Simulation of a Process to Capture CO2 From IGCC Syngas Using a High Temperature PBI Membrane

Gopala Krishnan, Daniel Steele, Kevin O'Brien, Richard Callahan, Kathryn Berchtold, Jose Figueroa

Research output: Contribution to journalConference articlepeer-review

Abstract

Capture of carbon dioxide from an advanced integrated gasification combined-cycle (IGCC) process offers several technical and economic advantages over the conventional coal-combustion systems. The pre-combustion gas stream is at high pressure, has low volumetric flow rates and is capable of producing relatively pure hydrogen for conversion into electricity by gas turbines or fuel cells without generating additional carbon dioxide. Polybenzimidazole (PBI) polymer shows promise as a high temperature membrane material for pre-combustion-based capture of CO2 from IGCC gas streams. We are developing a process that is based on PBI membrane to achieve a capture of 90% CO2 as a high pressure stream with about 10% increase in the cost of energy. A significant advantage of the PBI membrane compared to other sorbent-based technologies and conventional polymeric membranes is that PBI membrane is capable of operating at over a broader temperature range (∼100-400 {ring operator}C). In contrast, solvent-based processes such as Selexol require syngas cooling prior to treatment, followed by reheating the processed fuel gas stream. In this paper, we are presenting the preliminary results of a process simulation using the ASPEN program under several scenerios including the IGCC with no CO2 capture, IGCC with Selexol, and IGCC with PBI membrane separator. The high temperature membrane-based CO2 capture method compares favorably against the Selexol-based CO2 capture method. If H2S remains with the CO2 stream and can be sequestered, then the cost of electricity appears to be lower than Selexol-bsed separation systems.

Original languageEnglish (US)
Pages (from-to)4079-4088
Number of pages10
JournalEnergy Procedia
Volume1
Issue number1
DOIs
StatePublished - Feb 2009
Externally publishedYes
Event9th International Conference on Greenhouse Gas Control Technologies, GHGT-9 - Washington DC, United States
Duration: Nov 16 2008Nov 20 2008

Keywords

  • Carbon Capture
  • IGCC
  • Membrane
  • Polybenzimidazole
  • Type your keywords here, separated by semicolons

ASJC Scopus subject areas

  • Energy(all)

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