April 2001

Process Technology/Distillation

Troubleshoot chimney trays effectively

Misapplication of chimney trays can hinder tower operations; six examples detail how to diagnose and debottleneck such trays

Kister, H., Fluor; Blum, B., Rosenzweig, T., Oil Refineries Ltd.

Chimney trays can be troublesome internals for distillation towers. Our recent survey identified chimney trays as the second most problematic tower internal, second only to packed-tower distributors. The following case histories detail situations in which chimney trays were bottlenecks and potential bottlenecks. More important, the corrective action is highlighted for each incident. Learning from such experiences will help engineers to diagnose and eliminate chimney tray bottlenecks and ensure trouble-free operation. Make or break equipment. Chimney trays are one of the most popular devices for drawing intermediate liquid streams out of towers. In packed towers, they are also

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