Effect of Lattice Oxygen on Low Temperature Gasification in Fluidized Bed, GLO

抄録

Low temperature gasification using GLO (Gasification using Lattice Oxygen) was investigated based on the Chemical Looping Combustion or MERIT(MEdiator Recirculation Integrating Technology) reaction system utilizing the lattice oxygen of metal oxide coated on porous particles to oxidize organic compounds for effective solid fuel conversion. Pyrolysis and steam gasification were tested in a single column reactor in which the flow of the gasification agent and the air were switched to change the gasification and the oxidation (combustion) under the temperature range from 723 K to 973 K. Generated gas composition was analyzed by micro gas chromatography. Deposited and unreacted carbon were combusted with low oxygen concentration air; 5-13% -O₂ simulating exhaust of conventional combustor and gas turbine. Hydrogen was a major product and methane, CO and CO₂ were minor products in this system. No wax and tar were observed in the exhaust line while a certain amount of wax and tar were observed in the experiment without metal oxide. When steam was supplied, hydrogen yield became 3 for 1 moles of carbon at 773K. As a result of the experiments, GLO system has possibilities for the low temperature gasification.