アスファルト固化処理施設火災爆発事故の中期的課題の対応; カルベ式熱量計MS80による模擬アスファルト混合物の熱量測定

Measurement of heat generation from simulated bituminized product

加藤 良幸 ; 米谷 雅之

not registered; not registered

アスファルト固化処理施設で発生した火災爆発事故の発生原因を究明するために、模擬アスファルト固化体を調製し、高感度のカルベ式熱量計であるMS80を用いて低温域(200以下)における模擬アスファルト固化体の発熱特性を把握するための測定試験を実施した。この測定の結果、恒温測定において検出できた最大発熱量が160で約1mW/g、200で約2mW/g、昇温速度0.01/minの昇温測定において検出できた最大発熱値は約0.5mW/gであった。また、模擬アスファルト固化体の調製法や模擬アスファルト固化体中の塩粒径、塩含有率(45%、60%)の違い、模擬沈殿物の添加の有無など模擬固化体の条件を変化させて測定したが、検出された発熱特性に有意な違いはみつけられなかった。

The fire and explosion incident occurred at Bituminization Demonstration Facility of PNC Tokai Works on March 11, 1997. In order to ascertain the cause of incident, the investigation has been pushed forward. For the investigation, we prepared simulated bituminized product for measurement of heat generation in low temperature region less than 200 C. We used calvet Calorimeter MS80 for the heat generation measurement. Result of measurement, We were able to catch the feeble heat generation from bituminized product. The maximum calorific value that was able to detect it in isothermal measurement was approximately 1 mW /g in 160 C. It was approximately 2 mW /g in 200 C. And, as the another measurement, the measurement condition went heat rate by 0.01 C/minute, the highest temperature 190 C. As a result, the maximum generation of heat value that was able to detect it was approximately 0.5 mW /g. I changed simulated bituminized products and measured these. A difference of condition is salt particle size, salt content rate (45%, 60%), addition of the simulated precipitate. But there was not a difference in the generation of heat characteristic detected.