Abstract
A numerical method for modelling the dynamics of steam superheaters, based on solving equations describing the laws of mass, momentum, and energy conservation on the steam side, is presented. The transient temperatures of combustion gases and tube walls are evaluated iteratively, using relations derived from only the simplified equation of the energy balance. The suggested method considers the superheater model as one with distributed parameters. The inverse problem occurring in superheated steam temperature control is also solved using the Regula Falsi method. In order to verify the proposed methods, numerical calculations are carried out for the OP-210 boiler with steam capacity of 210·103 kg/h. The boiler operation is analysed in transient states during acceptance tests, start-up and shutdown of the boiler. Comparing the results of temperature measurement as well as the mass flow of injection water with numerical calculation results, a satisfactory convergence is found.
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