Environmental Assessment of a HYSOL CSP Plant Compared to a Conventional Tower CSP Plant

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Abstract

The aim of this paper is to evaluate the environmental performance of a Concentrating Solar Power (CSP) plant based on HYSOL technology. The plant under investigation is a solar tower system with 14 hours thermal energy storage using biomethane as auxiliary fuel and using a 100 MWe steam turbine and a 80 MWe gas turbine in the combined cycle (Brayton and Rankine) characteristic of the HYSOL technology. The results evidence that HYSOL technology performs significantly better in environmental terms than conventional CSP. This evidence is particularly relevant in the climate change category where HYSOL plants presents 43.0 kg CO2 eq /MWh. In contrast, the hybrid CSP plant operating with natural gas emits 370 kg CO2 eq /MWh. This difference is attributable primarily to the nature of the auxiliary fuel (biomethane in HYSOL and natural gas in conventional CSP), but also to the higher thermal efficiencies achieved in the HYSOL configuration, which prevents the emission of 106 kg CO2 eq /MWh. The environmental significance of the additional components and infrastructure associated with the Brayton cycle in the HYSOL technology (gas turbine, Heat Recovery System and Low Temperature Energy Storage) are negligible.

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Corona, B., Ruiz, D., & San Miguel, G. (2016). Environmental Assessment of a HYSOL CSP Plant Compared to a Conventional Tower CSP Plant. In Procedia Computer Science (Vol. 83, pp. 1110–1117). Elsevier B.V. https://doi.org/10.1016/j.procs.2016.04.231

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