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Atmospheric distillation of crude oil processing is the first process , the general flow of processing in the refinery has an important role . Vacuum tower depending on their production tasks can be divided into oil vacuum tower and fuel type vacuum tower types. This paper analyzes the process of vacuum distillation of fuel type structure , fractionation characteristics and comparing different tower internals of hydrodynamics and mass transfer performance , a new type of fuel used in vacuum tower and the tower internals design programs, and were simulated , the last of the fuel after the transformation type vacuum tower was calibrated and benefit analysis . Firstly, there is vacuum tower combines Wushihua serious corrosion , high pressure drop , low yield, residue of poor quality, low softening point of the problem , and select the appropriate tower internals . For vacuum distillation , packed tower comprehensive performance is better than a plate tower , so first determine the choice of vacuum tower packed tower ; filler piece series using ZUPAC group structured packing ; adopt Tianjin University developed a new groove disc and new liquid distributor slot disc collection tank ; less top back entrance, first-and third-line return port , set the trough liquid distributor ; setting the inlet gas distributor circulation baffle , while additional catch liquid energy absorber . This article also uses process simulation software PRO / Ⅱ right before and after reconstruction two kinds of working conditions of process simulation and computational fluid dynamics using special software , right after the transformation decompression tower paragraphs filler accounting. The results showed that : vacuum tower transformed, through the use of new technologies packing and internals , the whole tower pressure drop decreases ; operating conditions have been significantly improved ; gas oil yield increased , residual rate decreased, vacuum residue 500 ℃ ago fraction decreased ; operating conditions more reasonable product index improved, so that the entire device to achieve a higher level of technology . To assess the use of vacuum tower replacement effect , the paper also transformed the vacuum tower calibration and calibration results based on the direct economic accounting . The results showed that the transformation of this vacuum tower design, through the operation of a crude oil distillation unit proved that the transformation effect is very obvious , the design features have been fully reflected , for the factory to create a high economic efficiency.
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