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      • Temperature Distribution and Self-heating of Biomass during Storage in Flexible Intermediate Bulk Containers

        ( Pavel Ehler ),( Teppei Komiya ),( Takayuki Shimaoka ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-

        This paper provides experimental investigation as well as numerical simulations on the influence of moisture content and dry bulk density on self-heating of biomass during storage in flexible intermediate bulk containers (FIBC). The accident at the Fukushima Daiichi Nuclear Power Plant (NPP) in March 2011 was caused by the great earthquake and tsunami, and as a consequence released large quantities of volatile radionuclides into the environment. Therefore, the Japanese government is working on decontamination of contaminated areas off-site the Fukushima NPP, which includes removing of the top layer of soil and biomass, mainly branches and grass, and storage in FIBC. Biological self-heating is one of the issues which can occurs during storing of biomass, thus it has been investigated by experiment and associated with numerical simulation of simulate heat transport and distribution inside FIBC. The effects of the moisture content and dry bulk density on self-heating of biomass were established during the 90 days of indoor experiment at ambient temperature. The results show strong impact of moisture content and dry bulk density on temperature rise and distribution inside FIBC due to respiration and decomposition of biomass. The highest temperature reached to 69.0 °C in FIBC having 81.3% moisture content in the first two weeks. On the other hand, dry biomass (Moisture content: 14.6%) nearly imitated the ambient in temperature. Moreover, weight loss and settlement occurred mainly in FIBC with 68.5 and 81.3% moisture content and it could significantly influence the storage process. Based on the results, it was revealed that keeping low level moisture content about 15% during filling and storing biomass inside FIBC prevented from self-heating and also spontaneous ignition.

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