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JARI Research Journal (2012~)環境・エネルギー/Environment & Energy

資料名 / Title

JRJ20151102 研究速報

Consideration for a Pressure Relief Device Activated by Radiant Heat from the Floor

田村 陽介,佐藤 研二
Yohsuke TAMURA,Kenji SATO

燃料電池自動車(HFCV)に搭載される圧縮水素容器には,火災による容器の破裂を防ぐため,火災の熱を検知し,容器内の水素ガスを放出させる熱作動式容器安全弁(Temperature Activated Pressure Relief Device: TPRD)が装着される.TPRDの作動により放出された水素ガスは,既にTPRDの近傍に存在する火炎によって,ただちに着火する.そこで,鉄製の甲板で階層が仕切られた構造を持つ自動車専用輸送船 (Pure Car Carrier: PCC)やフェリーにおいて,HFCVを海上輸送している際での一つの事故シナリオを考える.
In the case a fire breaks out on the lower deck of a car carrier ship or ferry, any fuel cell vehicles (FCVs) parked on the upper deck may be exposed to radiant heat from the lower deck. Assuming that the thermal pressure relief device (TPRD) of an FCV hydrogen cylinder is activated by the radiant heat without the presence of flames, hydrogen gas will be released by the TPRD to form combustible air-fuel mixtures in the vicinity. To investigate the possibility of this accident scenario, the present study investigated the relationship between radiant heat and TPRD activation time and evaluated the possibility of radiant heat causing hydrogen releases by TPRD activation under the condition of deck temperature reaching the spontaneous ignition level of the tires and other automotive parts. It was found: a) the tires as well as polypropylene and other plastic parts underwent spontaneous ignition before TPRD was activated by radiant heat and b) when TPRD was finally activated, the hydrogen releases were rapidly burned by the flames of the tires and plastic parts on fire. Consequently, it was concluded that an explosion of air-fuel mixtures assumed in the accident scenario does not occur in the real world.

種別 / Article Type

JARI Research Journal (2012~)

資料名 / Title

JRJ20151102 研究速報

発行年月 / Date of Issue


分野 / Field

環境・エネルギー/Environment & Energy


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