A Feedwater Heater Model Intended For Model-Based Diagnostics

Tomasz Barszcz (1) , Piotr Czop (1)

1 Department of Robotics and Mechatronics [Krakow]

Work related to the first-principle modeling of a feedwater heater operating in a coal-fired power unit is presented, along with theoretical discussion concerning its structural simplifications, parameter estimation, and dynamical validation. The objectives of this work are as follows: (i) formulate and deploy a moderately complex first-principle model of a feedwater heater to reproduce operational measurements in real-time simulations, (ii) develop a tuning method for this model, (iii) propose key indicators of heater performance using a model-based approach, and finally (iv) automate the calculation process of the indicators. A feedwater heater model is the main contributor to the performance of the entire simulation model of a power unit. In this work, the development process of such a model is presented, including necessary simplifications for improving its performance and functionality. As a result of the proposed simplifications, performance which allows operational data to be tracked by means of continuously updating model parameters in real-time mode was achieved on a regular PC workstation for a series of six low- and high-pressure heaters. The model variables (e.g. variability of the power rate of energy exchange) and estimated parameter values were used to formulate key performance indicators intended for a model-based diagnostics approach. Validation was successfully performed using operational data from a 225MW coal-fired power unit.

Mots clés: power plant; feedwater heater; modeling; system identification

Domaines: Thermique [physics.class-ph]; Thermique [physics.class-ph]

Tomasz Barszcz, Piotr Czop. A Feedwater Heater Model Intended For Model-Based Diagnostics. Applied Thermal Engineering, 2011, 31 (8-9), pp.1357. ⟨10.1016/j.applthermaleng.2010.12.012⟩. ⟨hal-00730302⟩