Research Papers

A Detailed Techno-Economic Analysis of Gas Turbines Applied to Concentrated Solar Power Plants With Central Receiver

[+] Author and Article Information
Manuel Martín

Abengoa Power,
Campus Palmas Altas,
C/Energía Solar 1,
Seville 41014, Spain
e-mail: m.martin@abengoa.com

David Sánchez

Department of Energy Engineering,
University of Seville,
Camino de los descubrimientos s/n,
Seville 41092, Spain
e-mail: ds@us.es

1Corresponding author.

Manuscript received June 25, 2018; final manuscript received July 10, 2018; published online December 4, 2018. Editor: Jerzy T. Sawicki.

J. Eng. Gas Turbines Power 141(3), 031030 (Dec 04, 2018) (9 pages) Paper No: GTP-18-1348; doi: 10.1115/1.4040844 History: Received June 25, 2018; Revised July 10, 2018

This work presents a very detailed techno-economic analysis of the technology, made up of two complementary models. A performance model implemented in Thermoflex environment is used to explore alternative integration layouts in order to enable the simultaneous operation on solar and fossil energy. Then, a detailed cost analysis calculates the capital and operation costs of the plant from the engineering, procurement and construction standpoints. These two models are then combined in annual simulations to obtain the final levelized cost of electricity (LCoE) from which a solid conclusion about the true potential of solar gas turbines can be ascertained. A sensitivity analysis with respect to the main boundary conditions is also provided. The results confirm that LCoE in the order of 14 c€/kWh can be obtained when running the plant during sun hours (daily operation), yielding almost 70% annual solar share and for a fuel cost of 8 €/MBTU. In a higher fuel cost scenario (12 €/MBTU), this cost rises to almost 17 c€/kWh whereas it decreases to 10.5 c€/kWh if fuel costs are 4 €/MBTU. The different sensitivity analyses performed highlight the very strong regional effect on LCoE, not only for direct normal irradiance (DNI) but also for the largely variable local labor costs.

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Fig. 1

Cost of electricity of solar tower STE technology

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Fig. 2

Possible integration layouts

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Fig. 3

Sketch of the receivers used in Solugas (right) and in this work (left)

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Fig. 4

Thermoflex model of the power block

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Fig. 5

Relative cost index of the solar tower

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Fig. 6

Specific cost of the gas turbine

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Fig. 7

Solar share and LCoE (daily operation)

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Fig. 8

Solar share and LCoE (base load)

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Fig. 9

Levelized cost of electricity sensitivity to fuel costs (daily operation)

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Fig. 10

Levelized cost of electricity sensitivity to fuel costs (base load)

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Fig. 11

Levelized cost of electricity sensitivity to fuel costs (comparison)

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Fig. 12

Sensitivity to solar heat input at 25 °C (I)

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Fig. 13

Sensitivity to solar heat input at 25 °C (II)

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Fig. 14

Sensitivity to ambient temperature at 120 MWt (I)

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Fig. 15

Sensitivity to ambient temperature at 120 MWt (II)

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Fig. 16

Daily performance in a clear winter day (I)

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Fig. 17

Daily performance in a clear winter day (II)

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Fig. 18

Daily performance in a transient day (I)

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Fig. 19

Daily performance in a transient day (II)



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