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 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 shift (WGS) reactor that converts most of CO contained in the syngas into and . The syngas then enters a WGS membrane reactor where the syngas undergoes further shifting; simultaneously, in the syngas permeates through the hydrogen-selective, dense metal membrane into a counter-current nitrogen “sweep” flow. The permeated , diluted by , constitutes a decarbonized fuel for the combined cycle power plant whose exhaust is free. Exiting the membrane reactor is a hot, high pressure “raffinate” stream composed primarily of and steam, but also containing “fuel species” such as , unconverted CO, and unpermeated . 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 -rich stream for long term storage. Our calculations indicate that, when of the in the original syngas is extracted as by the membrane reactor, the membrane-based IGCC systems are more efficient by percentage points than the reference IGCC with capture based on commercially ready technology.
CO2 Sequestration From IGCC Power Plants by Means of Metallic Membranes
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Chiesa, P., Kreutz, T. G., and Lozza, G. G. (September 6, 2005). "CO2 Sequestration From IGCC Power Plants by Means of Metallic Membranes." ASME. J. Eng. Gas Turbines Power. January 2007; 129(1): 123–134. https://doi.org/10.1115/1.2181184
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