JP4495330B2 - Cooling panel for blast furnace wall - Google Patents

Description

[0001]
BACKGROUND 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]
[Prior art]
In blast furnace operation, a stave cooler is used to cool the iron skin from high temperature reactions in the furnace. In recent years, as the amount of pulverized coal blown from the tuyere's tuyere increased, the heat load on the blast furnace wall increased and fluctuated, and instead of the conventional cast iron stave cooler, a copper stave cooler became part of it. It has begun to be adopted.
[0003]
FIG. 5 is an enlarged view of the lower portion of a stave of a conventional copper stave cooler. A metal stave body 21 is arranged inside the iron skin 12, and cooling water is supplied to a cooling water passage 22 provided in the stave body 21. 12 is cooled. FIG. 5 shows only the lower part of the stave body 21, but the upper part is almost the same as the lower part, and the cooling water flows from the lower cooling water pipe 26 through the water supply port 23 and passes through the upper drainage port. To flow out of the cooling water pipe.
[0004]
As a structure of a conventional copper stave cooler, for example, in Japanese Patent Publication No. 63-56283, a water channel is drilled in a stave body made of forged or rolled copper or copper alloy, and both ends of the water channel are welded by plugs. A structure in which the cooling water pipe is welded to the stave body is described.
[0005]
Japanese Patent Application Laid-Open No. 11-293312 discloses a water channel formed by casting a stave body made of copper or a copper alloy, forming a water channel with a core at the time of casting, and destroying and removing the core from a plurality of openings after solidification. A structure in which a cooling water pipe is welded to the stave body is described.
[0006]
[Problems to be solved by the invention]
In such a conventional copper stave structure,
(1) The weight of the copper base material is heavy and the cost is high.
[0007]
(2) Sophisticated deep hole drilling technology, casting technology and plug welding technology and strict inspection are required.
[0008]
(3) The water channel is formed by the base material of the stave body and is excellent in heat transfer. However, if a crack develops due to a material defect or a fine crack that occurs during use, the water channel seal is immediately lost. , Causing water leakage into the furnace.
[0009]
(4) When the sealed water channel is formed, welding of the plug 24 cannot be avoided as shown in FIG. 5, and there remains anxiety about reliability under severe conditions for a long period of time.
[0010]
(5) Since the cooling water pipe 26 is welded to the stave body 21 at an angle close to a right angle as in the example of FIG. 5, the flow direction of the cooling water changes abruptly. There is a concern of causing water retention.
[0011]
(6) As in the example of FIG. 5, the cooling water pipe 26 is joined by laminar fillet welding with the end of the pipe 26 inserted into the water supply / drain outlet 23 and a groove at the outer edge of the water supply / drain outlet of the stave body 21. Therefore, the welding strength against bending and tension is not always sufficient. For this reason, when the location where the cooling water pipe 26 of the stave body penetrates through the iron shell 12 is hermetically joined, the expansion pipe 25 is used, and a space for that is required outside the iron furnace. was there.
[0012]
Accordingly, the problem to be solved by the present invention is to provide a blast furnace furnace wall cooling panel that is lighter, cheaper and easier to manufacture in place of a stave cooler in a furnace wall cooling apparatus used for cooling blast furnace furnace walls and the like. is there. Also, there are no welding points on the refrigerant path, the risk of water leakage is extremely low, the cooling water pressure loss is low, there is no stagnation, the expansion and contraction pipes can be omitted, and the length of the piping through which the refrigerant passes can be shortened A cooling panel is provided.
[0013]
[Means for Solving the Problems]
The blast furnace wall cooling panel of the present invention, in the furnace wall cooling panel provided around the inner surface of the blast furnace furnace wall, is configured with slopes so that the outer edges of the plates of the blast furnace wall cooling panel adjacent in the vertical and horizontal directions overlap each other, The vertical and horizontal ribs are configured in a grid pattern on the front of the blast furnace wall cooling panel, and the vertical and horizontal ribs are provided in a grid pattern on the back, and a refrigerant pipe made of copper, copper alloy, or steel that passes the refrigerant from the water supply side to the drainage side. One pipe is bent and arranged without providing a welding point inside the furnace, and a refrigerant pipe is fitted into a cut-out portion cut out in accordance with the refrigerant pipe on a copper or copper alloy plate, and a tangent to the plate is welded. A portion where the refrigerant pipe rises from the plate is a double pipe made of a steel pipe having a diameter larger than that of the refrigerant pipe .
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a blast furnace wall cooling panel according to 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 wall cooling panel for a blast furnace according to the present invention, FIG. 2 is a horizontal sectional view showing a state in which the blast furnace wall cooling panel is attached to the furnace wall, and FIG. Sectional drawing which shows the double pipe structure of the part which stands | starts up from a panel, FIG. 4 is sectional drawing which shows another Example of refrigerant | coolant piping.
[0016]
In FIG. 1, in order to fit the refrigerant pipe 2 through which the refrigerant passes through the copper or copper alloy plate 1, a cutout part cut out in accordance with the refrigerant pipe is formed, and the refrigerant pipe 2 is fitted into the cutout part. A furnace wall cooling panel for blast furnace (hereinafter referred to as “cooling panel”) is formed by joining tangents to the plate 1 by known welding such as arc welding, gas welding, brazing, or the like. The refrigerant pipe 2 is made of copper, copper alloy, or steel, and in order to cool the panel area evenly with one or more as few as possible, one or more pipes are arranged vertically or horizontally, or in a bowl shape or meandering Bend into a shape.
[0017]
On the front surface of the cooling panel forming the furnace inner surface, the horizontal ribs 3 and the vertical ribs 4 are arranged in a lattice shape for reinforcement. Further, the horizontal ribs 9 and the vertical ribs 10 are also formed in a lattice shape on the rear surface of the cooling panel. Alternatively, the studs 5 may be arranged as shown in FIG.
[0018]
Further, the outer edge of the cooling panel plate is composed of slopes 6 and overlaps with the slope 6 of the outer edge of the adjacent cooling panel, thereby promoting heat transfer compared to the case where the outer edges are formed vertically. It is possible to prevent the cooling effect from being lowered.
[0019]
At the part where the refrigerant pipe 2 rises from the plate 1 of the cooling panel, a steel pipe 7 having a diameter larger than that of the refrigerant pipe 2 is used as an outer pipe to form a double pipe. The steel pipe 7 is sealed with the steel pipe 7 of the double pipe portion. The member 8 is hermetically sealed.
[0020]
Mounting bolts 11 for fixing the cooling panel to the iron skin 12 are provided at positions avoiding the lattice-shaped ribs 3, 4, 9, 10 or the stud 5 and the refrigerant pipe 2. After the cooling panel is attached to the iron skin 12 with bolts, the castable 13 is poured into the gap with the iron skin 12.
[0021]
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, so as to have a buffering effect against a high heat load at the beginning of firing. The sprayable castable 14 falls off after a while, but immediately the molten material in the furnace adheres and covers the front surface. It is desirable that the lattice-shaped ribs 3 and 4 or the studs 5 on the front surface of the cooling panel are arranged in order to stably hold the deposit layer.
[0022]
In FIG. 4, the refrigerant | coolant piping 2 is pressed after a bending process, and the case where the cross-sectional shape of the refrigerant | coolant piping 2 is made into an ellipse is shown. By making the cross-sectional shape of the refrigerant pipe 2 elliptical or oval, the ratio of the pipe area to the panel area can be increased, and the cooling effect can be enhanced. In FIG. 4, the castable 13 and the cooling panel are firmly coupled by arranging the stud 5 on the front surface of the cooling panel.
[0023]
【The invention's effect】
The following excellent effects can be obtained by the furnace wall cooling panel for a blast furnace according to the present invention.
[0024]
(1) It is composed of a copper or copper alloy plate and a refrigerant pipe made of copper, copper alloy or steel, and can be manufactured at a very light weight and at a low cost.
[0025]
(2) Refrigerant piping can be constructed by bending one pipe material from the water supply side to the drainage side without providing a welding point inside the furnace, so that it can sufficiently withstand long-term use. .
[0026]
(3) Since the refrigerant pipe can be bent without a sudden change in the cross-sectional shape by selecting an appropriate bending radius, there is no increase in cooling water pressure loss and no stagnant portion.
[0027]
(4) Even when a cooling panel is installed in the vicinity of the opening for the sonde or the tap hole, it can be designed and manufactured in an arbitrary shape. In addition, when the cooling panel is installed by diverting the iron skin of the cooling panel, it can be designed and manufactured according to the existing opening shape.
[0028]
(5) By making the cross-sectional shape of a pipe into an ellipse or an oval, the ratio of the area of the pipe part to the cooling panel area can be increased, and the cooling effect can be enhanced.
[0029]
(6) The vertical and horizontal ribs are arranged in a lattice pattern on the front of the cooling panel, or studs are placed, and castable is blown before the blast furnace is operated to provide a buffering effect against the high heat load at the beginning of firing. It is possible to easily adhere and hold the molten material.
[0030]
(7) Since the outer edge of the cooling panel plate is composed of slopes, and the outer edge slopes of the cooling panel plates adjacent to the top, bottom, left, and right can be placed around each other, the cooling effect at the joints of the cooling panel is reduced. Can be prevented.
[0031]
(8) Reinforcement effect is enhanced by using a steel pipe with a diameter larger than that of the refrigerant pipe as the outer pipe at the part where the refrigerant pipe rises from the plate part of the cooling panel. There is no need to use a telescopic tube. Therefore, the length of the cooling water piping outside the iron skin can be shortened, and the space can be reduced.
[0032]
(9) Vertical and horizontal ribs can also be formed in a lattice shape on the back side 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 in which the blast furnace wall cooling panel of the present invention is attached to the furnace wall.
FIG. 3 is a cross-sectional view showing a double pipe structure of a portion where the refrigerant pipe of the present invention rises from a blast furnace wall cooling panel.
FIG. 4 is a cross-sectional view showing another embodiment of the refrigerant pipe of the present invention.
FIG. 5 is an enlarged view of a lower portion of a stave of a conventional copper stave cooler.
[Explanation of symbols]
1: Plate, 2: Refrigerant piping, 3: Horizontal rib, 4: Vertical rib, 5: Stud, 6: Slope of outer edge, 7: Outer pipe of double pipe, 8: Seal member, 9: Back lateral rib, 10 : Back longitudinal rib, 11: Mounting bolt, 12: Iron skin, 13: Back castable, 14: Front castable, 21: Stave body, 22: Cooling channel, 23: Water supply port (drainage port), 24: Plug welding Part, 25: telescopic pipe, 26: cooling water piping

Claims (1)

In the furnace wall cooling panel provided around the inner surface of the blast furnace furnace wall,
The outer edges of the blast furnace wall cooling panel adjacent to the top, bottom, left and right are composed of slopes so as to overlap each other,
The vertical and horizontal ribs are configured in a grid pattern on the front of the blast furnace wall cooling panel, and the vertical and horizontal ribs are provided in a grid pattern on the back.
Place a refrigerant pipe made of copper, copper alloy or steel through which the refrigerant passes without bending a single pipe from the water supply side to the drainage side and providing a welding point inside the furnace ,
Fit the refrigerant pipe into the cut-out part cut out according to the refrigerant pipe on the copper or copper alloy plate, weld the tangent to the plate,
A blast furnace furnace wall cooling panel characterized in that a portion of a refrigerant pipe rising from a plate is a double pipe made of a steel pipe having a diameter larger than that of the refrigerant pipe .

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