The present invention relates to a gas-vapor combined cycle concentrated heat supply device and a heat supply method. The gas-vapor combined cycle intensive heat supply includes a gas-vapor combined cycle system, a heating network return water heating system, and a thermal station, wherein the gas-vapor combined cycle system uses a heating network return water heating system to Connected, the gas-vapor combined cycle system comprises a gas turbine, a waste heat boiler, a direct contact type flue gas condensation heat exchanger and a steam turbine, the gas turbine connected with the waste heat boiler, and the waste heat boiler is a direct contact type flue gas Connected with a condensation heat exchanger and a steam turbine, the thermal station includes a hot water type absorption heat pump and a water-water heat exchanger, and the heating network return water heating system includes a steam type absorption heat pump and steam-to recover flue gas waste heat. A water heat exchanger, for recovering flue gas waste heat Different type absorption heat pumps are connected to steam-water heat exchangers, direct contact type flue gas condensation heat exchangers, waste heat boilers, steam turbines and thermal stations respectively, and steam-water heat exchangers are connected to waste heat boilers, steam turbines and thermal stations respectively. do. The present invention can be widely applied to the power plant waste heat recovery industry.
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