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Research Papers

A Thermoeconomic Study of Low-Temperature Intercooled-Recuperated Cycles for Pure-Solar Gas-Turbine Applications

[+] Author and Article Information
James Spelling1

 Department of Energy Technology, Royal Institute of Technology, SE-100 44 Stockholm, Swedenjames.spelling@energy.kth.se

Björn Laumert

 Department of Energy Technology, Royal Institute of Technology, SE-100 44 Stockholm, Swedenbjorn.laumert@energy.kth.se

Torsten Fransson

 Department of Energy Technology, Royal Institute of Technology, SE-100 44 Stockholm, Swedentorsten.fransson@energy.kth.se

1

Corresponding author.

J. Sol. Energy Eng 134(4), 041015 (Oct 17, 2012) (8 pages) doi:10.1115/1.4007532 History: Received February 27, 2012; Revised August 07, 2012; Published October 17, 2012; Online October 17, 2012

A dynamic model of a megawatt-scale low-temperature intercooled-recuperated solar gas-turbine power plant has been developed in order to allow determination of the thermodynamic and economic performance. The model was then used for multi-objective thermoeconomic optimization of both the power plant performance and cost, using a population-based algorithm. In order to examine the trade-offs that must be made and identify ‘optimal’ plant sizes and operating conditions, two conflicting objectives were considered, namely minimum investment costs and maximum annual electricity production. Levelized electricity costs from a 65 MWe power plant operating at 950 °C are predicted to be below 130 USD/MWhe , competitive with other solar thermal power technologies. Optimal plant sizes and configurations have been identified.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Intercooled-recuperated solar gas-turbine layout

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Figure 2

TRNSYS model of the intercooled-recuperated solar gas-turbine power plant

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Figure 3

Layout of a cell-wise heliostat field model

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Figure 4

Local heliostat field mirror density as a function of the normalized distance from the central tower

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Figure 5

Evolution of the 800 °C IRSGT designs during optimization, from an initial population of 120 through 15 generations

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Figure 6

Pareto-optimal frontiers for 650 °C, 800 °C, and 950 °C IRSGT configurations

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Figure 7

Power plant nominal power output versus total investment cost for 650 °C, 800 °C, and 950 °C IRSGT configurations

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Figure 8

Power plant nominal power output versus specific investment cost for 650 °C, 800 °C, and 950 °C IRSGT configurations

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Figure 9

Power plant nominal power output versus levelized electricity costs for 650 °C, 800 °C, and 950 °C IRSGT configurations

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Figure 10

Breakdown of IRSGT costs for different optimal configurations

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Figure 11

Power plant nominal power output versus annual solar-electric efficiency for 650 °C, 800 °C, and 950 °C IRSGT configurations

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Figure 12

Power plant nominal power output versus specific water usage for 650 °C, 800 °C, and 950 °C IRSGT configurations

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