Mathematical Models for D_2-DTO Isotopic Exchange Process of Detritiation Systems

摘要

The present work has the purpose to determine the flow behavior of both phases, gaseous and liquid, of the hydrogen isotopes in order to obtain a better separation factor between hydrogen and water, α~(D/T)' in the D_2-DTO large scale isotopic exchange column. Seeing that direct determination of the fractions of the hydrogen isotopic species is difficult and rather imprecise, the numerical estimation method with high precision is strongly required.rnTherefore we shall use series of isotope exchange process characteristic equations to obtain the precise results needed in the design process for the achievement of the operating data target. Transfer process occurs on hydrophobic catalytic fillers that allow direct contact between water and deuterium gas in liquid form on the catalyst surface. Deuterium, enriched in heavy isotopes, leaving at the top of LPCE column and enter in C1 condenser, where is cooled and condensed the water vapor, cooling circulation achieved by countercurrent flow with subcooled water at temperature 4 - 6℃. Subcooled water system consists of a fully automated Chiller, cooling water being mixed with antifreeze. Of C1 condenser, deuterium is sent to plant 200 for advanced drying. In LPCE module the tritium is transferred of water in deuterium flow by catalytic exchange in liquid phase: A special attention will have the two first weight reactions in the isotopic exchange process: D_2(g) + DTO(v) ←→ DT(g) + D_2O(v) DTO(l) + D_2O(v) ←→DTO(v) + D_2O(l) 1 - Liquid phase v - Vapour phase