Power plants – Combustion products used as motive fluid – Multiple fluid-operated motors
Reexamination Certificate
1999-02-24
2001-04-10
Nguyen, Hoang (Department: 3748)
Power plants
Combustion products used as motive fluid
Multiple fluid-operated motors
C060S728000
Reexamination Certificate
active
06212873
ABSTRACT:
BACKGROUND OF TIE INVENTION
1. Field of the Invention
The invention relates to a gas turbine combined cycle or power plant which drives a gas turbine by a combustion gas obtained by blowing a fuel into high pressure air and burning the fuel so as to generate power in the gas turbine. A steam turbine is driven by steam that is generated by recovering heat from an exhaust gas that drives the gas turbine, so as to generate power in the steam turbine. This improves heat efficiency. The gas turbine combined cycle cools compression air discharged from a low pressure compressor before being made into high pressure air by a high pressure compressor, so as to make a drive force of the high pressure compressor driven by the gas turbine small. Heat energy recovered by the cooling is used for driving the steam turbine, thereby further improving the heat efficiency.
2. Description of the Related Art
There has been a conventional gas turbine combined cycled or power plant which drives a gas turbine by a combustion gas obtained by burning high pressure air and a fuel and drives a steam turbine by steam generated by an exhaust gas discharged from the gas turbine.
This gas turbine combined cycle is structured such that the gas turbine, driven by the combustion gas, outputs the drive force for operating a power generator or the like and drives the compressor for generating the combustion gas having a high temperature and a high pressure. The compressor driven by the gas turbine is provided with a low pressure compressor and a high pressure compressor, and compresses introduced ambient air in two steps so as to make high pressure air, and then supplies the air to a combustion device into which fuel is blown so as to generate combustion gas.
That is, the high pressure compressor is structured so as to suck a high temperature compression air, compressed in the low pressure compressor in an adiabatic manner and reaching a temperature of 190° C. or more, and further increase the pressure of the compression air to high pressure air, and then supply the air to the combustion device.
Accordingly, the drive force of the high pressure compressor is increased and much of the drive force generated in the gas turbine is consumed, so that the drive force which the gas turbine can output is reduced. Accordingly, this causes a reduction of efficiency of the gas turbine combined cycle or power plant.
Therefore, there has been employed an intermediate cooling type gas turbine combined cycle or power plant (hereinafter referred to as an intermediate cooling type combined gas turbine cycle or power plant) which is structured so as to cool a high temperature compression air discharged from the low pressure compressor in an intermediate cooling device, and supply the compression air cooled to about 100° C. to a high pressure compressor so as to increase the pressure to of the air to a high pressure. This makes the drive force supplied from the gas turbine for driving the high pressure compressor small so as to improve the magnitude of the drive force supplied by the gas turbine.
FIG. 3
is a systematic view which shows an intermediate cooling type gas turbine combined cycle in accordance with the conventional art.
As shown in the drawing, an intermediate cooling type gas turbine combined cycle or power plant
30
is constituted by a gas turbine portion
10
comprising a power generator
1
, a low pressure compressor
2
, a high pressure compressor
3
, a combustion device
4
(combustor), a gas turbine
5
, a rotor cooling cooler
6
, cooling towers
7
and
9
, and an intermediate cooling device
8
. The cooling type gas turbine combined cycle
30
also includes an exhaust gas heat recovery portion
23
comprising a high pressure steam generating device
11
, an intermediate steam generating device
12
, a low pressure steam generating device
13
, a high pressure steam pipe
14
, an intermediate pressure steam pipe
15
, a low pressure steam pipe
16
, a power generator
17
, a high pressure steam turbine
18
, an intermediate pressure steam turbine
19
, a low pressure steam turbine
20
, a reheater
21
and a condenser
22
.
The high pressure compressor
3
, the low pressure compressor
2
and the power generator
1
are coaxially connected to the gas turbine
5
of the gas turbine portion
10
, and as mentioned below, the gas turbine
5
is structured so as to drive the compressors via combustion gas so as to transform ambient air A into a predetermined high pressure air for performing a combustion such that power is generated.
At first, the ambient air A is sucked by an intake port of the low pressure compressor
2
driven by the gas turbine
5
, compressed in an adiabatic manner and increased to a predetermined low pressure, and then discharged from a discharge port of the low pressure compressor
2
as a high temperature compression air having a temperature equal to or more than 190° C.
When introducing this compression air having a high temperature into the high pressure compressor
3
, the drive force of the high pressure compressor
3
required for increasing the pressure of the air is increased, whereby the drive force supplied from the gas turbine
5
for driving the high pressure compressor
3
is also increased such that the drive force for driving the generator
1
is reduced. Thus, the intermediate cooling device
8
having the cooling tower
9
is provided between the discharge port of the low pressure compressor
2
and the suction port of the high pressure compressor
3
so as to cool the compression air discharged from the low pressure compressor
2
to about 100° C. before being introduced into the high pressure compressor
3
.
The high pressure air increased by the high pressure compressor
3
is introduced into the combustion device
4
, and mixed with a fuel F introduced to the combustion device
4
, which is burned so as to produce a combustion gas having a high temperature and a high pressure, whereby the gas turbine
5
is driven in the manner mentioned above.
Further, a part of the high pressure air that is discharged from the high pressure compressor
3
, or a high pressure air extracted from a middle step of the high pressure compressor
3
(hereinafter referred to as extracted steam), is cooled to about 200° C. by the rotor cooling cooler
6
and supplied to an inner portion of a rotor blade or a stator blade of the gas turbine
5
that is exposed to the high temperature combustion gas passing within the rotor of the gas turbine
5
, thereby cooling the rotor blade or the stator blade from an inner portion thereof.
Still further, the high temperature exhaust gas driving the gas turbine
5
, and discharged from the gas turbine
5
, is discharged to the ambient air from the chimney
24
via the discharged heat recovery portion
23
.
Next, in the exhaust gas heat recovery portion
23
, a recovery of the heat from the exhaust gas is performed by successively passing the exhaust gas from the gas turbine
5
through inner portions of the high pressure steam generating device
11
, the intermediate pressure steam generating device
12
and the low pressure steam generating device
13
, which are arranged in the discharged heat recovery portion
23
so as to respectively generate steam having a high pressure, an intermediate pressure and a low pressure. The steam having the respective pressures is fed to the high pressure steam turbine
18
, the intermediate pressure steam turbine
19
and the low pressure steam turbine
20
, which are coaxially connected respectively by the high pressure steam pipe
14
, the intermediate pressure steam pipe
15
and the low pressure steam pipe
16
. The steam expands within the turbines
18
,
19
and
20
so as to rotate the respective steam turbines, drive the power generator
17
coaxially connected to the steam turbines, and generate electric energy.
Further, at an outlet of the high pressure steam turbine
18
the exhaust gas driving the high pressure steam turbine
18
is mixed with the intermediate pressure steam generated in the intermediate pressur
Akita Eiji
Mori Hidetaka
Sugishita Hideaki
Tsukuda Yoshiaki
Uematsu Kazuo
Mitsubishi Heavy Industries Ltd.
Nguyen Hoang
Wenderoth , Lind & Ponack, L.L.P.
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