Abstract
Temperatures and gas concentration inside the dewar flask with volume of 20L filled with RDF were monitored to 20 days. Experiments were performed at the dewar flask in aerobic environment (oxygen concentration: 20%) and anaerobic environment (oxygen concentration 0.5%). As a result, the following three conclusions were obtained. (1) The highest temperature in the dewar flask was 77°C in aerobic environment, and 37°C in anaerobic environment. (2) The highest hydrogen concentration in the dewar flask was 3.2% in aerobic environment, and 53% in anaerobic environment. (3) Oxygen concentration has been increasing and decreasing in 1-2 day period in aerobic environment, aerobic and anaerobic environment were interchanged. There result confirm that inside the dewar flask filled with RDF has coexist aerobic and anaerobic environment and they replaced periodically. This conclusion suggest that collaborated action of aerobic and anaerobic bacteria fermentation effects the mechanism of RDF fire.
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