... Press-in hole 16 ... Brick fixing bolt 17 ... Steel fixing bolt 18 ... Steel mounting hole 19 ... Nut

Claims (2)

[Claims] 1. A stave and a brick have an integral structure with a layer of irregularly shaped refractory material having a high thermal conductivity, and a plurality of ribs are protrudingly provided on the brick side of the stave. A furnace wall structure for a blast furnace, wherein the furnace wall structure is inserted into the provided groove, and the stave is provided with a press-fitting hole for press-fitting the irregular-shaped refractory material. 2. A method in which a furnace wall is divided into transportable installation blocks and sequentially constructed from the bottom, a plurality of ribs protruding from a stave are inserted into a groove of a brick and fixed in advance with a brick fixing bolt. After fixing the installation block formed in a predetermined position, the brick fixing bolt is removed, a non-standard refractory material is press-fitted using the bolt hole of the opened stave as a press-fitting hole, and a steel mounting bolt is inserted into the bolt hole. A method for building a blast furnace, comprising inserting and fixing a stave to a steel shell.