超高温用高性能セラミック熱交換器に関する研究 : 第1報, 流動層内の水平裸管群の熱伝達特性

概要

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Studies were carried out to develop a high-performance ceramic heat exchanger for ultra high temperatures using a fluidized bed. Experiments were performed using a heat exchanger with a ceramic tube bundle immersed in the fluidized bed (maximum bed temperature was 1100℃). Although the cooling air temperature increased from 50℃ to more than 1000℃, fluidization remained stable and the bed temperature uniform. A heat transfer coefficient of outer and inner side of ceramic tubes was obtained, and the effects of the bed temperature, fluidization velocity, cooling air temperature and cooling air velocity on the heat transfer coefficient were evaluated. The results show that the heat transfer coefficient for a fluidized bed was larger than that for single phase flow. This was due not only to the renewal effect by particles but also to radiation from the particles. The performance of the heat exchanger was also evaluated using the coefficient of overall heat transmission and temperature efficiency.
社団法人日本機械学会の論文
1997-11-25