METHODS, SYSTEMS AND APPARATUS RELATING TO REHEAT COMBUSTION TURBINE ENGINES WITH EXHAUST GAS RECIRCULATION

摘要

A method of controlling a power plant that includes a working fluid and a recirculation loop, wherein the power plant includes a combustion system having an upstream combustor operably connected to a high-pressure turbine and a downstream combustor operably connected to a low-pressure turbine. The method includes: recirculating the working fluid through the recirculation loop; controlling a compressed oxidant amount supplied to the upstream combustor and the downstream combustor; controlling a fuel amount supplied to the upstream combustor and the downstream combustor; controlling the power plant such that each of the upstream combustor and the downstream combustor periodically operates at a preferred stoichiometric ratio; and selectively extracting the working fluid from a first extraction point associated with the upstream combustor and a second extraction point associated with the downstream combustor based upon which combustors operates at the preferred stoichiometric ratio.