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• W2074954001 abstract "Oxy-combustion is a competitive technology to capture CO2. Current air separation technologies for high volume O2 production are based on cryogenic distillation. When a double-column distillation cycle is applied to produce O2 with a purity of 95 mol%, the oxygen production process is causing the largest power penalty (6.6% points) related to CO2 capture. The actual power consumption is around 4.7 times the theoretical minimum. This paper describes a comprehensive exergy analysis of an air separation unit for producing O2 with low purity (95 mol%) and low pressure (120 kPa). The air compression process and the distillation system cause the two largest exergy losses: 38.4% and 28.2% respectively. The power consumption in the air compressor can be reduced by 19% if the isentropic efficiency increases from 0.74 to 0.9. The total power consumption is reduced by 10% when dual reboilers are applied in the lower pressure column. The exergy losses in the condenser/reboiler exchanger is responsible for only 6.3% of the total losses, thus the power saving potential by developing new heat exchangers with smaller temperature differences is limited. The plant performance in air separation units is not expected to be significantly improved unless the flowsheet structures are improved." @default.
• W2074954001 created "2016-06-24" @default.
• W2074954001 creator A5013516597 @default.
• W2074954001 creator A5043784239 @default.
• W2074954001 date "2012-08-01" @default.
• W2074954001 modified "2023-10-17" @default.
• W2074954001 title "Using exergy analysis to reduce power consumption in air separation units for oxy-combustion processes" @default.
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• W2074954001 doi "https://doi.org/10.1016/j.energy.2012.01.065" @default.
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