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RESEARCH PAPERS

# A Novel Solar-Hybrid Gas Turbine Combined Cycle With Inherent $CO2$ Separation Using Chemical-Looping Combustion by Solar Heat Source

[+] Author and Article Information
Hui Hong1

Mechanical School, University of Sciences and Technology of Beijing, Xueyuan Road, Beijing 100083, People’s Republic of Chinahonghui70@me.ustb.edu.cn

Hongguang Jin

Institute of Engineering Thermophysics, Chinese Academy of Sciences, P.O. Box 2706, Beijing 100080, People’s Republic of Chinahgjin@mail.etp.ac.cn

Baiqian Liu

Mechanical School, University of Sciences and Technology of Beijing, Xueyuan Road, Beijing 100083, People’s Republic of China

1

Corresponding author.

J. Sol. Energy Eng 128(3), 275-284 (Jan 21, 2006) (10 pages) doi:10.1115/1.2212443 History: Received September 13, 2005; Revised January 21, 2006

## Abstract

In this paper we propose a novel $CO2$-recovering hybrid solar-fossil combined cycle with the integration of methane-fueled chemical-looping combustion, and investigate the system with the aid of the Energy-Utilization Diagram (EUD). Chemical-looping combustion (CLC) consists of two successive reactions: first, methane fuel is oxidized by metal oxide(NiO)as an oxygen carrier (reduction of metal oxide); and second, the reduced metal (Ni) is successively oxidized by combustion air (the oxidation of metal). The oxidation of methane with NiO requires a relative low-grade thermal energy at $300°C–500°C$. Then concentrated solar thermal energy at approximately $450°C–550°C$ can be utilized to provide the process heat for this reaction. By coupling solar thermal energy with methane-fueled chemical-looping combustion, the energy level of solar thermal energy at around $450°C–550°C$ can be upgraded to the chemical energy of solid fuel Ni for better utilization of solar energy to generate electricity. The synergistic integration of solar thermal energy and chemical-looping combustion could make the exergy efficiency and the net solar-to-electric efficiency of the solar hybrid system more than 60% and 30%, respectively, at a turbine inlet temperature (TIT) of $1200°C$. At the same time, this new system has an extremely important advantage of directly suppressing the environmental impact due to lack of energy penalty for $CO2$ recovery. Approximately 9–15 percentage points higher efficiency can be achieved compared to the conventional natural gas-fired combined cycle with $CO2$ separation. The results obtained here are promising and indicate that this novel solar hybrid combined cycle offers the new possibility of $CO2$ mitigation using both green energy and fossil fuels. These results also provide a new approach for highly efficient use of solar thermal energy to generate electricity.

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## Figures

Figure 1

(a) Simplified flow diagram for solar hybrid system with CLC; (b) t-s diagram for solar hybrid cycle with CLC.

Figure 2

(a) Simplified diagram for ISCC; (b) t-s diagram for ISCC.

Figure 3

The exergy flow diagram for solar-hybrid cycle with CLC

Figure 4

Direct combustion of methane in ISCC

Figure 5

Reaction subsystem of SCLC-CC

Figure 6

Heat exchanger subsystem of ISCC

Figure 7

Heat exchanger subsystem of SCLC-CC

Figure 8

Power subsystem of ISCC

Figure 9

Power subsystem of solar hybrid system with CLC

Figure 10

A comparison of energy level degradation among Ni oxidation, direct combustion of CH4, and syngas combustion

Figure 11

The role of the solar thermal energy temperature in the exergy efficiency and the net solar-to-electric efficiency

Figure 12

Efficiency gain of the new system compared to a NGCC with the variation of solar thermal energy temperature

Figure 13

Variation of CO2 emission and its reduction with solar thermal energy temperature

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