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SRI International, in collaboration with OLI Systems, Inc., Aqueous Systems ApS, Politecnico di Milano (POLIMI), and Stanford University, will advance the development of a novel ammonia-based mixed-salt solvent process for carbon dioxide (CO2) capture from coal-fired power plants by designing and testing a bench-scale (approximately 100 kW) CO2 capture system. The mixed-salt technology combines ammonium and potassium carbonates for enhanced CO2 capture efficiency, high CO2 loading capacity, and reduced energy consumption. The high operating pressure of the solvent regenerator also has the potential to reduce the CO2 compression costs. The technology consists of a two-stage absorber system with a single stage regenerator. To improve process performance, the absorber conditions will be optimized using two individual absorbers before testing the single two-stage absorber. Individual absorber and regenerator tests will be performed in a semi-continuous mode to collect data on solvent concentration, CO2 capture efficiency, water usage, and ammonia loss. Bench-scale testing of the continuous, integrated two-stage absorber system will be performed using simulated flue gas. Data collected will be used to complete thermodynamic modeling and a techno-economic analysis for integration of the mixed-salt technology into a full-scale power plant.

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Mixed-salt CO2 capture system
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Principal Investigator
Indira Jayaweera
indira.jayaweera@sri.com
Project Benefits

SRI’s mixed-salt process uses known solvents in a new way that increases process efficiency, minimizes energy requirements, and reduces capital and operating costs, which improve the economics of carbon capture. This project will make progress toward the U.S. Department of Energy’s (DOE) overall Carbon Capture Program performance goals of 90 percent CO2 capture rate with 95 percent CO2 purity at a cost of $40/tonne of CO2 captured by 2025.

Project ID
FE0012959
Website
SRI International
http://www.sri.com/