平板型大型流動床ウラン脱硝反応器の開発　Ｉ　　基本的流動特性

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  • Slab-type large-scale fluidized bed reactor for denitration of uranium nitrate. I. Fundamental fluidization characteristics.
  • ヘイバンガタ オオガタ リュウドウショウ ウラン ダッショウ ハンノウキ ノ
  • Fundamental Fluidization Characteristics
  • 基本的流動特性

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A slab-type, large-scale fluidized bed reactor has been proposed as a means to obtain an adequate heat transfer area satisfying the limit of critical safe size, for use in the denitration reaction of highly enriched U. More specifically, with respect to the reactor, 120-mm wide, 1, 900-mm long, 4, 000-mm high, capable of 4% U enrichment, 3 t-U/d, examinations were conducted of its fundamental fluidization characteristics and the characteristics thus obtained showed that the reactor can be used with no ploblem and in a more stable manner than the conventional cylindrical reactor. The results are as follows:<BR>(1) It was found possible to approximate the reactor's fluidization initiation gas rate to the values obtainable by Babu's and Leva's formulas.<BR>(2) It was shown that the bed expansion can be approximated to 0.65 as calculated by Babu's formula.<BR>(3) Kato's formula can be applied, with some modifications, to the calculation of the bubble size in the fluidized bed.<BR>(4) An empirical formula was established for measuring the height of "jumping" particles, which is necessary in designing the reactor.<BR>(5) It was also found that the slab-type fluidized bed reactor operates with much less slugging and in a more stable manner than the cylindrical reactor.

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