Simulation and Revamp of the Double-feed Distillation Tower of the Cracking Gasoline Hydrogenation Unit
The feedstock of the ethylene cracking gasoline hydrogenation unit is divided into two streams:light and heavy naphtha,which have significant differences in their fraction distributions.In the conventional process,the mixture of light and heavy cracked gasoline is cooled and stored in the tank area,leading to a series of energy bottlenecks,including cooling losses of heat,remixing of materials in the depentanizer tower,increased energy consumption in the reboiler,and increased VOC emissions from the tank area.The utilization of dual-feed optimization can eliminate the above bottlenecks.A simulation analysis is conducted,and the results shows that the load of the reboiler of the depentanizer tower of ethylene cracking gasoline hydrogenation unit significantly decreased,while the reflux ratio increased to some extent.A petrochemical company carried out an energy-saving revamp of the depentanizer towers by implementing dual-feed optimization for the ethylene cracking gasoline hydrogenation unit.After the revamp,light and heavy gasoline are respectively fed into the towers from the upper and lower parts,and the feed temperature was increased from the original 32℃to 77℃and 86℃.The steam consumption per unit of feed in the reboiler decreased by 24.5%,which has significant energy-saving effect.
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