Repowering steam plant through addition of gas turbine and method for remodelling plant facilities

摘要

A repowering steam plant through the addition of a gas turbine, and a method for remodeling the plant facilities. This repowering steam plant is constructed by, to existing steam turbine facilities (100), additionally installing: gas turbine facilities (200); a high-temperature and high-pressure water line (10) that is provided so as to branch off from a feedwater line (5) in the steam turbine facilities (100) and to pass through a boiler (1); a branch fuel line (11) branched off from a fuel line (4) in the steam turbine facilities (100); a reformer (300) that reforms boiler fuel from the branch fuel line (11) by high-temperature and high-pressure water from the high-temperature and high-pressure water line (10); and a reformed fuel line that supplies the fuel reformed by the reformer (300), as gas turbine fuel, to a combustor (15) in the gas turbine facilities (200).