| 摘要 |
PROBLEM TO BE SOLVED: To provide a circulating fluidized bed boiler with a specified metal plate protector arranged right on the upper part of a refractory material to cover the surface of an evaporator for reducing the wear of the evaporator, suppressing the wear of the evaporator due to particles of fluidizing materials and unburnt ashes. SOLUTION: The metal plate protector is provided right on the upper part of the refractory material to cover the surface of the evaporator following the refractory material, and the protector is formed with its upper part thinner than its lower part. The thickness of a thin portion at the upper edge of the protector is promoted to be reduced by the swirl of the particles, and a swirl generating point is moved downward with the reduction of the thickness and the position of operating the swirl of the particles on the surface of the evaporator is lowered in sequence. Thus, the evaporator is avoided from being exposed to the swirl of the particles at the same position for a long time, and so the local wear of the evaporator is suppressed. COPYRIGHT: (C)2004,JPO
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