Analysis And Design For Special Structure Of Shell-and-tube Heat Exchanger With Helicar Baffles In Atmospheric And Vacuum Distillation Unit

Helical heat transfer heat transfer technology is LUMMUS's patented technology, the technology for over 30 years of history, because of its good results, has now been accepted by the world's major leading companies such as Shell, the U.S. floating, Total , Exxon, etc.. Helical baffle heat exchanger design guiding ideology is to change the traditional segmental baffle the Z-shaped flow patterns, managed to baffle and tubes designed to have a tilt angle, helical surface arranged similar to the heat exchanger the shell fluid to achieve a continuous spiral flow, in order to achieve lower flow resistance and shell heat transfer enhancement purposes. Thereby eliminating the traditional segmental baffle resistance, and have a dead zone, heat transfer coefficient shortcomings.According to related statistics, base oil refinery atmospheric and vacuum flash unit - - vacuum residue heat exchanger shell media for the operation of vacuum residue, which has a viscous medium, and poor flow characteristics. The heat exchanger structure often using traditional segmental baffle form, this structure easy to form dead-heat, causing the heat transfer area and heat transfer tube outer wall did not make full use of severe scaling, resulting in greatly reduced heat transfer performance. In this thesis, a petrochemical company 10 million tons / year oil refining base oil atmospheric and vacuum flash unit - - vacuum residue heat exchanger (device bit No. :110-E108) as an engineering example, expand on the helical baffles heat exchanger structural analysis, bold structure of the helical baffles used in the device and process for heat transfer experiments, process calculation and detailed structural design. Final design of a more compliant helical baffles heat exchanger, to solve the atmospheric and vacuum distillation have been troubled by the heat exchanger maintenance period is short, running for some time after the effect of heat transfer reduction, maintenance of the high cost and large tube vibration problems , thus extending equipment life cycle, shortening the maintenance cycle, reducing maintenance costs, long-term operation for the entire device to provide support.This article will focus on helical baffle heat exchanger structure, different helical angle of the heat transfer process testing, heat transfer technology and other aspects of computing. Including the calculation of the specific heat transfer area, spiral angle, and computing the distance between baffles, helical baffles the geometry of the design, strength calculation and so on all parts. Different angle of heat transfer through laboratory tests by a variety of process data and the data analyzed after the final determination of reasonable parameters, after the calculation of strength calculation software to determine the structure of various components of heat exchanger size, the final completion the flash base oil - vacuum residue detailed design of heat exchangers.