When should a heat exchanger be equipped with a bypass baffle?

The main purpose is to increase the heat exchange effect and avoid dead zones.

The distance between the outer wall of the heat exchange tube and the inner wall of the cylinder is relatively large, which may easily cause a short circuit of the shell side medium. This setting is required. There are no specific regulations, and the designer will consider it at his or her discretion during design.

When arranging heat exchange tubes, when the surrounding spacing is large, bypass baffles should be installed to enhance the heat exchange effect.

This post was last edited by jia717 on 2009-9-8 22:39. For example, the U-shaped tube heat exchanger cannot have tubes arranged in the middle, and a bypass baffle is installed when the tube spacing is particularly large.

To correct someone upstairs, the U-shaped tube heat exchanger cannot have tubes arranged in the middle. When the tube spacing is particularly large, an intermediate baffle or tube baffle is installed. I personally think that the outer wall of the heat exchange tube of the floating head heat exchanger is far away from the inner wall of the cylinder, which can easily cause a short circuit of the shell-side medium, and a bypass baffle needs to be installed.

At this time, it is necessary to set up an intermediate baffle or pipe baffle.

On GB151, the distance between the outer wall of the heat exchange tube and the inner wall of the cylinder is relatively large, which may easily cause a short circuit of the shell side medium and requires setting.

To prevent short circuits, generally the space between the inner walls of the shell in the pipe layout area is relatively large, and the fluid will take shortcuts. The general design uses the slideway as a bypass baffle.

To prevent the circumferential short-circuit flow of the shell-side fluid and increase the heat transfer efficiency, there are similar accessories such as guide tubes, false tubes, etc., which are clearly stipulated in GB151

Increase the flow damping of the medium in areas without pipes, reduce the occurrence of leakage, and improve heat exchange efficiency

This problem can be easily solved based on the purpose of setting up a bypass baffle or tube baffle. The reason for setting up a bypass baffle is to prevent the medium from short-circuiting or forming a "dead zone" in the shell side, which affects the heat exchange effect. A more reliable method is to simulate hydraulics, input the medium characteristics and its path into the computer and run it. The effect is relatively intuitive. However, unless operating conditions such as nuclear power or aerospace are relatively harsh and the working conditions are special, equipment in petrochemical and other industries can fully meet process requirements based on engineering experience. The first thing to recommend is the relevant recommended practices in the standards, and then larger design institutes will also have their own experience summaries, which are also worth learning from in engineering. :)

According to GB/T151, when the short circuit width exceeds 16mm, an anti-short circuit structure should be installed.