Prospectus

Return to Table of Contents Volunteer to help write Position Paper

DST-20 Measurement of Entrainment between Dual Flow Trays Expected Benefit toMembers:

Developmental Research Idea

Dualflow trays are used in some critical services. Efficiency normally increases with increasing load. This makes it attractive to push Dualflow trays hard. An understanding of entrainment would assist the designer in finding the optimal design in critical applications. There is little understanding what role entrainment plays in limiting the efficiency of this device. Present Situation and Proposed Research: The entrainment between or from Dualflow trays has never been measured by FRI. The tests can be done in the FRI column. Proposed Internals and Test System: Test Dualflow trays in the low-pressure column. May need to measure the entrainment by some innovative technique such as dye concentration. This technique might then be used on other types of trays to verify previous measurements. In previous cases entrainment was measured by using a dry tray where a downcomer could be used to withdraw the liquid from the tray and measure the flow rate. Unfortunately, Dualflow trays do not have a convenient way to withdraw liquid from the tray. Estimated Unit Time: One hardware configuration (19% open area, 24” tray spacing) with FRI tests at 5 psia, 24 psia and 165 psia. Estimated Additional Costs (Beyond Unit Time): Unknown. Background and Discussion: There are no FRI correlations that predict entrainment for Dualflow trays. This test would be designed to allow extension of the existing sieve tray correlations to Dualflow trays.

PROSPECTUS

Page | 33