SODIUM-CO_2 INTERACTION IN A SUPERCRITICAL CO_2 POWER CONVERSION SYSTEM COUPLED WITH A SODIUM FAST REACTOR

摘要

For the supercritical CO_2 Brayton cycle of a sodium-cooled fast reactor, we carried out surface reaction tests for sodium temperatures ranging from 200 to 600℃. Based on the test results, we found that the reaction kinetics over the sodium temperature range of 300 to 550℃ depends heavily on the temperature but is not sensitive to the velocity of CO_2 flowing over the gas-liquid reacting inter- face explored in this study. Gaseous and nongaseous reaction products were sampled and analyzed quantitatively. The rates of the chemical reaction were determined by measuring the gas concentration of the CO/CO_2 mixture. Then, we proposed a two-zone reaction model with a threshold temperature of 460℃. The kinetic parameters for each reaction zone were experimentally obtained.