CO2 Capture from IGCC Gas Streams Using the AC-ABC Process

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Flow diagram for the integrated AC-ABC system

Project Description

The overall project objective is to develop an innovative, low-cost CO₂-capture technology for integrated gasification combined cycle-based power plants that is based on absorption on a high-capacity and low-cost aqueous ammoniated solution. SRI, in collaboration with Bechtel Hydrocarbon Technology Solutions, Inc., is conducting a two-phase effort to develop and evaluate SRI’s Ammonium Carbonate-Ammonium Bicarbonate (AC-ABC) technology to capture CO₂ and hydrogen sulfide (H₂S) from coal-based gasification processes and Bechtel’s Pressure Swing Claus Sulfur Recovery Unit (BPSC) which will convert H₂S to elemental sulfur. The first phase tested the technology in a bench-scale batch reactor to validate the concept and determine the optimum operating conditions for a small pilot-scale reactor. The second phase will include the design and fabrication of a small pilot-scale test system and testing of the capture technology on a slipstream of real shifted syngas from the National Carbon Capture Center (NCCC) in Wilsonville, Alabama.

Project Benefits

This project focuses on developing a high-capacity aqueous ammoniated capture solvent containing ammonium carbonate (AC), which reacts with CO₂ to form ammonium bicarbonate (ABC). The system utilizes a single absorber to co-capture CO₂ and H₂S from syngas, followed by a Bechtel Pressure Swing Claus (BPSC) unit to separate the sulfur from the CO₂, increasing efficiency and reducing operating costs.

Presentations, Papers, and Publications

• CO₂ Capture from IGCC Gas Streams Using the AC-ABC Process [PDF] (Feb 2017)
  Final Report
• CO₂ Capture from IGCC Gas Streams Using the AC-ABC Process [PDF] (Aug 2016)
  Presented by Anoop Nagar, SRI International, 2016 NETL CO₂ Capture Technology Project Review Meeting, Pittsburgh, PA
  
• CO₂ Capture from IGCC Gas Streams Using the AC-ABC Process [PDF] (June 2015)
  Presented by Anoop Nagar, SRI International, 2015 NETL CO₂ Capture Technology Meeting, Pittsburgh, PA
  
• CO₂ Capture from IGCC Gas Streams Using the AC-ABC Process [PDF] (July 2014)
  Presented by Gopala Krishnan, SRI International, 2014 NETL CO₂ Capture Technology Meeting, Pittsburgh, PA
• CO₂ Capture from IGCC Gas Streams Using the AC-ABC Process [PDF] (July 2013)
  Presented by Gopala Krishnan, SRI International, 2013 NETL CO₂ Capture Technology Meeting, Pittsburgh, PA
• CO₂ Capture from IGCC Gas Streams Using the AC-ABC Process [PDF] (July 2012)
  Presented by Indira Jayaweera, SRI International, 2012 NETL CO₂ Capture Technology Meeting, Pittsburgh, PA
• CO₂ Capture from IGCC Gas Streams Using the AC-ABC Process [PDF] (August 2011)
  Presented by Indira Jayaweera, SRI International, 2011 NETL CO₂ Capture Technology Meeting, Pittsburgh, PA 
• CO₂ Capture from IGCC Gas Strams Using AC-ABC Process [PDF] (September 2010)
  Presented by Gopala Krishnan, SRI International, 2010 NETL CO₂ Capture Technology Meeting, Pittsburgh, PA
• CO₂ Capture Technology Status Sheet
• Carbon Dioxide Capture from Integrated Gasification Combined Cycle Gas Streams Using the Ammonium Carbonate-Ammonium Bicarbonate Process Fact Sheet (Dec 2010)

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