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Research Papers: Gas Turbines: Cycle Innovations

An Innovative Gas Turbine Cycle With Methanol-Fueled Chemical-Looping Combustion

[+] Author and Article Information
Hongguang Jin

Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100039, Chinahgjin@mail.etp.ac.cn

Xiaosong Zhang

Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100080, China; Graduate University of the Chinese Academy of Sciences, Beijing 100080, China

Hui Hong, Wei Han

Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100080, China

J. Eng. Gas Turbines Power 131(6), 061701 (Jul 17, 2009) (8 pages) doi:10.1115/1.3098418 History: Received November 10, 2008; Revised December 10, 2008; Published July 17, 2009

In this paper, a novel gas turbine cycle integrating methanol decomposition and the chemical-looping combustion (CLC) is proposed. Two types of methanol-fueled power plants, including the new gas turbine cycle with CLC combustion and a chemically intercooled gas turbine cycle, have been investigated with the aid of the T-Q diagram. In the proposed system, methanol fuel is decomposed into syngas mainly containing H2 and CO by recovering low-temperature thermal energy from an intercooler of the air compressor. After the decomposition of methanol, the resulting product of syngas is divided into two parts: the part reacting with Fe2O3 is sent into the CLC subsystem, and the other part is introduced into a supplement combustor to enhance the inlet temperatures of the gas turbine to 11001500°C. As a result, the new methanol-fueled gas turbine cycle with CLC had a breakthrough in thermodynamic and environmental performance. The thermal efficiency of the new system can achieve 60.6% with 70% of CO2 recovery at a gas turbine inlet temperature of 1300°C. It would be expected to be at least about 10.7 percentage points higher than that of the chemically intercooled gas turbine cycle with the same recovery of CO2 and is environmentally superior due to the recovery of CO2. The promising results obtained here indicated that this novel gas turbine cycle with methanol-fueled chemical-looping combustion could provide a promising approach of both effective use of alternative fuel and recovering low-temperature waste heat and offer a technical probability of blending a combination of the chemical-looping combustion and the advanced gas turbine for carbon capture and storage.

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Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

The flow diagram of the new system

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Figure 2

A simplified diagram for the chemically intercooled gas turbine combined cycle

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Figure 3

T-Q diagram of CH4O evaporation and decomposition

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Figure 4

T-Q diagram of heat recovery

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Figure 5

T-Q diagram of HRSG

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Figure 6

Sketch map of the CLC combustion

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Figure 7

Variation in the exergy destruction of the cycle with reduction temperature

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Figure 8

Variation of thermal efficiency with TIT and π

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Figure 9

Cross-sectional photos of particles (a) before reaction and (b) after reaction

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