Questions about baffle plates and support plates?

The support plate only serves to support the tube bundle; it does not provide flow deflection. In contrast, the baffle plates can function to deflect the flow, thereby enhancing the heat exchange efficiency

The structural design of the baffle plates should be determined based on the process requirements, primarily to increase the flow velocity within the pipes and thereby enhance heat transfer efficiency. Support plates: Horizontal heat exchangers generally have baffle devices that serve to disrupt the flow of fluid and provide support. However, when there is no need for baffles due to process requirements, and when the heat exchange tubes are relatively long and thin, or when the floating head end of a floating-head heat exchanger is heavy, or when the tubes in a U-tube heat exchanger are long, a certain number of support plates must be used to prevent the tubes from deforming.

Like the support plates, the baffle plates also provide support for the tube bundle; their tube holes, outer diameters, and notch shapes are all the same； As mentioned above, the requirement regarding baffle design is to increase the flow velocity between the tubes in order to improve heat transfer, or to reduce that flow velocity in order to minimize the pressure loss in the shell side ； The support plate is a requirement of mechanical design; it is added to reduce the unsupported length of the heat exchange tubes and enhance their stiffness ； From a process perspective, some heat exchangers do not require baffle plates (such as in steam condensation). However, from a mechanical standpoint, the unsupported length of the heat exchange tubes may be too long, leading to instability and vibration; therefore, it is necessary to reduce this unsupported length by adding support plates. These support plates have the same dimensions as the baffle plates and are installed in the same way, which makes it difficult to distinguish between baffle plates and support plates.

1. The function of baffle plates is mainly to determine the flow path and flow rate of the fluid (medium). Support plates, as the name implies, serve a supporting role, helping to improve the structural stress conditions and prevent deformation. For example, in floating-head heat exchangers, support plates are usually installed at the floating-head end to reduce the cantilever force on the floating head and prevent it from sagging, which could affect assembly. 2. The position of the baffle plates is designed based on the flow path and flow rate of the fluid (medium), and the physical properties of the medium under operating conditions also serve as an important basis for determining the size and orientation of the baffle plate openings. Getting as close as possible to the inlets and outlets is intended to make full use of the limited space at both ends, thereby optimizing the flow paths for the hot and cold media and achieving a higher heat exchange efficiency.

Thank you to all the forum members for their discussions! I believe that issues and questions become clearer the more they are discussed; among any three people, there is always one I can learn from! That’s exactly what it means! I have been reviewing floating-head heat exchangers, and it turns out that in all of them the elements are described as baffle plates, with no support plates present. By referring to GB151, I still didn’t understand the difference between the two. Progress can only be made through learning, and it is only through discussion that one can acquire knowledge that cannot be learned on one’s own! Finally, I sincerely thank all the friends who have replied and read the post!