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Small scale solar tower coupled with micro gas turbine

Author

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  • Giostri, A.
  • Binotti, M.
  • Sterpos, C.
  • Lozza, G.

Abstract

This paper studies a small-scale CSP system composed of a solar tower and a recuperative air micro gas turbine (i.e. net power in the 100–200 kWe range). A code is developed to determine the optical performance of the heliostat field coupled with a secondary concentrator, while another code computes the thermal engine performance. The 832 m2 heliostat field layout is taken from a real plant, while the secondary optics is studied to maximize the optical-thermal efficiency. The selected secondary concentrator (CPC), with an aperture diameter of 0.5 m and an acceptance angle of 35° tilted of 52.5°, guarantees an overall optical efficiency of 77.9% in design conditions (Spring equinox, solar noon) and of 66.9% on yearly basis. For every Effective DNI (EDNI) and ambient temperature the turbine operation is optimized allowing to achieve a yearly solar-to-electricity efficiency of 16.3%. Summing up the cost of each component, an overall plant cost of about 2300 €/kW (peak) and a LCOE of 175 €/MWh are obtained. A sensitivity analysis on design EDNI, impacting on turbine size, is performed showing that its reduction from 700 W/m2 to 550 W/m2 allows reducing the LCOE down to 158 €/MWh, a value competitive with large-scale solar towers. The possibility of hybridization of plant (i.e. improving the gas turbine power output in selected hours, by means of biomethane or natural gas combustion) was considered to further reduce the LCOE.

Suggested Citation

  • Giostri, A. & Binotti, M. & Sterpos, C. & Lozza, G., 2020. "Small scale solar tower coupled with micro gas turbine," Renewable Energy, Elsevier, vol. 147(P1), pages 570-583.
    • Handle: RePEc:eee:renene:v:147:y:2020:i:p1:p:570-583
    DOI: 10.1016/j.renene.2019.09.013
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    References listed on IDEAS

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