A gas turbine apparatus has an air compressor for compressing air, a combustor capable of combusting the compressed air, a turbine rotatable by a gas discharged from the combustor, and a recuperator for exchanging heat between the air supplied from the air compressor and an exhaust gas discharged fr
A gas turbine apparatus has an air compressor for compressing air, a combustor capable of combusting the compressed air, a turbine rotatable by a gas discharged from the combustor, and a recuperator for exchanging heat between the air supplied from the air compressor and an exhaust gas discharged from the turbine. The gas turbine apparatus includes a fuel supply system having a first fuel supply device for supplying a fuel having a large heating value to the combustor, a second fuel supply device for supplying a gas having a small heating value to the combustor, and a switching device operable to switch the first fuel supply device and the second fuel supply device based on a temperature of the air compressed by the air compressor or the exhaust gas discharged from the turbine.
대표청구항▼
What is claimed is: 1. A gas turbine apparatus comprising: an air compressor for compressing air; a combustor capable of combusting the air compressed by said air compressor; a turbine rotatable by a gas discharged from said combustor; a recuperator for exchanging heat between the air supplied from
What is claimed is: 1. A gas turbine apparatus comprising: an air compressor for compressing air; a combustor capable of combusting the air compressed by said air compressor; a turbine rotatable by a gas discharged from said combustor; a recuperator for exchanging heat between the air supplied from said air compressor to said combustor and an exhaust gas discharged from said turbine; a first fuel supply device operable to supply a fuel having a large heating value to said combustor; a second fuel supply device operable to supply a gas having a lower heating value smaller than the fuel to said combustor; and a switching device operable to switch a fuel to be supplied to said combustor from the fuel having a large heating value to the gas having a lower heating value by switching said first fuel supply device and said second fuel supply device, wherein a switching operation of said switching device is performed when it is determined that said recuperator is heated to a predetermined temperature based on a temperature of the air compressed by said air compressor or the exhaust gas discharged from said turbine. 2. The gas turbine apparatus as recited in claim 1, further comprising a first temperature measuring device for measuring a temperature of the exhaust gas downstream of said recuperator, wherein said switching device is configured to switch said first fuel supply device and said second fuel supply device when the temperature measured by said first temperature measuring device exceeds a predetermined value. 3. The gas turbine apparatus as recited in claim 1, further comprising a second temperature measuring device for measuring a temperature of the air upstream of said combustor and downstream of said recuperator, wherein said switching device is configured to switch said first fuel supply device and said second fuel supply device when the temperature measured by said second temperature measuring device exceeds a predetermined value. 4. The gas turbine apparatus as recited in claim 1, further comprising a third temperature measuring device for measuring a temperature of the exhaust gas discharged from said turbine, wherein said switching device is configured to switch said first fuel supply device and said second fuel supply device when the temperature measured by said third temperature measuring device exceeds a predetermined value. 5. The gas turbine apparatus as recited in claim 1, further comprising at least one fuel compressor for pressurizing the fuel at a downstream side of said switching device. 6. The gas turbine apparatus as recited in claim 5, further comprising a controller operable to control an amount of discharge from said at least one fuel compressor. 7. The gas turbine apparatus as recited in claim 5, wherein said at least one fuel compressors comprises a plurality of fuel compressors. 8. The gas turbine apparatus as recited in claim 7, further comprising a controller operable to control a number of said plurality of fuel compressors being operated. 9. The gas turbine apparatus as recited in claim 1, further comprising at least one fuel compressor for pressurizing the gas at an upstream side of said switching device. 10. The gas turbine apparatus as recited in claim 9, further comprising: a supply source holding the fuel at a pressure higher than a pressure of the gas to be pressurized by said at least one fuel compressor; and a pressure reducing valve for reducing the pressure of the fuel in said supply source and supplying to said switching device. 11. The gas turbine apparatus as recited in claim 9, further comprising a controller operable to control an amount of discharge from said at least one fuel compressor. 12. The gas turbine apparatus as recited in claim 9, wherein said at least one fuel compressors comprises a plurality of fuel compressors. 13. The gas turbine apparatus as recited in claim 12, further comprising a controller operable to control a number of said plurality of fuel compressors being operated. 14. The gas turbine apparatus as recited in claim 1, wherein said switching device comprises a three-way mixing valve operable to gradually mix the fuel and the gas and switch the fuel and the gas. 15. The gas turbine apparatus as recited in claim 1, wherein said switching device comprises a three-way selector valve operable to instantaneously switch the fuel and the gas. 16. The gas turbine apparatus as recited in claim 1, wherein the gas comprises at least one of a digestion gas produced in a digestion process of biomass and a pyrolysis gas produced in a gasification process of biomass. 17. The gas turbine apparatus as recited in claim 1, wherein the fuel comprises at least one of a natural gas, a liquefied petroleum gas, a propane gas, kerosene, and light oil. 18. A gas turbine apparatus comprising: an air compressor for compressing air; a combustor capable of combusting the air compressed by said air compressor, said combustor including a fuel manifold; a turbine rotatable by a gas discharged from said combustor; a recuperator for exchanging heat between the air supplied from said air compressor to said combustor and an exhaust gas discharged from said turbine; a first fuel supply device operable to supply a fuel having a large heating value to said combustor; a second fuel supply device operable to supply a gas having a lower heating value smaller than the fuel to said combustor; and a fuel controller operable to adjust amounts of the fuel and the gas to be supplied, wherein said fuel controller is configured to switch a fuel to be supplied to said combustor from the fuel having a large heating value to the gas having a lower heating value when it is determined that said recuperator is heated to a predetermined temperature based on the temperature of the air compressed by said air compressor or the exhaust gas discharged from the turbine, and wherein said first fuel supply device and said second fuel supply device are coupled separately to said fuel manifold of said combustor. 19. The gas turbine apparatus as recited in claim 18, wherein the gas comprises at least one of a digestion gas produced in a digestion process of biomass and a pyrolysis gas produced in a gasification process of biomass. 20. The gas turbine apparatus as recited in claim 18, wherein the fuel comprises at least one of a natural gas, a liquefied petroleum gas, a propane gas, kerosene, and light oil. 21. A gas turbine power generating system comprising: a gas turbine apparatus including: an air compressor for compressing air, a combustor capable of combusting the air compressed by said air compressor, a turbine rotatable by a gas discharged from said combustor, a recuperator for exchanging heat between the air supplied from said air compressor to said combustor and an exhaust gas discharged from said turbine, a first fuel supply device operable to supply a fuel having a large heating value to said combustor, a second fuel supply device operable to supply a gas having a lower heating value smaller than the fuel to said combustor, and a switching device operable to switch a fuel to be supplied to said combustor from the fuel having a large heating value to the gas having a lower heating value by switching said first fuel supply device and said second fuel supply device, wherein a switching operation of said switching device is performed when it is determined that said recuperator is heated to a predetermined temperature based on a temperature of the air compressed by said air compressor or the exhaust gas discharged from said turbine; and a power generating apparatus for generating electric power with use of high-speed rotation of said turbine in said gas turbine apparatus. 22. The gas turbine power generating system as recited in claim 21, wherein said power generating apparatus comprises: a permanent magnet power generator coupled to said turbine in said gas turbine apparatus; a converter for converting a high-frequency AC output of said permanent magnet power generator into a DC output; and an inverter for converting the DC output into an AC output having a predetermined frequency and a predetermined voltage and outputting the AC output. 23. A gas turbine power generating system comprising: a gas turbine apparatus including: an air compressor for compressing air, a combustor capable of combusting the air compressed by said air compressor, said combustor including a fuel manifold, a turbine rotatable by a gas discharged from said combustor, a recuperator for exchanging heat between the air supplied from said air compressor to said combustor and an exhaust gas discharged from said turbine, a first fuel supply device operable to supply a fuel having a large heating value to said combustor, a second fuel supply device operable to supply a gas having a lower heating value smaller than the fuel to said combustor, and a fuel controller operable to adjust amounts of the fuel and the gas to be supplied, wherein said fuel controller is configured to switch a fuel to be supplied to said combustor from the fuel having a large heating value to the gas having a lower heating value when it is determined that said recuperator is heated to a predetermined temperature based on the temperature of the air compressed by said air compressor or the exhaust gas discharged from the turbine, and wherein said first fuel supply device and said second fuel supply device are coupled separately to said fuel manifold of said combustor; and a power generating apparatus for generating electric power with use of high-speed rotation of said turbine in said gas turbine apparatus. 24. The gas turbine power generating system as recited in claim 23, wherein said power generating apparatus comprises: a permanent magnet power generator coupled to said turbine in said gas turbine apparatus; a converter for converting a high-frequency AC output of said permanent magnet power generator into a DC output; and an inverter for converting the DC output into an AC output having a predetermined frequency and a predetermined voltage and outputting the AC output.
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