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Model devised for plant hot-gas bypass systems
09/06/2010
A method to improve design criteria commonly used to size hot-gas bypass systems has been developed through the investigation of the heat transfer that takes place at the gas-liquid interface into the tower's reflux drum.The author used extensive plant data based on the operation of full-scale industrial depropanizer and debutanizer towers to build and validate the model, which relates the heat-transfer coefficient to the Reynolds number of liquid and gas phases.An actual plant case will be presented here, showing that the method was also useful in helping to explain major pressure instabilities caused by excessive subcooling.Hot-gas bypass systems have been largely employed to control to...
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