Burns & McDonnell and Alberici served as the engineer-procure-construction management (EPCm) contractor for the Queen Elizabeth repowering project, a 6x1 combined-cycle unit with six Hitachi 25C gas turbines, six Innovative Steam Technologies heat recovery steam generators (HRSGs) and a single Fuji steam turbine.
The existing Queen Elizabeth Power Station is a thermal electric generating facility consisting of six 24-MW gas turbines, three 32-MW gas turbines, a single 100-MW steam turbine and two 66-MW steam turbines. A natural gas-fired boiler provides steam to the 100-MW steam turbine in a conventional steam plant configuration. The six 24-MW gas turbines are each equipped with once-through steam generators and operate jointly to provide steam to either one of the two 66-MW steam turbines. The three 32-MW gas turbines operate in simple cycle mode.
The project includes converting the three existing simple cycle gas turbines to combined cycle by adding three new once-through steam generators to the exhaust end of the gas turbines. Three new 32-MW gas turbines will be added with once-through steam generators to provide a total of six combined cycle gas turbine trains, which provide steam to a new 100-MW steam turbine. Pre-engineered buildings will be installed to house the new gas turbines and once-through steam generators. The existing steam turbine building will be extended to house the new steam turbine and auxiliary equipment. The existing once-through circulating water system will be expanded to satisfy the additional heat rejection from the new combined cycle plant.
SaskPower will own and operate the 300-MW natural-gas fired power plant.
