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首页> 美国政府科技报告 >EXPERIMENTAL INVESTIGATION OF LOW-TEMPERATURE DESUBLIMATION OF URANIUM HEXAFLUORIDE FROM MIXTURES WITH HYDROGEN USING COMPACT COUNTER-CURRENT HEAT EXCHANGERS
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EXPERIMENTAL INVESTIGATION OF LOW-TEMPERATURE DESUBLIMATION OF URANIUM HEXAFLUORIDE FROM MIXTURES WITH HYDROGEN USING COMPACT COUNTER-CURRENT HEAT EXCHANGERS

机译：利用紧凑型逆流换热器从氢气混合物中低温脱除六氟化铀的实验研究

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In separation nozzle cascades processing a mixture of UF sub 6 and hydrogen a net upward transport of the light auxiliary gas is produced. In recycle facilities, the UF sub 6 content has to be stripped with high efficiency from the recycled hydrogen by using a special separation nozzle stage backed by a low temperature freeze-out heat exchanger system, which reduces the UF sub 6 content of the hydrogen from about 0.3% to values below 1 exp 6 ppM. With an experimental setup one seventh the cross-section of an industrial unit, the freeze-out process in a compact counter-current heat exchanger has been investigated to optimize the operation of the system. The experiments have shown that the theoreticallly expected improvement of mass to heat transfer by the ratio Le/Le exp 2 / exp 3 , as compared to stabilized laminar flow, is actually obtained and no perturbations by snow formation are observed for supersaturation factors up to 1000. The UF sub 6 content in the hydrgen processed was always below 0.1 ppM. (ERA citation 04:012554)

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