CO{sub 2} sequestration from IGCC power plants by means of metallic membranes

Journal Article · Mon Jan 15 04:00:00 EST 2007 · Journal of Engineering for Gas Turbines and Power

DOI:https://doi.org/10.1115/1.2181184· OSTI ID:20862296

Chiesa, P; Kreutz, T G; Lozza, G G ^[1]

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1. Politecn Milan, Milan (Italy)

This paper investigates novel IGCC plants that employ hydrogen separation membranes in order to capture carbon dioxide for long-term storage. The thermodynamic performance of these membrane-based plants are compared with similar IGCCs that capture CO{sub 2} using conventional (i.e., solvent absorption) technology. The basic plant configuration employs an entrained-flow, oxygen-blown coal gasifier with quench cooling, followed by an adiabatic water gas shaft (WGS) reactor that converts most of CO contained in the syngas into CO{sub 2} and H{sub 2}. The syngas then enters a WGS membrane reactor where the syngas undergoes further shifting; simultaneously, H{sub 2} in the syngas permeates through the hydrogen-selective, dense metal membrane into a counter-current nitrogen 'sweep' flow. The permeated H{sub 2}, diluted by N{sub 2}, constitutes a decarbonized fuel for the combined cycle power plant whose exhaust is CO{sub 2} free. Exiting the membrane reactor is a hot, high pressure 'raffinate' stream composed primarily of CO{sub 2} and steam, but also containing 'fuel species' such as H{sub 2}S, unconverted CO, and unpermeated H{sub 2}. Two different schemes (oxygen catalytic combustion and cryogenic separation) have been investigated to both exploit the heating value of the fuel species and produce a CO{sub 2}-rich stream for long term storage. Our calculations indicate that, when 85 vol % of the H{sub 2}+CO in the original syngas is extracted as H{sub 2} by the membrane reactor, the membrane-based IGCC systems are more efficient by about to 1.7 percentage points than the reference IGCC with CO{sub 2} capture based on commercially ready technology.

• OSTI ID: 20862296
• Journal Information: Journal of Engineering for Gas Turbines and Power, Journal Name: Journal of Engineering for Gas Turbines and Power Journal Issue: 1 Vol. 129; ISSN JETPEZ; ISSN 0742-4795
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
ABSORPTION
CAPTURE
CARBON DIOXIDE
COAL GASIFICATION
COMBINED-CYCLE POWER PLANTS
COMPARATIVE EVALUATIONS
HYDROGEN
MEMBRANES
ORGANIC SOLVENTS
SEPARATION PROCESSES