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【多选题】
流化床的优点有: 、 、 、 、 。A.
流-固相界面积大，有利于非均相反应的进行，提高了催化剂的利用效率；
B.
由于颗粒在床内混合激烈，使颗粒在全床内的温度均匀一致，床层与内浸换热表面间的传热系数很高, 全床热容量大、热稳定性高，这些都有利于强放热反应的等温操作。这是许多工艺过程的反应装置选择流化床的重要原因之一
C.
流化床内颗粒群有类似流体的性质，可以大量地从装置中移出、引入，并可以在两个流化床之间大量循环。这使反应-再生、吸热-放热、正反应-逆反应等反应耦合过程和反应-分离耦合过程得以实现。使得活的催化剂在工业中使用
D.
传热、传质速率也较其他接触方式较高
E.
流化床的操作弹性范围宽、单位设备生产能力大、结构简单、造价低，符合现代化大生产的需要
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