Within the DYNCAP project, the Modelica library ClaRaCCS is being developed. This library will provide a framework to model both steam power plants and carbon capture units in an integrated manner. The current status of the library is presented. The structure of the library and the general model design is outlined. Its user-friendly handling as well as its high flexibility in the modelling of individual complex scenarios are demonstrated by the concrete modelling of a furnace. The scenario of a closed steam cycle coupled to a carbon capture cycle based on an amine gas treatment is described and simulation results are briefly discussed.

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Boiling in vertical and horizontal pipes is a complex process defining transient and static performance of various technical applications. This work presents an extended heat transfer model which takes the complete boiling process into account. Models from the literature for the different boiling regimes are evaluated with respect to accuracy and suitability for system simulation application. A set of sub-models for each of the existing boiling phenomena is implemented and applied to the global boiling model. Special attention is paid to smooth transition between the sub-models and to numerical efficient solutions with respect to the consideration of the boiling crisis. The simulation results show good accordance with literature data.

This paper presents the current state of the open-source Modelica library ClaRa which enables the user to solve complex power plant simulation tasks. The library can be used to help control experts to develop and test controllers without disturbing the daily operation of the applying power plant. This reduces project risks and costs significantly. As a use case the analysis and optimisation of a Benson boiler power control is presented. The presented solution reduces the impact of soot blowing on the power output by 57 %.

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