A CONSIDERATION OF THE USE OF COMPOSITE TUBES AND OVERLAY WELDED TUBES IN BLACK LIQUOR RECOVERY BOILERS

摘要

WHY COMPOSITE OR OVERLAY WELDED TUBES?1. These kind of tubes should be used for process conditions outside and inside the tube require material properties that cannot be met by one material only.2. Picture:2.1 The left part shows the two hollows of the different materials.2.2 The right part of the picture shows how to assemble the two hollows for hot co-extrusion.