Once-through evaporator systems
AssigneeGeneral Electric Technology GmbH
InventorsPetrus Johannes Koller, Rudolf Zinniker, Hans Ulrich Lenherr, Alexander Taylor, Stefan Lukas Gysel
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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.
Claims14
A once-through evaporator system, comprising:
- a plurality of once-through evaporator sections;
- each of the plurality of once-through evaporator sections comprising a distribution valve and a level sensor;
- a controller in communication with each distribution valve;
- the controller providing the distribution valve with a position set point;
- and
- the controller biasing the position set point via a feedforward signal based on a fill level as determined by the level sensor in each of the plurality of once-through evaporator sections.
A method of starting a once-though evaporator system, comprising:
- feeding feedwater into a once-through evaporator section for a predetermined flow rate for a predetermined time;
- controlling the feedwater flow rate via a dynamic feedforward signal;
- and
- controlling the feedwater flow rate via the dynamic feedforward signal and temperature feedback control based on once-through evaporator section exit temperatures.
Dependencies are inferred from the claim text.