Presentation of the experimental results for 2 types of sample tubes in coal flue gas

Thread Content

This post was last edited by Wang Wei2 on 2024-5-29 at 21:33. These two photos are from experiments conducted to evaluate the anti-corrosion coating on the surface of the heat exchange tubes in GGHs used in coal flue gas treatment. The thickness of the dry film coating is 180–220 microns. The sample tubes were exposed to field conditions for 16 months, at temperatures ranging from 140 to 160 degrees, in coal flue gas within a heating furnace. The coating in the above image is a ceramic coating that combines organic and inorganic materials. The image below shows a polymer coating made of polymeric alloys. For the surface coating of heat exchange tubes in heat exchangers, it is required that the coating thickness be around 200–250 microns; it should have good thermal conductivity, similar to that of the metal that needs protection against corrosion, and should offer high resistance to corrosion caused by flue gases. Additionally, the coating’s surface energy should be low.