| 主权项 |
1. A method for gasifying a biomass to produce a useful gas, the biomass comprising a material selected from the group consisting essentially of wood- or forest-derived woody materials, plant/algae resources, and forestry/agricultural product wastes,
said method comprising the steps of: introducing the biomass and a gasifying agent separately from each other into a gasification reaction zone, the gasifying agent comprising steam; bringing the biomass into contact with a gasification accelerator in a fluidized state, the gasification accelerator having a catalytic function for a biomass gasifying reaction and a heating medium function in the gasification reaction zone under a raised temperature condition in the presence of the gasifying agent to convert the biomass to a useful gas containing carbon monoxide and hydrogen, said gasification accelerator having an average particle diameter of 60 to 500 microns and comprising smectite clay; and withdrawing the gasification accelerator, on which by-products including char produced in the course of the gasification have been adsorbed, from the gasification reaction zone, introducing the withdrawn gasification accelerator into a regeneration zone, where the by-products adhered and adsorbed on the gasification accelerator are removed by combustion or by a combination of partial combustion with a carbonaceous material gasification reaction, and recycling the regenerated gasification accelerator in a heated state into the gasification reaction zone. |
