JP4057773B2 - Block structure of vertical radiant tube type heating chamber furnace body - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a block structure of a furnace body of a radiant tube type heating chamber constituting a continuous annealing furnace facility.
[0002]
[Prior art]
Continuous annealing equipment is used for annealing cold-rolled steel sheets and steel sheets for plating, and vertical radiant tube heating in which multiple radiant tubes for heating the running steel strip are arranged as the heating zone of the continuous annealing equipment A room is installed.
[0003]
Conventionally, as shown in FIGS. 9 and 10, the steel strip continuous annealing furnace has a heating chamber 15 for heating the steel strip 13 to a predetermined temperature, a soaking chamber 16 for holding the heated steel strip 13 at a constant temperature, It comprises a cooling chamber 17 for cooling the soaked steel strip 13 to a predetermined temperature, an overaging chamber 18 for aging the cooled steel strip 13, and a final cooling chamber 19.
[0004]
As shown in FIG. 11, a radiant tube 5 is generally mounted between the steel strips 13 in the heating chamber 15, and a system in which the steel strip 13 is indirectly heated by the radiant tube 5 is employed. The steel strip 13 introduced through the sealing device 14 is conveyed in the heating chamber 15 by the roll roll 2a and the bottom roll 2b. A radiant rod tube 5 is disposed between the top roll 2a and the bottom roll 2b, and the steel strip 13 is indirectly heated by the radiant tube 5 and heated to a predetermined temperature. The radiant tubes 5 are alternately arranged in the height direction on one side and the other side in the width direction of the steel strip between the steel strip to be conveyed.
[0005]
As shown in FIG. 6, the heating chamber furnace body 15 has a furnace shell made of an iron shell 4 a and a heat insulating material 4 b lined on the iron shell 4 a. Radiant tubes 5 are alternately inserted into the heating chamber furnace body 15 from one side WS and the other side DS in the width direction of the steel strip with the steel strip interposed therebetween.
[0006]
The panel construction method shown in FIG. 7 was used for the assembly construction of the heating chamber furnace body. In FIG. 7, a bottom roll chamber 3 having a bottom roll 2b, a top roll chamber 7 having a top roll 2a, a wife side panel 20, and a furnace side panel 21 are manufactured in a production factory, and these are installed in a local installation factory. It is transported and assembled. Specifically, the bottom roll chamber 3 is installed on the column 1, the wife side panel 20 is mounted on the ball roll chamber 3, and the top roll chamber 7 is placed on the wife side panel 20. When the skeleton of the heating chamber furnace body is formed in this way, the furnace panel 21 is sequentially attached. When the temporary assembly and centering are completed, the joining portion 22 indicated by the thick line is welded to complete the assembly of the furnace. Next, the heat insulating material 4b is stretched from the inside, and the bottom roll 2b and the top roll 2a are installed. Then, the radiant rod tube 5 is attached to the radiant tube mounting frame 6, and the burner 5 c (FIG. 6) is attached to the radiant rod tube 5.
[0007]
As a panel connection structure, Japanese Examined Patent Publication No. 62-38228 discloses a technique in which flat plates for joining panels are welded to the end portions of the panels in advance, and these flat plates are superposed and welded during assembly. ing. As a result, the amount of welding work at the site is greatly reduced, and the installation time is expected to be shortened.
[0008]
[Problems to be solved by the invention]
However, further shortening of the construction period is desired, and the block construction method has been studied. This block construction method is a construction method in which a furnace body is cut into rounds, and the rounded furnace bodies are piled up and applied. The block construction method has already been carried out in a soaking chamber and a cooling room. However, in the radiant tube-type heating chamber, the radiant tubes are alternately inserted from the one side WS and the other side DS of the furnace body at equal intervals. It was impossible to cut a circle because of the split surface. However, as shown in FIG. 8, it is considered that the radian rod tube 5 inserted from one side WS and the other side DS is inserted at intervals as shown in FIG. Since the gap ΔL is opened in the part to be cut, the furnace height L2 becomes higher than the conventional furnace height L1 shown in FIG. 6, the distance between passes becomes longer, which affects the running of the steel strip, and the furnace height increases. As a result, the weight of the furnace body also increased, heat dissipation from the furnace body increased, and it was considered that the equipment would be uneconomical in terms of heat balance, so it was not adopted very much.
[0009]
In view of such problems, the present invention proposes a technique for blocking a radiant rod tube type heating chamber furnace body at a conventional furnace height.
[0010]
[Means for Solving the Problems]
The block structure of the radiant tube type vertical heating chamber furnace body of the present invention is provided with a plurality of rows of rolls for conveying steel strips at the top and bottom, and disposed between the rolls at the top and bottom, In a vertical radiant tube type heating chamber furnace body that indirectly heats a steel strip by means of a radiant tube disposed alternately and in the height direction on one side and the other side in the width direction of the steel strip between the steel strips, the heating chamber The furnace body is a heating chamber furnace body that stacks and joins blocks in which a division surface obtained by dividing the furnace body in a cross-sectional direction of the furnace body between frames in which a radiant rod tube is attached, and a steel strip is bonded to the division surface. It is characterized in that the inclined surface inclined to avoid the radiant tube mounting frame following the horizontal plane which divides between the radiant tube and the lower radiant tubes of the upper block in the width direction is formed .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
1 is a perspective view of a vertical furnace equipped with a radiant tube according to the present invention, FIG. 2 is a side view thereof, FIG. 3 is a perspective view showing a state in which the furnace shell blocks according to the present invention are stacked, and FIG. FIG. 5 is an explanatory diagram of a method of connecting the upper and lower furnace shell blocks according to the present invention.
[0012]
1 and 2, a bottom roll chamber 3 in which a plurality of bottom rolls 2 b are arranged is fixed on a support column 1. On the bottom roll chamber 3, a plurality of furnace shell blocks 4 formed by a square-shaped furnace shell 4 a, a heat insulating material 4 b, and a support column 12 are overlapped and joined.
[0013]
In each furnace shell block 4, radiant tubes 5 are alternately arranged in the height direction from one side and the other side in the width direction of the steel strip. The radiant tube 5 is inserted and attached from the radiant tube mounting frame 6 of the furnace shell 4a. Each radiant tube 5 is equipped with a burner (not shown) outside the furnace shell.
[0014]
Inside the furnace shell 4a, a ceramic fiber as a heat insulating material, for example, a heat insulating material 4b of a fiber block is lined. A top roll chamber 7 in which a plurality of top rolls 2 a are arranged is fixed on the uppermost furnace shell block 4.
[0015]
Next, the dividing surface 8 of the furnace shell block 4 will be described.
[0016]
3 and 4, the upper dividing surface 8 of the furnace shell block 4 extends from the lower radiant tube attachment frame 6 b side (DS) of the furnace shell block 4 stacked on the upper side to the upper radiant tube attachment frame 6 a side (WS). The upper and lower radiant tubes 5a and 5b are horizontally divided over a length of 2/3 or more of the furnace width, and then inclined upward to avoid the upper radiant tube mounting frame 6a. Then, it is divided horizontally on the radiant tube mounting frame 6a.
[0017]
On the other hand, the lower dividing surface 8 of the furnace shell block 4 also has upper and lower radiant tubes from the lower radiant tube attachment frame 6b side (DS) of the furnace shell block 4 toward the upper radiant tube attachment frame 6a side (WS). The space between 5a and 5b is divided horizontally over a length of 2/3 or more of the furnace width, and is then divided so as to be inclined upward and avoid the upper radiant tube mounting frame 6a of the lower furnace shell block 4. Then, it is divided horizontally on the radiant tube mounting frame 6a.
[0018]
As described above, in the present invention, the dividing surface 8 is divided by being inclined so as to avoid the radiant tube mounting frame 6a, so there is no need to make a gap ΔL for cutting as shown in FIG. It becomes possible to make a block at the furnace height.
[0019]
The reason why the horizontal plane 8a is set to 2/3 or more of the furnace width is that when the furnace width is shorter than 2/3 of the furnace width, the sitting of the furnace shell block 4 becomes very unstable. The inclination angle of the inclined surface 8b is preferably 30 to 45 degrees. When the inclination angle is smaller than 30 degrees, it is difficult to produce the inclined surface 8b. When the inclination angle is larger than 45 degrees, it becomes difficult to seal between the furnace shell blocks 4 when the blocks are joined by welding.
[0020]
Next, a method for assembling a heating chamber furnace body using the furnace shell block according to the present invention will be described.
[0021]
In FIG. 5, a lower connection frame 9 made of a shape steel such as an angle steel or a grooved steel is made of steel along the horizontal and inclined surfaces of the dividing surface 8 at the upper part of the furnace shell 4 a of the lower furnace shell block 4. It is welded to the furnace shell 4a. Further, an upper connection frame 10 made of a section steel such as an angle steel or a grooved steel is formed in the furnace shell 4a along the horizontal and inclined surfaces of the dividing surface 8 below the furnace shell 4a of the upper shell block 4. Welded.
[0022]
In addition, a ceramic packing 11 is attached to the upper surface of the fiber block, which is a refractory material 4b lined on the dividing surface 8 of the lower furnace shell block 4, in order to improve the sealing performance between the furnace shell blocks 4. .
[0023]
In the field, after stacking the upper furnace shell block 4 on the lower furnace shell block 4, the horizontal portion 9 a and the inclined portion 9 b of the lower connection frame 9 of the lower furnace shell block 4, and the furnace shell of the upper furnace shell block The horizontal portion 10a and the inclined portion 10b of the upper connection frame 10 are welded together and connected to 4a. By assembling and fixing the furnace shell block in this manner, the radiant tube is mounted on the radiant tube mounting frame. The heating chamber furnace body is assembled by repeating the above steps.
[0024]
In addition, in order to further shorten the construction period at the installation site, a radiant tube may be attached in advance to the radiant tube mounting frame of each furnace shell block, and this may be stacked and fixed on site and welded. .
Since the upper and lower connecting frames 10 and 9 for fixing the furnace shell blocks are composed of the horizontal portions 9a and 10a and the inclined portions 9b and 10b, a right-angle portion is not formed. Welding becomes easy and the sealing performance can be improved.
[0025]
【The invention's effect】
According to the present invention, since the split surface of the furnace shell block is composed of a horizontal surface and an inclined surface, it becomes possible to divide without increasing the furnace height, and further, there is no perpendicular portion to the weld line due to the inclined surface. It is possible to improve the sealing performance at the joint between the furnace shell blocks. Further, by setting the horizontal surface of the dividing surface to 2/3 or more of the furnace width, the sitting of the furnace shell block is well stabilized and there is no fear of tilting.
[Brief description of the drawings]
FIG. 1 is a perspective view of a heating chamber according to the present invention.
FIG. 2 is a side view of FIG.
FIG. 3 is a perspective view showing a state where furnace shell blocks are stacked.
FIG. 4 is an explanatory diagram of furnace shell block division according to the present invention.
FIG. 5 is an explanatory diagram of a method for connecting an upper furnace shell block and a lower furnace shell block according to the present invention.
FIG. 6 is a side view of a heating chamber assembled according to the present invention.
FIG. 7 is a perspective view of a heating chamber assembled by a conventional panel method.
FIG. 8 is a side view of a heating chamber assembled by a conventional block method.
FIG. 9 is a layout diagram of a continuous annealing furnace.
FIG. 10 is a layout diagram of a continuous annealing furnace.
FIG. 11 is a layout diagram of a heating chamber.
[Explanation of symbols]
1: Strut 2a: Top roll 2b: Bottom roll 3: Bottom roll chamber 4: Furnace block 4a: Furnace shell (iron skin)
4b: Refractory material 5: Radiant tube 5a, 5b: Radiant tube 5c: Burner 6: Radiant tube mounting frame 6a: Upper radiant tube mounting frame 6b: Lower radiant tube mounting frame 7: Top roll chamber 8: Dividing surface 8a: Horizontal surface 8b : Inclined surface 9: Lower connection frame 9a: Horizontal portion 9b: Inclined portion 10: Upper connection frame 10a: Horizontal portion 10b: Inclined portion 11: Packing 12a: Upper strut 12b: Lower strut 13: Steel strip 14: Sealing device 15: Heating chamber (heating chamber furnace body) 16: Soaking chamber 17: Cooling chamber 18: Overaging chamber 19: Cooling chamber 20: Incoming wife side panel 21: Furnace panel 22: Joint

Claims (5)

A plurality of rows of rolls for conveying the steel strip are provided at the top and bottom, and are arranged between the rolls at the top and bottom, and between the steel strip and the steel strip to be conveyed on one side and the other side in the width direction of the steel strip. In a vertical radiant tube type heating chamber furnace that indirectly heats steel strips by radiant tubes arranged alternately and in the height direction,
The heating chamber furnace body is a heating chamber furnace body for stacking and joining blocks forming a split surface obtained by dividing the furnace body in a cross-sectional direction of the furnace body between frames for mounting the radian tube.
An inclined surface that is inclined to avoid the radiant tube mounting frame is formed following the horizontal plane that divides the radiant tube of the upper block and the lower radiant tube in the width direction of the steel strip on the dividing surface. A block structure of a vertical radiant tube type heating chamber furnace. 2. A block of a vertical radiant tube type heating chamber furnace body according to claim 1, wherein an inclined surface which is inclined so as to avoid the radiant tube mounting frame is formed following a horizontal surface formed by 2/3 or more of the furnace width. Construction.   The block structure of a vertical radiant tube heating chamber body according to claim 1 or 2, wherein the inclined surface of the dividing surface has an inclination angle of 30 to 45 degrees.   4. A vertical radiant tube type heating chamber furnace body according to claim 1, 2 or 3, wherein a joining frame for joining the upper and lower blocks stacked is arranged on the upper and lower parts of the furnace shell forming the block. Block structure.   5. The block structure of a vertical radiant tube type heating chamber furnace body according to claim 1, wherein the width of the joining frame at the upper part of the block is wider than the width of the joining frame at the lower part of the block.

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