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Improving specific power consumption of cryogenic air separation plants using waste heat of carbon capture power plants.

Number: pap. 0032

Author(s) : SINGLA R., CHOWDHURY K.

Summary

A cryogenic air separation unit (ASU) with double column configuration produces pressurized oxygen (PGOX) at purity of 99.6% and above. A single column configuration is sufficient to produce at a purity of 95%, which is required for carbon capture power plants (CCPP). It requires less capital and consumes lower power than a double column configuration. It further makes an economic sense if the unutilized bone-dry low purity (waste) nitrogen, also called pressurised impure gaseous nitrogen (PiGAN), may be heated by the waste heat available in CCPP. It is expanded in a gas-based reheat cycle to produce electricity. This may partially
offset the power consumed in the ASU. Using exergy analysis, pressure of PiGAN is determined in such a way that the net power consumed by ASU (power consumed minus power generation in power cycle) is minimized. At this pressure of PiGAN, single column ASU consumes 12.5% less power than double column ASU.

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Pages: 8

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Details

  • Original title: Improving specific power consumption of cryogenic air separation plants using waste heat of carbon capture power plants.
  • Record ID : 30025761
  • Languages: English
  • Source: Cryogenics 2019. Proceedings of the 15th IIR International Conference: Prague, Czech Republic, April 8-11, 2019.
  • Publication date: 2019/05/08
  • DOI: http://dx.doi.org/10.18462/iir.cryo.2019.0032

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