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What is the difference between a shell and tube heat exchanger and a shell and tube heat exchanger? Different usage

January 06, 2020 09:40:27 Source: Pharmaceutical Network Popularity: 6954


[ Industry News of Food Machinery and Equipment Network ] In the fields of food and medicine, heat exchangers are common equipment. Recently, some users wanted to purchase a heat exchanger, but hesitated between the tube-and-tube heat exchanger and the shell-and-tube heat exchanger. I don't know the difference between the two. So what is the difference between these two types of heat exchangers? In this regard, a technician from a heat exchanger manufacturer made a brief introduction.
Use differently
From the point of view of the structure of the two, the tube and tube heat exchanger and the shell and tube heat exchanger are basically the same in terms of structure, but they are used in different ways.
Among them, the tube-and-tube heat exchanger is the liquid-liquid tube-passing path, that is, the tube inside; the cooling water shell-passing path, that is, between the tube and the shell. The shell-and-tube heat exchanger does the opposite.
Effect is different
According to reports, the tube bundle of the tube-and-tube heat exchanger is connected to the tube sheet, and the tube sheet is welded to the two ends of the shell, respectively, and a top cover is connected to the top cover and the casing, which are connected to the fluid inlet and outlet. A series of baffles perpendicular to the tube bundle are usually installed outside the tube.
At the same time, the connection between the tube and tube sheet and the shell is rigid, while the inside and outside of the tube are two different temperature fluids. Therefore, when the temperature difference between the tube wall and the shell wall is large, due to the different thermal expansion of the two, a large temperature difference stress is generated, so that the tube is twisted or the tube is loosened from the tube sheet, and the heat exchanger is even destroyed.
The shell and tube heat exchanger consists of a shell, a heat transfer tube bundle, a tube sheet, a baffle plate (baffle plate) and a tube box. The shell is mostly cylindrical, and a tube bundle is installed inside, and the two ends of the tube bundle are fixed on the tube sheet.
There are two kinds of hot and cold fluids for heat exchange, one is flowing inside the tube, which is called the tube side fluid; the other is flowing outside the tube, which is the shell side fluid. In order to improve the heat transfer coefficient of the fluid outside the tube, several baffles are usually installed in the shell. The baffle can increase the velocity of the shell-side fluid, forcing the fluid to pass through the tube bundle laterally for multiple times according to the prescribed distance, and enhancing the degree of fluid turbulence.
Ease of cleaning
It is understood that the structure of the tube-and-tube heat exchanger is relatively simple, compact and inexpensive, but mechanical cleaning cannot be performed outside the tube.
The shell-and-tube heat exchange tubes can be arranged in equilateral triangles or squares on the tube sheet. The equilateral triangle arrangement is relatively compact, the fluid outside the tube has a high degree of turbulence, and the heat transfer coefficient is large; the square arrangement is convenient for cleaning outside the tube, and is suitable for fluids that are prone to scaling.
The author understands that at present, many tube-and-tube heat exchanger manufacturers have improved the conventional structure, and the double-tube-sheet-tube-and-tube heat exchangers developed by them can be used in working conditions with high sanitary requirements. The inside of the heat exchange tube is easy to be completely emptied and kept clean, and the double-tube-sheet structure avoids the risk of cross-contamination of the conventional heat exchanger. And the integrated structural design, without any sealing elements, can be maintenance-free.
Conclusion
No matter what kind of heat exchanger, its role is different, and it is also useful in the corresponding field. For heat exchanger manufacturers, what needs to be done is to keep aggressive, center on user needs, seize the development trend of the industry, keep up with the policy direction, continue to innovate and upgrade, improve equipment, and help users to develop better. For example, driven by the concept of energy saving and efficiency improvement, heat exchanger equipment manufacturers need to move in the direction of more energy-efficient and green development, help enterprises reduce costs, and make enterprises meet the needs of sustainable development. In addition, under the current fierce competition in the heat exchanger market, manufacturers also need to consider these aspects to improve competitiveness.

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