S-CO2循环中干空气冷却方案的研究.pdf

Investigation of a Dry Air Cooling Option for an S-CO2 Cycle Anton Moisseytsev and Jim Sienicki Argonne National Laboratory, USA The 4th International Symposium - Supercritical CO2 Power Cycles Pittsburgh, PA September 9-10, 2014 Background Traditionally, (nuclear) power plants use water for ultimate heat sink – Restricts plant location choices At the same time, the water restrictions are becoming more important If dry air cooling could be shown to be feasible for an S-CO2 cycle, it will basically eliminate any water use by the plant Goal: investigate what it takes to apply dry air cooling to an S-CO2 cycle Investigation of a Dry Air Cooling Option for an S-CO2 Cycle by A. Moisseytsev, 4th S-CO2 Symposium, Pittsburgh, PA, September 9-10, 2014 2 Why water? Much better heat transfer medium than air – 1000 times higher density 4,000 times lower volumetric flow and pumping power – 4 times higher specific heat – 20 times higher thermal conductivity CO Water Air 2 Units (at 7.4 MPa, 40 (at 1 atm, 30 °C) (at 1 atm, 30 °C) °C) Density kg/m3 998.2 1.196 224.1 Specific heat (C ) kJ/kg-K 4.184 1.005