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Publication Title | CONFIGURATION ANALYSIS OF A NOVEL ZERO CO2 EMISSION CYCLE WITH LNG CRYOGENIC EXERGY UTILIZATION

Organic Rankine Cycle

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Proceedings of IMECE’03 2003 ASME International Mechanical Engineering Congress & Exposition Washington, D.C., November 16-21, 2003

IMECE2003-41958

CONFIGURATION ANALYSIS OF A NOVEL ZERO CO2 EMISSION CYCLE WITH LNG CRYOGENIC EXERGY UTILIZATION

Na Zhang*

Institute of Engineering Thermophysics, Chinese Academy of Sciences Beijing 100080, P. R. China

Noam Lior

Department of Mechanical Engineering and Applied Mechanics University of Pennsylvania

Philadelphia, PA 19104-6315, USA

ABSTRACT

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-like 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can be achieved at a temperature much lower than ambient, and high-pressure liquid CO2 ready for disposal can be withdrawn from the cycle without consuming additional power. The net thermal and exergy efficiencies of a base-case cycle are found to be 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.

Keywords: Thermal cycle, near-zero CO2 emission, LNG cryogenic exergy

NOMENCLATURE

A Heat exchanger surface area [m2]

* Corresponding author: Phone: +86 10 62561887 Fax: +86 10 62575913 E-mail: zhangna@mail.etp.ac.cn

1

e Specific exergy [kJ/kg] G Mass flow rate [kg/s]

Hu Fuel LHV value [kJ/kg] h Specific enthalpy [kJ/kg] P Pressure [bar]

Rg Mass flow rate ratio of Brayton cycle [%], Eq. (4) T Temperature [K]

t Temperature [°C]

s

Specific entropy [kJ/kg⋅K] Q Heat duty [MW]

U Overall heat transfer coefficient [W/m2⋅K] W Power output [MW]

w Specific power output [kJ/kg]

∆TP Pinch point temperature difference [°C]

η1 Thermal efficiency

η2 Exergy efficiency

Subscripts

f Fuel

h High pressure

m Intermediary pressure

L Liquefied natural gas

l Low pressure

1...30 States on the cycle flow sheet

Image | CONFIGURATION ANALYSIS OF A NOVEL ZERO CO2 EMISSION CYCLE WITH LNG CRYOGENIC EXERGY UTILIZATION



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