Circulating fluidized bed reactor
AssigneeFoster Wheeler Energia Oy
InventorsTimo Hyppänen, Kari Kauppinen
Life of this patent
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Abstract
A circulating fluidized bed reactor includes a furnace, defined by a substantially vertical and planar first wall, and a particle separator having a return duct adjacent to the first wall. In the lower part of the return duct is arranged a gas seal adjacent to a planar tube wall, which wall is the planar wall or a wall defining a space in gas flow connection with the furnace. The width of the horizontal cross section of the lower part of the return duct, measured in the direction of the first wall, is larger than its depth, measured perpendicular to the width. The gas seal includes a seal structure that includes water tubes bent from the tube wall.
Claims17
A circulating fluidized bed reactor, comprising:
- a furnace, a lower part of which is provided with fluidizing gas nozzles for fluidizing bed material to be fed to the furnace, the furnace being defined by a substantially vertical and planar first wall;
- a particle separator for separating bed material from the gas discharged from the reactor;
- a return duct for bed material separated in the particle separator, arranged in connection with said first wall, and having a lower part;
- a gas seal arranged in the lower part of the return duct, preventing gas from flowing from the furnace to the return duct;
- and
- a receiving space defined by a planar water tube wall, which receiving space may comprise the furnace, whereby the water tube wall is the first wall, or a space in gas flow connection with the furnace,
- wherein the gas seal (i) is arranged in connection with the water tube wall defining the receiving space in such a way that a horizontal cross-sectional width of the lower part of the return duct measured in the direction of the first wall is larger than the depth perpendicular to the width and (ii) has a seal structure comprising water tubes joined to each other and formed by bending water tubes from the water tube wall defining the receiving space.
Dependencies are inferred from the claim text.