Adoption of CO2 blended with C6F6 as working fluid in CSP plants

Manzolini, Giampaolo; Binotti, Marco; Morosini, Ettore; Sánchez, David; Crespi, Francesco; Marcoberdino, Gioele Di; Iora, Paolo; Invernizzi, Costante Mario

doi:10.1063/5.0086520

Cited by 9 publications

(4 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The four methodology steps are detailed in the following subsections. The properties for the mixture are obtained with the Peng-Robinson method and a binary interaction parameter of kij=0.033 according to [9].…”

Section: Methods and Modellingmentioning

confidence: 99%

Dry-Cooled Rankine Cycle Operated With Binary Carbon Dioxide Based Working Fluids

Illyés,

Salah,

Abdeldayem

et al. 2024

SolarPACES Conf Proc

Self Cite

View full text Add to dashboard Cite

The dry-cooled Rankine cycle working with a zeotropic mixture of CO2+C6F6 is influenced by the ambient temperature as air is used as the heat sink. Varying heat sink temperatures allow for operating the cycle under sliding condensation pressure which may benefit a hybrid PV-CSP plant. The study demonstrates the effect of this operation mode on composition shift and condensation pressure and investigates the cycle performance. The results show that defining the turbine design conditions significantly impact whether the system´s thermodynamic performance behaves acceptably in off-design conditions. Operating the turbine which was designed for a big pressure ratio in part-load especially if both, inlet and outlet pressure are at off-design conditions, is not favorable and leads to deteriorated efficiencies. Under some constraints for turbine and heat exchanger design, the proposed cycle enhances the hybrid PV-CSP system.

show abstract

Section: Methods and Modellingmentioning

confidence: 99%

Dry-Cooled Rankine Cycle Operated With Binary Carbon Dioxide Based Working Fluids

Illyés,

Salah,

Abdeldayem

et al. 2024

SolarPACES Conf Proc

Self Cite

View full text Add to dashboard Cite

show abstract

“…The second power cycle considered for turbine maximum temperatures of 550°C is a sCO2 cycle adopting the recompression layout, proposed in figure 3. For maximum temperature levels of 700°C, instead, the steam cycle cannot be considered: the sCO2 recompression cycle is again considered for this applications, as various literature works highlighted its promising performances in recompression layout for solarized applications [27].…”

Section: Power Cycles Performance Assessmentmentioning

confidence: 99%

Techno-economic assessment of small-scale solar tower plants with modular billboard receivers and innovative power cycles

Morosini

Gentile

Binotti

et al. 2022

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

This work investigates performances and costs of various configurations of 5 MWel solar tower CSP plants, located in Sicily. The design of the plants aims at comparing two solar towers concepts (i.e., a single tower and modular towers), both adopting billboard receivers. A sensitivity on various heat transfer fluids (i.e., solar salt and sodium), storage fluids (solar salt and NaCl-MgCl2) and power block technologies (i.e., steam Rankine and sCO2 cycles) is also proposed. For each investigated plant configuration, tailored numerical models are presented to assess the performances of each plant subsystem (e.g., solar field, receiver, piping system, power cycle). The results show very competitive LCOE (between 160 and 180 $/MWhel), achievable with satisfactory capacity factors (around 55%), while suggesting good profitability levels for such investments in small scale CSP plants.

show abstract

“…According to the study presented by Tafur-Escanta et al [7], blending CO 2 with carbonyl sulfide (COS) increased the efficiency of the cycle to 45.05%, compared to 41.25% for pure CO 2 , while the specific investment cost decreased to 2621$/kWe for the blended CO 2 cycle compared to 2811$/kWe for the pure CO 2 cycle. The SCARABEUS consortium proposed hexafluorobenzene (C 6 F 6 ), sulfur dioxide (SO 2 ), and titanium tetrachloride (TiCl 4 ) as possible candidate mixtures [8,9]. The effects of changing C 6 F 6 and TiCl 4 molar fractions on cycle performance were presented, considering safety and health characteristics [10,11].…”

Section: Introductionmentioning

confidence: 99%

Design of a 130 MW Axial Turbine Operating with a Supercritical Carbon Dioxide Mixture for the SCARABEUS Project

Abdeldayem,

Salah,

Aqel

et al. 2024

IJTPP

View full text Add to dashboard Cite

Supercritical carbon dioxide (sCO2) can be mixed with dopants such as titanium tetrachloride (TiCl4), hexafluoro-benzene (C6F6), and sulphur dioxide (SO2) to raise the critical temperature of the working fluid, allowing it to condense at ambient temperatures in dry solar field locations. The resulting transcritical power cycles have lower compression work and higher thermal efficiency. This paper presents the aerodynamic flow path design of a utility-scale axial turbine operating with an 80–20% molar mix of CO2 and SO2. The preliminary design is obtained using a mean line turbine design method based on the Aungier loss model, which considers both mechanical and rotor dynamic criteria. Furthermore, steady-state 3D computational fluid dynamic (CFD) simulations are set up using the k-ω SST turbulence model, and blade shape optimisation is carried out to improve the preliminary design while maintaining acceptable stress levels. It was found that increasing the number of stages from 4 to 14 increased the total-to-total efficiency by 6.3% due to the higher blade aspect ratio, which reduced the influence of secondary flow losses, as well as the smaller tip diameter, which minimised the tip clearance losses. The final turbine design had a total-to-total efficiency of 92.9%, as predicted by the CFD results, with a maximum stress of less than 260 MPa and a mass flow rate within 1% of the intended cycle’s mass flow rate. Optimum aerodynamic performance was achieved with a 14-stage design where the hub radius and the flow path length are 310 mm and 1800 mm, respectively. Off-design analysis showed that the turbine could operate down to 88% of the design reduced mass flow rate with a total-to-total efficiency of 80%.

show abstract

Adoption of CO2 blended with C6F6 as working fluid in CSP plants

Cited by 9 publications

References 11 publications

Dry-Cooled Rankine Cycle Operated With Binary Carbon Dioxide Based Working Fluids

Dry-Cooled Rankine Cycle Operated With Binary Carbon Dioxide Based Working Fluids

Techno-economic assessment of small-scale solar tower plants with modular billboard receivers and innovative power cycles

Design of a 130 MW Axial Turbine Operating with a Supercritical Carbon Dioxide Mixture for the SCARABEUS Project

Contact Info

Product

Resources

About