Hajnalka Kencse, Peter Mizsey<br>Comparative Study of Energy-Integrated Distillation Systems Based <br>on Exergy Analysis and Greenhouse Gas Emissions

Hajnalka Kencse, Peter Mizsey
Comparative Study of Energy-Integrated Distillation Systems Based
on Exergy Analysis and Greenhouse Gas Emissions

Abstract:

The distillation is a key separation technology for the chemical industry. Its disadvantage is the large energy consumption which involves high costs and emissions associated with the energy production. Three different energy-integrated distillation schemes are investigated: the direct sequence with backward heat-integration (DQB), fully thermally coupled distillation column (FTCDC), and sloppy distillation system with forward heat-integration (SQF). The studied distillation systems are compared to each other and to the non-integrated conventional arrangement in the case of the separation of ternary mixtures. The objective of this study is to compare the selected distillation structures based on the parameters calculated in the exergy analysis and environmental emission estimation. The energy requirement of the distillation is produced on fossil basis and the greenhouse gas emission is estimated as carbon dioxide equivalent (CO2e). The comprehensive investigation demonstrates that the heat-integrated structures, like DQB and SQF, have the lowest exergy loss, the highest energy efficiency, but the DQB shows better performance on a wider range of operation. Environmental emission can be assumed to be proportional to the energy consumption of design alternatives. The average relative emission saving is the highest in the case of the heat-integrated DQB scheme and this sequence shows the most flexible range of use. Keywords: energy-integrated distillation; exergy analysis, CO2 equivalent emission, ternary separation

Issue: 2009, Volume 60, Issue 10

Pages:

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This article is published under the Creative Commons Attribution 4.0 International License

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