Abstract
AbstractThis paper presents a model of the temperature dynamics of a heat exchanger unit and it shows how it can be used as building block of a simulation model of a coal fired once-through boiler. The heat exchanger model is based on balances of non-isothermal system in the form of partial differential equations. The heat exchanger model solves the complex problem of heat energy transfer from flue gases to the water/steam. The main emphasis is on the use of the model for control design and optimization. The model developed in the paper can be used in a wide range of operation conditions and it covers all standard operation states and a huge set of possible disturbances. The model has been developed in the design phase of a power plant and its verification based on real measured data was performed using the measured data from another power plant with similar boiler design. This comparison is included in the paper. The complete model of a once-through boiler is now used to test and develop control algorithms for one power plant in its design phase and one power plant with similar technology that is already in operation. Some results were used to design control structures for the rejection of certain specific disturbances.
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