URS Group, in collaboration with the University of Texas and Trimeric Corporation, will investigate the use of concentrated piperazine (PZ) as a solvent for absorbing CO2 from coal-fired power plant flue gas while employing a novel, high-temperature, two-stage flash regeneration design. The project objectives are to quantify and validate the robustness of concentrated PZ in an integrated absorption/stripping system with solvent regeneration at 150°C; optimize the equipment design and energy performance of the two-stage flash system; and identify and resolve other potential operational and design issues including process control, corrosion, foaming, and solids precipitation. The project results will be used to evaluate the technical and economic feasibility of a full-scale implementation of this process. Previous evaluations of concentrated PZ have indicated greater than 90% capture with significant progress toward the Department of Energy’s (DOE’s) cost of electricity goal. This project continues the development of the PZ-based CO2 absorption process through field tests at the University of Texas’ Separations Research Program plant and DOE's National Carbon Capture Center.
This project focuses on mitigating capture cost and performance impacts using a concentrated PZ solvent. Concentrated PZ offers higher working capacity, thermal stability, and stripper pressure; faster CO2 absorption; and less oxidative degradation to decrease compressor requirements as well as capital and operating costs. Specifically, this project will involve bench-scale process testing followed by scale up to the 0.5 MWe scale.
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