JP2002129213A - Cooling panel for furnace wall of blast furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling panel for furnace wall of a blast furnace which is easily manufactured at lighter weight and lower cost in comparison with a stave cooler and unnecessary to weld on a coolant path extremely low danger to water leakage and low pressure loss of the cooling water, and does not cause the stagnation of water, and can omit and expandable tube and shorten the length of piping passing the coolant, in the cooling device for furnace wall used for cooling the furnace wall, etc., in the blast furnace. SOLUTION: In the cooling panel for furnace wall peripherally arranged on the inner surface of the furnace wall in the blast furnace, the copper or copper alloy-made coolant piping 2 passing the coolant, are disposed, and inserted into cut-off parts cut off so as to match to the coolant piping 2 in a copper or copper alloy-made plate 1 and the jointing lines with the plate, are welded. In the coolant panel, ribs 3, 4 for reinforcing, are arranged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blast furnace furnace wall cooling panel provided around an inner surface of a blast furnace furnace wall.

[0002]

2. Description of the Related Art In the operation of a blast furnace, cooling is performed using a stave cooler to protect the steel shell from high-temperature reactions in the furnace. In recent years, as the amount of pulverized coal injected from the tuyere of the blast furnace has increased, the heat load on the blast furnace furnace wall has increased and fluctuated, and copper stave coolers have replaced some of the conventional cast iron stave coolers. It is starting to be adopted.

FIG. 5 is an enlarged view of a lower part of a stave of a conventional copper stave cooler, in which a metal stave body 21 is disposed inside a steel shell 12 and cooling water is supplied to a cooling water passage 22 provided in the stave body 21. To cool the iron skin 12. FIG. 5 shows only the lower part of the stave body 21, but the upper part is almost symmetrical with the lower part, and the cooling water flows in from the lower cooling water pipe 26 through the water supply port 23 and passes through the upper drainage port. Flows out of the cooling water pipe.

[0004] As a structure of a conventional copper stave cooler, for example, Japanese Patent Publication No. 63-56283 discloses a stove body made of forged or rolled copper or copper alloy, in which a water channel is drilled, and both ends of the water channel are plug-welded. In addition, a structure in which a cooling water pipe is welded to a stave body is described.

[0005] Japanese Patent Application Laid-Open No. H11-29312 discloses a stave body made of cast copper or copper alloy, in which a water channel is formed by a core at the time of casting, and the core is broken and removed from a plurality of openings after solidification. A structure is described in which a water channel is formed by welding, and a cooling water pipe is welded to the stave body.

[0006]

In such a conventional copper stave structure, (1) the weight of the copper base material is heavy and the cost is high.

(2) Strict inspection is required with advanced deep hole drilling technology, casting technology and plug welding technology.

(3) Although the water channel is formed of the base material of the stave body and has excellent heat conductivity, if a crack develops from a material defect or a fine crack generated during use,
Immediately the watertightness of the channel is lost, causing water leakage into the furnace.

(4) As shown in FIG. 5, welding of the plug 24 cannot be avoided at the time of forming a closed water channel, and there remains uncertainty about reliability under severe conditions for a long period of time.

(5) As shown in the example of FIG.
Is welded to the stave body 21 at an angle close to a right angle, so that the flow direction of the cooling water changes abruptly, which may cause an increase in pressure loss and accumulation of the cooling water at the end of the channel.

(6) As shown in the example of FIG.
The end of the pipe 26 is inserted into the water supply / drain port 23, and the groove is welded to the outer edge of the water supply / drain port of the stave body 21 by welding with a fillet, and the welding strength against bending and pulling is not necessarily sufficient. Absent. For this reason, when the cooling water pipe 26 of the stave body is hermetically joined at the place where it penetrates the steel shell 12, it is performed via the telescopic tube 25, and a space is required outside the steel shell furnace. was there.

Therefore, the problem to be solved by the present invention is as follows.
In a furnace wall cooling device used for cooling a blast furnace wall, etc.,
An object of the present invention is to provide a blast furnace wall cooling panel that is lighter, cheaper, and easier to manufacture instead of a stave cooler. In addition, there is no welding point on the refrigerant path, the risk of water leakage is extremely low, the pressure loss of the cooling water is low, there is no stagnation, the expansion and contraction pipe can be omitted, and the length of the pipe through which the refrigerant passes can be shortened. A cooling panel is provided.

[0013]

A furnace wall cooling panel for a blast furnace according to the present invention comprises a furnace wall cooling panel provided around an inner surface of a blast furnace furnace wall, wherein a refrigerant pipe made of copper, copper alloy or steel through which a refrigerant passes is disposed. Then, the refrigerant pipe is fitted into a cutout portion cut out in accordance with the refrigerant pipe on a copper or copper alloy plate, and a tangent to the plate is welded.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the cross-sectional shape of the refrigerant pipe may be made flat to make the cooling surface wider than a circular shape. In addition, grid-like ribs or studs can be provided on the front and / or back of the blast furnace wall cooling panel. Further, the outer edge of the plate of the blast furnace wall cooling panel may be formed by a slope. The portion where the refrigerant pipe rises from the plate may be a double pipe made of a steel pipe having a diameter larger than that of the refrigerant pipe.

Hereinafter, a blast furnace wall cooling panel of the present invention will be described based on an example shown in the drawings. FIG. 1 is a front view showing an example of a blast furnace furnace wall cooling panel of the present invention, FIG. 2 is a horizontal sectional view showing a state where the blast furnace wall cooling panel is attached to a furnace wall, and FIG.
FIG. 4 is a cross-sectional view showing a double pipe structure in which a refrigerant pipe rises from a blast furnace wall cooling panel, and FIG. 4 is a cross-sectional view showing another embodiment of the refrigerant pipe.

In FIG. 1, in order to insert a refrigerant pipe 2 for passing a refrigerant into a copper or copper alloy plate 1, a cut-out portion cut out in accordance with the refrigerant pipe is formed. The tangent line between the pipe 2 and the plate 1 is joined by known welding such as arc welding, gas welding, brazing, etc., so that a furnace wall cooling panel for a blast furnace (hereinafter referred to as “cooling panel”)
That. ) Is formed. The refrigerant pipe 2 is made of copper, copper alloy, or steel, and in order to cool the panel area with one or more pipes as small as possible, one or more pipes may be arranged vertically or horizontally, or may be hooked or meandering. And bend them.

On the front surface of the cooling panel forming the furnace inner surface, horizontal ribs 3 and vertical ribs 4 are arranged in a lattice shape for reinforcement. The horizontal ribs 9 and the vertical ribs 10 are also formed in a lattice shape on the back of the cooling panel. Or, instead of ribs 3 and 4, FIG.
The studs 5 may be arranged as shown in FIG.

Also, the outer edge of the plate of the cooling panel is constituted by the inclined surface 6 so as to overlap with the inclined surface 6 of the outer edge of the adjacent cooling panel, so that the heat transfer can be performed as compared with the case where the outer edge is formed vertically. Can be promoted, and a decrease in the cooling effect can be prevented.

At the portion where the refrigerant pipe 2 rises from the plate 1 of the cooling panel, a steel pipe 7 having a larger diameter than the refrigerant pipe 2 is used as an outer pipe to form a double pipe. 12
And a sealing member 8 for sealing.

At positions other than the grid-shaped ribs 3, 4, 9, 10 or the studs 5 and the refrigerant pipe 2, mounting bolts 11 for fixing the cooling panel to the steel shell 12 are provided. After the cooling panel is attached to the steel shell 12 with bolts, the castables 13 are poured into gaps between the steel shell 12 and the cooling panel.

A castable 14 is sprayed between the grooves or studs 5 formed by the grid-shaped ribs 3 and 4 on the front surface of the cooling panel before the blast furnace is operated to have a buffering effect against a high heat load at the beginning of burning. The sprayed castables 14 fall off after a while, but the molten material in the furnace adheres immediately and covers the front surface. It is desirable that the grid-shaped ribs 3 and 4 or the studs 5 on the front surface of the cooling panel are also arranged in order to stably hold the deposit layer.

FIG. 4 shows a case where the refrigerant pipe 2 is pressed after being bent, and the cross-sectional shape of the refrigerant pipe 2 is made elliptical. By making the cross-sectional shape of the refrigerant pipe 2 elliptical or elliptical, the ratio of the pipe area to the panel area can be increased, and the cooling effect can be enhanced. In FIG. 4, by disposing the stud 5 on the front surface of the cooling panel, the castable 13 and the cooling panel are firmly connected.

[0023]

The furnace wall cooling panel for a blast furnace according to the present invention has the following excellent effects.

(1) It is composed of a copper or copper alloy plate and a refrigerant pipe made of copper, copper alloy or steel.
It can be manufactured at low cost.

(2) The refrigerant pipe extends from the water supply side to the drain side.
Since one tube can be bent and used without providing a weld inside the furnace, it can be used for a long time.
It is enough to withstand.

(3) By selecting an appropriate bending radius, the refrigerant pipe can be bent without an abrupt change in the cross-sectional shape, so that the pressure loss of the cooling water does not increase and a stagnant portion is not formed.

(4) Even when a cooling panel is installed near the sonde opening or taphole opening, the cooling panel can be designed and manufactured in an arbitrary shape. Also, when installing a cooling panel by diverting the steel shell of the cooling board, it can be designed and manufactured according to the existing opening shape.

(5) By making the cross-sectional shape of the tube elliptical or oblong, the ratio of the area of the tube portion to the cooling panel area can be increased, and the cooling effect can be enhanced.

(6) Vertical or horizontal ribs are formed in a lattice shape or studs are arranged on the front surface of the cooling panel, and castables are sprayed before the blast furnace is operated to have a buffering effect against a high heat load at the time of burning, and after the operation, In addition, the molten material in the furnace can be easily adhered and held.

(7) Since the outer edge of the cooling panel plate is constituted by a slope, and the outer edge slopes of the cooling panel plates adjacent vertically and horizontally can be provided so as to overlap each other, the cooling effect at the joint of the cooling panel is obtained. Can be prevented from decreasing.

(8) A steel pipe having a diameter larger than that of the refrigerant pipe is formed as an outer pipe at a portion where the refrigerant pipe rises from the plate portion of the cooling panel to form a double pipe, thereby enhancing the reinforcing effect. Sealing may be simple and there is no need to use telescopic tubes. Therefore, the length of the cooling water pipe outside the steel shell can be reduced, and the space can be reduced.

(9) Vertical and horizontal ribs are also formed in a lattice pattern on the back surface of the cooling panel to enhance the reinforcing effect against thermal deformation.

[Brief description of the drawings]

FIG. 1 shows an example of a furnace wall cooling panel for a blast furnace according to the present invention.

FIG. 2 is a horizontal sectional view showing a state where a blast furnace furnace wall cooling panel of the present invention is attached to a furnace wall.

FIG. 3 is a cross-sectional view showing a double pipe structure of a portion where a refrigerant pipe of the present invention rises from a blast furnace wall cooling panel.

FIG. 4 is a sectional view showing another embodiment of the refrigerant pipe of the present invention.

FIG. 5 is an enlarged view of a lower part of a stave of a conventional copper stave cooler.

[Explanation of Signs] 1: plate, 2: refrigerant pipe, 3: horizontal rib, 4: vertical rib, 5:
Stud, 6: slope of outer edge, 7: outer tube of double pipe, 8: seal member, 9: rear horizontal rib, 10: rear vertical rib, 11:
Mounting bolts, 12: iron skin, 13: rear castable,
14: castable on the front, 21: stave body, 2
2: cooling water channel, 23: water supply port (drain port), 24: plug welded part, 25: telescopic pipe, 26: cooling water pipe

Continued on the front page (72) Inventor Noriaki Ida 46-59 Ohara Nakahara, Tobata-ku, Kitakyushu F-term in Nippon Steel Corporation Engineering Business Unit 4K015 CA03

Claims (6)

[Claims] In a furnace wall cooling panel provided around an inner surface of a blast furnace wall, a refrigerant pipe made of copper, copper alloy or steel through which a refrigerant passes is disposed, and cut out in a copper or copper alloy plate in accordance with the refrigerant pipe. A cooling panel for a blast furnace wall, wherein a refrigerant pipe is fitted into the cutout portion and a tangent to the plate is welded. 2. The cooling panel for a blast furnace wall according to claim 1, wherein a cross-sectional shape of the refrigerant pipe is made flat and a cooling surface is made wider than a circular shape. 3. The blast furnace wall cooling panel according to claim 1, wherein a grid-like rib is provided on a front surface and / or a back surface.
Or the cooling panel for a blast furnace wall according to 2. 4. The blast furnace furnace wall cooling panel according to claim 1, wherein a plurality of studs are arranged inside the furnace of the blast furnace furnace wall cooling panel. 5. The cooling panel for a blast furnace furnace wall according to claim 1, wherein an outer edge of a plate of the blast furnace furnace wall cooling panel is formed by a slope. 6. The blast furnace wall cooling panel according to claim 1, wherein a portion of the refrigerant pipe rising from the plate is a steel pipe having a diameter larger than that of the refrigerant pipe. A cooling panel for the blast furnace wall according to the above.