JPH09303706A - Repair method for furnace wall pipe, and pipe bender used for its execution - Google Patents

Abstract

PROBLEM TO BE SOLVED: To repair a furnace wall pipe from outside the furnace without setting up a scaffold, etc., within the furnace of a boiler. SOLUTION: The damage 11 part of a furnace wall pipe 11 is taken away including its periphery, and the furnace wall pipe 11 is bent so as to turn both ends at an opening of the furnace wall pipe 11 brought into existence by the removal of the damage 11 part outward, and then a new furnace wall pipe 12 is arranged between the ends at the opening. Then, these furnace wall pipes 11 and 12 are joined to couple the fellow ends at the opening, and a refractory material 13 is attached to the junction part, and also the refractory material 13 as surrounded by a seal box 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of repairing a furnace wall tube for repairing damage caused to the furnace wall tube of a boiler furnace and a tube bending apparatus used for carrying out the method.

[0002]

2. Description of the Related Art When a furnace wall tube of a furnace constituting a pressure-resistant portion of a boiler is damaged by cracks or the like, wait until the temperature in the furnace is lowered until starting work can be performed in the furnace. As shown in FIG. 2, the worker 20 enters the furnace 10, and after assembling the scaffold 21 from the bottom of the furnace 10, the damaged furnace wall tube is extracted, a new furnace wall tube is inserted, and the inside and outside of the furnace 10 is concerned. Repair was performed by welding and joining the furnace wall tube.

[0003]

Therefore, even if the number of the damaged furnace wall tube is one, the furnace 1 is operated as described above.
Since the scaffold 21 must be assembled within 0 to carry out the repair work, even a slight repair requires a great deal of labor and time, and the operating rate of the boiler is significantly reduced.

[0004]

A method for repairing a furnace wall tube according to the present invention for solving the above-mentioned problems is a method for repairing a furnace wall tube for repairing damage caused to the furnace wall tube of a boiler furnace. And removing the damaged portion of the furnace wall tube, including its periphery, from the furnace, and directing the opposite open ends of the furnace wall tube resulting from the removal of the damaged portion to the outside of the furnace, respectively. After bending the wall tube, a new furnace wall tube is provided between the opening ends of the furnace wall tube, and the furnace wall tubes are joined so as to connect the opening ends.

Further, a pipe bending device used for carrying out the above-mentioned method for repairing a furnace wall pipe is provided with a substantially U-shaped arm and one end side of the arm, and an operation point is provided on the other end side of the arm. Urging means capable of urging while moving toward the urging means, a pressing die provided at the operating portion of the urging means and engageable with a furnace wall tube, and provided at the other end side of the arm, And a receiving mold engageable with the wall pipe.

[0006]

1 shows an embodiment of a method for repairing a furnace wall tube and a tube bending apparatus used for carrying out the method according to the present invention.
This will be described with reference to 6 above. 1 is a partial cross-sectional side view showing the structure of the pipe bending apparatus, FIG. 2 is a view taken along the line II-II of FIG. 1, and FIG. 3 is a view taken along the line III-III of FIG. Figure 4
FIG. 5 is a schematic structural diagram of a furnace of a boiler, FIG. 5 is an explanatory diagram of a procedure of a method for repairing a furnace wall tube, and FIG. 6 is a usage explanatory diagram of a tube bending device.

As shown in FIG. 1, at one end of the arm 1 having a substantially U-shape, the tip of a cylinder rod 3a, which is a working point of a hydraulic cylinder 3 as a biasing means, is provided at the other end of the arm 1. It is attached via a mounting flange 2 so as to face toward. A pressing die 5 having a groove 5a engageable with the furnace wall tube 11 is attached to the tip of the cylinder rod 3a of the hydraulic cylinder 3 via a joint 4 so that the groove 5a is directed to the other end side of the arm 1. Has been.

As shown in FIGS. 2 and 3, on the mounting flange 2, a pair of guide shafts 6 sandwiching the hydraulic cylinder 3 are slidably movable along the extension / contraction direction of the cylinder rod 3a of the hydraulic cylinder 3. It is provided. The tip end of the guide shaft 6 is connected to the base end of the pressing die 5. That is, by expanding and contracting the cylinder rod 3a of the hydraulic cylinder 3, the pressing die 5 can be biased while being guided toward the other end of the arm 1 while being guided by the guide shaft 6. .

On the other hand, as shown in FIG. 1, on the other end side of the arm 1, a receiving mold 7 having a groove 7a engageable with the furnace wall tube 11 is formed.
Are provided so that the groove 7a faces the one end side of the arm 1, and the receiving mold 7 is arranged so as to form a pair along the longitudinal direction of the arm 1 at a predetermined interval. There is. In FIG. 1, reference numeral 1a is a hanging metal fitting hole, and 2a is a hanging fitting, which can assist the work and prevent falling.

Next, a method of repairing a furnace wall tube using such a tube bending apparatus will be described. First, the furnace wall tube 11 is damaged 11
When a occurs (FIG. 5 (a)), the damaged portion 11a of the furnace wall tube 11 including its periphery is removed from the furnace 10 (FIG. 5 (b)).

Next, the groove 7a of the die 7 of the tube bending apparatus is engaged with one side of the open end of the furnace wall tube 11 generated from the removal of the damaged portion 11a from the outside of the furnace 10 (see FIG. 6).
(A)), the cylinder rod 3a of the hydraulic cylinder 3 is extended to engage the groove 5a of the pressing die 5 with the furnace wall tube 11 (FIG. 6 (b)), and the cylinder rod 3a of the hydraulic cylinder 3 is further extended. Is extended to bend the furnace wall tube 11 so that the open end of the furnace wall tube 11 faces the outside of the furnace 10 (FIG. 6C).

When the open end of the furnace wall tube 11 is directed to the outside of the furnace 10 in this way (FIG. 5 (c)), the other side of the open end of the furnace wall tube 11 is also furnaced in the same manner as described above. It is bent to the outside of 10 (Fig. 5 (d)).

Subsequently, the furnace wall tube 11 is introduced from the outside of the furnace 10.
After processing the above-mentioned open end (length adjustment, groove processing, etc.),
A new furnace wall tube 12 is arranged between the open ends of the furnace wall tube 11 (Fig. 5 (e)), and the open ends of the furnace wall tubes 11 and 12 are joined by welding from the outside of the furnace 10. After that, the refractory material 13 is attached to the peripheral portion of the location from the outside of the furnace 10, and the refractory material 13 is surrounded by the seal box 14 (FIG. 5 (f)), thereby completing the repair.

That is, the damaged portion 11a of the furnace wall tube 11 can be repaired only from the outside of the furnace 10.

Therefore, since it is not necessary to assemble a scaffold in the furnace 10, the labor and time required for repair can be significantly reduced, and the operating rate of the boiler can be significantly improved.

[0016]

According to the method of repairing the furnace wall tube of the present invention, since the damaged portion of the furnace wall tube can be repaired only from the outside of the furnace, there is no need to purposely assemble a scaffold in the furnace, and repairing The labor and time required for the boiler can be significantly reduced, and the operating rate of the boiler can be significantly improved.

Further, according to the pipe bending apparatus of the present invention used for carrying out the above-mentioned furnace wall pipe repairing method, the above-mentioned furnace wall pipe repairing method can be efficiently carried out.

[Brief description of drawings]

FIG. 1 is a partial sectional side view showing a structure of an embodiment of a pipe bending apparatus according to the present invention.

FIG. 2 is a view taken along the line II-II of FIG.

FIG. 3 is a view taken along the line III-III in FIG. 1;

FIG. 4 is a schematic structural diagram of a boiler furnace.

FIG. 5 is an explanatory diagram of a procedure of a method for repairing a furnace wall tube.

FIG. 6 is an explanatory view of using the pipe bending apparatus.

FIG. 7 is an explanatory diagram of a conventional method for repairing a furnace wall tube.

[Explanation of symbols]

 1 Arm 2 Mounting Flange 3 Hydraulic Cylinder 5 Push Type 5a Groove 6 Guide Shaft 7 Receiving Type 7a Groove 10 Furnace 11, 12 Furnace Wall Tube 11a Damage 13 Refractory Material 14 Seal Box

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Hisamitsu Uchiya 1-1-1, Wadazaki-cho, Hyogo-ku, Kobe-shi, Hyogo Prefecture Mitsubishi Heavy Industries, Ltd. Kobe Shipyard (72) Inventor Jun Ono Hyogo-ku, Kobe-shi, Hyogo Prefecture 1-1-1 Wadazakicho Mitsubishi Heavy Industries Ltd. Kobe Shipyard

Claims (2)

[Claims] 1. A method for repairing a furnace wall tube for repairing damage caused to a furnace wall tube of a boiler furnace, wherein the damaged portion of the furnace wall tube including its peripheral portion is removed from the furnace, and the damaged portion is removed. After bending the furnace wall tube so that the opposing open ends of the furnace wall tube caused by the removal of the parts are respectively directed to the outside of the furnace, a new furnace wall tube is provided between the open ends of the furnace wall tube. A method for repairing a furnace wall pipe, which is characterized in that the furnace wall pipes are joined so as to connect the open ends to each other. 2. A substantially U-shaped arm, an urging means provided on one end side of the arm and capable of urging while moving an operating portion toward the other end side of the arm, and the urging means. And a push die that is provided at the operating location and is engageable with the furnace wall tube, and a receiving die that is provided at the other end of the arm and is engageable with the furnace wall tube. A pipe bending apparatus used for carrying out the method for repairing a furnace wall pipe according to claim 1.