木材の長期加熱発火による火災発生の可能性の検討 (I)熱伝導項の寄与の大きい場合の木材の長期低温加熱発火の可能性

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タイトル別名
  • Checks on the Possibilities for the Spontaneous Combustion of Wood<br>Checks on the Possibilities for the Spontaneous Combustion of Wood-pillar as Heated Periodically by the Neighboring Chimney at Relatively Low Temperature for the Long Period.
  • 木材の長期加熱発火による火災発生の可能性の検討-1-熱伝導項の寄与の大きい場合の木材の長期低温加熱発火の可能性
  • モクザイ ノ チョウキ カネツ ハッカ ニ ヨル カサイ ハッセイ ノ カノウセイ ノ ケントウ 1 ネツ デンドウコウ ノ キヨ ノ オオキイ バアイ ノ モクザイ ノ チョウキ テイオン カネツ ハッカ ノ カノウセイ

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説明

Studies have been pursued on the spontaneous ignition of woods as a source of fire, when heated for the long period at relatively low temperature. Experimental checks have been conducted on the possibilities for the spontaneous ignition of newly-constructed fresh wood-pillar which had been partially surrounded by the plaster and heated periodically by the neighboring chimney at relatively low temperature for four months.<br>The above studies have been pursued for the objective to elucidate the suspicion on the spontaneous combustion of wood-pillar as a cause of fire at Happo-kan Hotel in Tokyo.<br>For the purpose‚ systems of the same size and proportions with the real one have been revisualized for the experiment in the large-scale and measurements have been conducted to obtain the changes in the temperature-profile of the system concerned during the passage of long-period heating. As results, stationary states with the heating-media have been obtained in both periodic and continuous heating cases and no symptoms have been observed for the temperature-jump as the cause of fire. Checks have been made on the basis of Fourier’s equation involving non-linear Arrhenius-term for the balance between the heat-loss by the conduction to the circumference and gain of heat evolved in the system concerned by the thermal degradation or smouldering combustion at relatively low temperature for the long periods. Numerically computed temperature profile by I. B. M 1620 computer on the basis of the observed ones in the plaster-part of the system have been fairly coincided with the experimental ones at the center of the wood-pillar in the system concerned. Checks have also been made for the possibilities of spontaneous ignition by the contribution of the Arrhenius-terms based on activation-energies among new wood-panel‚ dead wood and saw-dust‚ taking into consideration the effect of heat-conduction by the circumferences.<br>As results‚ we have reached to our conclusion that there has been no reason to commit the Possibilities of the spontaneous combustion of wood-pillar as the cause of fire in the system concerned except the false case for the presence of the very fragile wood-pillar made from saw-dust or dead-wood to support the newly-constructed building.

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