Zero emission gas turbine-steam turbine combined cycle with low-pressure gas turbine exhaust

S. Velautham, T. Ito, Y. Takata

Research output: Contribution to journalArticlepeer-review


A potential zero emission power generating combined cycle with a gas turbine(GT) exhaust well below the atmospheric pressure, around 0.1 bar, has been investigated. A mixture of carbon dioxide (CO2)-steam is used as the working fluid of a gas turbine(topper) cycle, which replaces the normal combustion-in-air products, notably as the thermal ballast for the control of flame temperature. Oxygen (O2) from an air separation unit (ASU) is used as the fuel oxidant. 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 thermodynamic features are discussed first and then the optimised overall efficiency of the plant is calculated with 100% and 120% stoichiometric O2. Considering all the auxiliary power consumption by air separation and CO2 liquefaction, the overall net efficiency optimised to pressure and temperature levels complying with materials and cooling techniques currently available, is around 57% on a LHV basis, when fuelled by liquefied natural gas (LNG).

Original languageEnglish
Pages (from-to)59-75
Number of pages17
JournalMemoirs of the Graduate School of Engineering, Kyushu University
Issue number2
Publication statusPublished - Jun 2000

All Science Journal Classification (ASJC) codes

  • General Energy
  • Process Chemistry and Technology
  • Atmospheric Science
  • Management of Technology and Innovation
  • General Earth and Planetary Sciences


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