Zero-emission combined power cycle using LNG cold

Sanjayan Velautham; Takehiro Ito; Yasuyuki Takata

doi:10.1299/jsmeb.44.668

Zero-emission combined power cycle using LNG cold

Sanjayan Velautham, Takehiro Ito, Yasuyuki Takata

Thermal Engineering

Research output: Contribution to journal › Article › peer-review

10 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 language	English
Pages (from-to)	668-674
Number of pages	7
Journal	JSME International Journal, Series B: Fluids and Thermal Engineering
Volume	44
Issue number	4
DOIs	https://doi.org/10.1299/jsmeb.44.668
Publication status	Published - Nov 2001

All Science Journal Classification (ASJC) codes

Mechanical Engineering
Physical and Theoretical Chemistry
Fluid Flow and Transfer Processes

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Cite this

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title = "Zero-emission combined power cycle using LNG cold",

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.",

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AU - Ito, Takehiro

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Zero-emission combined power cycle using LNG cold

Abstract

All Science Journal Classification (ASJC) codes

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