X線CT法によるバイオコークスの非破壊内部品質分布計測への適用性について

抄録

  The high density high hardness solid fuel (bio-coke) developed by Ida et al. is being hoped for as a solid fuel for heating machineries such as a heavy oil farm boiler. The diameter of the bio-coke made in high pressure and high temperature has a range of 8mm to 100mm. In the case of the 100mm diameter bio-coke specimen, neither pressure nor the temperature is uniform because of thermal conductivity of the biomass and the friction against the cylinder wall. With these reasons, the qualities of the inside of the specimen do not become uniform. Through X-ray CT, nondestructive measurement of the spatial distribution of the x-ray absorption coefficient in the specimen can be done. The x-ray absorption coefficient changes depending on the density of the material, hence, the applicability of this procedure to estimate the X-ray CT quality distribution of a large bio-coke was examined. Results showed that the CT values obtained through X-ray CT have strong relationships with the density distribution in the specimen. Moreover, the CT values were confirmed to be able to effectively estimate the quality distribution of the inside of a large bio-coke.