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Research Papers: Gas Turbines: Cycle Innovations

Assessment of Solar Gas Turbine Hybridization Schemes

[+] Author and Article Information
C. Kalathakis

Laboratory of Thermal Turbomachines,
National Technical University of Athens,
Athens 15780, Greece,
e-mail: chris@ltt.ntua.gr

N. Aretakis

Assistant Professor
Laboratory of Thermal Turbomachines,
National Technical University of Athens,
Athens 15780, Greece,
e-mail: naret@central.ntua.gr

I. Roumeliotis

Assistant Professor
Section of Naval Architecture
& Marine Engineering,
Hellenic Naval Academy,
Piraeus 18539, Greece,
e-mail: jroume@ltt.ntua.gr

A. Alexiou

Laboratory of Thermal Turbomachines,
National Technical University of Athens,
Athens 15780, Greece,
e-mail: a.alexiou@ltt.ntua.gr

K. Mathioudakis

Professor
Laboratory of Thermal Turbomachines,
National Technical University of Athens,
Athens 15780, Greece,
e-mail: kmathiou@central.ntua.gr

Contributed by the Cycle Innovations Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received October 13, 2016; final manuscript received November 7, 2016; published online February 1, 2017. Editor: David Wisler.

J. Eng. Gas Turbines Power 139(6), 061701 (Feb 01, 2017) (9 pages) Paper No: GTP-16-1499; doi: 10.1115/1.4035289 History: Received October 13, 2016; Revised November 07, 2016

A simulation environment allowing steady state and transient modeling is used for assessing several gas turbine based cycles proposed for solar hybridization. First, representative open cycle gas turbine configurations, namely, (a) single shaft (SS), (b) recuperated single-shaft, (c) twin shaft (TS), and (d) two-spool three-shaft, intercooled, recuperated, are evaluated. The importance of design point selection in terms of solar share value is highlighted. Solar steam injection gas turbine cycle (STIG) alternatives, namely, solar steam only and solar/fuel gas steam, are then assessed. Finally, the concept of a dual fluid receiver (DFR) for exploiting the rejected solar power by producing steam during sunny hours with high irradiation is demonstrated. The effects of hybridization on performance and operability are established and evaluated. Solarization effect on performance is estimated in terms of annual produced power and fossil fuel savings. The results indicate that the spool arrangement affects the suitability of a gas turbine for hybridization. Recuperated configurations performed better for the design constrains imposed by current technology solar parts. Solar steam injection is a promising solution for retrofitted fuel-only and conventional STIG engines.

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References

Figures

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Fig. 2

Hourly ambient temperature variation

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Fig. 1

Hourly DNI variation

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Fig. 3

Two-spool three-shaft intercooled recuperated solar hybrid scheme (2Sp3Sh_I_R)

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Fig. 10

Schematic layout of conventional and solar hybrid STIG cycle

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Fig. 4

Percentage difference of power output for one summer day between retrofitted and fuel-only engines

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Fig. 5

Percentage difference of specific fuel consumption for one summer day between retrofitted and fuel-only engines

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Fig. 6

Percentage change of engine annual performance for the hybridized two-spool and three-shaft intercooled recuperated configuration

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Fig. 7

Solar-only STIG schemes with (a) tower receiver and (b) troughs

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Fig. 8

Difference of produced steam between tower and troughs solar-only STIG engines for a summer and a winter day

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Fig. 9

Annual difference of performance between solar-only STIG and no STIG engines

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Fig. 14

Percentage difference of output power between the usual retrofitted and steam-injected retrofitted engines with the fuel-only one for a single day

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Fig. 11

Solar STIG engine operating points on compressor’s map through the year

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Fig. 12

Example of total, used and rejected sun thermal power for a summer day

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Fig. 13

Single-shaft hybrid engine with dual fluid receiver

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