Development of Mixed-Salt Technology for CO2 Capture from Coal Power Plants (Final Report)
- SRI International, Menlo Park, CA (United States); SRI International (Formally Stanford Research Institute)
- SRI International, Menlo Park, CA (United States)
- Aqueous Systems Aps (ASApS) (Denmark)
- Polytechnic Univ. of Milan (Italy)
- OLI Systems, Inc., Parsippany, NJ (United States)
- Stanford Univ., CA (United States)
SRI International (SRI), in collaboration with Stanford University, OLI Systems (OLI), Politecnico de Milano (PoliMi), and Aqueous Systems Aps (ASApS) performed a 45-month effort to develop a promising Mixed-Salt Process (MSP) for carbon dioxide capture. The MSP combines existing ammonia and potassium-carbonate technologies with improved absorption steps for rate enhancement and ammonia emission reduction and a novel selective regeneration process with a high-pressure CO2 product to introduce a new and advanced transformational solvent-based technology. The striking advantages of the SRI MSP include: low heat of reaction, high loading of CO2, high-pressure regeneration of > 99% pure dry CO2, low sensitivity to impurities, low process cost, use of a non-degradable low-cost solvent with a very low carbon footprint for its production, low emissions, and reduced water use compared to the state-of-the-art ammonia-based and amine technologies. The overall objective of the project was to develop and test a solvent-based CO2 capture technology that can capture CO2 from existing or new pulverized coal (PC) power plants at low cost. Our specific goal was to test SRI’s newly developed MSP at the large bench-scale level to demonstrate that the process could capture CO2 at high efficiency (> 90%) with very high CO2 loading (> 10 wt.%), require less than 2 GJ/tonne for solvent regeneration, and produce a CO2 stream at high pressure with a purity > 95 vol.%. This 45-month MSP development program was designed to conduct (1) extensive test campaigns with different process flowsheet variants, and (2) detailed thermodynamic, kinetic, and process modeling. These tests and models were very important to identify any issues associated with the process in the early stages and then resolve them before moving into the next scale-up (> 1 MWe scale) testing. Such an approach reduces the risks associated with the process operability at large scales and provides capital and operating expenditure (CAPEX/OPEX) predictions with improved accuracies. Under the MSP development program at SRI, we performed an aggressive testing campaign with individual subsystems as well as integrated CO2 capture and regeneration system to identify the best operating conditions. The project was carried out in two budget periods (BP1 & BP2).
- Research Organization:
- SRI International, Menlo Park, CA (United States); Aqueous Systems Aps (ASApS) (Denmark); Polytechnic Univ. of Milan (Italy); OLI Systems, Inc., Parsippany, NJ (United States); Stanford Univ., CA (United States)
- Sponsoring Organization:
- USDOE Office of Fossil Energy and Carbon Management (FECM)
- DOE Contract Number:
- FE0012959
- OSTI ID:
- 1463009
- Report Number(s):
- SRI--P22157
- Country of Publication:
- United States
- Language:
- English
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