A design method for heat exchanger tube sheets under large complex working conditions

Abstract

The invention belongs to the technical field of heat exchanger tube plate thickness design, and in particular relates to a design method for a heat exchanger tube plate under large complex working conditions. The present invention uses the finite element method to study the stress of each key part of the heat exchanger with the change law of the tube sheet thickness under the action of each representative single load, that is, the tube side pressure, the shell side pressure and the temperature difference load. Combined with the analysis of the stress combination caused by each load, combined with the analysis and design stress classification method and the allowable limits of various stresses, the design thickness of the heat exchanger tube sheet is preliminarily determined, and finally the preliminary design thickness of the tube sheet is determined at the design load, that is, the tube The design pressure of the tube sheet, the design pressure of the shell side, the design pressure of the shell side of the tube and the loads of multiple special working conditions are checked, and the design thickness of the tube sheet is finally determined. The design thickness of the tube plate obtained by the present invention is the smallest, and a large amount of design redundancy is avoided under the premise of ensuring the safety of equipment operation.

Description

technical field [0001] The invention belongs to the technical field of heat exchanger tube plate thickness design, and in particular relates to a design method for a heat exchanger tube plate under large complex working conditions. Background technique [0002] A heat exchanger with a large and complex working condition is a heat exchanger whose diameter is far beyond the design range of GB151 and has a complicated working process, such as the butyraldehyde converter and butanol converter in the butanol production unit, and its working process not only includes The normal operating conditions of conversion reaction and heat exchange also include special conditions such as catalyst oxidation and reduction. It is understood that domestically produced butyraldehyde converters have been put into operation in this type of heat exchanger, but the tube sheets of domestic butyraldehyde converters are generally thick (for example: the thickness of the tube sheet of the Φ4900mm butyra...

AI Technical Summary

Problems solved by technology

It is understood that domestically produced butyraldehyde converters have been put into operation in this type of heat exchanger, but the tube sheets of domestic butyraldehyde converters are generally thick (for example: the thickness of the tube sheet of the Φ4900mm butyraldehyde converter is 80mm, and the thickness of the tube sheet of the Φ4600mm butyraldehyde The thickness of the tube sheet of the converter is 66mm, and the thickness of the tube sheet of the Φ4100mm butyraldehyde converter is 60mm), which makes the domestic butyraldehyde converter at a disadvantage in the market competition

According to investigation and analysis, at present, in the design of heat exchanger tube sheets under large and complex working conditions such as butyraldehyde converters, the analytical method is generally used to initially estimate the thickness of the tube sheet, and then the finite method is used to check it, but in the finite element model The beam or rod element is used to simulate the heat exchange tube during establishment, and the equivalent treatment of the tube sheet is carried out; the use of the beam, rod element and the equivalent treatment of the tube sheet cannot accurately simulate the local temperature of the connection between the heat exchange tube and the tube sheet field and stress field, in addition, the rationality of tube-sheet equivalent treatment may also affect the accuracy of check calculation

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