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Research Papers: Gas Turbines: Electric Power

A Comparative Thermoeconomic Study of Hybrid Solar Gas-Turbine Power Plants

[+] Author and Article Information
James Spelling

e-mail: james.spelling@energy.kth.se

Björn Laumert

e-mail: bjorn.laumert@energy.kth.se

Torsten Fransson

e-mail: torsten.fransson@energy.kth.se
Department of Energy Technology,
KTH Royal Institute of Technology,
Stockholm SE-100 44, Sweden

Contributed by the Electric Power Committee of ASME for publication in the Journal of Engineering for Gas Turbines and Power. Manuscript received June 27, 2013; final manuscript received July 9, 2013; published online October 21, 2013. Editor: David Wisler.

J. Eng. Gas Turbines Power 136(1), 011801 (Oct 21, 2013) (10 pages) Paper No: GTP-13-1199; doi: 10.1115/1.4024964 History: Received June 27, 2013; Revised July 09, 2013

The construction of the first generation of commercial hybrid solar gas-turbine power plants will present the designer with a large number of choices. To assist decision making, a thermoeconomic study has been performed for three different power plant configurations, namely, simple- and combined-cycles along with a simple-cycle with the addition of thermal energy storage. Multi-objective optimization has been used to identify Pareto-optimal designs and highlight the trade-offs between minimizing investment costs and minimizing specific CO2 emissions. The solar hybrid combined-cycle power plant provides a 60% reduction in electricity cost compared to parabolic trough power plants at annual solar shares up to 20%. The storage integrated designs can achieve much higher solar shares and provide a 7–13% reduction in electricity costs at annual solar shares up to 90%. At the same time, the water consumption of the solar gas-turbine systems is significantly lower than conventional steam-cycle based solar power plants.

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References

Figures

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Fig. 1

Simple-cycle HSGT power plant with a serial hybridization arrangement

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Fig. 2

Temperature-entropy diagram for an HSGT cycle. The pressure and piping losses in the central tower have been exaggerated for emphasis.

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Fig. 3

HSGT power plant with an integrated high-temperature thermal energy storage unit

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Fig. 4

Flowsheet of the modeling strategy adopted in the thermoeconomic analysis tool

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Fig. 5

Pareto-optimal frontier for a generic trade-off between quality and cost

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Fig. 6

Evolutionary algorithm convergence from an initial population of 60 through 40 generations

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Fig. 7

Final Pareto-optimal frontiers for the three different power plant configurations

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Fig. 8

Specific investment cost as a function of the annual solar share for the Pareto-optimal designs

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Fig. 9

Levelized electricity cost as a function of the annual solar share for the Pareto-optimal designs

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Fig. 10

Specific CO2 emissions as a function of the annual solar share for the Pareto-optimal designs

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Fig. 11

Specific water consumption as a function of the annual solar share for the Pareto-optimal designs

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Fig. 12

Specific CO2 emissions as a function of the levelized cost of electricity for the Pareto-optimal designs

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