Patent ID: 11905855
Assignee: DOOSAN ENERBILITY CO., LTD.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  C  Y | IPC F

Claim 8:
9. A method of driving a combined power generation system comprising a gas turbine, a steam turbine, a heat recovery steam generator (HRSG), and an ammonia decomposer configured to decompose ammonia and supply ammonia-decomposed gases to a combustor of a gas turbine, the method comprising:
an exhaust gas supply step of supplying exhaust gases generated in the gas turbine to the ammonia decomposer and the HRSG;
an ammonia decomposition step of decomposing ammonia using heat of the exhaust gases supplied from the gas turbine to generate the ammonia-decomposed gases;
a decomposed gas supply step of supplying the decomposed gases generated in the ammonia decomposition step to the combustor; and
a combustion and power generation step of combusting the decomposed gases in the combustor to generate exhaust gases to allow a generator to rotate,
wherein:
the low-pressure section comprises a condensate preheater configured to heat condensate, and a low-pressure evaporator configured to heat feedwater and convert the feedwater into steam,
in the exhaust gas supply step, after heat exchange between the exhaust gases discharged from the gas turbine and the exhaust gases discharged from the ammonia decomposer in a heat exchanger, the exhaust gases discharged from the gas turbine are transferred to the ammonia decomposer, and the exhaust gases discharged from the ammonia decomposer are transferred to the HRSG; and
in the ammonia decomposition step, the exhaust gases are transferred upstream of the low-pressure evaporator with respect to a flow direction of the exhaust gases and the exhaust gases having been used in the ammonia decomposition are transferred to a low pressure section of the HRSG.