Finite Element Calculation Method of Simplified Model of Large Diameter Tube for Heat Exchange Tube

Abstract

The invention discloses a finite element calculating method for a large bore tube simplifying model of a heat exchanging tube. A plate-type heat exchanger is subjected to heat exchange through the temperature difference of fluid on the two sides of the heat exchanging tube so as to achieve the purpose of heating the fluid on one side. The finite element calculating method for the large bore tube simplifying model of the heat exchanging tube comprises the following six steps: step one, establishing and simplifying a finite element calculating model, and conducting multi-series equivalence on the heat exchanging tube; step two, determining the number of heat exchanging tubes of an a-level model according to the finite element calculating model; step three, determining the number of heat exchanging tubes in a-level distribution according to the number of the heat exchanging tubes of the a-level model; step four, determining the sum of the cross sections of the heat exchanging tube after the equivalence to be equal to that of the cross sections of the heat exchanging tubes before the equivalence; step five, arranging the all levels of heat exchanging tubes in a staggered manner; and step six, corresponding the different levels of equivalence to different correction factors being 0.20-1.09. The finite element calculating method is used for manufacturing a tube sheet of the heat exchanger.

Description

[0001] Technical field: [0002] The invention relates to the field of power station or chemical equipment; in particular, it relates to a finite element calculation method for a simplified model of a large-diameter tube of a heat exchange tube. [0003] Background technique: [0004] The tube-sheet heat exchanger is a device that exchanges heat through the temperature difference of the fluid on both sides of the heat exchange tube, so as to achieve the purpose of heating the fluid on one side. [0005] At present, the number of heat exchange tubes in tube-sheet heat exchangers with slightly larger diameters can reach more than a thousand, and the number of heat exchange tubes in larger diameter heat exchangers can even reach thousands. At this stage, the calculation of heat exchanger tube sheets generally adopts the rigid solid circular plate model that ignores the heat exchange tubes. This model has great limitations, and it is not applicable to structures such as thermal st...

AI Technical Summary

Problems solved by technology

This model has great limitations, and it is not applicable to structures such as thermal stress, flexible tube sheet and inclined cone shell, and can only be analyzed by finite element method

For the finite element model of more than a thousand heat exchange tubes, the amount of calculation is extremely large. Even on a mainframe, the time for one calculation can be calculated in months, and the calculation cost is high and the cycle is too long.

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