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A gas-turbine power generating installation capable of effectively utilizing gases produced in overage gas fields, etc. and a method of operating the installation are provided. The gas-turbine power generating installation is installed in the vicinity of an outrage gas field or an oil field. In the

A gas-turbine power generating installation capable of effectively utilizing gases produced in overage gas fields, etc. and a method of operating the installation are provided. The gas-turbine power generating installation is installed in the vicinity of an outrage gas field or an oil field. In the installation, air compressed by a compressor is introduced to a combustor for combustion after being mixed with fuel, a gas turbine is driven by generated combustion gas, and a power generator is driven by motive power obtained from a rotary shaft of the gas turbine. A boosting compressor is driven by the motive power obtained from the rotary shaft of the gas turbine, whereby natural gas or accompanying gas is boosted in pressure and supplied as fuel to the combustor. The gas turbine generates electric power by using natural gas produced in the outrage gas field or accompanying gas produced in the oil field, and the generated electric power is supplied to a consuming site.

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What is claimed is: 1. A gas-turbine power generating installation including a gas turbine installed in the vicinity of an overage gas field or an oil field and generating electric power with said gas turbine by using natural gas produced in the overage gas field or accompanying gas produced in the

What is claimed is: 1. A gas-turbine power generating installation including a gas turbine installed in the vicinity of an overage gas field or an oil field and generating electric power with said gas turbine by using natural gas produced in the overage gas field or accompanying gas produced in the oil field, the generated electric power being supplied to a consuming site, wherein said gas turbine is a gas turbine in which air compressed by a compressor is introduced to a combustor for combustion after being mixed with fuel, a turbine is driven by generated combustion gas, and a power generator is driven by motive power obtained from a rotary shaft of said gas turbine, said installation further includes a boosting compressor driven by the motive power obtained from the rotary shaft of said gas turbine, and the natural gas or the accompanying gas is boosted in pressure by said boosting compressor and supplied as fuel to said combustor, wherein said power generator is driven by the rotary shaft of said gas turbine through a speed reducing gear, and said boosting compressor is driven by the rotary shaft of said gas turbine through a speed increasing gear. 2. A gas-turbine power generating installation according to claim 1, wherein said speed reducing gear and said speed increasing gear receiving the motive power from the shaft of said gas turbine on the compressor side. 3. A gas-turbine power generating installation including a gas turbine installed in the vicinity of an overage gas field or an oil field and generating electric power with said gas turbine by using natural gas produced in the overage gas field or accompanying gas produced in the oil field, the generated electric power being supplied to a consuming site, wherein said gas turbine is a gas turbine in which air compressed by a compressor is introduced to a combustor for combustion after being mixed with fuel, a turbine is driven by generated combustion gas, and a power generator is driven by motive power obtained from a rotary shaft of said gas turbine, said installation further includes a boosting compressor driven by the motive power obtained from the rotary shaft of said gas turbine, and the natural gas or the accompanying gas is boosted in pressure by said boosting compressor and supplied as fuel to said combustor, said gas-turbine power generating installation further including: a fuel flow adjusting valve disposed in a line extending from an outlet of said boosting compressor to said combustor in said gas turbine; a tank; a line connecting an intermediate point between the outlet of said boosting compressor and said fuel flow adjusting valve to said tank; and an on/off valve disposed in the line connected to said tank. 4. A gas-turbine power generating installation including a gas turbine installed in the vicinity of an overage gas field or an oil field and generating electric power with said gas turbine by using natural gas produced in the overage gas field or accompanying gas produced in the oil field, the generated electric power being supplied to a consuming site, wherein said gas turbine is a gas turbine in which air compressed by a compressor is introduced to a combustor for combustion after being mixed with fuel, a turbine is driven by generated combustion gas, and a power generator is driven by motive power obtained from a rotary shaft of said gas turbine, said installation further includes a boosting compressor driven by the motive power obtained from the rotary shaft of said gas turbine, and the natural gas or the accompanying gas is boosted in pressure by said boosting compressor and supplied as fuel to said combustor, said gas-turbine power generating installation further including: an air line extending from an outlet or an intermediate position of said compressor in said gas turbine to an inlet of said boosting compressor; an air supply valve disposed in said air line; and a switching valve disposed on the inlet side of said boosting compressor upstream of a joint position of said air line. 5. A gas-turbine power generating installation including a gas turbine installed in the vicinity of an overage gas field or an oil field and generating electric power with said gas turbine by using natural gas produced in the overage gas field or accompanying gas produced in the oil field, the generated electric power being supplied to a consuming site, wherein said gas turbine is a gas turbine in which air compressed by a compressor is introduced to a combustor for combustion after being mixed with fuel, a turbine is driven by generated combustion gas, and a power generator is driven by motive power obtained from a rotary shaft of said gas turbine, said installation further includes a boosting compressor driven by the motive power obtained from the rotary shaft of said gas turbine, and the natural gas or the accompanying gas is boosted in pressure by said boosting compressor and supplied as fuel to said combustor, said gas-turbine power generating installation further including: a bypass line connecting an inlet and an outlet of said boosting compressor in said gas turbine; a startup fuel gas supply valve disposed in said bypass line; and pressure gauges for measuring an inlet pressure and an outlet pressure of said boosting compressor. 6. A gas-turbine power generating installation including a gas turbine installed in the vicinity of an overage gas field or an oil field and generating electric power with said gas turbine by using natural gas produced in the overage gas field or accompanying gas produced in the oil field, the generated electric power being supplied to a consuming site, wherein said gas turbine is a gas turbine in which air compressed by a compressor is introduced to a combustor for combustion after being mixed with fuel, a turbine is driven by generated combustion gas, and a power generator is driven by motive power obtained from a rotary shaft of said gas turbine, said installation further includes a boosting compressor driven by the motive power obtained from the rotary shaft of said gas turbine, and the natural gas or the accompanying gas is boosted in pressure by said boosting compressor and supplied as fuel to said combustor, said gas-turbine power generating installation further including: a bypass line connecting an inlet and an outlet of said boosting compressor in said gas turbine; a startup fuel gas supply valve disposed in said bypass line; and a tachometer for detecting a rotation speed of a shaft of said boosting compressor, said turbine or said power generator. 7. A gas-turbine power generating installation including a gas turbine installed in the vicinity of an overage gas field or an oil field and generating electric power with said gas turbine by using natural gas produced in the overage gas field or accompanying gas produced in the oil field, the generated electric power being supplied to a consuming site, wherein said gas turbine is a gas turbine in which air compressed by a compressor is introduced to a combustor for combustion after being mixed with fuel, a turbine is driven by generated combustion gas, and a power generator is driven by motive power obtained from a rotary shaft of said gas turbine, said installation further includes a boosting compressor driven by the motive power obtained from the rotary shaft of said gas turbine, and the natural gas or the accompanying gas is boosted in pressure by said boosting compressor and supplied as fuel to said combustor, said gas-turbine power generating installation further including: a bypass line connecting an inlet and an outlet of said boosting compressor in said gas turbine; and a startup fuel gas boosting compressor and a startup fuel gas supply valve both disposed in said bypass line. 8. A gas-turbine power generating installation including a gas turbine installed in the vicinity of an overage gas field or an oil field and generating electric power with said gas turbine by using natural gas produced in the overage gas field or accompanying gas produced in the oil field, the generated electric power being supplied to a consuming site, wherein said gas turbine is a gas turbine in which air compressed by a compressor is introduced to a combustor for combustion after being mixed with fuel, a turbine is driven by generated combustion gas, and a power generator is driven by motive power obtained from a rotary shaft of said gas turbine, said installation further includes a boosting compressor driven by the motive power obtained from the rotary shaft of said gas turbine, and the natural gas or the accompanying gas is boosted in pressure by said boosting compressor and supplied as fuel to said combustor, said gas-turbine power generating installation further including: an anti-surge line extending to an inlet of said boosting compressor from an intermediate point of a line extending from an outlet of said boosting compressor to said combustor in said gas turbine; and an anti-surge valve disposed in said anti-surge line.