Plate heat exchanger is a very effective heat exchange equipment. Wards are widely used in chemical, food and steel industries. The core components of plate heat exchangers are plate heat exchanger plates and sealing rubber pads. The development level of heat exchanger seal pads directly determines the development level of plate heat exchangers because seal failure is a common problem of heat exchangers. What is the problem of the plate heat exchanger gasket damage?
(1) The working pressure of the heat exchanger exceeds the design pressure
Removable plate heat exchangers produce leaks when used in the rated working pressure. In addition to the quality problems of the device during manufacturing and assembly, it is generally related to the abnormal impact load in the system. The instantaneous pressure peak is often about 2 times higher than the normal working pressure to displace the rubber gasket installed in the plate heat exchanger, making the plate heat exchanger sealing failure. Because the heat transfer element of the plate heat exchanger is made of stainless steel thin plate, its sealing rigidity is relatively poor. The sealed periphery of the heat exchanger is very long, so the impact resistance performance is lower than the shell and tube heat exchanger.
(2) Long placement time of plate heat exchanger
For heat exchange equipment that has been used or left idle for several years, the self-aging of the sealing material may affect the reliability of the seal, so the maintenance opportunity should be used to replace the new gasket in time.
(3) The temperature of the heat exchanger fluid changes rapidly
Rapid changes in the temperature of the heat exchange medium can also cause seal failure. When the fluid temperature changes rapidly, the linear expansion coefficient and elastic deformation of the rubber gasket and the preload of the seal will not match, so that the reduced preload of the seal will cause the pressure bearing of the device to be much lower than the rated design pressure.