Engineering-scale Demonstration of the Mixed-salt Process (MSP) for CO2 Capture

Abstract

The Mixed-salt Process (MSP) developed at SRI International (SRI) is an advanced ammonia-based CO2 capture technology that represents a step change in the solvent-based, post-combustion capture technology development progression. Since 2012, the MSP technology has been tested at multiple stages—proof-of-concept level, small-bench level, and mini-pilot level—in the USA and Japan. With DOE National Energy Technology Laboratory (NETL) funding, SRI demonstrated MSP in a large bench-scale system using simulated flue gas with continuous integrated absorber and regenerator operation. This demonstration at SRI showed excellent performance. Using this large bench-scale integrated system, MSP achieved CO2 capture with high efficiency (> 90%), very high CO2 loading (> 10 wt%), a high-pressure CO2 product (>10 bar), low NH3 emissions, and low reboiler duty (2.0 to 2.3 GJ/tonne). Currently, SRI is working on a 0.5 MWe demonstration of the technology at a US host site. This paper presents the initial results from the process flowsheet modeling of the absorber system of the MSP.