Adoption of the CO2 + SO2 mixture as working fluid for transcritical cycles: A thermodynamic assessment with optimized equation of state

This paper focuses on the use of CO2 + SO2 binary mixture as innovative working fluid for closed transcritical power cycles with a minimum temperature above 50 °C. Starting from literature review available experimental data mixture, PC-SAFT EoS is identified suitable model to characterize behavior. Once proper thermodynamic selected this comparison between cycle and sCO2 proposed various plant layouts in order find out advantages mixture. The analysis presented fixing maximum at 700 °C pressure 250 bar: results depict an increment electric efficiency specific work, along lower heat introduction any considered configuration cycle, when compared pure sCO2. An economic block then performed support selection fluid. Two most promising are evidenced: recompression layout highly efficient blocks, while dual recuperated works effectively applications characterized by higher hot source exploitation. adopting presents 48.67% (2.33% than respective cycle) reduction CAPEX 1160 $/kWel 1000 100MWel size, exploiting shows 39.58% (0.69% same cycle), decrease 795 718 70 additional recovery respect analogous cycle.