This paper presents the results of an evaluation of advanced combined cycle gas turbine plants with pre-combustion 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 POX 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 to 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. This paper indicates a development path to this power plant that minimizes technical risks by incremental implementation of new technology.
- International Gas Turbine Institute
Performance and Cost Analysis of Advanced Gas Turbine Cycles With Pre-Combustion CO2 Capture
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Hoffmann, S, Bartlett, M, Finkenrath, M, Evulet, A, & Ursin, TP. "Performance and Cost Analysis of Advanced Gas Turbine Cycles With Pre-Combustion CO2 Capture." Proceedings of the ASME Turbo Expo 2008: Power for Land, Sea, and Air. Volume 2: Controls, Diagnostics and Instrumentation; Cycle Innovations; Electric Power. Berlin, Germany. June 9–13, 2008. pp. 663-671. ASME. https://doi.org/10.1115/GT2008-51027
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