Plate heat exchanger repair: What will the plate heat exchanger corrode? _
474 Workers who often operate plate heat exchangers will know that sometimes plate heat exchangers will corrode. What is the reason? In fact, how many reasons are caused by improper operation. Today I will give you a small series. Share plate heat exchanger repair: what will the plate heat exchanger corrode? (1) Stainless steel heat transfer plates are stamped mechanically, and a certain amount of surface residual stresses inevitably remain. For stainless steel sheets that do not contain molybdenum, the elimination of surface residual stresses is very difficult or even impossible . (2) After the plates are assembled, a multi-slit structure is formed, such as the contacts between the plates and the bottom of the sealing groove. The gaps can easily cause the enrichment of Cl-, and the degree of local enrichment often far exceeds the ability of stainless steel to resist stress corrosion. (3) When the dirt on the surface of the plate is severe, the corrosive elements (Cl, S, etc.) in the intermediary may adhere to the dirt in large amounts and accumulate in the cracks at the bottom of the dirt. (4) Harmful elements in the bottom of the sealing groove are often precipitated by Cl in the binder due to temperature rise. For example, in the neoprene series of adhesives and compressed asbestos (containing CaCl2), under the conditions of water and steam, the precipitated enriched Cl- and H+ form HCl, causing severe stress corrosion cracking at the bottom of the groove. The editor of the above article shared with you the maintenance of plate heat exchangers: What will the plate heat exchanger corrode? If you have any questions about the maintenance of the plate heat exchanger, you are welcome to consult on the official website of Junjie Technology.