Recuperators
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3D cut-a-way model of a typical Schack® FGTT Recuperator. |
The Schack® FGTT Type Recuperator incorporates a design whereby hot flue gas flows through the tubes (FGTT) with preheat air flowing over the tubes in multiple cross-counter flow passes. The FGTT tube bundle is an all welded construction, with refractory lined casing. The high velocity dirty gas flow within the tubes is parallel to (rather than normal to) the heat transfer surface. This eliminates erosive impingement, which would limit life. Additionally, the combination of vertical tubes plus high velocity flue gas flow results in a self-cleaning design. Schack® recuperators in this service have lasted as long as 20+ years without tube replacement.