Sandia公司先进SCO2布雷顿循环换热器的研究进展.pdf

Photos placed in horizontal position with even amount of white space between photos and header Sandia Progress on Advanced Heat Exchangers for SCO2 Brayton Cycles The 4th International Symposium – Supercritical CO2 Power Cycles September 9-10, 2014, Pittsburgh, Pennsylvania *Carlson, M. D, Kruizenga, A. K., Schalansky, C., Fleming, D. F. Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-AC04-94AL85000. SAND NO. 2011-XXXXP Overview – SCO2 Cycle Exchangers  Several supercritical carbon dioxide (SCO2) cycles proposed  Proposed as an alternative to steam and organic Rankine systems  Offer high efficiency, compact turbomachinery, fluid compatibility  Recompression Brayton cycles are well-matched to nuclear applications  Proposed SCO2 cycles are highly recuperated to enhance efficiency  Recuperation between 1 and 5 times the net electrical power  Require a combination of high temperature and pressure capability  Will be a significant portion of demonstration and production cycles  Key requirements are pressure containment and cost scalability  Several types can contain high pressures (PFHE, PCHE, S+T)  Current SCO2 test systems use PCHEs almost exclusively  Cost and size scaling suggest S+T units are impractical, despite wide use  Heat Exchanger Developments at SNL  Partnering with Vacuum Process Engineering to understand PCHEs  Developing cast metal heat exchangers (CMHEs) to reduce cost HEAT EXCHANGER BACKGROUND Sup