二酸化炭素吸収ガス化によるバイオクリーンガス生産技術開発

抄録

To produce hydrogen from woody biomass, steam gasification using a CO₂ sorbent has been investigated. The principle of the steam gasification using a CO₂ sorbent is shown the following equation; C+H₂O+M→H₂+MCO₂, here M is a CO₂ sorbent. The R&D project, named “Clean gas production from biomass”, has been performed. A continuous bench scale unit has been designed and constructed. A reactor and hoppers of woody powder and calcium oxide powder are set in pressure vessels. The capacity is 10 kg of wood a day.

The laboratory scale examination has been also performed. The powder of Japanese Oak was gasified by using a batch reactor with 50 mL capacity into a clean gas at the reaction conditions of 600 to 700 °C and 0.1 to 5 MPa using calcium hydroxide as a CO₂ Sorbent. The clean gas, mainly hydrogen was obtained at the yield of 1.5 L/g-wood, and it contained 97 vol% of H₂, 3 vol% of CH₄ and 0.1 vol% of hydrocarbons. No CO₂ nor CO was detected in the clean gas.