Tube side type heat exchanger with composite double-tube plate structure

Abstract

The invention discloses a tube side type heat exchanger with a composite double-tube plate structure, which comprises a shell side barrel body (5), heat exchange tubes (4) and a heat exchange tube plate, the heat exchange tube plate is of an integrated structure comprising a base tube plate (2) and a covering tube plate (1), the circumference of which is sealed and the middle of which is provided with a cavity, and the cavity is a cavity which is sunken in the tubing area of the base tube plate (2) along the axial direction of the heat exchanger; the top of the base tube plate (2) is provided with an escape orifice (3) which is inserted into the base tube plate (2) along a direction perpendicular to the heat exchange tubes and communicates with the outside upwardly and the cavity internally; and the bottom of the base tube plate (2) is provided with an emptying orifice (6) which is inserted into the base tube plate (2) along a direction perpendicular to the heat exchange tubes and communicates with the outside downwardly and the cavity internally. The heat exchanger disclosed by the invention completely keeps the advantages of a double-tube plate heat exchanger, can effectively prevent the mixture of tube side medium and shell side medium, and also overcomes the defects of a lot of conventional double-tube plate structures, the machining difficulty of double-tube plate heat exchangers is effectively decreased, and the manufacturing cost of the double-tube plate heat exchangers is effectively reduced.

Description

Technical field [0001] The invention relates to the field of chemical equipment, and more specifically, to a tube-type heat exchanger with a composite double tube plate structure. Background technique [0002] There are two tube plates between the tube side and the shell side of the double-tube sheet shell-and-tube heat exchanger. Due to its special structure and function, it occupies an important position in the petroleum and chemical fields. The connection between the heat exchange tube and the tube sheet is the weak link of the shell-and-tube heat exchanger, which is more likely to leak and cause mixing of the tube and shell side media. In some cases, this kind of leakage is absolutely prohibited. For example, the mixing of two media will cause explosion, severe corrosion, catalyst poisoning, or material contamination and deterioration. At this time, the double tube plate structure is most suitable. [0003] At present, the commonly used double tube sheet forms include three t...

AI Technical Summary

Problems solved by technology

First, the utilization rate of the heat exchange tube is low: due to the relatively large gap g between the shell side tube sheet and the tube side tube sheet, the effective heat transfer length of the heat exchange tube is significantly reduced, and the heat transfer area is reduced

Second, manufacturing is very difficult: especially the verticality of the inner and outer tube sheets and the concentricity of the tube holes are very strict

In actual manufacturing, it often happens that the heat exchange tubes cannot pass through the inner and outer tube sheets at the same time, or they barely pass through at the same time but the expansion joint strength is not enough due to the need for excessive hole expansion

Third, the production cost is high: each heat exchanger requires two more tube sheets, which significantly increases the investment, and in actual design, the thickness of the inner and outer tube sheets is usually almost the same, which does not play a role of mutual reinforcement

[0006] In short, the performance of the double-tube-sheet heat exchanger is relatively superior, but its complex structure, difficult processing, and high manufacturing cost obviously limit its application in the industrial field; compared with the single-tube-sheet heat exchanger, The application ratio of double tube sheet is extremely low

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