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1. 发明授权

US4172667A Method and apparatus for blending powders in a fluidized bed 失效
标题翻译：在流化床中混合粉末的方法和装置
公开(公告)号：US4172667A
公开(公告)日：1979-10-30
申请号：US803726
申请日：1977-06-06
申请人： Frederick A. Zenz , Benjamin F. Etheredge
发明人： Frederick A. Zenz , Benjamin F. Etheredge
IPC分类号： B01F13/02 , G21C21/02
CPC分类号： B01F13/0294 , Y10S423/16
摘要： A mixture of powders, preferably UO.sub.2 powders, is blended to complete homogeneity in a nuclear-safe, bubbling-bed fluidized bed blender. The blender includes a generally vertically-oriented, slab-shaped, nuclear-safe mixing vessel having a fluidizing grid disposed on the bottom of the vessel. The fluidizing grid comprises a linear array of generally downwardly-directed pyramidal-shaped hoppers each having walls converging into a conically-shaped closable opening. A plurality of gas orifices is provided for directing a flow of fluidizing gas downwardly into the bottom of each of the hoppers and fluidizing gas is supplied to the orifices at a velocity sufficient to cause bubbles of fluidizing gas to rise through and emerge from the mixture of UO.sub.2 powders until a homogeneous blend of solid UO.sub.2 powders is achieved. The apparatus eliminates dead-zones normally present near the bottom of prior art fluidized bed blenders. A method is also disclosed of blending a mixture of powders which in a preferred application is a mixture of UO.sub.2 powders.
摘要翻译：混合粉末，优选UO 2粉末，以在核安全的起泡床流化床混合器中完全均匀。该混合器包括一个大致垂直取向的板状的核安全混合容器，其具有设置在容器底部的流化栅格。流化栅格包括大致向下定向的锥形的料斗的线性阵列，每个具有会聚到锥形可闭合开口的壁。提供了多个气体孔，用于将流化气体的流向下引导到每个料斗的底部，并且流化气体以足以使流化气体的气泡上升通过并从混合物的混合物中排出的速度供给到孔中直到达到固体UO2粉末的均匀混合物为止。该设备消除了通常存在于现有技术流化床搅拌机底部附近的死区。还公开了一种混合粉末混合物的方法，其在优选的应用中是UO 2粉末的混合物。

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