Plate heat exchanger has been widely used in food, machinery, metallurgy, petrochemical industry and ships, etc. plate heat exchanger has the characteristics of high heat transfer coefficient, small pressure drop, compact structure, light weight, small space occupied, convenient combination of area and process, strong universality of parts, wide selection of materials and easy to realize large-scale. And become the leading heat exchange equipment in rural central heating project. In order to ensure the normal operation of plate heat exchanger, it is very important to extend the service life of key parts such as plate and rubber pad, and to master the failure and the causes and treatment methods of plate heat exchanger.

Plate heat exchanger is a very effective heat exchange equipment, which is widely used. The core parts of plate heat exchanger are plate heat exchanger plate and sealant gasket. The development level of the gasket directly determines the development level of plate heat exchanger. The seal failure of plate heat exchanger is very important. So what is the reason for the failure of plate heat exchanger seal?

1 pressure effect

When the removable plate heat exchanger is used in the rated working pressure, leakage occurs. Besides the quality factors of the device in the manufacturing and assembly, it is generally related to abnormal impact load in the system. This is a situation that ordinary operators are not easy to view. The peak pressure caused by impact is often about twice higher than the normal working pressure, The rubber gasket installed in the plate heat exchanger is displaced, which makes the plate heat exchanger seal invalid. Because the heat transfer element of this kind of device uses stainless steel sheet, its sealing rigidity is relatively poor, and the sealing periphery is very long, so the performance of impact resistance is lower than that of shell and tube heat exchanger.

2 time impact

The aging of sealing materials may affect the sealing reliability of equipment used or idle for several years. Therefore, new sealing gasket should be replaced timely by using the opportunity of maintenance

3 temperature effect

The rapid change of temperature can also lead to seal failure. When the temperature changes rapidly, the linear expansion coefficient, elastic deformation and sealing preload of rubber gasket will not match, which will reduce the sealing preload force, which leads to a much lower pressure bearing capacity of the device than the rated design pressure.