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Título
Roads to improve the performance of hybrid thermosolar gas turbine power plants: Working fluids and multi-stage configurations
Autor(es)
Materia
Thermosolar hybrid plants
Thermal energy engineering
Multi-stage Brayton
Overall efficiency
Improved pre-design
Fecha de publicación
2018-03-20
Editor
Elsevier Science Publishers (Amsterdam, Países Bajos)
Citación
Santos, M.J., Miguel-Barbero, C., Merchán, R.P., Medina, A., Calvo, A. (2018). Roads to improve the performance of hybrid thermosolar gas turbine power plants: Working fluids and multi-stage configurations. Energy Conversion and Management, 165, pp. 578-592
Resumen
[EN]This paper presents a general thermodynamic model for hybrid Brayton central
tower thermosolar plants. These plants have been proved to be technically
feasible but R+D e orts need to be done in order to improve its
commercial interest. From the thermodynamic viewpoint it is necessary to
increase its performance to get larger power production with reduced fuel
consumption, and so reduced emissions. We develop a model for multi-step
compression and expansion stages with that aim. The model is
exible and
allows to simulate recuperative or non-recuperative plants, with an arbitrary
number of stages and working with di erent subcritical
uids. The results
for multi-step con gurations are compared with those obtained for a plant
with one turbine and one compressor. Di erent working
uids are analyzed,
including air, nitrogen, carbon dioxide, and helium. Several plant layouts
and the corresponding optimal pressure ratios are analyzed. It is concluded
that con gurations with two-stages compression with intercooling combined
with one or two expansion stages can signi cantly improve overall plant ef-
ciency and lower fuel consumption. Power block e ciencies can reach 0.50
and overall plant e ciency can attain values about 0.40 working with air or
CO2. For instance, comparing with a single stage plant running with air,
a plant with subcritical CO2, two compression stages with intercooling and
single step expansion can reach an overall e ciency about 19% larger and a
fuel conversion rate around 23% larger. For such con guration, the speci c
fuel consumption is predicted to be about 108 kg/(MW h) at design point
conditions.
URI
ISSN
0196-8904
DOI
10.1016/j.enconman.2018.03.084
Versión del editor
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- GIOETFE. Artículos [53]