Once-through evaporator systems
AssigneeGeneral Electric Technology GmbH
InventorsPetrus Johannes KOLLER, Alexander TAYLOR
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Abstract
The present application provides a method of adjusting a feedwater mass flow rate to maintain a constant steam temperature in an evaporator section. The method may include the steps of determining a change in a number of operational parameters, predicting a change in steam temperature based on the number of operational parameters, combining the predicted changes in steam temperature, determining a feedforward signal based on dynamically offsetting the combined predicted changes in steam temperature, and changing the mass flow rate of feedwater based on the feedforward signal.
Claims15
A method of adjusting a feedwater mass flow rate to maintain a constant steam temperature in an evaporator section, comprising:
- determining a change in a plurality of operational parameters;
- predicting a change in steam temperature based on one or more of the plurality of operational parameters;
- combining the predicted changes in steam temperature;
- determining a feedforward signal based on dynamically offsetting the combined predicted changes in steam temperature;
- and
- changing the feedwater mass flow rate based on the feedforward signal.
A once-through evaporator system, comprising:
- a plurality of once-through evaporator sections;
- each of the plurality of once-through evaporator sections comprising an upstream distribution valve and a controller;
- wherein the controller provides the distribution valve with a flow set point to provide a predetermined stream temperature;
- and
- wherein the controller provides the distribution valve with a feedforward signal based on changes in operational parameters to maintain the predetermined steam temperature.
Dependencies are inferred from the claim text.