April 2015

Special Report: Petrochemical Developments

Use vapor distributors to improve fractionation column performance

Vapor distribution has often been neglected in fractionation columns. Although the importance of liquid distribution is well understood and has been a consideration in column design from the early sta..

Fewel, K. J., Technip Stone & Webster Process Technology

Vapor distribution has often been neglected in fractionation columns. Although the importance of liquid distribution is well understood and has been a consideration in column design from the early stages, vapor distribution was not considered for a variety of reasons. In early columns, sufficient space for vapor distribution was usually ample, nozzle momentum was low and no special equipment was specified or even considered. In modern columns, especially re-vamps, the need for high-capacity internals has dominated designs for years. As a result, existing nozzle momentum has become higher, and jetting spray and channeling of vapor in new column internals have become unexpected consequences

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