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TECHNICAL PAPERS: Gas Turbines: Cycle Innovations

Proposal and Analysis of a Novel Zero CO2 Emission Cycle With Liquid Natural Gas Cryogenic Exergy Utilization

[+] Author and Article Information
Na Zhang

 Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100080, P. R. Chinazhangna@mail.etp.ac.cn

Noam Lior

Department of Mechanical Engineering and Applied Mechanics,  University of Pennsylvania, Philadelphia, PA 19104-6315

Precise determination of heat exchanger aresas requires their detailed design specification. The estimates here are very rough, based on the assumption that the heat exchangers are of the shell-and-tube type, and using average typical overall heat transfer coefficient values for these heat exchanger processes and fluids as found in the process heat transfer literature (28). Use of better heat exchangers, such as plate type, may reduce the required heat transfer area by as much as an order of magnitude.

J. Eng. Gas Turbines Power 128(1), 81-91 (May 20, 2004) (11 pages) doi:10.1115/1.2031228 History: Received November 13, 2003; Revised May 20, 2004

A novel liquefied natural gas (LNG) fueled power plant is proposed, which has virtually zero CO2 and other emissions and a high efficiency. Natural gas is fired in highly enriched oxygen and recycled CO2 flue gas. The plant operates in a quasi-combined cycle mode with a supercritical CO2 Rankine type cycle and a CO2 Brayton cycle, interconnected by the heat transfer process in the recuperation system. By coupling with the LNG evaporation system as the cycle cold sink, the cycle condensation process can be achieved at a temperature much lower than ambient, and high-pressure liquid CO2 ready for disposal can be withdrawn from the cycle without consuming additional power. Good use of the coldness exergy and internal exergy recovery produced a net energy and exergy efficiencies of a base-case cycle over 65% and 50%, respectively, which can be increased up to 68% and 54% when reheat is used. Cycle variants incorporating reheat, intercooling, and reheat+intercooling, as well as no use of LNG coldness, are also defined and analyzed for comparison. The approximate heat transfer area needed for the different cycle variants is also computed. Besides electricity and condensed CO2, the byproducts of the plant are H2O, liquid N2 and Ar.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

CO2 cycle flow sheet

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Figure 2

t-s diagram for CO2 cycle

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Figure 3

t-Q diagram in CO2 recuperation system

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Figure 4

t-Q diagram in LNG evaporation system

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Figure 5

The exergy flow diagram for the base-case cycle

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Figure 6

t-s diagram for CO2 cycle without LNG

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Figure 7

t-s diagram for CO2 cycle with reheat

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Figure 8

t-s diagram for CO2 cycle with intercooling

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Figure 9

t-s diagram for CO2 cycle with intercooling and reheat

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Figure 10

CO2 cycle flow sheet without LNG cold exergy utilization

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Figure 11

CO2 cycle flow sheet with reheat and intercooling

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Figure 12

The influence of Pm on thermal efficiency

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Figure 13

The influence of Pm on exergy efficiency

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Figure 14

The influence of Pm on specific power output

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