Research Papers: Power Engineering

Micro Gas-Turbine Design for Small-Scale Hybrid Solar Power Plants

[+] Author and Article Information
Lukas Aichmayer

e-mail: lukas.aichmayer@energy.kth.se

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

1Corresponding author.

Contributed by the Power Division of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 9, 2013; final manuscript received July 18, 2013; published online September 17, 2013. Editor: David Wisler.

J. Eng. Gas Turbines Power 135(11), 113001 (Sep 17, 2013) (11 pages) Paper No: GTP-13-1246; doi: 10.1115/1.4025077 History: Received July 09, 2013; Revised July 18, 2013

Hybrid solar micro gas-turbines are a promising technology for supplying controllable low-carbon electricity in off-grid regions. A thermoeconomic model of three different hybrid micro gas-turbine power plant layouts has been developed, allowing their environmental and economic performance to be analyzed. In terms of receiver design, it was shown that the pressure drop is a key criterion. However, for recuperated layouts, the combined pressure drop of the recuperator and receiver is more important. In terms of both electricity costs and carbon emissions, the internally-fired recuperated micro gas-turbine was shown to be the most promising solution of the three configurations evaluated. Compared to competing diesel generators, the electricity costs from hybrid solar units are between 10% and 43% lower, while specific CO2 emissions are reduced by 20–35%.

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Fig. 3

T–s diagram of the open-cycle hybrid solar MGT, pressure losses have been exaggerated for emphasis

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Fig. 2

Open-cycle hybrid solar MGT

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Fig. 1

First commercial hybrid solar micro gas-turbine power plant at Kibbutz Samar, Israel [9]

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Fig. 7

T–s diagram of the externally-fired recuperated hybrid MGT cycle

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Fig. 6

Externally-fired recuperated hybrid solar MGT cycle

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Fig. 5

T–s diagram of the internally-fired recuperated hybrid solar MGT cycle

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Fig. 4

Internally-fired recuperated hybrid solar MGT cycle

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Fig. 8

Flow sheet of initial hybrid solar MGT design strategy for selection of the pressure ratio

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Fig. 9

Flow sheet of the sensitivity study for the solar component parameters

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Fig. 10

Flow sheet of the modeling strategy used in the thermoeconomic analysis

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Fig. 13

LCoE and specific CO2 emissions as a function of the pressure ratio

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Fig. 14

Conversion efficiency as a function of the pressure ratio

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Fig. 11

Heat transfer model of the closed volumetric solar receiver

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Fig. 17

Relative conversion efficiency as a function of the combined absolute pressure drop

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Fig. 18

LCoE and specific CO2 emissions as a function of the receiver outlet temperature and the fuel price

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Fig. 19

Solar share as a function of the receiver outlet temperature

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Fig. 20

Solar share as a function of the solar multiple

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Fig. 21

LCoE and specific carbon dioxide emissions as a function of the solar multiple and the fuel price

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Fig. 12

Effectively used thermal power in the receiver for different solar multiples

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Fig. 15

Annual solar share as a function of the pressure ratio

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Fig. 16

Investment cost breakdown for the MGT designs



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