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Research Papers: Gas Turbines: Cycle Innovations

Enhancing the Economic Competitiveness of Concentrating Solar Power Plants Through an Innovative Integrated Solar-Combined Cycle With Thermal Energy Storage

[+] Author and Article Information
Rafael Guédez

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

James Spelling

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

Björn Laumert

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

1Corresponding author.

Contributed by the Cycle Innovations Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 21, 2014; final manuscript received August 5, 2014; published online November 11, 2014. Editor: David Wisler.

J. Eng. Gas Turbines Power 137(4), 041701 (Apr 01, 2015) (9 pages) Paper No: GTP-14-1423; doi: 10.1115/1.4028655 History: Received July 21, 2014; Revised August 05, 2014; Online November 11, 2014

The present work deals with the thermo-economic analysis of an innovative combined power cycle consisting of a molten-salt solar tower power plant with storage supported by additional heat provided from the exhaust of a topping gas-turbine unit. A detailed dynamic model has been elaborated using an in house simulation tool that simultaneously encompasses meteorological, demand and price data. A wide range of possible designs are evaluated in order to show the trade-offs between the objectives of achieving sustainable and economically competitive designs. Results show that optimal designs of the novel concept are a promising cost-effective hybrid option that can successfully fulfill both the roles of a gas peaker plant and a baseload solar power plant in a more effective manner. Moreover, designs are also compared against conventional combined cycle gas turbine (CCGT) power plants and it is shown that, under specific peaking operating strategies (P-OSs), the innovative concept cannot only perform better from an environmental standpoint but also economically.

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Figures

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Fig. 1

Schematic flowsheet of the SSTCC

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Fig. 2

Flow of information and calculation in DYESOPT

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Fig. 3

Meteorological, demand, and price data for Seville (37°N 2°E) from June 18 to June 24 of 2012

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Fig. 4

LEC results for all possible plant designs

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Fig. 5

Trade-off between annual specific CO2 emissions and LEC for optimal plant designs

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Fig. 6

Economic performance sensitivity to natural gas cost

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Fig. 7

LEC sensitivity to air-to-salt heat exchanger cost

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