Erosion shielding for a circulating fluidized bed boiler
AssigneeKvaerner Power Oy
InventorsKari Makela, Kari Kuukkanen
Life of this patent
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Abstract
A method for shielding the inner surface above the shield refractory (4) of the furnace wall (3) of a circulating fluidized bed boiler from erosion caused by suspension flows, in which method a shield structure is formed on the inner surface of the boiler wall. At least a first zone (1) and a second zone (2) are formed in the shield structure, the erosion-resistance properties of which zones differ from each other. In addition the invention relates to a circulating fluidized bed boiler, which comprises a corresponding shield structure.
Claims14
A method for shielding the inner surface above the shield refractory of the furnace wall of a circulating fluidized bed boiler from erosion caused by suspension flows, in which method a shield structure is formed on the inner surface of the boiler wall,
- wherein
- at least a first zone and a second zone are formed in the shield structure, the erosion-resistance properties of which zones differ from each other.
A circulating fluidized bed boiler, which comprises at least
- a furnace,
- a shield refractory arranged in the wall of the lower part of the furnace to shield the inner surface from the erosion caused by suspension flows, and
- a shield structure, which is located at least partly above the shield refractory on the inner surface of the wall to shield the inner surface above the shield refractory from the erosion caused by suspension flows,
- wherein
- the shield structure comprises at least a first zone and a second zone, whose erosion-resistance properties differ from each other.
Dependencies are inferred from the claim text.