傾斜地管路内の木質バイオマス水力輸送に及ぼすチップアスペクト比の影響

概要

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The unused biomass such as residues left on forest floor and unused portions of farm crops is considered as the most promising domestic resources in Japan. The utilization of unused biomass contributes to the environmental protection of forests as well as the reduction in exhaustion of carbon dioxide. To promote the utilization of woody biomass generated in forests and hilly agricultural areas, the efficiency for the transportation across hilly district regions has to be improved. In the present study, the hydraulic transportation system of wood chips by means of liquid film flow in sloped pipeline is proposed. The transportation limit of wood chips with various aspect ratios is investigated by using the test section imitating the hilly terrain pipeline. The results obtained are as follows. The maximum flow rate of wood chips is caused by the occurrence of hydraulic jump in horizontal flow, and is greatly affected by the liquid film flow rate and aspect ratio of wood chips. The analytical model to predict the stagnation of wood chips is presented, and it is found that the model gives a fairly good agreement with the experimental results of maximum flow rate of wood chips.