Simulation of Power Plant Superheater Using
Advanced Simulink Capabilities
Pavel Nevriva, Stepan Ozana, Martin Pies
Abstract — The paper deals with simulation of both dynamics and control of power plant superheaters by means of Simulink Sfunctions. Superheaters are heat exchangers that transfer energy from flue gas to superheated steam. A composition of superheater, its input and output pipelines, and fittings is called a superheater assembly.
Inertias of superheater assembly are often decisive for design of a steam temperature control system. Mathematical model of a superheater assemble is described by sets of nonlinear partial differential equations. To analyze accuracy of the mathematical model, the system was agitated by test signals. Experiments carried out at the power plant were simulated mathematically. Data obtained by the measurement was compared with simulation results.
in . Mathematical model of a pipeline or a header can be developed from the mathematical model of the heat exchanger by introducing zero heat transfer coefficient from the surrounding (making the pipeline isolated). The models comprise many coefficients. Coefficients of pipelines and headers are usually known with the relatively good accuracy.
Let us consider the mathematical model of the superheater assembly comprising superheater, its associated pipelines and pipe fittings. The accuracy of the model would depend on both the accuracy and correctness of coefficients of the model of the superheater. In this paper, the deterministic verification of the mathematical model of the superheater and its associated parts is presented. The verification process was as follows.
The superheater assembly of operating 200 MW power plant was agitated by the set of long term forced input signals. The dynamic responses were both measured and simulated. The measured and calculated results were compared.
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