U.S. patent application number 09/984121 was filed with the patent office on 2002-02-28 for gas turbine generator plant.
This patent application is currently assigned to Mitsubishi Heavy Industries, Ltd.. Invention is credited to Nagai, Hidekazu, Takamatsu, Masaru.
Application Number | 20020023424 09/984121 |
Document ID | / |
Family ID | 26528091 |
Filed Date | 2002-02-28 |
United States Patent
Application |
20020023424 |
Kind Code |
A1 |
Takamatsu, Masaru ; et
al. |
February 28, 2002 |
Gas turbine generator plant
Abstract
The present invention relates to a gas turbine generator plant
in which, by forming auxiliary equipment, comprising a starter, a
lubricating oil device, a control oil device, and a lubricating oil
main tank, into a unit, this may be disposed within a building in a
unitary manner with a generator and a gas turbine unit. The gas
turbine generator plant of the present invention is provided with a
generator, a gas turbine unit, and auxiliary equipment, comprising
a starter, a lubricating oil device, a control oil device, and a
lubricating oil tank; the auxiliary equipment is made unitary, and
this unitary auxiliary equipment, the generator, and the gas
turbine unit are disposed in that order within a building. By means
of this, the installed floor area of the plant is dramatically
reduced, and it is also possible to reduce construction costs.
Furthermore, the unitary auxiliary equipment can be transported
together, so that it is possible to limit all at once the
occurrence of rust in auxiliary equipment resulting from salt
during transport by sea, if a cover is attached, and the packing is
also high-density, so that transportation costs may be reduced.
Furthermore, there are also few installation points, so that the
installation cost is also greatly reduced in scope. In addition,
only a single dedicated crane need be installed to carry out
maintenance, and all maintenance of the auxiliary equipment may be
easily carried out by installing only this single crane.
Inventors: |
Takamatsu, Masaru;
(Takasago-shi, JP) ; Nagai, Hidekazu;
(Takasago-shi, JP) |
Correspondence
Address: |
OBLON SPIVAK MCCLELLAND MAIER & NEUSTADT PC
FOURTH FLOOR
1755 JEFFERSON DAVIS HIGHWAY
ARLINGTON
VA
22202
US
|
Assignee: |
Mitsubishi Heavy Industries,
Ltd.
5-1, Marunouchi 2-chome
Chiyoda-ku
JP
|
Family ID: |
26528091 |
Appl. No.: |
09/984121 |
Filed: |
October 24, 2001 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
09984121 |
Oct 24, 2001 |
|
|
|
09138526 |
Aug 24, 1998 |
|
|
|
Current U.S.
Class: |
60/39.08 |
Current CPC
Class: |
F05D 2230/80 20130101;
F01D 25/28 20130101; F05D 2230/60 20130101; F01D 15/10 20130101;
E04H 5/02 20130101; F02C 7/32 20130101 |
Class at
Publication: |
60/39.08 |
International
Class: |
F02C 007/06 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 25, 1997 |
JP |
9-228170 |
Sep 25, 1997 |
JP |
9-259900 |
Claims
What is claimed is:
1. A gas turbine generator plant provided with: a generator, a gas
turbine unit, and auxiliary equipment comprising a starter, a
lubricating oil device, a control oil device, and a lubricating oil
tank, wherein: said auxiliary equipment is made into a unit, and
said unitary auxiliary equipment, said generator, and said gas
turbine unit are disposed in that order within a building.
2. A gas turbine generator plant in accordance with claim 1,
wherein in said unitary auxiliary equipment, said starter,
lubricating oil device, and control oil device are disposed on said
lubricating oil tank and made unitary.
3. A gas turbine generator plant in accordance with claim 2,
wherein a soundproof cover is provided about said unitary auxiliary
equipment.
4. A gas turbine generator plant in accordance with claim 1,
wherein the roof of said building is such that the roof above said
gas turbine unit is higher than the roof above said unitary
auxiliary equipment and said generator.
5. A gas turbine generator plant in accordance with claim 4,
wherein maintenance cranes are provided within said building at the
side of said gas turbine unit and at the side of said unitary
auxiliary equipment and said generator.
6. A gas turbine generator plant in accordance with claim 4,
wherein a gas turbine suction means is provided on the lower roof
of said building.
7. A gas turbine generator plant in accordance with claim 1,
wherein in a soundproof cover enclosing said gas turbine unit, in
order to reduce the noise generated by said gas turbine unit, a
ventilator within a soundproof cover, for ventilating the interior
of said soundproof cover, limiting temperature increases therein,
and maintaining the interior at an allowed temperature or below, is
provided.
8. A gas turbine generator plant in accordance with claim 7,
wherein said ventilator within a soundproof cover comprises: three
branched ducts, which are coupled at a position separated from said
soundproof cover and which independently exhaust air within said
soundproof cover, fans, interposed in said branched ducts, each
having a capacity capable of exhausting, from within said
soundproof cover, approximately half the air required to maintain
the temperature within said soundproof cover at an allowed
temperature or below; and a ventilation duct, into which said
branched ducts merge and become unitary on the downstream side of
said fans, which is provided in a vertical fashion to a point above
the building in which said gas turbine is disposed, and in which
partitions are vertically provided which form compartments coupled
with, respectively, said branched ducts.
9. A gas turbine generator plant in accordance with claim 8,
wherein the cross-sectional area of said 3 branched ducts is set so
as not to increase the delivery pressure of said fans.
10. A gas turbine generator plant in accordance with claim 8,
wherein a shut off damper is provided on the suction port side of
said fans.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Technical Field
[0002] The present invention relates to a gas turbine generator
plant in which a generator and a gas turbine unit may be disposed
in a unitarymanner within a building by means of making auxiliary
equipment, comprising a starter, a lubricating oil device, a
control oil device, and a lubricating oil main tank into a
unit.
[0003] 2. Related Art
[0004] FIG. 10 is a sketch showing the common arrangement of a
conventional gas turbine generator plant. In the figure, reference
80 indicates a gas turbine unit, while reference 81 indicates a
generator. Reference 91 indicates a lubricating oil main tank,
reference 92 indicates lubricating oil auxiliary equipments
disposed above the lubricating oil main tank 91, reference 93
indicates a starter which serves to start the generator 81, and
reference 94 indicates a speed reducer which is coupled to the
starter 93 and is also coupled to the axle of the generator 81.
Reference 95 indicates a fuel oil control unit, while reference 96
indicates a fuel oil pump. The lubricating oil main tank 91,
lubricating oil auxiliary equipments 92, fuel oil control unit 95,
and fuel oil pump 96 will not be explained in detail; however, the
necessary portions thereof are connected with the gas turbine unit
80, the generator 81, and the starter 93 via wiring and piping
82.
[0005] In the conventional gas turbine generator plant having the
structure described above, the lubricating oil main tank 91, the
lubricating oil auxiliary equipments 92, the starter 93, the speed
reducer 94, the fuel oil control unit 95, and the fuel oil pump 96
all have different purposes of use, so that they occupy different
positions, being disposed in positions appropriate to the use
thereof, and are disposed using the planar space in the vicinity of
gas turbine unit 80 and generator 81.
[0006] During the withdrawal of the rotors of the gas turbine unit
80 or generator 81 disposed in planar space in this manner, or
during the maintenance of the machinery, it is currently the case
that the large parts such as the rotors and the like are
manipulated using large scale overhead cranes, or maintenance
cranes are disposed at each device. In this type of planar
disposition, the floor area of the plant building becomes large,
and as a result, transport, installation, and maintenance become
complex, and this necessarily involves large increases in cost.
[0007] Furthermore, the following problems are result of such a
planar arrangement.
[0008] Since the equipment are arranged in planar fashion, the
floor area required for the installation of the plant is large.
[0009] Because the machines are disposed in an individualized
fashion, transport is time consuming, and installation is also
complex, and this leads to increases in cost.
[0010] Because maintenance cranes are required for each device, the
structure of the building is complex, and there is duplication in
the equipment.
SUMMARY OF THE INVENTION
[0011] The present invention was developed in order to solve the
problems described above; the chief features thereof are that
auxiliary equipment comprising a starter, a lubricating oil device,
a control oil device, and a lubricating oil main tank are disposed
in a compact fashion and made unitary, and this unitary auxiliary
equipment can be coupled with a gas turbine unit and a generator in
a single unit, so that in an arrangement which reduces the floor
area of the building, transport, installation, and maintenance are
all simplified and saved in comparison to the conventional
technology, and a gas turbine generator plant is provided which is
capable of reducing costs.
[0012] The gas turbine generator plant of the present invention is
provided with a generator, a gas turbine unit, and auxiliary
equipment comprising a starter, a lubricating oil device, a control
oil device, and a lubricating oil main tank, and this auxiliary
equipment is made unitary, and the unitary auxiliary equipment, the
generator, and the gas turbine unit are disposed in that order
within a building.
[0013] In the gas turbine generator plant of the present invention,
auxiliary equipment comprising a starter, a lubricating oil device,
a control oil device, and a lubricating oil main tank is made
unitary, so that the floor area required for the plant is greatly
reduced, and it is possible to reduce installation costs.
Furthermore, the unitary auxiliary equipments can be transported
together, so that if a covering is provided, the occurrence of rust
on the auxiliary equipments resulting from exposure to salt during
sea transport may be reduced all at once, and high compact packing
is also possible, so that transport costs may be reduced.
Furthermore, the installation points are also reduced in number, so
that the number of installation man hour or man power is
dramatically reduced. Furthermore, only one dedicated crane need be
provided for maintenance, so that maintenance of all the auxiliary
equipments may be easily carried out by installing a single
crane.
[0014] As described above, by making the auxiliary equipment
unitary, it is possible to dramatically reduce the installed floor
area of the plant. Furthermore, it is possible to transport the
unitary auxiliary equipment together, so that transportation costs
may also be reduced. Furthermore, the installation points are also
reduced in number, so that it is also possible to reduce
installation costs. Additionally, plant maintenance may also be
easily conducted by providing a single dedicated crane.
BRIEF DESCRIPTION OF THE DRAWINGS
[0015] FIG. 1 is a top view showing the entire structure of a gas
turbine generator plant in accordance with an embodiment of the
present invention.
[0016] FIG. 2 is a top view showing the starter/auxiliary equipment
unit in a gas turbine generator plant in accordance with an
embodiment of the present invention.
[0017] FIG. 3 is a side view showing the starter/auxiliary
equipment unit in a gas turbine generator plant in accordance with
an embodiment of the present invention.
[0018] FIG. 4 is a side view showing the details of the structure
of a gas turbine generator plant in accordance with an embodiment
of the present invention.
[0019] FIG. 5 is a side view showing the details of the structure
in the vicinity of the starter/auxiliary equipment unit and
maintenance crane in a gas turbine generator plant in accordance
with an embodiment of the present invention.
[0020] FIG. 6 is a front view showing a ventilation system of the
gas turbine enclosure for the gas turbine generator plant in
accordance with an embodiment of the present invention.
[0021] FIG. 7 is a side view showing the ventilation system of the
gas turbine enclosure for the gas turbine generator plant in
accordance with an embodiment of the present invention.
[0022] FIG. 8 is a front view showing the essential parts of a
ventilation duct of a gas turbine generator plant in accordance
with an embodiment of the present invention.
[0023] FIG. 9 is a cross-sectional view taken along the A-A line in
FIG. 8.
[0024] FIG. 10 is a top view showing the entirety of the structure
of a conventional gas turbine generator plant.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0025] Hereinbelow, preferred embodiments of the present invention
will be concretely explained based on the figures.
[0026] FIG. 1 is a top view showing the entirety of the structure
of a gas turbine generator plant in accordance with an embodiment
of the present invention. In FIG. 1, reference 20 indicates a
starter/auxiliary equipment unit; a starter for starting the gas
turbine and auxiliary equipments 22 comprising various auxiliary
equipments of the lubricating oil system are disposed on the upper
surface of lubricating oil main rank 1. The auxiliary equipments 22
is constructed so as to form a unit with the lubricating oil main
tank 1.
[0027] Reference 23 indicates a building; a small maintenance crane
21 is installed on the ceiling thereof, and the maintenance of
auxiliary equipments 22, the withdrawal of the rotors of generator
81, and the like, are accomplished by means of this crane 21. As
shown in FIG. 4, a intake air system 25 is installed on top of the
building roof 23. Furthermore, reference 24 also indicates a
building, and within this building, generator 81 and gas turbine
unit 80 are disposed so as to be directly connected to one and
other. This building 24 is built so that there is a large amount of
space above the gas turbine unit 80. Additionally, within this
building 24, a large maintenance crane 26 dedicated for the gas
turbine is disposed, and by means of this crane 26, the hoisting of
the gas turbine rotors and the like during maintenance is
accomplished. Reference 50 indicates a foundation.
[0028] FIGS. 2 and 3 show the details of the structure of the
starter/auxiliary equipment unit 20 of the gas turbine generator
plant in accordance with the present embodiment; FIG. 2 shows a top
view thereof, while FIG. 3 shows a side view thereof. In both
figures, starter/auxiliary equipment unit 20 involves a starter for
the gas turbine and auxiliary equipments 22 comprising various
auxiliary equipment of the lubricating oil system such as the
lubricating oil device and the control oil device; this is
installed on the lubricating oil main tank 1, and is made unitary
with the lubricating oil main tank 1, and this unit including the
starter is built so as to be connected with the generator 81.
[0029] Hereinbelow, the features thereof will be discussed in
detail.
[0030] In FIGS. 2 and 3, reference 1 indicates the lubricating oil
main tank, and various devices such as the starter 2, the
lubricating oil device 3, the control oil device 4, a gear device
5, and starting motor 6 are provided on the upper surface of this
tank 1. Furthermore, reference 7 indicates a turning motor,
reference 8 indicates a control oil tank and filter, reference 9
indicates a lubricating oil pumps, reference 10 indicates a
lubricating oil filters, and reference 11 indicates the other
auxiliary equipments. This auxiliary equipment is also provided on
the upper surface of lubricating oil main tank 1, and auxiliary
equipment 2 comprises the main devices described above, from
starter 2 to starting motor 6, and from turning motor 7 to the
other auxiliary equipment 11; this auxiliary equipments 22 is
incorporated on a unitary manner on the upper surface of the
lubricating oil main tank 1 to form the starter/auxiliary equipment
unit 20.
[0031] Reference 15 indicates a soundproofing cover which is
attached on the periphery of the upper surface of the lubricating
oil main tank 1; this is provided particularly in the case in which
starter/auxiliary equipment unit 20 is installed within the
building. In the case of installation outside the building, it is
possible to employ this covering as a weather proof cover by
providing water resistance on the outer surface of the
soundproofing cover 15. In such a case, although of course omitted
in the figures, the ceiling portion is also covered, so that it is
not exposed to the rain.
[0032] As described above, by disposing the auxiliary equipments
22, comprising starter 2--starting motor 6 and turning motor
7--other auxiliary equipment 11, on the upper surface of the
lubricating oil main tank 1, a compact starter/auxiliary equipment
unit 20 is formed, and thereby, it is possible to greatly reduce
the floor area of the plant. Furthermore, it is also possible to
reduce the cost involved in transport and installation, and
maintenance may be accomplished with a single crane, so that it is
possible to greatly reduce the total costs involved in the
construction of the plant, transport, installation, and
maintenance.
[0033] FIG. 4 is a detailed side view of a gas turbine generator
plant in accordance with the present embodiment. In the figure, a
building 23 and building 24 are provided on a foundation 50;
building 23 is lower than building 24, and a intake air system 25,
which conducts air suction of the gas turbine, is provided on the
upper part thereof. Generator 81 and the starter/auxiliary
equipment unit 20, which is depicted in FIGS. 2 and 3 and is
directly connected thereto, is installed within building 23. A
small maintenance crane 21 is installed in the ceiling of the
building 23, and the maintenance of auxiliary equipments 22, and
the withdrawal of the rotors of generator 81, is conducted by means
of this crane 21.
[0034] The roof of building 24 is higher than the roof of building
23, and a large maintenance crane 26 is installed in the ceiling of
this building 24. Gas turbine unit 80 is disposed within this
building 24, and the hoisting and lowering of gas turbine rotor 27
is conducted by means of this large maintenance crane 26.
[0035] As described above, a large maintenance crane 26 and a small
maintenance crane 21 are used in a dedicated fashion, so that it is
possible to use a small lightweight maintenance crane 21 and the
roof of building 23 may be made lower than the roof of building 24,
and a shortening is also possible in the axial direction.
Furthermore, a intake air system 25 is installed on the roof part
of building 23, so that the arrangement is compact, and it is
possible to minimize loads resulting from wind, earthquakes, and
the like.
[0036] FIG. 5 is a side view showing the starter/auxiliary
equipment unit 20 and maintenance crane 21 portions in the present
embodiment; as shown in the figure, the small maintenance crane 21
is disposed in the building 23, and auxiliary equipments 22,
comprising starter 2 and the like, is disposed on the upper surface
of lubricating oil main tank 1 and is made unitary therewith,
producing starter/auxiliary equipment unit 20.
[0037] When the rotors of generator 81 are withdrawn, the cover is
removed using maintenance crane 21, and the upper half of the
lubricating oil equipments on the lubricating oil main tank 1 is
dismantled, and hooks are attached to the rotors of generator 81
using crane 21 from the side of lubricating oil main tank 1, and
these are then moved in the axial direction and draw out.
[0038] As described above, in the gas turbine generator plant of
the present embodiment, auxiliary equipments 22 including a starter
2 is disposed on the upper surface of the lubricating oil main tank
1, forming a starter/auxiliary equipment unit 20, and this
starter/auxiliary equipment unit 20 and a generator 81 are disposed
within a building 23, and furthermore, a dedicated small
maintenance crane 21 is disposed at the ceiling of building 23,
while a intake air system 25 is disposed on the upper part of the
roof thereof. The roof of building 24 is higher than the roof of
building 23 and gas turbine unit 80 is disposed therein, while a
large maintenance crane 26 is installed in the ceiling thereof, and
the plant setup is conducted in the following order:
starter/auxiliary equipment unit 20, generator 81, gas turbine unit
80.
[0039] By conducting the installation in this manner, it is
possible to make the roof of building 23, which houses the
starter/auxiliary equipment unit 20 and generator 81, lower, and by
installing the intake air system 25 on the upper part of the roof
thereof, a shortening in the axial direction is also possible, and
it is also possible to reduce the floor area. Furthermore, the
auxiliary equipments 22 is installed on the upper surface of the
lubricating oil main tank 1 to form the starter/auxiliary equipment
unit 20, so that auxiliary equipments 22 is made unitary, and
transport, installation, and maintenance become simple, so that a
cost reduction is achieved. Furthermore, dedicated cranes are
employed, and thereby, it becomes unnecessary to install
maintenance cranes for each piece of auxiliary equipment or device,
and it is possible to execute all operations relating to
maintenance using the small crane 21 and the large crane 26.
[0040] It is possible to reduce the maintenance crane 21 in size,
so that the crane as a whole may be made small and light. If the
crane can be made light, it is possible to make the crane girder
thin, and to reduce the size of the crane beam. As a result, it is
not merely the case that the crane becomes inexpensive; the motor
capacity is also reduced, so that the power lines and instrument
wiring also are made thinner, and installation thereof becomes a
simple matter.
[0041] Since crane 21 is small and lightweight, it is possible to
lower the roof of building 23. Accordingly, it is possible to
reduce the amount of wall material of building 23, and thus to
achieve a reduction in cost. Furthermore, it is possible to make
the building construction materials thinner by the amount of the
load ratio of crane 21. When the building construction material is
made thinner, the effective space within the building is also
increased. Furthermore, it is also possible to reduce the load with
respect to wind and earthquakes on the intake air filter and
silencer which are provided on the roof thereof.
[0042] Furthermore, by providing the starter 2 on the lubricating
oil main tank 1, it is possible to shorten the axial direction of
building span of the starter 2 side within building 23. A reduction
in the span of the building piller results in a large reduction in
cost of the roof and the building construction material. In other
words, it is possible to make the beams thinner. Furthermore, the
cable trench in the rear of starter 2 is also shortened. This
allows a reduction in the concrete volume, and a shortening of the
cable length. Furthermore, the intake air ducts may also be
shortened, and the weight thereof may be reduced, so that the
design of the building is simplified.
[0043] By means of the gas turbine generator plant of the present
embodiment, the auxiliary equipment is made into a unit, and
thereby the installed floor area of the plant may be dramatically
reduced, and the unitary auxiliary equipment may be transported
together, so that transport costs can also be limited, and there
are few points of installation, so that it is also possible to
reduce installation costs. Furthermore, maintenance may be easily
conducted by installing dedicated cranes.
[0044] Furthermore, the roof of the building housing the gas
turbine unit is made high, and the roof over the generator and the
unitary auxiliary equipment is made low, and thereby, it is
possible to install a large crane and a small crane; the rotors of
the generator may be maintained using the small crane, while the
rotors of the gas turbine may be maintained using the large crane.
For this reason, the building in which the small crane is installed
may be reduced in weight, and it is possible to achieve a cost
savings.
[0045] Furthermore, by providing a intake air system on the lower
roof, it is possible to further reduce the installed floor area of
the plant.
[0046] Furthermore, when the auxiliary equipments is made unitary,
the starter, control device, and lubricating oil device are
provided on the upper surface of the lubricating oil main tank, and
thereby, the density of the unit becomes higher, and this is
effective in reducing the installed floor area and in lowering the
costs of transport, installation, and maintenance.
[0047] FIG. 6 is a front view showing the ventilation system of the
gas turbine enclosure for the gas turbine generator plant described
above, while FIG. 7 is a side view of this ventilation system. The
actual size of this apparatus can be understood from a comparison
with the human being 78 having a height of 180 cm depicted in the
figure.
[0048] In both figures, in order to prevent the external
propagation of the large amount of noise produced by the gas
turbine and containing suction noise, combustion noise, exhaust
noise, and rotational noise and the like, a soundproof cover 61 is
provided so as to enclose the entirety of a casing, not depicted in
the figure, at the outer periphery thereof; this casing contains
rotating blades, rotors, and the like operated by high temperature
combustion gas, and has attached to the inner side thereof a
labyrinth and stationary blades disposed so as to provide a
predetermined gap with the chips of the rotating blades.
[0049] Furthermore, three suction ducts 63 are attached to the top
part of the soundproof cover 61; these form branching ducts, one
end of which communicates with the interior of soundproof cover 61,
the other end communicating with the suction port of fan 62. The
suction ducts 63 exhaust and ventilate the amount of air which must
be exhausted from within the soundproof cover 61 (hereinbelow
referred to as the amount of ventilated air) in order to maintain
the temperature within the soundproof cover 61, the temperature of
which rises as a result of heat radiating from the outer
circumferential surface of the casing, at approximately 60C.
[0050] The three suction ducts 63 which permit the soundproof cover
61 to be coupled with the fan 62, and which send the air within the
soundproof cover 61 to the suction port of fan 62, commonly provide
for the sufficient exhaust of the amount of ventilated air and the
ventilation of the interior of the soundproof cover 61, without
increasing the flow rate, using any two of the three suction ducts
63. Here, even when ventilation of the interior of the soundproof
cover 61 is conducted using any two of the three suction ducts 63,
the ventilation of the entire area within the soundproof cover 61
is conducted approximately uniformly, and a position is selected
such that localized increases in temperature do not occur, and the
ducts are coupled to the top part of soundproof cover 61.
[0051] The cross-sectional area of the three section ducts 63 is
set to a size enabling a flow rate of the exchanged air which, when
50% of the capacity of the amount of ventilated air is caused to
flow, avoids the undesirable effects caused either as a result of
an increase in air resistance and the need for increasing in the
delivery pressure of fan 62 when the flow rate of the ventilated
air increases, or the generation of noise as a result of the air
passing therethrough.
[0052] Furthermore, the fans 62, which are interposed in the
suction ducts 63 coupled to the soundproof cover 61 and which
exhaust the heated air within the soundproof cover 61, have a fan
capacity which is 50% of the amount of ventilated air described
above, and three such fans are disposed in parallel; during
operation, two of these three fans are used in normal operations,
while the other remains in a stand-by condition as a reserve unit
having incorporated thereinto a sequence permitting immediate
operation when a fan malfunctions during operation.
[0053] Furthermore, the delivery pressure of the fans 62 is set at
the extremely low level of approximately 20 mm Aq, and although the
delivery amount is large, the fan capacity is small, and it is thus
possible to reduce running costs.
[0054] In other words, as described above, the cross-sectional area
of the suction ducts 63 is made large, and the cross-sectional area
of the ventilation ducts 65 described hereinbelow is also made
large, and the flow path resistance is reduced, and thereby, the
ventilation of the interior of the soundproof cover 61 can be
sufficiently conducted even when fans 62 having an extremely low
delivery pressure are employed.
[0055] Furthermore, the motors 71 driving fans 62 which are
employed may be ones in which, where necessary, an explosion proof
motor has been used.
[0056] Furthermore, the three exhaust ducts 64 which are disposed
in parallel at the exhaust ports of fans 62 and form a branched
duct in a similar manner, flow together and become one at a
position which is, as may be surmised from the height of the person
78 depicted in the figure, approximately 3 meters higher than the
exhaust ports of the fans 62.
[0057] The ventilation duct 65 formed by the three exhaust ducts 64
is provided in an upright manner along the side wall of building 24
and extending to the roof of building 24, in which gas turbine unit
80 is disposed, in order to comply with regulations concerning the
prevention of explosions.
[0058] Furthermore, as shown in FIGS. 8 and 9, the ventilation duct
65 has, to outward appearances, the rectangular shape of a single
duct; however, it is provided with vertical partitions 67 in its
interior, and the duct is thus divided into three flow paths 72
having a cross-sectional area such that, when an amount of
ventilated air which is 50% of capacity is caused to flow, the flow
rate is such that the flow path resistance does not increase; these
flow paths 72 are coupled with the specific suction ducts 63 and
fans 62.
[0059] In other words, the air exhausted from within the soundproof
cover 61 flows independently, at 50% of the capacity of the amount
of air ventilated, through two of the three flow paths which cover
the entire length from the entrance to the suction duct 63 to the
exit from the ventilation duct 65, and this air is then exhausted
to the exterior. Furthermore, as a method of preventing the
entrance of rain water into the exit part of the ventilation duct
65, the lead end part thereof is formed with a shape bent downward
slightly from the horizontal, as shown in the figure, and a bird
screen or the like is installed, and measures are taken for the
prevention of the entry of foreign objects and for the prevention
of rust, and thus the interior part of ventilation duct 65 is
protected.
[0060] Furthermore, the lead end part of ventilation duct 65 may be
turned freely in any direction in accordance with the
conditions..of the view of the region in which building 24 is
erected.
[0061] The ventilation system 75 of the soundproof cover has a
structure in which a gas turbine engine, soundproof cover 61,
suction ducts 63, fans 62, exhaust ducts 64, ventilation duct 65
and building 24 are connected in a complex manner, so that with
respect to phenomena such as earthquakes, vibration, and uneven
subsidence, and the like, and particularly with respect to uneven
subsidence, it is difficult to estimate which part will subside, so
that provisions are made for making plus/minus adjustments in the
base plate of fans 62.
[0062] As a method for compensating for the incongruities arising
from such phenomena, methods have been considered such as the use
of separation measures in which expansions 68 are provided at the
entry and exit of fans 62, and the installation of shut off
dampers, not depicted in the figure, for use during the operation
of extinguishing devices.
[0063] Furthermore, the provision of shut off dampers on the
suction port side of fans 62 allows 50% of the ventilated air
exhausted from within the soundproof cover 61 described above to
pass independently through each of two flow paths 72 among the
three flow paths 72 existing from the entry of suction ducts 63 to
the exit from ventilation duct 65, and allows this air to be
exhausted to the exterior, and in addition, even during the
operation of the gas turbine, this has the advantage of permitting
the maintenance, inspection, and reconditioning and the like of, in
particular, the fans 62, which have a high trouble frequency.
[0064] A hoist 69 is provided at a height facilitating maintenance
of fans 62, such as the overhaul and inspection there of, and
additionally, and a duct arrangement is considered which forms "the
normal height" installation in commercial gas turbine facilities,
so that a walk-way 70 is provided and regular patrols can be made
from the ground level to the installation points, and thus access
which is not different from that of standard machinery installed
above ground is contemplated. For this reason, general overhaul and
inspection may be conducted on-site, and where further overhaul and
inspection is required, it is possible to convey the machinery to
the ground level.
[0065] In other words, in general, inspection or maintenance of
machinery installed at high positions is conducted by readying a
truck crane each time such an operation becomes necessary, and the
access of standard installations is such that installation costs
are high, so that a provided hoist 69, a walk-way 70, and the like
are generally not provided; however, in the ventilation system
provided of the gas turbine enclosure in the present embodiment,
such hoists and walk-way are extremely important in order to
achieve continuous operation of the gas turbine, and there is not a
feeling of fear at being at a high place during inspection and
maintenance, and operations can be conducted with the feeling that
one is standing on the earth, so that a hoist 69 and a walk-way 70
are provided, and access and good operating characteristics are
provided.
[0066] By means of this ventilation system of the gas turbine
enclosure, the maintenance of one of the fans can be conducted
freely and easily during operation of the gas turbine, and by
conducting a fan actuation operation having a sequence in which a
back up fan is immediately started up when one of the fans fails
down, operation is possible in which 100% of the capacity of the
amount of ventilated air can be guaranteed in all cases.
Accordingly, it is possible to always maintain the interior of the
soundproof cover at or below an acceptable temperature, and it is
thus possible to prevent deformation in the casing. By means of
this, it is possible to completely prevent the occurrence of
problems accompanying casing deformation which make emergency
stoppage of the gas turbine inevitable, and to avoid the occurrence
of serious accidents.
[0067] Furthermore, it is possible to reduce the installed range of
the ducts, and furthermore, in order to prevent the mutual
interactional rotation of the fan exhaust air, it is no longer
necessary to provide check valves, switching dampers, or the like,
at the fan exits, and compactness is thus achieved, and a reduction
in weight and low cost become possible.
[0068] Furthermore, the operation, maintenance, and inspection of
the gas turbine becomes easy, and even during fan failer, recovery
is possible without stopping the gas turbine, and this makes the
continuous operation of the gas turbine possible. Furthermore,
installation is conducted at a high position, so that consideration
is given to operation and safety, and the overall combination is
superior.
[0069] Accordingly, depending on the type of gas turbine,
temperatures may reach 150.degree. C. or above, and it is necessary
to employ various measures to prevent the deformation of the
casing, while at the exhaust end, coolers and the like are
required, while in contrast, in this ventilator of the soundproof
cover, the air within the soundproof cover can be exhausted using a
small fan capacity, and it is easily possible to maintain the
temperature within the soundproof cover at the acceptable
temperature of 60.degree. C. or below.
* * * * *