Zero-emission combined power cycle using LNG cold

Sanjayan Velautham, Takehiro Ito, Yasuyuki Takata

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

A potential zero emission combined power generation plant fired by liquefied natural gas (LNG) has been investigated. A mixture of carbon dioxide (CO2)-steam is used as the working fluid of a gas turbine cycle, which replaces the normal combustion-in-air products and air, notably as the thermal ballast for the control of flame temperature. Oxygen (O2) is used as the fuel oxidant and is obtained from an air separation unit (ASU). The excess CO2 due to combustion is extracted by a simple flow separator and liquefied ready to be reused and/or sequestered. The plant configuration and thermodynamics of the cycle are discussed first and then the optimised overall efficiency of the plant is calculated with a comparison of 100% and 120% stoichiometric combustion. The overall net efficiency, optimised to pressure and temperature levels complying with the material and cooling techniques currently available, is around 56% (LHV basis), including the energy penalty of the ASU and the CO2 separation.

Original languageEnglish
Pages (from-to)668-674
Number of pages7
JournalJSME International Journal, Series B: Fluids and Thermal Engineering
Volume44
Issue number4
DOIs
Publication statusPublished - Nov 1 2001

Fingerprint

liquefied natural gas
Liquefied natural gas
cycles
air
Air
ballast
flame temperature
working fluids
gas turbines
Steam
separators
Separators
penalties
Oxidants
Carbon Dioxide
steam
Power generation
Gas turbines
carbon dioxide
Carbon dioxide

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Fluid Flow and Transfer Processes
  • Physical and Theoretical Chemistry

Cite this

Zero-emission combined power cycle using LNG cold. / Velautham, Sanjayan; Ito, Takehiro; Takata, Yasuyuki.

In: JSME International Journal, Series B: Fluids and Thermal Engineering, Vol. 44, No. 4, 01.11.2001, p. 668-674.

Research output: Contribution to journalArticle

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