How should this heat exchanger be selected?

It’s available on this forum; just look carefully in the equipment selection section

At a temperature like this, a fixed tube sheet type can be used

Chapter 4 Selection of Heat Exchanger Structure 4.1 Shell and Tube Heat Exchangers The figure below shows a schematic view of the simplest shell and tube heat exchanger. His heat transfer surface is composed of a tube bundle; the ends of the tubes are fixed to the tube sheets, and the tube bundle along with the tube sheets are then enclosed within a shell. The two ends of the shell are equipped with end caps; a fluid (cold fluid in this diagram) flows into the tube through the inlet end cap and then exits through the outlet end cap. This path is referred to as the tube side. Another fluid enters and exits the heat exchanger through a connection pipe on the shell; this path is referred to as the shell side. Figures 1-2 show a two-tube side and one shell side, which is technically referred to as a 1-2 type heat exchanger (here, 1 denotes the number of shell sides and 2 denotes the number of tube sides). Similarly, connecting several shell sides in series can also yield a multi-shell-side structure. As can be seen from the diagram, the fluid in the tube side and the fluid in the shell side do not mix with each other; heat is exchanged only through the tube walls. At the same flow rate, the heat transfer effect when the fluid flows transversely across the tube is not as good as when it flows longitudinally along the tube surface. Therefore, baffle plates are generally installed inside the shell to improve heat transfer in the shell side. The flow pattern in the illustrated heat exchanger is counterflow; it can also be arranged as co-flow, in which case only the inlet positions of the two fluids need to be swapped. Figure 4-1 Schematic diagram of a simple shell-and-tube heat exchanger. Shell-and-tube heat exchangers have been in use for a very long time. Today, it is used extensively as a traditional standard heat exchange device in many industrial sectors; particularly in industries such as chemicals, petroleum, and energy equipment, shell-and-tube heat exchangers still hold a dominant position. Generally speaking, this type of heat exchanger is easy to manufacture, has low production costs, a wide range of available materials, is easy to clean, highly adaptable, capable of handling large volumes of fluid, reliable in operation, and can withstand high temperatures and pressures. Although it cannot compete with plate or finned heat exchangers in terms of structural compactness, heat transfer efficiency, and metal consumption per unit area of heat transfer, it remains dominant due to the aforementioned advantages. As heat exchangers evolve toward higher temperatures, greater pressures, and larger capacities, shell-and-tube heat exchangers have gained even more significance. The structural types of shell-and-tube heat exchangers are also diverse. Based on the design of the tube sheet, the shell, and their mating parts, they can be classified into fixed-tube-sheet type, floating-head type, stuffing-box type, U-tube type, kettle type, and others. 4.2. Structural features of the floating-head heat exchanger: The floating-head heat exchanger incorporates structural improvements to address the shortcomings of the fixed-tube-sheet type. In such heat exchangers, only one end of the tube sheets is fully fixed to the shell, while the other end can move relative to the shell. The tube bundle in these exchangers is not constrained by the shell, so no thermal stress arises between the shell and the tube bundle due to differences in expansion amounts. Additionally, during cleaning and maintenance, it is sufficient to pull the tube bundle out from the fixed end; hence, this type of heat exchanger is suitable for applications where there is a large temperature difference between the shell and the tubes, or where corrosion and scaling are likely to occur. However, this type of heat exchanger has a complex structure and is bulky; its cost is about 20% higher than that of the fixed-tube-sheet type. It also requires a large amount of material. Moreover, since the end caps of the floating head cannot be inspected during operation, special attention must be paid to its sealing during manufacturing and installation to prevent internal leaks. The gap between the tube bundle and the shell is large; short circuits must be avoided during design. As for the pressure in the shell side, it is also limited by the sealing of the sliding contact surface. Floating-head shell and tube heat exchangers can be further divided into various types, such as the floating-head with tubes passing through it, the type with a filling ring added outside the floating head, the type with a lining ring at the opening of the floating head, and the type with a packing box outside the floating head. In this design, the inlet and outlet temperatures for the two fluids are: 180/40°C for the tube side, and 30/40°C for the shell side. The temperature difference between the two fluids is: Therefore, thermal compensation needs to be considered; the expansion joint method is only suitable for temperature differences of less than 70°C. Hence, the design of this heat exchanger must use a floating-head type structure. :P. This is taken from my graduation project description; I hope it will be helpful to you

Features of the floating-head heat exchanger: One tube sheet in the heat exchanger is clamped between the shell flange and the tube box flange using bolts, while the other tube sheet can move freely along the axial direction. When the tube bundle and the shell expand due to heating at different rates, they do not restrict each other, thus no thermal stress is generated. The tube bundle can be removed to facilitate cleaning of the dirt on the inner and outer surfaces of the tubes. The floating head section consists of a floating head tube sheet, girth rings, and floating head end caps, and it has a detachable structure that facilitates manufacturing, installation, and maintenance. However, the floating head end cap components cannot be inspected during operation; therefore, special attention must be paid to their sealing performance during manufacturing and installation to prevent internal leaks. The overall structure of a floating-head heat exchanger is relatively complex, and a large amount of metal is required for the floating head, resulting in a cost that is about 20% higher than that of a fixed-tube-sheet type heat exchanger. However, due to the aforementioned characteristics, it is suitable for applications where there is a large temperature difference between the pipe and shell walls, and where the medium tends to form scale and requires cleaning; as a result, it is widely used in petrochemical system installations. The floating-head type is generally preferred, but it requires a large amount of metal, resulting in costs that are about 20% higher than those of the fixed-sheet plate type

Plate heat exchangers can be used; they occupy less space, are easy to maintain, and have high heat exchange efficiency. You just need to provide the heat exchanger manufacturer with your process conditions, and the manufacturer will select the appropriate model for you.

Reply: Tube side, shell side; inlet temperature: 120, 33; outlet temperature: 95, 43. Fluid: 95% acetic acid + water. Circulating cooling water. Design pressures: 0.3 MP, 0.7 MP. Is it true that if the temperature difference between the tube side and the shell side exceeds 70, a fixed-tube-plate heat exchanger cannot be used? Last edited by zhangyong6404 on 2009-3-20 19:18.]