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Research Papers

Performance and Water Consumption of the Solar Steam-Injection Gas Turbine Cycle

[+] Author and Article Information
Abraham Kribus

e-mail: kribus@tauex.tau.ac.il
School of Mechanical Engineering,
Tel Aviv University,
Tel Aviv 69978, Israel

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received February 27, 2012; final manuscript received September 1, 2012; published online November 28, 2012. Assoc. Editor: Manuel Romero Alvarez.

J. Sol. Energy Eng 135(1), 011020 (Nov 28, 2012) (7 pages) Paper No: SOL-12-1059; doi: 10.1115/1.4007687 History: Received February 27, 2012; Revised September 01, 2012

Solar heat at moderate temperatures around 200 °C can be utilized for augmentation of conventional steam-injection gas turbine power plants. Solar concentrating collectors for such an application can be simpler and less expensive than collectors used for current solar power plants. We perform a thermodynamic analysis of this hybrid cycle, focusing on improved modeling of the combustor and the water recovery condenser. The cycle's water consumption is derived and compared to other power plant technologies. The analysis shows that the performance of the hybrid cycle under the improved model is similar to the results of the previous simplified analysis. The water consumption of the cycle is negative due to water production by combustion, in contrast to other solar power plants that have positive water consumption. The size of the needed condenser is large, and a very low-cost condenser technology is required to make water recovery in the solar STIG cycle technically and economically feasible.

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Figures

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Fig. 1

Schematic layout of the solar STIG cycle

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Fig. 2

Temperature Entropy diagram for case C, (a) conventional STIG cycle with SAR = SARM = 0.155 and (b) Solar STIG cycle, SAR = 1.15

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Fig. 3

Conventional and Solar STIG cycle heat-to-electricity conversion efficiency as a function of the SAR

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Fig. 4

Conventional and Solar hybrid STIG cycle heat-to-electricity efficiency versus specific work output (kW per 1 kg/s of air, or kJ/kg)

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Fig. 5

Specific water consumption per unit work output as a function of the steam-to-air ratio

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Fig. 6

Normalized condenser heat versus the steam-to-air ratio

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Fig. 7

Normalized HRSG heat versus the steam-to-air ratio

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Fig. 8

Condenser power consumption versus the steam-to-air ratio

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Fig. 9

Temperatures of the condenser air inlet and the cooling air outlet versus the steam-to-air ratio for case B

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