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PRAMEK

Influence of working medium on structural materials used in the steam/water cycle of the energy units.

The main activities of the project will be exposures of selected materials to supercritical water (SCW) and high-temperature steam (SCWVP) with chemical regime induced with respective chemicals. The exposures will be carried out in a unique facility, in ownership of the Centrum vyzkumu Rez, Ltd. (CVR), which is able to simulate operational conditions in supercritical and high-temperature fossil units (NFB). After the exposure, the effect of the SCW and SCWVP on the samples will be evaluated with modern techniques available in CVR, ÚJV Řež (The Nuclear Research Institute) and The University of Chemistry and Technology in Prague (UCT Prague). The mainly studied characteristics will be changes in mechanical properties (using traction testing) and microstructure (using electron microscopy – scanning and transmission). Alternatively, it will be performed fractographical analyses in case of refraction (studied by optical microscopy), corrosion changes on samples will be also followed – especially focused on the sample surface (by means of electron spectroscopy for chemical analysis (ESCA), TEM and SEM). The quality of emerging layers on the material will be evaluated (by methods of Mott-Schottky and electrochemical impedance spectroscopy – EIS).

The results from these analyses should help to understand the effect of the chemistry on concrete material, and help to set the best coolant parameters. The parties that will participate in finding the solution will be both industrial partners dealing with application of SCW facilities in the near future (Škoda Power, ČEZ, a. s.), top-class organisations involved in the material research that possess unique equipment (CVR, ÚJV Rez, UCT Prague), and organisations that provide surface finish for materials (BG SYS HT, Ltd.). The experimental results and methodology from this project will be published mainly in foreign literature dealing with corrosion impact of supercritical liquids and high‑temperature steam.

With respect of the possible use of SCWVP in many applications, not only energetics, the learning of mechanism and impact of this coolant with various additives on the structural materials represents a significant knowledge necessary for safe and financially advantageous usage of such technologies. In case of optimisation of the corrosion impact of SCWVP on the given material by adjusting of chemical conditions, it is possible – not only in the emerging NFB but also in present power plants with operational temperature up to 570 °C at 17 MPa – to significantly increase safety and economical operation of such units and consequently to lower the impact of anthropogenic emissions not only to the environment but also to the society as such.

 

The project TA03020905 is solved with financial support from Technology Agency of the Czech Republic.

Technologická agentura ČR Technologická agentura ČR – Program Alfa