The plate heat exchanger is used relatively frequently in our daily life. It has the characteristics of high heat exchange efficiency and compact structure, which is welcomed by more and more users. Below we introduce the conditions under which the plate heat exchanger will be corroded:
Due to the unqualified water quality and the improper operation of the water treatment equipment, and the temperature difference between the hot and cold media, it is easy to form scales (carbide, silica scale) on the surface of the plate heat exchanger, and then cause poor heat conduction and heat exchange. Falling, severe pitting and perforation leakage will occur, at the gaps such as the bottom of the gasket gasket of the plate heat exchanger, or outside the corner gasket of the plate closing the flow channel.
It will form a dwelling of the medium, and the gap corrosion leakage will occur here due to the electrochemical heterogeneity of the dwelling medium. The plate heat exchanger plate will have a certain residual internal stress during the manufacturing restraint process. Concentrated halogen ions (such as chloride ion plasma) or H2S long-term touch may cause stress corrosion cracking of the plate.
The stainless steel plate of the plate heat exchanger constitutes intergranular corrosion during the welding process, the material of the plate heat exchanger is not selected properly or the service life is too long, and the allowable service life constitutes leakage, equipment, or the clamping bolts are tight when disassembled and cleaned. Uneven solidity, when the gaskets and plates are misaligned and leaked. When there is equipment, there are sand, oil, iron filings and fluxes on the gaskets and in the gasket grooves. The sealing surface is damaged and leaks.
The use of the plate heat exchanger in the boiler water supply: energy saving, the direct connection of the plate heat exchanger system during heating is more energy-saving and environmentally friendly than the direct heating system. Boiler protection: The boiler is used as a heat source to protect the boiler from scale. Because the boiler water is circulated separately after the plate heat exchanger is added, there is basically no large amount of external water inflow.
The above is an introduction to the conditions under which the plate heat exchanger is corroded. In the process of using the plate heat exchanger, we still need to regularly repair to ensure the normal operation of the plate heat exchanger equipment.