The deaerator component is modelled by adapting the model presented by Banda, and modifying the model to work under various conditions. The model also contains transient effects, which include thermal inertia due to the shaft and casing, and rotational inertia due to the shaft. The turbine component is modelled by using Fuls’ Semi-Ellipse law or the pressure drop modelling and Ray’s semi-empirical method for the efficiency modelling. The level control is modelled by using a level representation built from using heat exchanger design methods. This approach eliminates the need for specific geometrical details to calculate the effective heat transfer area. In determining the heat transfer characteristics, the model makes use of plant-performance data and correlates the amount of heat transfer by using the feedwater mass flow as the load indicating parameter. The feedwater heater component model includes transient effects and thermodynamic relations to represent aspects such as heater performance, level control and transient inertia.
The components have been modelled all with the aim of using minimal design input data. This report details the development of a feedwater heater, deaerator and turbine component for such a high-fidelity transient system model using the Flownex Simulation Environment, a onedimensional thermohydraulic network solver. Consequently, the need for a fully transient high-fidelity system based model has grown, as this will enable one to study the behaviour of plants under such non-ideal conditions. The behaviour of plants, operating at low load and varying conditions, is getting more and more attention due to the introduction of variable renewable generation on the grid.
#COAL FIRED POWER PLANT SIMULATION FULL#
Large coal-fired power stations are designed to be run predominantly at full load and optimum conditions.