Determination of stagnant thermal conductivity coefficient for baled soy bean residue | Određivanja stagnatne toplotne provodljivosti baliranog sojinog ostatka
2010
Erić, A., Institut za nuklearne nauke Vinča, Beograd (Serbia) | Dakić, D., Institut za nuklearne nauke Vinča, Beograd (Serbia) | Nemoda, S., Institut za nuklearne nauke Vinča, Beograd (Serbia) | Komatina, M., Mašinski fakultet , Beograd (Serbia) | Repić, B., Institut za nuklearne nauke Vinča, Beograd (Serbia)
The paper presents results of experimental determination of the stagnant thermal conductivity coefficient of a porous bed formed by biomass bales. The said coefficient represents one of the most important parameters of the bed material specified when considering its combustion in the pusher-type furnaces (i.e. combustion of biomass bales in cigar burners). Correlation obtained is deemed very important for optimization of biomass bale combustion, as well as for modelling transport phenomena occurring in the porous bed formed by biomass bales during their combustion in cigar burners. In order to determine stagnant thermal conductivity coefficient of soy bean straw bales, appropriate experimental method and suitable experimental apparatus were designed and constructed. Experimental investigation was conducted in order to study the effects of relevant biomass bale parameter, i.e. porosity on the stagnant thermal conductivity coefficient. Based on analysis of the said measurement, the results of the functional dependencies of the stagnant thermal conductivity coefficient on the porosity, which was varied in the range 0.6 – 0.8, were defined. Performed experiments have shown that the stagnant thermal conductivity of baled straw decreases with decreasing porosity of the sample, which can be explained by reduction of the closed pores volume, and, accordingly, fluid within them has reduced ability of circulation which causes reduced intensity of heat transfer between the pore walls. The data obtained through investigation are deemed very useful in developing a detailed CFD model for combustion of straw bales in cigar burners.
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