By American Institute of Chemical Engineers (AIChE)
This new version of a relied on consultant combines and updates the simplest to be had box wisdom on either trayed and packed distillation columns. in a single whole, common quantity, it offers a compilation of concepts instead of a unmarried set of obligatory steps, permitting readers to pick the technique that most nearly fits their wishes. With its engineer-tested methods and exact causes, the 3rd version offers chemical engineers, plant managers, and different pros with top notch suggestion on assessing and measuring functionality for quite a few distillation column kinds in a number of purposes.
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Extra info for AIChE Equipment Testing Procedure - Trayed and Packed Columns: A Guide to Performance Evaluation
Because of the unsteady state nature of this practice, it can only be used in capacity tests and is not appropriate for efficiency tests. With large columns, a test lasting several days is sometimes best when accurate determination of the flood point is required. In most plant situations, weekend tests are ideal, as changes due to fluctuations in upstream units are minimized. Accurate material and energy balances are important for flood point determination. These should close within 3 and 5% respectively and should 47 AlChE Equipment Testing Procedure be checked before the test and during the test.
4 For a trayed column, liquid temperatures should be measured in the downcomer, or in the seal pan. For trays with truncated downcomers, the thermocouples should be placed in the bottom of the downcomer where clear liquid exists. 5 Accurate vapor temperatures in columns are difficult to obtain, and should be avoided unless no other options exist. The accurate measurement of vapor temperatures calls for probes that permit vapor to flow past them, but are effectively shielded from liquid impingement and other sources of conducted or radiated heat to or from the sensing point.
Pressure taps should be provided so that the performance of each bed or section of trays can be checked as needed. 4 0 4 . 1 Instruments Manometers are the most convenient instruments to install for a temporary measurement of the pressure drop. They are portable, easy to install, and have a wide range of operation. They should be equipped on both sides with seal pots. Differential pressure cells are recommended for high-pressure columns and for permanent installations where a remote reading is desired.