Research Papers: Gas Turbines: Cycle Innovations

Simulation of Solarized Combined Cycles: Comparison Between Hybrid Gas Turbine and ISCC Plants

[+] Author and Article Information
Giovanna Barigozzi

e-mail: giovanna.barigozzi@unibg.it

Giuseppe Franchini

e-mail: giuseppe.franchini@unibg.it

Antonio Perdichizzi

e-mail: antonio.perdichizzi@unibg.it

Silvia Ravelli

e-mail: silvia.ravelli@unibg.it
Dipartimento di Ingegneria,
Università di Bergamo,
Viale Marconi 5,
Dalmine (BG) 24044, Italy

Contributed by the Cycle Innovations Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received September 2, 2013; final manuscript received September 19, 2013; published online November 19, 2013. Editor: David Wisler.

J. Eng. Gas Turbines Power 136(3), 031701 (Nov 19, 2013) (10 pages) Paper No: GTP-13-1337; doi: 10.1115/1.4025836 History: Received September 02, 2013; Revised September 19, 2013

The present paper investigates two different solarized combined cycle layout configurations. In the first scheme, a solarized gas turbine is coupled to a solar tower. Pressurized air at the compressor exit is sent to the solar tower receiver before entering the gas turbine (GT) combustor. Here, temperature is increased up to the nominal turbine inlet value through natural gas combustion. In the second combined cycle (CC) layout, solar energy is collected by line focusing parabolic trough collectors and used to produce superheated steam in addition to the one generated in the heat recovery boiler. The goal of the paper is to compare the thermodynamic performance of these concentrating solar power (CSP) technologies when working under realistic operating conditions. Commercial software and in-house computer codes were combined together to predict CSP plant performance both on design and off-design conditions. Plant simulations have shown the beneficial effect of introducing solar energy at high temperature in the Joule–Brayton cycle and the drawback in terms of GT performance penalization due to solarization. Results of yearly simulations on a 1 h basis for the two considered plant configurations are presented and discussed. The main thermodynamic parameters such as temperatures, pressure levels, and air and steam flow rates are reported for two representative days.

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Fig. 1

Schematic of the investigated solar-fossil combined cycle: ISCC versus SHCC option

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Fig. 2

HTF/steam HX T–Q diagram

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Fig. 3

Heliostat efficiency map

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Fig. 4

Ambient temperature and solar irradiation profiles

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Fig. 5

Hourly intercepted radiation and net thermal power

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Fig. 6

Hourly CC power production

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Fig. 7

Hourly GT power production

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Fig. 8

Hourly ST power production

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Fig. 9

ST's (a) HP inlet pressure, (b) HP inlet temperature, (c) HP mass flow rate, (d) LP outlet pressure

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Fig. 10

Steam turbine expansion lines with and without solar contribution

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Fig. 11

Hourly solar fraction

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Fig. 12

Daily solar to thermal and solar to electric efficiencies

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Fig. 13

Monthly intercepted radiation and collected thermal energy

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Fig. 14

Monthly solar electricity production and average solar-to-electric efficiency



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