The structural function of the stuffing-type heat exchanger is that only one end of the tube plate is fixedly connected to the casing, and the other end is sealed by a stuffing box. The tube bundle can be freely stretched and does not cause temperature difference stress caused by the temperature difference between the shell wall and the tube wall.
The advantage of the stuffing type heat exchanger is that the structure is simpler than the floating head heat exchanger, the manufacturing is convenient, the consumables are small, and the cost is low; the tube bundle can be taken out from the casing, and the tube and the tube can be cleaned and maintained conveniently. The disadvantage is that the stuffing box pressure is not high, generally less than 4.0 MPa; the shell-side medium may leak through the stuffing box, which is not suitable for flammable, explosive, toxic and valuable media. The stuffing box heat exchanger is suitable for occasions where the temperature difference between the tube and the shell wall is large or the medium is easy to scale, which needs to be cleaned frequently and the pressure is not high.
The structure of the kettle heat exchanger is characterized in that an appropriate evaporation space is arranged on the upper part of the casing, and at the same time, it also functions as a steam chamber. The tube bundle can be a fixed tube plate type, a floating head type or a U-shaped tube type. The kettle heat exchanger is easy to clean and maintain, can handle unclean, easy to scale media, and can withstand high temperature and high pressure. It is suitable for liquid-vapor heat exchange and can be used as the simplest structure waste heat boiler.
In addition to the above five types of shell-and-tube heat exchangers, there are other types such as intubation heat exchangers and sliding tube plate heat exchangers.