高空げき率多孔性材料を用いた伝熱促進法の応用に関する実験研究

Experimental study on application of heat transfer enhancement method using porous material with high porosity

武田 哲明; 一宮 浩一*; 山内 大樹*

Takeda, Tetsuaki; Ichimiya, Koichi*; Yamauchi, Daiki*

本研究では、高温ガス炉水素製造用水蒸気改質器を対象に高空げき率多孔性材料を用いた伝熱促進法が適用可能かどうかを調べるため、水蒸気改質器の流路構成を模擬した実験装置を用いた伝熱流動実験を行い、伝熱流動特性を明らかにするとともに水蒸気改質器への本方法の適用性を検討した。その結果、流路全体で平均したヌセルト数は層流の範囲において、平滑環状流路の値に対して約4倍、ポンプ動力が一定の条件で、伝熱管温度が約400Cのときに伝熱量は約1.3倍増大した。水蒸気改質器への適用性を検討した結果、空げき率や流量等の最適化に検討の余地は残されているものの十分適用可能である見通しを得た。

The objectives of this study are to clarify performances of a heat transfer enhancement method using porous material with high porosity and to discuss applicability of this method for a gas heating type steam reformer. A heat transfer experiment has been performed using a simulated steam reformer apparatus to obtain characteristics of heat transfer and pressure drop. From the results obtained in this experiment, this method showed a good performance regarding heat transfer. It was also found that an enhancement of heat transfer using porous material with high porosity is further improved under the high temperature conditions as compared with the other methods. There is the possibility of the adoption of this method to the steam reformer of the hydrogen production system connected to a high temperature gas-cooled reactor.