Improving the exergy efficiency of a cryogenic air separation unit as part of an integrated gasification combined cycle
article
The efficiency of a two-column cryogenic ASU (air separation unit) that is part of an IGCC (integrated gasification combined cycle) can be increased significantly by making better use of the heat of compression and by improving the heat integration of the distillation columns. The rational exergy efficiency of the ASU, which is defined as the desired increase in exergy content of the products divided by the amount of work that is added to the process, can be increased from 35% to over 70%. The exergy destruction per amount of feed is reduced with 1.6 kJ/mol air, corresponding to a 0.74% increase in the net electric efficiency of the IGCC. The efficiencies are expected to increase even further because the full potential of using heat-integrated distillation columns is not yet achieved. © 2012 Elsevier Ltd. All rights reserved.
Topics
Cryogenic air separationExergy efficiencyHeat-integrated distillation columnsIntegrated gasification combined cycleAir separation unitCryogenic air separationElectric efficiencyExergy destructionsExergy efficienciesHeat integrationHeat-integrated distillation columnsIntegrated gasification combined cycleCryogenicsEfficiencyExergyGasificationIntegrationSeparationDistillation columns
TNO Identifier
954350
ISSN
01968904
Source
Energy Conversion and Management, 61, pp. 31-42.
Pages
31-42
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