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Andrew W. Sloley

VECO USA, Inc. (current affiliation)
1313 Bay St
Bellingham, WA 98229 360-676-1500

Presented at the
Chemical Engineering Exposition and Conference
3-4 June 1998

Abstract copyright Andrew W. Sloley
All rights reserved

High capacity trays have been the revamping success of the 90's. The decade started with only one major choice for high capacity tray operation, the UOP MD(tm). Now every medium and larger sized equipment vendor has its own proprietary high-capacity tray. Some vendors offer multiple types. They have added low-cost revamping opportunities for many services not suitable for structured packing. However, relatively few high-capacity trays are in service compared to structured packing or more traditional trays. With every new advance a learning curve of painful experience follows. Basic concepts in high-capacity trays are presented. The objective is to give the engineer the tools to sort out what is possible, what may be possible, and what is hype.

The most common steps to high-capacity use (1) increased active area by using hanging downcomers, (2) using smaller valves or sieve holes, (3) directional valves, and (4) eliminating downcomers entirely. Each combination of options has specific affects on liquid capacity, vapor capacity, flexibility, and cost. Every application has a choice of specific options that fit it best. The basic advantages and limitations of each of the engineering choices is explained. Basic recommendations on what is possible and what is not possible are made.

10 pages
Electronic version available in Adobe Acrobat PDF format file 073.PDF 323k.

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This page updated 22 January 2005
© 2005 Andrew W. Sloley. All rights reserved.