What are the causes of failure of plate heat exchanger?
Plate heat exchanger jam Port clearance of plate heat exchanger (2.5 to 6.0 mm), small diameter greater than 1.5 to 1.5 second stuff easy blocking, lead to equipment failure due to congestion. Precautions: In setting coarse screen pack or medium inlet flushing device, can effectively prevent the equipment of congestion, improve the effect of heat transfer.
Here's why: 1, the plate heat exchanger is material pressure fluctuations, or working temperature is too high; 2, gasket long-term use of cracks, aging; 3, plate produce permanent deformation, not fixed gasket; 4, the surface of the plate heat exchanger or channel with low thermal conductivity materials produce congestion; 5 of plate heat exchanger, plate heat exchanger fouling scale results in the decrease of the heat transfer coefficient of heat transfer equipment
Seal failure Plate heat exchanger leakage within the rated pressure, in addition to the equipment manufacture factors, mainly related to the system pressure and temperature of dramatic change. Impact the instantaneous pressure drop caused by the often 2 to 3 times higher than normal pressure, the installation of the rubber gasket displacement, lead to seal failure. When the temperature changes too fast, the elastic and sealing gasket pre-tightening force does not match, equipment bearing capacity is lower than the rated design pressure and leak. Precautions: 1. In the operation to avoid shock phenomenon in a system. 2. According to the condition of operating pressure increase 1.5 2.0 times the design pressure of the equipment. 3. Other measures of prestressing force compensation seal change. 4. In the operation, should try to slow warming and process of pressure
Scale will lower the heat transfer coefficient of plate heat exchanger, serious blocking plate channel. Plate heat exchanger plate design of contact with a lot of support, is easy to gather solid impurities or fibers, easy to make the fluid to form local retention and scaling. Ca2 +, in addition, the medium magnesium 2 + can precipitate solid form scale, fouling and plugging formation is different, but the impact is the same. Precautions: 1, the plate heat exchanger should not be used in a dirty or easy scaling of the environment. 2, made of not soften water medium, operating temperature should be controlled under 50 ℃.
