Abstract: The present application provides a once-through evaporator system. The once-through evaporator system may include a number of once-through evaporator sections with a distribution valve and a level sensor and a controller in communication with each distribution valve. The controller provides the distribution valve with a position set point and biases the position set point via a feedforward signal based on a fill level as determined by the level sensor in each of the once-through evaporator sections.

Abstract: The present application provides a once-through evaporator system. The once-through evaporator system may include a number of once-through evaporator sections with a distribution valve and a level sensor and a controller in communication with each distribution valve. The controller provides the distribution valve with a position set point and biases the position set point via a feedforward signal based on a fill level as determined by the level sensor in each of the once-through evaporator sections.

Abstract: A combined cycle system where steam discharged from a water separation unit is routed through a high pressure outlet line to a set of super-heaters and discharged from the set of super-heaters through a main outlet line of a heat recovery steam generator to be introduced into the steam turbine. An attemperating line is connected between the high pressure outlet line and the main outlet line of the heat recovery steam generator to introduce a portion of steam that is discharged from the water separation unit into the steam discharged from the set of super-heaters. The pressure difference across a control valve for steam temperature remains low in low load and/or high load applications of the combined cycle system.