Dynamic modeling and validation of the boiler-side whole process of subcritical coal-fired power plants

Abstract

Dynamic modeling of the utility boiler is the basis of operation optimization of the coal-fired power plant. In this paper, the boiler-side whole process dynamic models of the subcritical coal-fired unit are established based on the dynamic mass and energy b alance. The models cover the important heat transfer facilities on the boiler side, including the evaporation system, superheaters, reheaters, and economizer. The energy storage or release in the metal wall of these facilities and all the heat losses are also considered in the models. At last, the pseudo-online simulation based on presented models is carried out with the history data captured by the distribution control system of a real coal-fired power plant. It is found that model-based calculated total input energy is in good agreement with the offline assay value, which suggests the effectiveness of the presented models. The models have the potential for online process monitoring and operation optimization of the unit.