| 摘要 |
1502926 Thermal regenerators COAL INDUSTRY (PATENTS) Ltd 14 April 1976 [28 May 1975] 23356/75 Heading F4K A gas heating method comprises burning a fuel in a first fluidized bed 8 to heat said bed, circulating heat-conducting material (e.g. the particulate bed material) between the bed 8 and another fluidized bed 46 through which said gas is passed and thereby heated. Apparatus shown for carrying out the method comprises a casing 2 subdivided internally by walls 22, 42 into zones 4, 20, 40 each containing a fluidized bed. In use, bed material is recirculated through all the beds via ports 32, 34, 52 and 54 in the walls 22, 42. 26 is an additional bed for burning any residual fuel carried over from bed 8. Combustion gases from zones 4 and 20 are exhausted at 60. 6 is a gas-permeable grid separating the beds from plenum chambers 16, 28 and 48. Fluidizing gas, e.g. air for the beds 8 and 26 enters the respective plenum chambers 16 and 28 at 18 and 30, and fluidizing gas for the bed 46 (comprising the gas to be heated in said bed) enters the plenum chamber 48 at 50. Heated gas is withdrawn from zone 40 at 62. Recirculation of the bed material may be induced and varied by using different fluidizing velocities in the zones 4, 20, 40 or by using gas jets to direct the flow of bed material. The combustion gases from zones 4 and 20 may after filtering be mixed with the heated gas from zone 40. Heat pipes may be provided in the walls 22 and 42. |
