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ガス加熱型水蒸気改質器の伝熱特性

Heat transfer characteristics of gas heated type steam reformer

武田 哲明; 大橋 弘史 ; 稲垣 嘉之

Takeda, Tetsuaki; Ohashi, Hirofumi; Inagaki, Yoshiyuki

高温ガス炉に接続する水素製造システムにおいて、ヘリウムガス加熱型の水蒸気改質器反応管外側の伝熱促進が水素製造量に及ぼす影響と内管を加熱,外管を断熱した環状流路の熱伝達について検討した。その結果、内管加熱外管断熱の環状流路内に気体が流れる場合の伝熱量は、加熱壁面温度が150$$^{circ}$$C程度でも熱放射により対向壁が加熱される影響は無視できず、流路全体としての気体への伝熱量を求める場合は対向壁が加熱される影響を評価する必要がある。

A technology development of a hydrogen production system by a nuclear heat are being performed as a heat application system of a high-temperature gas cooled reactor in the Japan Atomic Energy Research Institute. The objective of this study is to clarify heat transfer characteristics of the steam reformer in the HTTR hydrogen production system. An experiment has been performed using a double coaxial vertical tube to obtain the heat transfer characteristics and to evaluate the effectiveness of heat transfer enhancement. The amount of produced hydrogen increases with increasing not only reaction rate of catalysis but also the heat transfer coefficient. It is necessary to take into account of heat transfer from both surfaces of the double coaxial tube in order to obtain the amount of transferred heat from the heated tube to the coolant gas.

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