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Research Papers: Gas Turbines: Cycle Innovations

Performance and Cost Analysis of Advanced Gas Turbine Cycles With Precombustion CO2 Capture

[+] Author and Article Information
Stéphanie Hoffmann, Michael Bartlett, Matthias Finkenrath

General Electric, Global Research Center, D-85748 Garching Bei München, Germany

Andrei Evulet

General Electric, Global Research Center, Niskayuna, NY 12309

Tord Peter Ursin

StatoilHydro, Technology and New Energy, N-4035 Stavanger, Norway

J. Eng. Gas Turbines Power 131(2), 021701 (Dec 23, 2008) (7 pages) doi:10.1115/1.2982147 History: Received April 01, 2008; Revised May 26, 2008; Published December 23, 2008

This paper presents the results of an evaluation of advanced combined cycle gas turbine plants with precombustion capture of CO2 from natural gas. In particular, the designs are carried out with the objectives of high efficiency, low capital cost, and low emissions of carbon dioxide to the atmosphere. The novel cycles introduced in this paper are comprised of a high-pressure syngas generation island, in which an air-blown partial oxidation reformer is used to generate syngas from natural gas, and a power island, in which a CO2-lean syngas is burnt in a large frame machine. In order to reduce the efficiency penalty of natural gas reforming, a significant effort is spent evaluating and optimizing alternatives to recover the heat released during the process. CO2 is removed from the shifted syngas using either CO2 absorbing solvents or a CO2 membrane. CO2 separation membranes, in particular, have the potential for considerable cost or energy savings compared with conventional solvent-based separation and benefit from the high-pressure level of the syngas generation island. A feasibility analysis and a cycle performance evaluation are carried out for large frame gas turbines such as the 9FB. Both short-term and long-term solutions have been investigated. An analysis of the cost of CO2 avoided is presented, including an evaluation of the cost of modifying the combined cycle due to CO2 separation. The paper describes a power plant reaching the performance targets of 50% net cycle efficiency and 80% CO2 capture, as well as the cost target of 30$ per ton of CO2 avoided (2006 Q1 basis). This paper indicates a development path to this power plant that minimizes technical risks by incremental implementation of new technology.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Base line concept for precombustion CO2 capture

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Figure 2

Advanced concept for precombustion CO2 capture

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Figure 3

Example of CO2 separation membrane operating conditions in the advanced concept

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