The plate heat exchanger has the characteristics of high heat transfer coefficient, small pressure drop, compact structure, light weight, small space occupation, convenient process combination, strong versatility of parts, wide selection of materials, and easy realization of large-scale production. It has been widely used In the fields of food, machinery, metallurgy, petrochemicals and ships, it has become the leading heat exchange equipment in urban central heating projects. What are the common failures of plate heat exchangers?
(1) Leakage is mainly manifested as leakage (not large volume, continuous water droplets) and leakage (large volume, continuous water droplets). The main parts of external leakage are the seals between the plates, the second leakage seal grooves of the plates, and the inside of the end plates and the compression plate.
(2) The main feature of the string fluid is that the medium on the higher pressure side is stringed into the medium on the lower pressure side, and abnormalities in pressure and temperature will occur in the system. If the medium is corrosive, it may also cause corrosion of other equipment in the pipeline. The liquid flow usually occurs in the diversion area or the second sealing area.
(3) The pressure drop of the medium inlet and outlet pressure exceeds the design requirements, and even many times higher than the design value, which seriously affects the system's flow and temperature requirements. In the heating system, if the pressure drop on the hot side is too large, the primary flow will be seriously insufficient. That is, the heat source is insufficient, resulting in the secondary side outlet temperature not meeting the requirements.
(4) The heating temperature can not meet the requirements. The main feature is that the outlet temperature is low, which does not meet the design requirements.