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Tubular heat exchangers: classic industrial heat exchange equipment with robust structure and wide application.
Tubular heat exchangers are the most classic and widely used type of industrial heat exchange equipment. Their core structure consists of a series of metal tube bundles, which facilitate heat transfer between two fluids through the tube walls.
I. Basic Structure and Working Principle
Tubular heat exchangers mainly consist of a shell, tube bundles, tube sheets, end caps, and baffles. One fluid flows inside the tubes (tube side), while the other fluid flows outside the tubes and inside the shell (shell side). Heat is conducted from the high-temperature fluid to the low-temperature fluid through the tube walls. Based on structural differences, they can be classified into various types, including fixed tube sheet type, floating head type, U-tube type, and stuffing box type. The floating head design, due to its free thermal expansion, is suitable for conditions with large temperature differences.
II. Main Features and Advantages
This type of heat exchanger has significant advantages such as robust structure, high pressure resistance, and adaptability to high-temperature and high-pressure environments. Metal tubes can be made of carbon steel, stainless steel, copper alloys, or titanium to cope with the corrosiveness of different media. Their manufacturing process is mature, with few sealing points, high reliability, and easy cleaning and maintenance—scale inside the tubes can be removed mechanically. Furthermore, by increasing or decreasing the number of tubes or adjusting the number of tube passes, different heat exchange load requirements can be flexibly adapted.
III. Application Areas
Tubular heat exchangers dominate the petrochemical industry, commonly used in the heating and cooling stages of crude oil distillation, catalytic cracking, and hydrorefining units. In the power industry, they are the core equipment of condensers in thermal power plants. They are also widely used in pharmaceuticals, food processing, refrigeration and air conditioning, and nuclear energy, handling various fluids from ordinary water to corrosive chemical media.
IV. Technological Development Trends
Modern tubular heat exchangers are developing towards higher efficiency and compactness, improving heat transfer efficiency through measures such as using enhanced heat transfer tubes (e.g., corrugated tubes, finned tubes) and optimizing baffle structures (e.g., replacing bow-shaped baffles with spiral baffles). The application of new materials and computational fluid dynamics (CFD)-aided design have further driven technological innovation in this traditional equipment.
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