Research Papers: Gas Turbines: Cycle Innovations

Solar Hybrid Combined Cycle Performance Prediction Influence of Gas Turbine Model and Spool Arrangements

[+] Author and Article Information
G. Barigozzi

e-mail: giovanna.barigozzi@unibg.it

G. Bonetti

e-mail: giulio.bonetti@unibg.it

G. Franchini

e-mail: giuseppe.franchini@unibg.it

A. Perdichizzi

e-mail: antonio.perdichizzi@unibg.it

S. Ravelli

e-mail: silvia.ravelli@unibg.it
Università degli Studi di Bergamo,
Dipartimento di Ingegneria Industriale,
Viale Marconi 24044,
Dalmine (BG)Italy

Contributed by International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received June 22, 2012; final manuscript received July 2, 2012; published online October 11, 2012. Editor: Dilip R. Ballal.

J. Eng. Gas Turbines Power 134(12), 121701 (Oct 11, 2012) (11 pages) doi:10.1115/1.4007340 History: Received June 22, 2012; Revised July 02, 2012

A modeling procedure was developed to simulate design and off-design operation of hybrid solar gas turbines in a combined cycle (CC) configuration. The system includes a heliostat field, a receiver, and a commercial gas turbine (GT) interfaced with a conventional steam Rankine cycle. Solar power input is integrated in the GT combustor by natural gas. Advanced commercial software tools were combined together to get design and off-design performance prediction: TRNSYS® was used to model the solar field and the receiver while the gas turbine and steam cycle simulations were performed by means of Thermoflex®. Three GT models were considered, in the 35–45 MW range: a single shaft engine (Siemens SGT-800) and two two-shaft engines (the heavy-duty GT Siemens SGT-750 and the aero derivative GE LM6000 PF). This was in order to assess the influence of different GT spool arrangements and control strategies on GT solarization. The simulation method provided an accurate modeling of the daily solar hybrid CC behavior to be compared against the standard CC. The effects of solarization were estimated in terms of electric power and efficiency reduction, fossil fuel savings, and solar energy-to-electricity conversion efficiency.

Copyright © 2012 by ASME
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Fig. 1

Hybrid solar gas turbine schematic

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Fig. 2

Layout of the reference CC power plant

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Fig. 3

SGT-750 Thermoflex model: 1. compressor, 2. heat adder, 3. combustor, 4. compressor turbine, 5. power turbine, a-d pressure drop

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Fig. 4

(a) Ambient temperature and (b) solar irradiation profiles

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Fig. 5

GT shaft configurations

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Fig. 6

GTs (a) power output, (b) heat rate, (c) exhaust gas mass flow rate, and (d) exhaust gas temperature versus ambient temperature (lines are from manufacturer and symbols from GT models)

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Fig. 7

GTs (a) TIT and (b) IGV control versus ambient temperature

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Fig. 8

Hourly compressor and turbine exhaust temperatures

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Fig. 9

Hourly receiver exhaust temperature

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Fig. 10

Hourly compressor pressure ratio β

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Fig. 11

Hourly GT inlet air mass flow

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Fig. 12

Hourly free spool normalized rotational speed

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Fig. 13

Hourly CC net power underproduction variation

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Fig. 14

Hourly CC net efficiency variation

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Fig. 15

Hourly fuel energy input variation

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Fig. 16

Hourly GT gross power underproduction variation

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Fig. 17

Hourly GT efficiency variation

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Fig. 18

Hourly ST power underproduction variation

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Fig. 19

Hourly solar fraction variation




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