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循環流化床的特點
 點擊數:1980次 添加時間:2020-9-21 [打印] [返回] [收藏]

       循環流化床是將大量固體顆粒懸浮于運動的流體之中,從而使顆粒具有流體的某些表觀特征,這種流固接觸狀態稱為固體流態化。即循環流化床。


       循環流化床circulating fluidized bed在氣速大于顆粒的 自由沉降速度下進行流化,顆粒被氣流帶出,把氣體與固體分離后,固體又循環回床層中所構成的流化床。它在工業中有很多用途,例如用于催化裂化,催化劑在提升管中被重油蒸氣流化并輸送,同時發生反應。在提升管頂部失活的催化劑與油氣分離后進人另一個流化反應器〔再生器),被空氣流化并進行再生。再生后的催化劑又循環回提升管,構成組循環流化床的催化裂化反應器。



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