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Research Papers: Fuel Combustion

A Transcritical CO2 Rankine Cycle With LNG Cold Energy Utilization and Liquefaction of CO2 in Gas Turbine Exhaust

[+] Author and Article Information
Wensheng Lin

Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, Chinalinwsh@sjtu.edu.cn

Meibin Huang, Hongming He, Anzhong Gu

Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China

J. Energy Resour. Technol 131(4), 042201 (Nov 12, 2009) (5 pages) doi:10.1115/1.4000176 History: Received October 03, 2008; Revised July 02, 2009; Published November 12, 2009; Online November 12, 2009

A novel transcritical Rankine cycle is presented in this paper. This cycle adopts CO2 as its working fluid with exhaust from a gas turbine as its heat source and liquefied natural gas (LNG) as its cold sink. With CO2 working transcritically, large temperature difference for the Rankine cycle is realized. Moreover, the CO2 in the gas turbine exhaust is further cooled and liquefied by LNG after transferring heat to the Rankine cycle. In this way, not only is the cold energy utilized but also a large part of the CO2 is recovered from burning of the vaporized LNG. In this paper, the system performance of this transcritical cycle is calculated. The influences of the highest cycle temperature and pressure to system specific work, exergy efficiency, and liquefied CO2 mass flow rate are analyzed. The exergy loss in each of the heat exchangers is also discussed. It turns out that this kind of CO2 cycle is energy-conservative and environment-friendly.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Layout of system

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Figure 2

T-s diagram of thermal cycle

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Figure 3

Temperature change in HEX1

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Figure 4

Temperature change in HEX2

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Figure 5

Temperature change in HEX3

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Figure 6

Temperature change in HEX4

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Figure 7

Temperature change in HEX5

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Figure 8

Effect of the highest pressure and temperature on specific work

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Figure 9

Effect of highest pressure and temperature on exergy efficiency

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Figure 10

The relation between highest pressure and mass flow rate

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