Piping support of gas turbine steam cooled combustor

Details Piping support of gas turbine steam cooled combustor Piping support of gas turbine steam cooled combustor

2000-07-24

2003-02-25

Freay, Charles G. (Department: 3746)

Power plants

Combustion products used as motive fluid

Having mounting or supporting structure

C060S730000, C138S103000, C248S062000

Reexamination Certificate

active

06523352

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a piping support of a gas turbine steam cooled combustor and more particularly to a piping support so improved that even when the piping support is damaged by combustion vibration, etc., dropping thereof is prevented so as to avoid an intrusion of fractions into a turbine portion, thereby preventing an accident including gas turbine blades, etc.
2. Description of the Prior Art
FIGS.
5
(
a
) and (
b
) show an example of a gas turbine steam cooled combustor to which piping supports in the prior art are applied, wherein FIG.
5
(
a
) is a plan view, and FIG.
5
(
b
) is a side view. In FIGS.
5
(
a
) and (
b
), a tail tube
102
of the combustor comprises a combustion gas outlet
104
, through which a high temperature combustion gas is supplied into a gas path of the gas turbine. The tail tube
102
also comprises a by-pass pipe connecting port
103
for taking air from a turbine cylinder and a steam piping
101
is disposed around the by-pass pipe connecting port
103
. The steam piping
101
is a piping through which cooling steam is supplied from a steam supply port
105
into a cooling passage provided on an inner circumferential wall of the tail tube
102
of the combustor and, after having cooled the wall of the tail tube
102
and elevated of temperature, is recovered from a steam recovering port
106
. The steam piping
101
is supported by piping supports
110
,
111
,
112
and each of the piping supports
110
,
111
,
112
is fixed to an outer wall of the tail tube
102
of the combustor.
FIGS.
6
(
a
) to (
c
) show the piping support
110
, wherein FIG.
6
(
a
) is a front view as seen from arrows on line D—D of FIG.
5
(
a
), FIG.
6
(
b
) is a plan view and FIG.
6
(
c
) is a side view. In FIGS.
6
(
a
) to (
c
), the steam piping
101
is supported such that the steam piping
101
is pinched between upper and lower clamps
121
,
122
via a spacer
125
disposed around the steam piping
101
. The upper and lower clamps
121
,
122
are fastened together by bolts
uts
123
,
124
and the lower clamp
122
is fixed by welding to the outer wall of the tail tube
102
via a fitting member
122
a
. The present example is an example where the lower clamp
122
has its one end fitted with the fitting member
122
a
to thereby support the steam piping
101
at the one end.
FIGS.
7
(
a
) to (
c
) show the piping support
111
, wherein FIG.
7
(
a
) is a front view seen from arrows on line E—E of FIG.
5
(
a
), FIG.
7
(
b
) is a plan view and FIG.
7
(
c
) is a side view. In FIGS.
7
(
a
) to (
c
), like FIGS.
6
(
a
) to (
c
), the steam piping
101
is supported such that the steam piping
101
is pinched between upper and lower clamps
221
,
222
via a spacer
225
disposed around the steam piping
101
. The upper and lower clamps
221
,
222
are fastened together by bolts
uts
223
,
224
and a central portion of the lower clamp
222
is fixed by welding to the outer wall of the tail tube
102
via a fitting member
222
a
. The present example is an example where the lower clamp
222
has its central portion fitted with the fitting member
222
a
to thereby support the steam piping
101
at the central portion.
FIGS.
8
(
a
) to (
d
) show the piping support
112
, wherein FIG.
8
(
a
) is a front view seen from arrows on line F—F of FIG.
5
(
a
), FIG.
8
(
b
) is a plan view, FIG.
8
(
c
) is a side view and FIG.
8
(
d
) is a bottom view. In FIGS.
8
(
a
) to (
d
), the steam piping
101
is supported such that the steam piping
101
is pinched between upper and lower clamps
321
,
322
via a spacer
325
disposed around the steam piping
101
. The upper and lower clamps
321
,
322
are fastened together by bolts
uts
323
,
324
and the lower clamp
322
is fixed by welding to the outer wall of the tail tube
102
via fitting members
322
a
,
322
b
joined together in an L-shape. The present example is an example where the fitting members
322
a
,
322
b
joined together in the L-shape are interposed to thereby support the steam piping
101
.
As mentioned above, the conventional steam piping
101
is fixedly supported using the upper and lower clamps, spacer and bolts
uts so as to defend against vibration, etc., wherein the lower clamp is fixed to the wall surface of the tail tube
102
via the fitting member
122
a
or
222
a
, or the fitting members
322
a
,
322
b
, selected corresponding to a curved surface of the tail tube
102
.
In the conventional gas turbine steam cooled combustor as mentioned above, the steam piping for the cooling steam is provided on the wall surface of the tail tube to be supported such that the steam piping is fixed to the piping support and the piping support is fixed by welding to the wall surface of the tail tube. The piping support comprises the upper and lower clamps, both made in a C-shape, and the piping support is so constructed that the steam piping is pinched between the upper and lower clamps via the spacer. The upper and lower clamps are fastened together by the bolts
uts and the piping support is fixed to the wall surface of the tail tube. While the gas turbine is operated, a combustion vibration occurs and in the piping support so constructed, there may be a case where the fixation of the fitting member is loosened and should the fitting member be damaged and detached from the wall surface of the tail tube or the bolts
uts be loosened by vibration, for example, then the clamps may drop out from the piping so that fractions thereof may enter a turbine portion together with combustion gas and in such a case, there is a large possibility that the gas turbine will be seriously damaged with regard to the blades, etc.
SUMMARY OF THE INVENTION
In view of the mentioned problem in the prior art, it is an object of the present invention to provide a piping support of a gas turbine steam cooled combustor in which the piping support supporting a steam piping has a construction so improved that even when the piping support is damaged by combustion vibration of the combustor or the like, dropping of the piping support out from the steam piping is prevented, so as to avoid an intrusion of fractions of the piping support into a turbine portion to thereby prevent an accident concerning gas turbine blades, etc.
In order to achieve the object, the present invention provides the following.
A piping support of a gas turbine steam cooled combustor, characterized in that the piping support comprises a ring fitted around a steam piping so as to be fixed to each other and an outer fitting member formed in a U-shape so that the ring makes contact with an inner circumferential surface portion of the outer fitting member to be fixed to each other. The outer fitting member at both ends thereof opposite to the inner circumferential surface portion is fixed to a wall surface of a tail tube.
In the piping support of the present invention, the ring is fitted around the steam piping and the steam piping at the outer circumferential surface thereof is fixed to the ring by welding or the like. The ring at the outer circumferential surface thereof makes contact with the inner circumferential surface portion of the outer fitting member formed in the U-shape so as to be fixed to each other by welding or the like. Thus, the steam piping is supported to the wall surface of the tail tube via the ring and the outer fitting member. As the ring and the outer fitting member are fixed to each other, even when the outer fitting member is detached from the wall surface of the tail tube due to fatigue by combustion vibration or the like, the outer fitting member is supported by the steam piping via the ring and no case of the outer fitting member being dropped from the piping occurs. Hence, there arises no case of dropped fractions of the piping support coming into the gas path of the gas turbine and turbine blades and the like are prevented from being damaged.


REFERENCES:
patent: 2546533 (1951-03-01), Williamson
patent: 4487014 (1984-12-01), Vinciguerra
pate

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