In addition to water, Most of the media used in plate heat exchanger are lean solution, rich solution, sodium hydroxide, sulfuric acid and other chemical media, which is easy to cause corrosion of plate and swelling and aging of gasket.
Plate and gasket are the core elements of plate heat exchanger, So the selection of plate and gasket material is particularly important.
Plate material selection of plate heat exchanger:
|Purified water, river water, edible oil, mineral oil and other media||stainless steel (AISI 304, AISI 316, etc.).|
|seawater, brine, salinization and other media||titanium and titanium palladium(Ti, Ti-Pd)|
|Dilute sulfuric acid, dilute sulfur salt aqueous solution, inorganic aqueous solution and other media||20Cr, 18Ni, 6Mo (254SMO) and other alloys|
|High temperature and high concentration caustic soda medium||Ni|
|Concentrated sulfuric acid, hydrochloric acid and phosphoric acid medium||Hastelloy alloy (C276, d205, B20)|
Material selection of gasket for plate heat exchanger:
Most people know that rubber sealing gaskets are commonly used materials, such as EPDM, nitrile rubber, hydrogenated nitrile rubber, fluororubber and so on.
|EPDM||The service temperature is – 25 ~ 180 ℃. It is suitable for fluid medium superheated water, steam, atmospheric ozone, non petroleum based lubricating oil, weak acid, weak base, ketone, alcohol, ester, etc.|
|NBR||The service temperature is – 15 ~ 130 ℃. It is suitable for various mineral oil products such as fluid medium, light fuel oil, lubricating oil, animal and vegetable oil, hot water, salt water, etc.|
|HNBR||The service temperature is – 15 ~ 160 ℃. It is suitable for fluid medium high-temperature water, crude oil, sulfur-containing oil and organic sulfur-containing compounds, some heat transfer oils, new refrigerant R134a and ozone environment.|
|FKM||The service temperature is – 15 ~ 200 ℃. It is suitable for fluid medium, such as concentrated sulfuric acid, caustic soda, heat transfer oil, alcohol fuel oil, acid fuel oil, high-temperature steam, chlorine water, phosphate, etc.|