著者

植田 公雄 藤村 亮 中野 才治 平島 浩 久保田 雄 服部 禎男 伊藤 力生 平塚 法夫

出版者

一般社団法人 日本原子力学会

雑誌

日本原子力学会誌 (ISSN:00047120)

巻号頁・発行日

vol.29, no.5, pp.428-435, 1987

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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.