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can be achieved at a temperature much lower than ambient, and high-pressure liquid CO2 ready for disposal can be withdrawn from the cycle without consuming additional power.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.

Copyright © 2006 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
Figure 1

CO2 cycle flow sheet

Grahic Jump Location
Figure 2

t-s diagram for CO2 cycle

Grahic Jump Location
Figure 3

t-Q diagram in CO2 recuperation system

Grahic Jump Location
Figure 4

t-Q diagram in LNG evaporation system

Grahic Jump Location
Figure 5

The exergy flow diagram for the base-case cycle

Grahic Jump Location
Figure 6

t-s diagram for CO2 cycle without LNG

Grahic Jump Location
Figure 7

t-s diagram for CO2 cycle with reheat

Grahic Jump Location
Figure 8

t-s diagram for CO2 cycle with intercooling

Grahic Jump Location
Figure 9

t-s diagram for CO2 cycle with intercooling and reheat

Grahic Jump Location
Figure 10

CO2 cycle flow sheet without LNG cold exergy utilization

Grahic Jump Location
Figure 11

CO2 cycle flow sheet with reheat and intercooling

Grahic Jump Location
Figure 12

The influence of Pm on thermal efficiency

Grahic Jump Location
Figure 13

The influence of Pm on exergy efficiency

Grahic Jump Location
Figure 14

The influence of Pm on specific power output




Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In