1-02　バイオマス利用水素製造プロセスの開発

酸化鉄系粒子の反応性評価

抄録

Hydrogen has been attracting increasing attention in response to the rising global demand for energy. This study investigates chemical looping combustion (CLC) as a promising technology for practical hydrogen production utilizing carbonaceous fuel. In the CLC process, hydrogen, CO₂, and oxygen-depleted air are separately extracted through the cyclic redox reactions of iron oxide with steam, fuel, and air, respectively. The hydrogen is separated from CO₂ and other byproducts during the process, thereby reducing the cost associated with hydrogen purification. Furthermore, when biomass is employed as the fuel, CLC offers a sustainable pathway for the production of renewable (green) hydrogen. In this study, a triple-fluidized bed hydrogen production system consisted of a fuel-reactor, a hydrogen-reactor, and an air-reactor is proposed to apply the CLC method. In the experiment, a thermogravimetric analyzer (TGA) was used to measure the reactivity of oxygen carrier particles, and the dependence of the hydrogen production rate on water vapor concentration and deactivation with repeated use were evaluated. In addition, steam gasification of char obtained from a triple-fluidized bed reactor was performed. Hydrogen production and CO, CO₂ emissions were also determined. The results can be used to determine the optimal temperature for the hydrogen-reactor of the triple-fluidized bed process.