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Research Papers

A Low Temperature Solar Thermochemical Power Plant With CO2 Recovery Using Methanol-Fueled Chemical Looping Combustion

[+] Author and Article Information
Hui Hong, Tao Han

Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China

Hongguang Jin1

Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, People’s Republic of Chinahgjin@mail.etp.ac.cn

1

Corresponding author.

J. Sol. Energy Eng 132(3), 031002 (Jun 04, 2010) (8 pages) doi:10.1115/1.4001467 History: Received August 19, 2009; Revised December 18, 2009; Published June 04, 2010; Online June 04, 2010

A novel solar-hybrid gas turbine combined cycle was proposed. The cycle integrates methanol-fueled chemical-looping combustion and solar thermal energy at around 200°C, and it was investigated with the aid of the energy-utilization diagram (EUD). Solar thermal energy, at approximately 150°C300°C, is utilized to drive the reduction in Fe2O3 with methanol in the reduction reactor, and is converted into chemical energy associated with the solid fuel FeO. Then it is released as high-temperature thermal energy during the oxidation of FeO in the oxidation reactor to generate electricity through the combined cycle. As a result, the exergy efficiency of the proposed solar thermal cycle may reach 58.4% at a turbine inlet temperature of 1400°C, and the net solar-to-electric efficiency would be expected to be 22.3%. The promising results obtained here indicate that this solar-hybrid combined cycle not only offers a new approach for highly efficient use of middle-and-low temperature solar thermal energy to generate electricity, but also provides the possibility of simultaneously utilizing renewable energy and alternative fuel for CO2 capture with low energy penalty.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Flow diagram of the solar-hybrid thermal cycle with methanol-fueled chemical-looping combustion

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Figure 2

Flow diagram of the integrated solar combined cycle

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Figure 3

EUD (a) for direct combustion of ISCC and (b) for the reaction of the new system

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Figure 4

EUD (a) for the heat exchanger subsystem of ISCC and (b) for the heat exchanger subsystem of the new system

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Figure 5

EUD of the power subsystem of (a) ISCC and (b) of the new system

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Figure 6

Reduction in the energy level degradation of combustion

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Figure 7

The effect of supplementary combustion on the exergy efficiency and CO2 separation

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Figure 8

Layout of the experiment on the reduction reaction of methanol and Fe2O3

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Figure 9

Cross-sectional photos of Fe2O3 by SEM

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Figure 10

Diffraction pattern of solid looping particles

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