System and method for controlling water injection in a turbine engine

摘要

A method for controlling the injection of water into the combustor (16) of a gas turbine (18) may include determining a flow rate of water to be injected into the combustor (16) and controlling (86) a centrifugal pump (20) with a variable frequency drive (40) to control the flow rate of water. The flow rate of water may be further controlled by controlling (88) a throttle valve (32) to control water flow through a recirculation line (28) of a water circuit (24) that directs the flow rate of water to the combustor (16). A system (10) for controlling the injection of water into the combustor (16) may include a water delivery circuit (24) for directing water from a water supply (12) to the combustor (16), a centrifugal pump (20) for pumping water through the water delivery circuit (24) and a variable frequency drive (40) for controlling a motor (42) driving the centrifugal pump (20). A system (70) may include a gas turbine (18), a combustor (16) integral with the gas turbine, a water circuit (24) for delivering a flow rate of water to a combustor (16) of the gas turbine, a variable frequency drive (40) for controlling a motor (42) driving the centrifugal pump (20) and a controller (72) configured to control the variable frequency drive (40) so that the centrifugal pump (20) produces a desired flow rate of water.