Power plants – Combustion products used as motive fluid – Combined with regulation of power output feature
Reexamination Certificate
2000-01-05
2002-05-21
Casaregola, Louis J. (Department: 3746)
Power plants
Combustion products used as motive fluid
Combined with regulation of power output feature
C060S039530, C060S039511, C060S728000
Reexamination Certificate
active
06389799
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a gas turbine, and particularly to a high moisture gas turbine cycle using high moisture air for combustion.
BACKGROUND ART
High moisture gas turbine cycles have been disclosed, for example, in Japanese Patent Laid-open Nos. Sho 57-79224, Sho 57-79225, and Sho 58-101228, and U.S. Pat. No. 4,448,018, in which thermal energy of gas turbine combustion exhaust gas or the like is recovered to produce water vapor; the water vapor is mixed in combustion air for the gas turbine; and a turbine is driven by high moisture combustion exhaust gas obtained by a combustor, whereby the output power and the power generating efficiency are enhanced.
A configuration of one of the above high moisture gas turbine cycles has been disclosed, in which a low pressure compressor and a high pressure compressor are arranged in series, and a direct or indirect heat exchanger is interposed between both the compressors, wherein heat recover is performed by injecting water to compressed air emerged from the high pressure compressor.
DISCLOSURE OF INVENTION
In each known example, however, it is required to inject a large amount of water to compressed air to be supplied to a combustor for obtaining a desired output power or a desired power generating efficiency.
When air containing large amount of water is supplied to the combustor, the combustion stability of the combustor becomes low. In particular, for a power generating gas turbine, premixed combustion of air and fuel in a narrow stable combustion range, which is performed for reducing the amount of Nox of exhaust gas, is largely affected by the supply of air including a large amount of water.
Accordingly, the present invention provides a high moisture gas turbine installation capable of enhancing combustion stability while ensuring desired output power and power generating efficiency.
The present invention also provides a high moisture gas turbine installation capable of enhancing combustion stability while ensuring desired output power and power generating efficiency by reducing the amount of water required to obtain the desired output power and power generating efficiency.
The Present invention also provides a high moisture gas turbine capable of miniaturizing a humidifier, an apparatus for recovering water from gas turbine exhaust gas, and the like by reducing the amount of supplied water, and further increasing the output power and power generating efficiency by reducing loss in compressed air and exhaust gas.
In a high moisture gas turbine cycle, a large amount of moisture is added to air for combustion. In this case, if moisture is partially added to air supplied from atmospheric air, a humidifier can be miniaturized and a heat exchanger for supplying hot water to the humidifier can be also miniaturized as compared with the method in which moisture is added to compressed air.
As a result, a pressure loss in equipment connected between a gas turbine and air compressors such as the humidifier and heat exchanger is reduced, and thereby the power generating efficiency of the gas turbine can be improved. Also, the power of the air compressor can be reduced even if the air compressor is not divided or a plurality of the air compressors are not arranged in series, and thereby the output power and the power generating efficiency of the gas turbine can be improved.
To be more specific, the present invention provides a gas turbine installation including a compressor for compressing air supplied thereto and discharging the compressed air, a combustor for burning fuel together with the air discharged from the compressor, and a turbine driven by combustion gas generated by the combustor, the gas turbine installation comprising:
a spraying apparatus, which is provided in an air suction chamber disposed on the upstream side of the compressor, and which is used for spraying water droplets to air to be supplied to the compressor thereby making the temperature of the air to be supplied to the compressor lower than the temperature of atmospheric air, the sprayed water droplets being introduced in the compressor together with the air whose temperature has been lowered and being evaporated in a period in which the water droplets flow down in the compressor together with the air;
a water adding apparatus for adding water to the compressed air discharged from the compressor, the compressed air containing moisture added in the form of water droplets by the spraying apparatus;
a regenerator for receiving the compressed air containing moisture added by the water adding apparatus and heating the compressed air by using a gas turbine exhaust gas as a heat source; and
a path through which the compressed air heated by the regenerator is supplied to the combustor.
For a gas turbine system in which the spraying apparatus
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is simply provided to the compressor, since the compression work is reduced, the effect of increasing the output power becomes large; however, since the temperature of the air at the outlet of the compressor is lowered, that is, the temperature of the air to e supplied to the compressor is lowered, the used amount of fuel at the combustor becomes large, so that it is not expect to increase the power generating efficiency.
The present invention also provides a gas turbine installation including a compressor for compressing air supplied thereto and discharging the compressed air, a combustor for burning fuel together with the air discharged from the compressor, and a turbine driven by combustion gas generated by the combustor, the gas turbine installation comprising:
a spraying apparatus, which is provided in an air suction chamber disposed on the upstream side of the compressor, and which is used for spraying water droplets to air to be supplied to the compressor, evaporating part of the sprayed water droplets until the water droplets are led in the compressor, and evaporating the non-evaporated water droplets led in the compressor together with the air in a period in which the water droplets flow down in the compressor together with the air;
a water adding apparatus for adding water to the compressed air discharged from the compressor, the compressed air containing moisture added in the form of water droplets by the spraying apparatus;
a regenerator for receiving the compressed air containing moisture added by the water adding apparatus and heating the compressed air by using a gas turbine exhaust gas as a heat source; and
a path through which the compressed air heated by the regenerator is supplied to the combustor.
The present invention also provides a gas turbine installation including a compressor for compressing air supplied thereto and discharging the compressed air, a combustor for burning fuel together with the air discharged from the compressor, and a turbine driven by combustion gas generated by the combustor, the gas turbine installation comprising:
a spraying apparatus, which is provided in an air suction chamber disposed on the upstream side of the compressor, and which is used for spraying water droplets to air to be supplied to the compressor, evaporating part of the sprayed water droplets until the water droplets are led in the compressor, and evaporating the non-evaporated water droplets led in the compressor together with the air in a period in which the water droplets flow down in the compressor together with the air;
a water adding apparatus for adding water to the compressed air discharged from the compressor, the compressed air containing moisture added in the form of water droplets by the spraying apparatus;
a regenerator for receiving the compressed air containing moisture added by the water adding apparatus and heating the compressed air by using a gas turbine exhaust gas as a heat source;
a path through which the compressed air heated by the regenerator is supplied to the combustor; and
a path used for recovering moisture from combustion exhaust gas having passed through the regenerator and supplying the recovered moisture to at least one of the spraying apparatus and the water adding
Hatamiya Shigeo
Noguchi Yoshiki
Tsukamoto Moriaki
Yamagishi Masahiko
Yokomizo Osamu
Casaregola Louis J.
Mattingly Stanger & Malur, P.C.
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