P-18 木質バイオマスガス化における放射性物質の挙動解明

抄録

Due to the accident at Fukushima Daiichi Nuclear Power Plant occurred in 2011, radioactive cesium was dispersed over a wide range of eastern Japan including forest area. Biomass utilization as gasification feedstock may cause radioactive cesium volatilization, triggering condensation or scattering at a higher temperature. However, much remains unclear about the behavior of radioactive cesium during gasification process. Therefore, the goal of this research is to reveal the behavior of radioactive cesium during gasification for safe biomass use. Through an operation of a laboratory scale gasifier, the behavior were measured in various gasification conditions. As a result, it is revealed that firstly radioactive cesium vaporized at the high reaction temperature (T =900—1000°C), and that secondary the vaporized cesium increases with increasing carbon-conversion-to-gas and S/C ratio at T = 1000°C.