A techno-economic analysis of a novel solvent-based oxycombustion CO2 capture process

Journal Article · Wed Apr 24 04:00:00 UTC 2019 · Industrial Engineering Chemistry Research

DOI:https://doi.org/10.1021/acs.iecr.9b00305· OSTI ID:1688448

Cabral, Renato P. ^[1]; Heldebrant, David J. ^[2]; Mac Dowell, Niall ^[3]

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1. Imperial College London
2. BATTELLE (PACIFIC NW LAB)
3. VISITORS

The gas processing unit (GPU) has previously been identied as the least thermo-dynamically ecient element of an oxy-combustion process. A marginal improvementof this unit operation can provide a greater decrease of the parasitic power to the oxy-combustion process than an equivalent improvement in the air separation unit (ASU).Hence, capturing CO2 from oxy-combustion using an alternative method than the con-ventional cryogenic process has potential to reduce the parasitic power consumptionof the GPU. In this work, the authors present an initial evaluation of a new processconcept; a hybrid oxy-combustion process that uses a solvent-based GPU to captureCO2 from the ue gas. N-Ethyldiethanolamine (EDEA) is a tertiary alkanolamine that captures CO2 by forming a zwitterionic ammonium alkylcarbonate ionic liquid in theabsence of water as a co-solvent. The new solvent-based GPU proposed herein demon-strates a clear potential to improve the net power eciency by 1%, a 9% CAPEXreduction, and up to 5% LCOE reduction of an oxy-combustion process if EDEA priceis below $270/kg. Both lower CAPEX and the potential of reduced LCOE demonstratesthat alternative CO2 capture methods for oxy-combustion can be more economical.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1688448
• Report Number(s): PNNL-SA-148334
• Journal Information: Industrial Engineering Chemistry Research, Journal Name: Industrial Engineering Chemistry Research Journal Issue: 16 Vol. 58
• Country of Publication: United States
• Language: English