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Research Papers: Power Engineering

Exergoeconomic Analysis of an Advanced Zero Emission Plant

[+] Author and Article Information
Fontina Petrakopoulou1

Institute for Energy Engineering, Technische Universität Berlin, Marchstraße 18, Berlin 10587, Germanyf.petrakopoulou@iet.tu-berlin.de

George Tsatsaronis, Tatiana Morosuk

Institute for Energy Engineering, Technische Universität Berlin, Marchstraße 18, Berlin 10587, Germany

1

Corresponding author.

J. Eng. Gas Turbines Power 133(11), 113001 (May 13, 2011) (12 pages) doi:10.1115/1.4003641 History: Received May 04, 2010; Revised January 12, 2011; Published May 13, 2011; Online May 13, 2011

In this paper, an advanced zero emission plant using oxy-fuel combustion is presented and compared with a reference plant (a) without CO2 capture and (b) with CO2 capture via chemical absorption. A variation of the oxy-fuel plant with a lower CO2 capture percentage (85%) is also presented, in order to (1) evaluate the influence of CO2 capture on the overall performance and cost of the plant and (2) enable comparison at the plant-level with the conventional method for CO2 capture: chemical absorption with monoethanolamine. Selected results of an advanced exergetic analysis are also briefly presented to provide an overview of further development of evaluation methodologies, as well as deeper insight into power plant design. When compared with the reference case, the oxy-fuel plants with 100% and 85% CO2 captures suffer only a relatively small decrease in efficiency, essentially due to their more efficient combustion processes that make up for the additional thermodynamic inefficiencies and energy requirements. Investment cost estimates show that the membrane used for the oxygen production in the oxy-fuel plants is the most expensive component. If less expensive materials can be used for the mixed conducting membrane reactor used in the plants, the overall plant expenditures can be significantly reduced. Using the results of the exergoeconomic analysis, the components with the higher influence on the overall plant are revealed and possible changes to improve the plants are suggested. Design modifications that can lead to further decreases in the costs of electricity and CO2 capture, are discussed in detail. Overall, the calculated cost of electricity and the cost of avoided CO2 from the oxy-fuel plants are calculated to be competitive with those of chemical absorption.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Structure of the reference plant

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Figure 3

Structure of the AZEP 100

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Figure 4

Structure of the AZEP 85

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Figure 5

Sensitivity analysis of the investment cost of the MCM reactor

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