By American Institute of Chemical Engineers (AIChE)
This new version of a relied on advisor combines and updates the simplest to be had box wisdom on either trayed and packed distillation columns. in a single whole, straightforward quantity, it offers a compilation of innovations instead of a unmarried set of obligatory steps, permitting readers to pick the technique that most nearly fits their wishes. With its engineer-tested strategies and targeted reasons, the 3rd variation presents chemical engineers, plant managers, and different pros with top quality suggestion on assessing and measuring functionality for a number of distillation column varieties in a number of functions.
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Extra info for AIChE Equipment Testing Procedure - Trayed and Packed Columns: A Guide to Performance Evaluation
Samples should be withdrawn at such a low rate that the area being sampled is not starved or disturbed to upset the steady state compositions. Precise temperature and pressure measurements should be made at the sample points for temperature-pressure- composition checks and correlations. 1 Samples of streams external to the column (feed, reflux, products) should be taken where the stream is all liquid or all vapor and well-mixed. Liquid samples (rather than vapor) give better accuracy. If vapor samples must be used, they are best routed directly to the analyzer via tubing.
2 Errors Errors in temperature measurement can still occur even if the sensing elements are accurate. 1 Recommended techniques and practices should be followed to eliminate errors due to conduction and radiation . Thermowells must have an adequate length of insertion into the process fluid being measured. Both the thermowell connection and the external surface of the column 22 Trayed and Packed Columns near the thermowell must be well insulated. Good thermal contact between the sensor and the thermowell is also important.
Starting the procedure either at the normal operating point, or 50% of expected flood, or 50% of the troubleshooting performance point is recommended. 1, the approximate capacity (or flooding point) can be found by increasing the feed rate and/or reboiler heat duty on the column in large steps at rapid intervals, allowing the column to line out before the next increment. As the flooding point is approached, smaller steps should be used to avoid premature flooding. The adjustment intervals may change with the tower sizes and loading levels, as well as sensitivity of downstream units to flooding conditions.
AIChE Equipment Testing Procedure - Trayed and Packed Columns: A Guide to Performance Evaluation by American Institute of Chemical Engineers (AIChE)