Abstract
Cryogenic air separation is an energy-intensive process with a large carbon footprint that accounts for approximately 2% of total carbon emissions by a country and contributes significantly to global warming. The heat-integrated air separation column (HIASC) is an improved structure for the air separation process with considerable potential for carbon footprint reduction. Three heat-integration schemes are therefore modeled and investigated for HIASC, including the standard fully integrated scheme (F-HIASC), the scheme with vertical relative movement of columns (M-HIASC), and the partially integrated scheme (P-HIASC). Optimization of the structure parameters to obtain the minimum carbon footprint is carried out. The results are further analyzed and compared to the conventional air separation column (CASC). An economic evaluation based on total annual costs is conducted for these schemes to properly assess their benefits. P-HIASC is the most environmentally friendly and cost-saving structure among the three schemes, achieving a 46.7% carbon footprint reduction and 32.4% total annual cost saving compared to CASC.
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