The plate heat exchanger has the characteristics of high heat transfer coefficient, small pressure drop, compact structure, light weight, small space occupation, convenient combination of area and process, strong versatility of parts, wide choice of materials and easy realization of large-scale production. It has beed widely used in food, machinery, metallurgy, petrochemical and shipbuilding, and become the leading heat exchange equipment in urban central heating projects. In order to ensure the normal operation of the plate heat exchanger and prolong the service life of key components (such as plates and pads), it is particularly important to understand the failures of the plate heat exchangers. What are the common faults of plate heat exchangers?
(1) External leakage, mainly manifested as leakage (not large amount, water droplets are discontinuous) and leakage (large amount, continuous water droplets). The main part of the external leakage is the seal between the plate and the plate, the two sealing leaking groove parts of the plate and the inner side of the end plate and the pressing plate.
(2) The heating temperature cannot meet the requirements. The main feature is that the outlet temperature is too low to meet the design requirements.
(3) The pressure drop is large, the pressure drop of the medium inlet and outlet exceeds the design requirements, and even higher than the design value many times, which seriously affects the system's requirements for flow and temperature. In the heating system, if the pressure drop on the hot side is too large, the primary side flow will be seriously insufficient, that is, the heat source is insufficient, and the secondary side outlet temperature cannot meet the requirements.