| 摘要 |
<p>A fluidized bed (6) furnace (4) holds inert particles with a density and grading exceeding that of the substrate. Compressed air (16) is injected (14) into the bed, fluidizing and mixing the particles. The bed is held at 650degreesC to burn the organic particles, whilst the substrate is fed in. Flue gases (26) from the bed are filtered (8) (cyclones), recovering the filtration substrate particles. The substrate is introduced into a furnace zone with an overall downward flow of particles. It is introduced at the edge of the bed, below its upper surface (6a). It enters at close to three quarters of the bed height. Fuel gas (18) is also injected (20). The furnace burner (22) is above the bed. Grading of the inert particles of the bed is 5-50 times that of the filtration substrate particles. Temperature in the furnace at the upper surface of the fluidized bed, exceeds 850degreesC. Oxygen content of gases from the bed is at least 6%, on a dry basis. The feed system (2) is thermally-insulated from the furnace. Substrate particles are filtered (cyclones) in two successive stages. The particles from filtration are recovered in accordance with their grading.</p> |
