F-stage single-shaft fuel gas and steam combined circulation heat system and power generating set economic index system

The invention relates to an F-stage single-shaft fuel gas and steam combined circulation heat system and a power generating set economic index system, and belongs to the technical field of fuel gas and steam combined circulation power generation. The combined circulation heat system comprises a generator, a fuel gas turbine set and a steam turbine set, wherein the fuel gas turbine set and the steam turbine set are connected with the generator; the fuel gas turbine set comprises a fuel gas compressor, a combustion chamber and a fuel gas turbine which communicate in sequence; the steam turbine set comprises a waste heat boiler, a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder; and the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder are connected wit the waste heat boiler. The invention further provides the combined circulation power generating set economic index system. The F-stage single-shaft fuel gas and steam combined circulation heat system