The shell fluid passes through the shell side once, called a single shell. In order to increase the flow rate of the shell fluid, a longitudinal partition may be placed in a direction parallel to the bundle axis to divide the shell length into multiple passes. The number of shells is the number of times the shell fluid travels back and forth along the axial direction of the shell in the shell.
The splitting process can increase the flow rate of the shell fluid, increase the flow, and increase the disturbance, which helps to enhance heat transfer. However, the shell-side splitting not only increases the flow resistance, but also makes manufacturing and installation more difficult, so it is less used in engineering. In order to improve the shell-side heat transfer, a baffle baffle is usually used, and a baffle baffle is provided to achieve the purpose of enhancing heat transfer.
The advantage of the fixed tube plate heat exchanger is that the structure is simple and compact. Within the same housing diameter, the number of tubes is the largest and the bypass is the least; each heat exchange tube can be replaced and the tube is easily cleaned. The disadvantage is that the shell process cannot be mechanically cleaned; when the temperature difference between the heat exchange tube and the shell is large (greater than 50 ° C), temperature difference stress is generated, and the expansion joint is required on the shell, so the shell side pressure is limited by the strength of the expansion joint. Can't be too high.
The fixed tube plate heat exchanger is suitable for the case where the shell side fluid is clean and not easy to scale, and the temperature difference between the two fluids is not large or the temperature difference is large but the shell side pressure is not high.
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