The plate heat exchanger is composed of a set of metal plates. The plate has four corner holes for the passage of cold and hot media. When the heat exchanger is assembled, the A plate and the B plate are alternately arranged to form a mesh channel. The gasket seals the hot and cold media in the heat exchanger, and reasonably separates the hot and cold media without mixing. The hot and cold fluid in the channel flows at intervals, and can flow countercurrently or downstream as needed. What are the reasons for the wear of plate heat exchangers during use?
① The background vibration of the environment is large. When there is a large vibration source due to machine vibration in the environment, the vibration is transmitted to the plate heat exchanger, which may cause slight friction between the plates, thereby causing the plates to wear. We should try our best to place the plate heat exchanger away from the vibration source or take vibration damping measures, such as setting up a rubber damping foundation.
②Frequent startup and shutdown of equipment or unstable fluid flow through both sides of the plate. The fixing between the plates of the plate heat exchanger is provided by the contact points between the plates and the rubber sealing strips on the edges. When the fluid flow and pressure change, the contact point between two adjacent plates produces alternating stress and deformation, and may cause a small displacement. This is the main cause of fretting wear. The way to avoid and reduce fretting wear is to improve the process flow, reduce the number of start and stop of the equipment, and minimize the fluctuation range of the fluid flow flowing through both sides of the plate.