CIRCULATING FLUIDIZED BED BOILER

摘要

A circulating fluidized bed boiler, comprises a hearth, wherein, the hearth comprises an inner wall (22) and an outer wall (21), and the outer wall surrounds the outside of the inner wall. The annular space (20) between the inner wall and the outer wall composes the interior of the hearth. The hearth dimension in every direction can be increased simultaneously when the area of the hearth is enlarged, hence effectively avoiding the problem because of the increase of the hearth dimension in one direction and maladjustment of width-depth ratio in the prior art. The annular hearth is a completely run-through and integrally formed space, thus when the boiler is in operation, the risk of'reversion of the bed'resulting from pressure unbalance and severe oscillation of pressure does not exist.