Modification method of combined cycle plant, distribution duct, combined cycle plant

摘要

To provide a remodeling method and the like of a combined cycle plant capable of improving CC efficiency while suppressing an increase in cost by diverting existing facilities.SOLUTION: In a removal step S12 for removing two gas turbines 10 and two ducts 17 and a removal step S12 for removing two gas turbines 10 and two ducts 17 in place of the two gas turbines 10, A gas turbine installation step S13 for installing a new gas turbine 10a and a distribution duct 70 for distributing and guiding the exhaust gas from the new gas turbine 10a to the two exhaust heat recovery boilers 20 in place of the plurality of ducts 17 And a distribution duct installation step S13 for installing the distribution duct.(FIG.