Combined heat and power stations with pressurized fluidised-bed coal combustion offer the possibility to use efficiently and environmentally-friendly hard and brown coal or other fuels.  Goal of this research project was to provide a dynamic simulation model for a steam generating unit with a stationary pressurized fluidised bed. In the modelling particular emphasis was given to the mutual interactions in the total process between the reactor, the gas turbine/compressor unit and the water/steam cycle. For the mathematical modelling the entire plant complex is divided into its main components. The time-dependent behaviour of the individual components is described with non-steady balance equations. These equations are discretised temporally and spatially and solved numerically. The programming implementation of the software was done with an object-oriented simulation environment.

The computer model can reproduce and optimize the dynamic flow chart of of the plants tested. In particular this applies to rapid changes at high load as well as unusual operating conditions or incidents with emergency shut-downs. During the design of new installations the influence of individual equipment characteristics on the dynamic behaviour of the entire plant can be examined with the help of the simulation model, whereby it is also necessary to include the plant control system into the model.  For testing and improvement of the simulation model experimental investigations were performed in a pressurized fluidised-bed steam generator in a newly commissioned combined heat and power station.