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Research Papers: Fuel Combustion

An Advanced Power-Generation System With CO2 Recovery Integrating DME Fueled Chemical-Looping Combustion

[+] Author and Article Information
Tao Han, Chuanqiang Zhang

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

Hui Hong1

Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, People’s Republic of Chinahonghui70@yahoo.com.cn

Hongguang Jin

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

1

Corresponding author.

J. Energy Resour. Technol 133(1), 012201 (Feb 23, 2011) (7 pages) doi:10.1115/1.4003441 History: Received July 23, 2010; Revised January 08, 2011; Published February 23, 2011; Online February 23, 2011

Dimethyl ether (DME) is a promising alternative fuel, but direct combustion of DME will result in extra energy penalty for CO2 separation. In this paper, an advanced power-generation system with CO2 recovery integrating DME fueled chemical-looping combustion is proposed. In the reduction reactor, DME is oxidized by Fe2O3 into CO2 and H2O, and Fe2O3 is reduced into FeO simultaneously. Since the endothermic reduction in Fe2O3 with DME requires relatively low-grade thermal energy around 180°C, waste heat is used to provide the reaction heat. FeO is oxidized into Fe2O3 by air in the oxidation reactor, producing high-temperature flue gas to generate electricity through a thermal cycle. The gas production from the fuel reactor only consists of CO2 and H2O, so CO2 can be easily separated through condensing with no extra energy penalty. As a result, the thermal efficiency could be expected to be 58.6% at a turbine inlet temperature of 1288°C. This proposed system may provide a new approach for high efficient use of DME in the industrial fields, and offer a possibility of chemical-looping combustion with inherent CO2 capture for the alternative fuel.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Variation of conversion with reduction temperature and pressure

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Figure 2

Simplified diagram of the advanced power-generation system with DME fueled chemical-looping combustion

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Figure 3

Simplified diagram of the DME fueled combined cycle

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Figure 4

(a) EUD for direct combustion of the reference system. (b) EUD for chemical-looping combustion of the proposed system.

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Figure 5

(a) EUD for the heat exchanger subsystem of the reference system. (b) EUD for the heat exchanger subsystem of the proposed system.

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Figure 6

(a) EUD of the power subsystem of the reference system. (b) EUD of the power subsystem of the proposed system.

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Figure 7

Reduction in energy level degradation of combustion

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Figure 8

Variation of thermal efficiency with Fe2O3 temperature

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Figure 9

The variation of system efficiency with redox stability

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