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A hydrogen-combustion gas turbine plant includes a first system for using inert gas as a working fluid, and a second system for using steam as a working fluid. The first system includes a compressor on a turbine shaft, a first heat exchanger, and a second heat exchanger. The first heat exchanger hea

A hydrogen-combustion gas turbine plant includes a first system for using inert gas as a working fluid, and a second system for using steam as a working fluid. The first system includes a compressor on a turbine shaft, a first heat exchanger, and a second heat exchanger. The first heat exchanger heats gas compressed by the compressor and supplies the compressed gas to a high pressure intake of a second turbine. The second heat exchanger cools gas exhausted from the second turbine and supplies the cooled gas to a low pressure intake of the compressor. The second system includes the first heat exchanger and the second heat exchanger. The first heat exchanger uses heat generated by combustion of a gas mixture including hydrogen and oxygen to heat the inert gas, and supplies steam resulting from the combustion to a high pressure intake of a first turbine. The second heat exchanger uses heat from the inert gas of the first system to heat steam exhausted from a low temperature outlet of the first turbine, and passes the heated steam to a third turbine.

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A hydrogen-combustion gas turbine plant including an electrical power generator having a rotor shaft, a first turbine on a turbine shaft coupled to the rotor shaft, a second turbine on said turbine shaft, a third turbine on said turbine shaft, and a condenser connected to an outlet of said third tur

A hydrogen-combustion gas turbine plant including an electrical power generator having a rotor shaft, a first turbine on a turbine shaft coupled to the rotor shaft, a second turbine on said turbine shaft, a third turbine on said turbine shaft, and a condenser connected to an outlet of said third turbine, said third turbine outputting steam and said condenser condensing the steam output from said third turbine, said plant comprising: (a) a first system for using inert gas as a working fluid, the first system including a compressor on said turbine shaft, a first heat exchanger, and a second heat exchanger, the first heat exchanger heating gas compressed by said compressor and supplying said compressed gas to a high pressure intake of said second turbine, the second heat exchanger cooling gas exhausted from said second turbine and supplying the cooled gas to a low pressure intake of said compressor; and (b) a second system for using steam as a working fluid, the second system including said first heat exchanger and said second heat exchanger, said first heat exchanger using heat generated by combustion of a gas mixture including hydrogen and oxygen to heat said inert gas, said first heat exchanger supplying steam resulting from the combustion to a high pressure intake of said first turbine, said second heat exchanger using heat from said inert gas of said first system to heat steam exhausted from a low temperature outlet of said first turbine, said second heat exchanger passing the heated steam to said third turbine.