Method and apparatus in a fluidized bed heat exchanger
AssigneeFoster Wheeler Energia Oy
InventorTimo Hyppänen
Life of this patent
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Abstract
A method and an apparatus in a fluidized bed heat exchanger including a heat exchange chamber having a fluidized bed of solid particles, heat transfer surfaces, an inlet, and an outlet. Particles are fed through the inlet onto the upper surface of the bed of solid particles by a guiding channel. The guiding channel, which extends from above the upper surface of the bed of solid particles to the surface thereof, or to below the surface, passes the solid particles to the restricted area of the surface. The outlet is formed in the area of the guiding channel to remove particles from the area delimited by the guiding channel. Uncooled particles can thus be removed from the heat exchange chamber.
Claims26
A method of controlling heat transfer in a fluidized bed heat exchanger having a heat exchange chamber with a bed of solid particles therein, the method comprising the following steps:
- (a) feeding solid particles through an inlet in an upper portion of the heat exchange chamber to the upper surface of the bed of solid particles therein by passing the solid particles along a guiding channel to a restricted area of the upper surface of the bed of solid particles defined by the guiding channel;
- (b) fluidizing the bed of solid particles in the heat exchange chamber with a fluidization gas;
- (c) transferring heat by heat transfer surfaces away from the fluidized bed of solid particles;
- and
- (d) removing solid particles from the heat exchange chamber through a first outlet formed in the area of the guiding channel.
A fluidized bed heat exchanger, comprising:
- a heat exchange chamber having a bed of solid particles therein;
- means for feeding fluidization gas into the heat exchange chamber for fluidizing the bed of solid particles therein;
- heat transfer surfaces in contact with the bed of solid particles in the heat exchange chamber;
- an inlet (24, 74) arranged in an upper portion of the heat exchange chamber, through which solid particles are fed to the heat exchange chamber;
- a guiding channel extending from above the upper surface of the bed of solid particles at least to the surface of the bed of solid particles, along which the solid particles are guided from the inlet to a restricted area of the upper surface of the bed of solid particles defined by the guiding channel;
- and
- a first outlet formed in the area of the guiding channel, through which solid particles are removed from the heat exchange chamber.
Dependencies are inferred from the claim text.