The plate heat exchanger is composed of a group of corrugated metal plates. The medium flows through the heat exchanger plates, and the energy transfer and conversion are realized by convection. Because the heat exchange medium is different, the material of the plate heat exchanger will be different, especially the medium containing chloride ions and caustic soda solution. What are the materials of plate heat exchanger plates?
1. According to the different media of the plate heat exchanger, we can divide the material into five categories.
(1) Austenitic stainless steel (AISI), including 304, 304L and 316, 316L here. (Note: AISI is an American standard, SUS is a Japanese standard).
(2) Hastelloy (Hastelloy) includes: C276, C22, D205, B2G.
(3) Titanium (Ti), titanium palladium alloy (Ti-Pd).
(4) Molybdenum 254SMO.
(5) Nickel (Ni) includes: Ni200 and Ni201.
2. After the plate material is determined, how do we determine the most suitable material under what working conditions?
(1) 304 material is suitable for organic and inorganic media. 316L is suitable for natural cooling water, cooling tower water, softened water and other media.
(2) Molybdenum SMO 254 high-grade stainless steel has excellent resistance to chloride and crevice corrosion, and is suitable for salt water, inorganic acid and dilute sulfuric acid.
(3) Titanium and titanium-palladium alloys are suitable for use in seawater, salt water, salt and chloride ions exceeding standard liquids. Nickel materials are mainly used in high temperature and high concentration caustic soda.
(4) Hastelloy alloy is used for concentrated sulfuric acid, hydrochloric acid and phosphoric acid.