Caracole-type zigzag-plane baffle plate shell-and-tube heat exchanger

Abstract

A caracole-type zigzag-plane baffle plate shell-and-tube heat exchanger comprises caracole-type zigzag-plane baffle plates. Each caracole-type zigzag-plane baffle plate is composed of a first surface plate, a second surface plate and a third surface plate. The first surface plates and the third surface plates are parallel to the plane of a tube bundle tube plate, the bent angle theta is formed between the second surface plates and the plane of the tube bundle tube plate, and the bent degree between the first surface plates and the second surface plates is the same as the bent degree between the second surface plates and the third surface plates. During installation, a pull rod and pipe spacers are used for locating the first caracole-type zigzag-plane baffle plate in a tube bundle, then the second caracole-type zigzag-plane baffle plate is turned over by 180 degrees relative to the installed first caracole-type zigzag-plane baffle plate and placed on the right side of the first caracole-type zigzag-plane baffle plate in the axial direction of the tube bundle, the adjacent surface plate parts of the two baffle plates are adjusted to enable the surface plate parts to coincide with one another, then the pull rod and the pipe spacers are used for location, and the steps are repeated until tube bundle installation is completed. The caracole-type zigzag-plane baffle plate shell-and-tube heat exchanger is simple both in structure and installation method, good in heat transmission performance and smaller in resistance; the caracole-type zigzag-plane baffle plate shell-and-tube heat exchanger is high-efficiency energy-saving equipment and is easy to popularize and apply.

Description

technical field [0001] The invention relates to the technical field of shell-and-tube heat exchangers, in particular to a shell-and-tube heat exchanger with folded surfaces and baffles of spiral ladders. Background technique [0002] Looking at the baffles of shell and tube heat exchangers, there are two types of baffles: arcuate baffles and spiral baffles. [0003] With bow-shaped baffles, the fluid flows in a zigzag shape in the shell side, and there are throttling and flow dead zones in the flow; resulting in large pressure drop in the shell side, low film coefficient, easy scaling, easy vibration and other unfavorable factors, gradually in recent years. Replaced by spiral baffles. [0004] Compared with the bow-shaped baffle, the heat exchanger using the spiral baffle, the fluid rotates around the axis of the tube bundle in the shell side, and there is no throttling and flow dead zone in the flow; the resistance of the shell side is reduced, and the film heat transfer c...

AI Technical Summary

Problems solved by technology

However, in the process of use, it is found that compared with the bow-shaped baffle heat exchanger, the improvement of the heat transfer coefficient is not obvious, especially in the case of unsatisfactory process calculation optimization, and even the total heat transfer coefficient of the initial operation of the equipment is low. Phenomenon in bow-shaped baffle heat exchangers

This is because a gap will be formed at the overlap between two adjacent baffles, and a fast flow path will be formed at the gap, resulting in a partial short circuit of the shell-side fluid, which is not conducive to heat exchange

The total heat transfer coefficient of spiral baffle heat exchangers currently on the market is not very large

[0005] In addition, one screw pitch in the tube bundle of the spiral baffle heat exchanger is composed of four baffles, so there are many baffles in a tube bundle, the installation is difficult, the roundness and concentricity of the tube bundle are not guaranteed, and the rigidity of the tube bundle is not too high. it is good

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