Distillation: apparatus – Apparatus – Elements
Reexamination Certificate
1999-12-22
2004-05-11
Caldarola, Glenn (Department: 1764)
Distillation: apparatus
Apparatus
Elements
C052S086000, C202S267100, C202S267200, C202S270000, C202S239000, C110S336000, C110S337000, C110S338000, C110S339000, C110S340000, C110S344000, C105S004100, C105S004200, C105S004300, C105S004400, C105S163100, C105S163200, C105S215200, C105S433000
Reexamination Certificate
active
06733635
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method of repairing a coke oven buckstay and a moving device for use in such method.
2. Description of the Related Art
The coke oven buckstay is a reinforcing part that supports coke oven walls and that is provided for eliminating the problem of the oven walls breaking or collapsing as a result of expansion of bricks forming the oven walls.
FIG. 1
is a perspective view of what is called a chamber-oven-type coke oven. The coke oven comprises carbonization chambers
52
in which coal is carbonized; combustion chambers
54
in which fuel gas is burned; and a regenerating chamber
59
for pre-heating the fuel gas and combustion air by making use of heat left in the exhaust combustion gas. The carbonization chambers
52
and the combustion chambers
54
are alternately disposed on the top portion of the regenerating chamber
59
, forming a group of component parts of the oven. The coal, which has been put into the carbonization chambers
52
by a coal-charging car
51
that moves on the top portion of the coke oven, is carbonized as a result of being subjected to heat from the combustion chambers
54
located on both sides of the carbonization chambers
52
corresponding thereto. Oven doors
58
and
60
are removably disposed on each end of the carbonization chamber. After the oven doors
58
and
60
of the carbonization chamber
52
have been opened, the carbonized coal, that is, coke is pushed out by a pushing ram of pusher machine
55
through a guide car
56
, and transported to hot coke quenching facility (not shown) through a coke bucket car
53
. Side
3
, at which the pusher machine
55
is disposed, is called the machine side (hereinafter referred to as M/S), while side
4
, at which the guide car
56
is disposed, is called the coke side (hereinafter referred to as C/S). The directions of a line connecting the M/S and the C/S are called the longitudinal directions of the oven, and the longitudinal directions are represented by a double-headed arrow
61
. The directions in which the combustion chambers
54
and the carbonization chambers
52
are arranged are called the widthwise directions, and are represented by a double-headed arrow
62
.
FIG. 2
is a sectional view of the coke oven as viewed perpendicular to the longitudinal directions thereof. At the outer sides of the coke oven are disposed M/S and C/S platforms
11
a
,
11
b
along the widthwise directions thereof. These platforms
11
a
,
11
b
are used when, for example, maintaining the oven doors
58
and
60
in an open position. On the top portion of the C/S platform
11
b
are disposed rails
12
on which the guide car moves. Below the M/S platform
11
a
are disposed rails
22
on which the pusher machine moves. As shown in
FIG. 2
, the coke oven is formed by oven walls
2
formed by placing a plurality of layers of fire-resistant bricks (hereinafter simply referred to as “bricks”) upon one another. Pillered steel members or buckstays
5
are disposed vertically in a standing manner at the M/S and the C/S of the oven walls
2
so as to hold and compress them. Tension rods
6
are disposed at the top and the bottom ends of the oven walls
2
disposed at both ends of the coke oven extending in the longitudinal directions thereof. The tension rods
6
are secured to the buckstays
5
with bolts from both ends thereof. The directions in which the securing forces act are represented by arrows
31
. Here, the bolts are sometimes secured through springs
7
a
provided at the ends of tension rods
6
. (The securing of the bolts is hereunder referred to as “securing of the oven”.) Outward deformation of the buckstays
5
may be reduced by pushing in an intermediate portion of the buckstays
5
in a direction opposite the platforms
11
a
,
11
b
by the springs
7
b
from respective frames of the platforms
11
a
,
11
b.
However, when the coke oven has been in operation for a long time, the C/S buckstay
5
a
may become deformed, as shown in FIG.
3
. When this occurs, the coke oven is less properly secured because the bolt-securing forces are not applied to the bricks. The reduced securing forces cause severance and misalignment of the joints between the bricks making up the oven walls. Gaps are produced between the various fittings and the bricks. This results in poor environmental control and undesirable conditions which result, for example, when gas, produced by carbonization of coal, leaks from the gaps between the fittings and the bricks, and black smoke exhausts from a chimney of the coke oven. In addition, increased deformation of the oven body or the buckstay
5
a
results when carbon that has adhered to the severed joints of the bricks grows excessively. To overcome the above-described problems, the operation of the carbonization chamber near the combustion chamber
54
at the location of a considerably deformed part of the coke oven (such as the buckstay
5
a
) is stopped. Other parts may be kept in operation while the damaged parts are replaced. At the same time that the replacement is being carried out, the bricks of the coke oven may be re-stacked.
FIGS. 4A
to
4
C illustrate a conventional method of repairing the buckstay of the coke oven. The procedure is as follows.
As shown in
FIG. 4A
, a crane
38
is placed in front of the oven with the combustion chamber
54
at which a considerably deformed part is located. The crane
38
is usually disposed on the ground at a distance of at least ten meters from the oven in a horizontal direction. A boom
35
of the crane
38
is extended to a height that allows the buckstay
5
a
to be suspended. It is usually extended to a height of about 30 meters from the ground. As shown in
FIG. 4B
, the buckstay
5
a
is supported and secured to a binding jig
36
mounted to an end of the boom
35
. At a location
37
that is about 500 mm above the platform
11
, the defective portion of the buckstay
5
a
is cut away. Thereafter, as shown in
FIG. 4C
, the separated portion of the buckstay
5
b
is suspended by the boom
35
that has moved to remove it. After the removal, a new steel member is suspended by the crane and mounted and welded to the remaining undeformed portion of the buckstay in order to affix it thereto.
However, depending on the arrangement of the peripheral facilities of the coke oven, it is probable that a crane may not be disposed in front of the combustion chamber at which the deformed part is located.
Additionally, even when the crane may be disposed so as not to interfere with the peripheral facilities, the boom may not be able to extend to the platform at which the deformed part is located, thus replacing and repairing operations would be prevented. For example, the M/S buckstay
5
of the coke oven shown in
FIG. 2
cannot be repaired. This is because, as shown in
FIG. 2
, collecting main
21
, that are provided above each of the buckstays
5
as paths for allowing carbonization gas to flow therethrough, interfere with the boom of the crane.
Repairing operations are usually carried out while most unaffected component parts of the coke oven are in operation. Obviously, the combustion chamber at which the buckstay to be repaired is located and the carbonization chambers near this combustion chamber are taken out of operation during repair. Repairing operations must be carried out quickly to avoid costly down time. However, due to the above-described problems, it takes time to carry out the repairing operations. Therefore, there has been a strong demand for an improved repairing method.
SUMMARY OF THE INVENTION
Accordingly, in view of the above-described problems, it is an object of the present invention to provide a coke oven buckstay repairing method which can be carried out more quickly, reliably, and smoothly than the conventional repairing method; and a moving device used in such method. To achieve this object, the present inventor has assiduously conducted research. Preferred embodiments of the present invention are discussed below.
According to one
Kamide Nobuya
Ozawa Tatsuya
Tamura Nozomu
Uchida Tetsuro
Caldarola Glenn
JFE Steel Corporation
Piper Rudnick LLP
Wachtel Alexis
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