JP2001055576A - Repair method of coke oven dry main - Google Patents

Abstract

(57) [Summary] [Problem] To prevent a gap from being present between valve seats.
Welding the backing plate with the dry main or adjustment liner. SOLUTION: This method is a method for repairing patching by bringing a corroded portion generated on an upper surface and a side surface of a dry main of a coke oven into contact with a backing plate material. The vertical wall side portion 3a excluding the valve seat 4 in at least the upper half of the dry main 3 at the installation position of the valve seat 4, or the installation position of at least the upper half of the dry main 3 and both adjacent valve seats 4 between adjacent valve seats 4. The cover plates 11 and 12 covering a predetermined range of the curved wall side portion 3b excluding the valve seat 4 in at least the upper half of the dry main 3;
It is connected by welding to the main body 3 of the dry main body and the adjustment liner 9 provided between the main body of the dry main body 3 and the valve seat 4. [Effect] Eliminates gas leaks, and also avoids furnace body damage, black smoke generation and high investment at the time of renewal construction, and greatly extends the useful life of the dry main body. it can.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of collecting coke oven gas generated in a coke oven from a coking chamber through a riser tube and a bend tube. The present invention relates to a method for repairing a generated corrosion portion.

[0002]

2. Description of the Related Art A connection state between each carbonization chamber of a coke oven and a dry main will be described with reference to FIGS. Reference numeral 1 denotes a rising pipe whose lower end is erected in the furnace top brick at the end of each coking chamber so as to communicate with each coking chamber of the coke oven. 2 are respectively flange-connected. On the other hand, on the upper surface of the dry main 3 facing the lower end opening of each of the bend pipes 2, a cast iron plate valve case mounting frame (hereinafter referred to as “valve seat”) which is riveted via an adjustment liner 9. 4, a countersunk valve case 6 is attached using a mallet bolt 5 as shown in FIG.

A non-asbestos packing 8 or the like is filled in an annular packing receiver 6a provided on the upper surface of the plate valve case 6, and an outer wall of the bend pipe 2 is placed in the annular packing receiver 6a filled with the non-asbestos packing 8 or the like. Each of the carbonization chambers and the dry main 3 are connected in an airtight manner by fitting the annular engaging portion 2a protruding from the main body.

In addition, a water seal valve 7 is provided in the plate valve case 6 so that the water seal valve 7 can be opened and closed between a horizontal seal state and a vertical open state. Valve 7
The tip of the bend pipe 2 is inserted into and immersed in the annular safe water receiving portion, so that the gas in the dry main 3 is sealed so as not to flow back into the carbonization chamber of the coke oven.

[0005] By the way, usually, once the coke oven is started to operate, it is set to continuously operate for about 20 years in the past and about 50 years for the currently operating coke oven, and the continuous operation years are further extended. It tends to go. However, the upper surface of the dry main 3 has a flat shape as shown in FIG. 3, so that dust easily accumulates. Further, since the outer surface corrosion due to rainwater and water sprinkling is severe, it is used for a long time. Gas leakage occurs due to a hole in between.

[0006] When such corrosion damage occurs in the dry main, when a hole is caused by slight initial corrosion, it is dealt with by patching repair in which a patch plate is applied to the hole, and when it develops into a severely corroded hole, it becomes dry. It was supported by replacing the main body.

However, the main body of the dry main body is made of general structural steel, and the valve seat for the main body is made of cast iron.
When repairing the corroded portion generated on the upper surface or side surface of the dry main body by using a plate made of structural steel or stainless steel, it is difficult to weld the patch plate material to be patched to the cast iron valve seat. Therefore, when repairing patching, it is usually welded to parts other than the valve seat,
When a load is applied to the dry main below the valve seat mounting portion due to the inclination of the riser or the like, there is a problem that the depression cannot be prevented.

Further, when replacing the dry main body, the entire furnace group must be kept hot in an actual kiln.
In addition to the replacement work, various measures for maintaining the heat are required, which is not only an extremely large-scale work,
It required huge construction costs and considerable days. Furthermore,
Even if sufficient measures are taken to prevent black smoke, the generation of black smoke at the time of startup is difficult to anticipate.
It must be said that dry main renewal is very likely to cause environmental degradation.

Therefore, one of the present inventors is disclosed in
No. 1-179292, an equilateral angle steel is fixed by welding along both side surfaces orthogonal to the longitudinal direction of the dry main of a valve seat attached to the upper surface of the dry main and along the upper half circumference of the dry main. A plurality of fasteners are welded to the angle iron to support the valve seat, and then a reinforcing plate is coated and welded between the equilateral angle irons on the upper half circumference of the dry main to replace the dry main body without replacing the dry main body. A method of patching and repairing a corroded portion near a valve seat has been disclosed. According to this method, the problem associated with the patching repair described above does not occur.

[0010]

However, the repair method disclosed in Japanese Patent Application Laid-Open No. 61-179292 has the following two problems. First, according to the observations of the present inventors, the corrosion of the upper surface of the dry main is most severe at a place a little away from the valve seat, and is deformed. In the case of significant corrosion of irregularities or large holes, welding of the equilateral angle iron, which is the most important in the structure constructed by this repair method, cannot be performed.

Secondly, since there is a gap between the valve seat and the steel strip installed around the valve seat, after the repair, the corrosion re-occurs there, and the dry portion located below the valve seat is located. Concerns about collapse in the main part are to resurface.

An object of the present invention is to provide a coke oven dry main repair method capable of solving the above two problems.

[0013]

In order to achieve the above-mentioned object, a method for repairing a dry coke oven according to the present invention comprises the steps of:
At least the vertical wall side portion of the upper half of the dry main excluding the valve seat at the installation position of the valve seat, or at least the upper half of the dry main between adjacent valve seats and at least the upper half of the dry main at the installation position of both adjacent valve seats The cover plate material covering a predetermined range of the curved wall side portion excluding the valve seat is welded to the dry main body or an adjustment liner provided between the dry main body and the valve seat. And
In this manner, the backing plate and the dry main or the adjustment liner can be welded without leaving a gap between the valve seats.

[0014]

DETAILED DESCRIPTION OF THE INVENTION As a result of investigations by the present inventors, it has been found that almost no corrosion has occurred on the adjustment liner and the dry main body located immediately below the valve seat. Thus, the present invention described below has been established in which these portions are used as welded portions of the backing plate material.

That is, in the method of repairing a dry coke oven of the present invention, the repairing method of patching is performed by bringing a corroded portion generated on the upper surface and side surfaces of the coke oven into contact with a patch plate to repair at least the valve seat at the installation position of the valve seat. Vertical wall side part except the valve seat in the upper half of the dry main,
Alternatively, a patch plate covering at least the upper half of the dry main between the adjacent valve seats and a predetermined area of the curved wall side portion excluding the valve seat in at least the upper half of the dry main at the installation position of the valve seats on both sides is attached to the dry main body or the dry main body. It is connected by welding to the adjustment liner provided between the main body and the valve seat.

According to the present invention, there is provided a method of repairing the upper surface and the side surface of the upper half of a coke oven dry main, wherein at least the valve seat in the upper half of the dry main except for the valve seat at the installation position of the valve seat or the adjacent side. At least the upper half of the dry main between the fitted valve seats and at least the upper half of the dry main at the valve seat installation positions on both sides adopt a patch plate material that covers a predetermined range of the curved wall side portion excluding the valve seat within the valve seat. By welding to the adjustment liner and the dry main body located directly below the seat,
This solves the problem that the welding method disclosed in Japanese Patent No. 79292 cannot be welded and that the gap between the valve seats does not exist.

In the coke oven dry main repair method of the present invention described above, when the hammer-shaped bolt fastening the plate valve case and the valve seat and the backing plate material are welded and connected by the reinforcing rib, the valve seat is originally required. The load generated due to the inclination of the riser and the like acting on the surroundings can be dispersed to the dry main body via the backing plate.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to one embodiment shown in FIGS. FIG. 1 is a perspective view of an essential part showing an embodiment of a coke oven dry main repair method of the present invention, and FIG. 2 is a detailed view of a portion A in FIG. In FIGS. 1 and 2, the same or corresponding parts as those in FIGS. 3 and 4 are denoted by the same reference numerals, and detailed description is omitted.

In FIG. 1 and FIG. 2, reference numeral 11 denotes a patch plate (hereinafter referred to as a "rising pipe side") which covers at least the vertical wall side portion 3a except for the valve seat 4 in the upper half of the dry main 3 at the installation position of the valve seat 4. 12) is a curve excluding at least the upper half of the dry main 3 between the adjacent valve seats 4 and 4, and the valve seat 4 in at least the upper half of the dry main 3 at the position where both adjacent valve seats 4 are installed. A dry plate 3 (hereinafter, referred to as an “upper surface and a vertical side plate”) that covers, for example, half of the dry main 3 in the longitudinal direction of the wall side portion 3b. At least the upper half of the main 3 is covered.

In the coke oven dry main repair method of the present invention, as a pretreatment, first, the upper surface or side surface (vertical wall side portion 3) of the dry main 3 having a corroded portion to be repaired.
a, dust, tar, rust, etc. adhering to the curved wall side portion 3b) are removed.

That is, when the corroded portion is located on the vertical wall side portion 3a of the dry main 3 at the installation position of the valve seat 4, dust, tar,
Remove rust etc.

If there is a corroded portion on the upper surface of the dry main 3 between the adjacent valve seats 4 and 4 or on the curved wall side portion 3b of the dry main 3 at the installation position of the valve seat 4, the upper surface of the dry main 3 In addition, dust, tar, rust, etc. attached to half of the curved wall side portion 3b at the valve seat 4 installation position on both sides are removed.

Then, rust is removed from the welded portion of the outer peripheral portion of the above-mentioned riser tube-side side plate 11 and the upper surface and the vertical side plate 12 covering the portion to be repaired.

After the pretreatment described above, the riser tube-side side plate 11 and the top and vertical side plate 12 are brought into contact with the portion to be repaired.
1 or the outer peripheral portion of the upper and vertical side plate members 12 and the dry main 3 or the adjustment liner 9 are attached by welding. This is the coke oven dry main repair method according to the first aspect of the present invention. According to the coke oven dry main repair method according to the present invention, the backing plate and the dry main 3 or the adjustment liner 9 can be welded without any gap between the valve seats 4.

Although welding may be performed as described above,
In the following case, the load generated due to the inclination of the riser 1 originally acting around the valve seat 4 and the own weight of the valve seat and the disc valve case are transferred to the riser side side plate member 11 and the upper surface. In addition, the load can be dispersed to the main body of the dry main 3 via the vertical side plate member 12.

First, the existing hammer-shaped bolts 5 facing the repaired part are removed one by one. For example, as shown in FIG. 1, in the case of the riser tube side surface contact plate member 11 and the upper surface and the vertical side surface contact plate member 12 adjacent thereto, eight on the upper and lower sides of the dry main 3, the vertical wall side portion 3b for 4 total 1
There are two.

Next, a hammer-shaped bolt 15 to which an upper surface reinforcing rib 14 is attached in advance is provided on the upper surface portion of the dry main 3.
Side reinforcing ribs 1 are provided on the vertical wall side portion 3a of the dry
The hammer-shaped bolt 17 to which the hammer-shaped bolt 6 has been attached in advance is installed in a portion where the hammer-shaped bolt 5 has been removed, and the valve seat 4 and the disc valve case 6 are fastened. Then, after that, the upper surface reinforcing ribs 14 and the upper surface and the vertical side surface supporting plate member 12 are connected to each other, and
6 is welded to the riser tube side surface backing plate 11.

In the present embodiment, an example has been shown in which the curved wall side portion 3b is widely covered with the upper surface and the vertical side plate 12 as the predetermined range. Any range can be used as long as the range can be covered, and the range is not limited.

[0029]

As described above, according to the coke oven dry main repair method of the present invention, the patch containing the corroded portion is repaired by patching, so that there is no gap between the valve seat and the patch plate material. And dry main or adjustment liner can be welded. Therefore, eliminating gas leaks,
Further, it is possible to avoid furnace body damage, black smoke generation at the time of start-up, and high investment, which are feared at the time of renewal work, and it is possible to greatly extend the useful life of the dry main body. Also, when the hammer bolts connecting the plate valve case to the valve seat and the backing plate are welded to each other with reinforcing ribs, the inclination of the riser pipe, the valve seat, the plate valve case, etc. will act on the valve seat. The applied load can be dispersed over a wide area of the dry main body via the contact plate material, and the collapse of the dry main below the valve seat can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view of an essential part showing one embodiment of a coke oven dry main repair method of the present invention.

FIG. 2 is a detailed view of a portion A in FIG.

FIG. 3 is a sectional view showing a method of connecting a coke oven riser and a dry main.

4A is a schematic plan view of the vicinity of a valve seat on the upper surface of a dry main, FIG. 4B is a cross-sectional view taken along line CC in FIG.
(C) is an arrow B view in (a).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rise pipe 2 Bend pipe 3 Dry main 3a Vertical wall side part 3b Curved wall side part 4 Valve seat 9 Adjustment liner 11 Rise pipe side side backing plate material 12 Upper surface and vertical side surface backing plate material 14 Upper surface reinforcing rib 15 Hammer bolt 16 Side reinforcement Rib 17 hammer bolt

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kazuki Takeshima 1850 Minato, Wakayama City, Wakayama Prefecture Sumitomo Metal Industries, Ltd.Wakayama Works (72) Inventor Kazuo Mukaiyama 1850 Minato, Wakayama City, Wakayama Prefecture Sumitomo Metal Industries, Ltd. Wakayama Works

Claims (2)

[Claims] 1. A method of repairing patching by causing a corroded portion generated on an upper surface and a side surface of a dry main of a coke oven to abut against a backing plate material, wherein at least a plate in an upper half of the dry main at an installation position of a plate valve case mounting frame. At least the upper half of the dry main between the vertical wall side portion excluding the valve case mounting frame, or between the adjacent flat valve case mounting frames, and at least the upper dry main upper half of the dry main at the mounting position of the adjacent dry valve case mounting frames. Coke oven dry main repair, characterized in that a patch plate covering a predetermined area of the curved wall side excluding the frame is welded and connected to the dry main body or an adjustment liner interposed between the dry main body and the plate valve case mounting frame. Method. 2. The coke oven dry main repair method according to claim 1, wherein the hammer-shaped bolt for fastening the plate valve case and the plate valve case mounting frame and the backing plate material are welded and connected with reinforcing ribs. Disperse the load generated by the inclination of the riser pipe acting around the plate valve case mounting frame, and the weight of the plate valve case mounting frame and the plate valve case, etc., to the dry main body via the stiffener. Coke oven dry main repair method characterized by the above-mentioned.