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Research Papers: Energy Storage/Systems

Thermo-Economic Evaluation of Novel Flexible CAES/CCPP Concept

[+] Author and Article Information
Stephan Herrmann

Institute for Energy Systems,
Technische Universität München,
Garching bei München 85748, Germany
e-mail: stephan.herrmann@tum.de

Steffen Kahlert

Mem. ASME
Institute for Energy Systems,
Technische Universität München,
Garching bei München 85748, Germany
e-mail: steffen.kahlert@tum.de

Manuel Wuerth

Institute for Energy Systems,
Technische Universität München,
Garching bei München 85748, Germany
e-mail: manuel.wuerth@tum.de

Hartmut Spliethoff

Institute for Energy Systems,
Technische Universität München,
Garching bei München 85748, Germany
e-mail: spliethoff@tum.de

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received June 28, 2016; final manuscript received November 28, 2016; published online January 9, 2017. Assoc. Editor: Mohamed A. Habib.

J. Energy Resour. Technol 139(1), 011902 (Jan 09, 2017) (10 pages) Paper No: JERT-16-1271; doi: 10.1115/1.4035424 History: Received June 28, 2016; Revised November 28, 2016

This paper presents the results of a thermodynamic and economic evaluation of a novel hybrid combination of a compressed air energy storage (CAES) and a combined cycle power plant (CCPP). The new cycle is modeled on the basis of a GE LM6000 gas turbine model, an adiabatic compressor model, an air expander, and a conventional dual-pressure heat recovery steam generator (HRSG) configuration. Furthermore, a detailed design of the recuperator is presented. With the simulated components, a storage efficiency of 60% is reached. In combined heat and power (CHP) configuration, the total efficiency of the plant reaches up to 86.2%. The thermodynamic and economic performance is compared to a conventional LM6000 combined cycle. For the economic evaluation, the German electricity day-ahead prices and average gas price of the year 2014 are used. Overall, it is found that the CAES/CCPP concept exhibits far more operation hours per year and a higher profit margin than the compared CCPP. Taking into account the investment and operational costs, especially with steam extraction, the net present value (NPV) of the novel cycle is higher than that of the combined cycle, despite the challenging market environment for storage technologies in Germany.

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References

Figures

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Fig. 1

CAES/CCPP plant in charge mode

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Fig. 2

CAES/CCPP plant in discharge mode

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Fig. 3

CAES/CCPP plant in combined cycle mode

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Fig. 4

Booster compressor and aftercooler

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Fig. 5

Exergy flows during a full charge/discharge cycle with steam extraction

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Fig. 6

Comparison of the operation behavior of the CAES/CCPP and the CCPP in the first week of January 2014

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Fig. 7

Comparison of the operation behavior of the CAES/CCPP and the CCPP with steam extraction in the first week of January 2014

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Fig. 8

Exemplary evolution of the net present value for the CAES/CCPP and the CCPP

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Fig. 9

Exemplary evolution of the net present value for the CAES/CCPP and CCPP with constant steam extraction

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Fig. 10

Exemplary evolution of the net present value for the CAES/CCPP and CCPP with constant steam extraction and incentives

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Fig. 11

Heat demand curve and heat supply covered by the CAES/CCPP or CCPP

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Fig. 12

Exemplary evolution of the net present value for the CAES/CCPP and CCPP with varying heat supply and incentives

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Fig. 13

Results of the parameter study for the different cases shown in Table 10 for constant steam extraction

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Fig. 14

Results of the parameter study for the different cases shown in Table 10 for varying heat supply

Tables

Errata

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