Fluidized bed heat exchanger utilizing angularly extending heat exchange tubes
AssigneeFoster Wheeler Energy Corporation
InventorsFred M. Talmud, Juan-Antonio Garcia-Mallol
Life of this patent
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Abstract
A fluidized bed heat exchanger in which air is passed through a bed of particulate material containing fuel disposed in a housing. A steam/water natural circulation system is provided and includes a steam drum disposed adjacent the fluidized bed and a series of tubes connected at one end to the steam drum. A portion of the tubes are connected to a water drum and in the path of the air and the gaseous products of combustion exiting from the bed. Another portion of the tubes pass through the bed and extend at an angle to the upper surface of the bed.
Claims9
A heat exchanger comprising a housing, means defining a chamber in said housing, means for establishing at least one bed of particulate material containing fuel in the lower portion of said chamber, means for passing air through said bed to fluidize said material and promote the combination of said fuel, said air combining with the gaseous products of combustion of said fuel and passing through the upper portion of said chamber, a steam drum, a series of tubes connected at one end to said steam drum, a portion of each of said tubes extending through said lower and upper chamber portions, the tube portions extending through said lower chamber portion being immersed in said bed with at least a portion thereof extending at an acute angle to the upper surface of said bed, the tube portions extending through said upper chamber portion extending vertically, and means connecting said steam drum to the other end of said tubes for permitting water to pass from said steam drum, through said tube portions, and back to said steam drum to transfer heat from said fluidized bed and said air and gaseous products of combustion to said water.
Dependencies are inferred from the claim text.