Preheating device for oxygen-enriched combustion

The utility model discloses a preheating device for oxygen-enriched combustion, which comprises a smoke pipe, an air guide pipe is arranged in the smoke pipe, a plurality of air mixing devices are sequentially arranged in the air guide pipe, and each air mixing device comprises a bearing connected with the air guide pipe through a connecting rod and a rotating shaft arranged in the bearing. And one end of the rotating shaft extends to the outer side of the bearing and is connected with a plurality of fan blades. The heat exchanger has the advantages that air can be fully mixed, so that the air is uniformly heated, and the heat exchange efficiency is high. 本实用新型公开了一种富氧燃烧用预热装置，包括烟管，所述烟管内设有导风管，所述导风管内依次设有若干个空气混合装置，所述空气混合装置包括通过连杆与导风管连接的轴承和设于轴承内的转轴，所述转轴的一端伸出至轴承的外侧连接设有若干个扇叶。本实用新型的优点在于：可以对空气进行充分混合，使之受热均匀，换热效率高。