At present, the types of heat exchangers commonly used include floating head type, fixed tubesheet type and U-shaped tube type, most of which are floating head type heat exchangers.
Due to its own structure, the application occasions of fixed tubesheet heat exchanger are limited. There are many parts of floating head heat exchanger, which is easy to disassemble and clean, but the maintenance workload is large and easy to internal leakage. However, the tubesheet of U-shaped tubesheet heat exchanger is less than that of fixed tubesheet heat exchanger, and its leakage points are reduced accordingly.
In addition, the U-tube heat exchanger is easy to dry after the shell side hydrostatic test, and it has a wide range of applications, simple maintenance and good operation flexibility.
Each steel pipe on the tube side of the U-shaped tubular heat exchanger is bent into a U shape, and both ends of the steel pipe are respectively installed on the same side of the same fixed tubesheet. The head is separated into two chambers by a diaphragm, and each pipe can shrink automatically.
It has nothing to do with other pipes and shells. It can be used even when the temperature difference between shell and pipe is very large. In actual production, U-tube heat exchanger is often used to cool high-temperature gas with circulating water. After corrosion or leakage of heat exchanger tubes, only the core can be changed and should not be cleaned.
U-shaped heat exchanger is a kind of tube heat exchanger. The working principle of heat exchanger is to transfer heat from high temperature end to low temperature end.
Heat exchanger is widely used in automobile, aviation, petrochemical, power, medicine, metallurgy, refrigeration, light industry, food, engineering machinery and other industries, accounting for about 20% ~ 70% of the total process equipment. According to the shape and structure of its heat transfer surface, it can be divided into tube type, plate type and other forms of heat exchangers.