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Energies 2016, 9(9), 669; doi:10.3390/en9090669

Comprehensive Exergy Analysis of Three IGCC Power Plant Configurations with CO2 Capture

National Energy Technology Laboratory, USA Development of Energy, Pittsburgh, PA 15025, USA
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Academic Editor: Fernando Rubiera González
Received: 11 June 2016 / Revised: 28 July 2016 / Accepted: 12 August 2016 / Published: 24 August 2016
(This article belongs to the Special Issue Exergy Analysis of Energy Systems)
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Abstract

We have conducted comprehensive exergy analyses of three integrated gasification combined cycle with carbon capture and storage (IGCC-CCS) power plant configurations: (1) a baseline model using Selexol™ for H2S/CO2 removal; (2) a modified version that adds a H2-selective membrane before the Selexol™ acid gas removal system; and (3) a modified baseline version that uses a CO2-selective membrane before the Selexol™ acid gas removal system. While holding the coal input flow rate and the CO2 captured flow rates constant, it was determined that the H2-selective membrane case had a higher net power output (584 MW) compared to the baseline (564 MW) and compared to the CO2-selective membrane case (550 MW). Interestingly, the CO2-selective membrane case destroyed the least amount of exergy within the power plant (967 MW), compared with the Baseline case (999 MW) and the H2-membrane case (972 MW). The main problem with the CO2-selective membrane case was the large amount of H2 (48 MW worth of H2 chemical exergy) remaining within the supercritical CO2 that exits the power plant. Regardless of the CO2 capture process used, the majority of the exergy destruction occurred in the gasifier (305 MW) and gas turbine (~380 MW) subsystems, suggesting that these two areas should be key areas of focus of future improvements. View Full-Text
Keywords: exergy analysis; coal gasification; precombustion CO2 capture; process system modeling exergy analysis; coal gasification; precombustion CO2 capture; process system modeling
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Siefert, N.S.; Narburgh, S.; Chen, Y. Comprehensive Exergy Analysis of Three IGCC Power Plant Configurations with CO2 Capture. Energies 2016, 9, 669.

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