This project will exploit the availability of CO2 in a gasification power island for the benefit of IGCC-CCS integrated plants. EPRI will leverage the findings of laboratory tests to support the development and evaluation of mechanical engineering designs of LRC/LCO2 slurry preparation systems, which in turn will be used to develop higher resolution IGCC plant performance and cost models. The project aims to validate that LCO2 can achieve higher solid loading than water slurry, study the design criteria for a LCO2-coal slurry preparation/mixing system that is superior to conventional feed systems, and demonstrate potential plant thermal efficiency improvement over a water-coal slurry-based feed system.
There is increased interest in carbon capture and storage (CCS) for future coal-based power plants, and in a CCS integrated gasification plant, relatively pure, high pressure CO2 stream(s) will be available within the power plant. Electric Power Research Institute (EPRI) aims to help reduce the cost and improve the efficiency of integrated gasification combined cycle (IGCC) with CCS by using a portion of the high purity CO2 product stream as the carrier fluid to feed low rank coal (LRC) into the gasifier.
EPRI proposes to confirm the potential advantages of LRC/liquid carbon dioxide (LCO2) slurries by:
- Conducting plant-wide technical and economic simulations.
- Developing a preliminary design and cost estimate of an LRC/LCO2 slurry preparation and mixing system.
- Performing laboratory tests for increasing the knowledge and understanding of maximum solids loading capability for three coals, including North Dakota Beulah-Zap Lignite, Montana Rosebud Power River Basin (PRB) coal, and Illinois No. 6 (Herrin).
- Defining a technology development roadmap through commercialization.
The outcome of the design effort will help lead the way to integrating LRC/LCO2 slurry feed systems into future systems for prototype testing at an IGCC with CCS power plant. The successful completion of the project will also lead to:
- Confirmation of plant-wide performance and cost advantages for IGCC with CCS applications.
- Acquisition of first-of-a-kind rheology data including viscosity and solids loading measurements, which are required to determine pressure drops, onset of turbulence, and agglomerate breakup of coal particles in LRC/LCO2 slurries for designing and sizing equipment for large-scale industrial applications.
- Technical development and cost-evaluation of conceptual designs of LRC/LCO2 slurry preparation and mixture systems.
- Identification of specific tests and field demonstrations critical to move the technology forward towards commercialization.
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