Experimental results of the 2 types of sample tubes in the dry flue gas test of boiler systems
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These two photos are from tests conducted to evaluate the anti-corrosion coating on the surface of the heat exchange tubes in GGHs used in coal flue gas. 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 between 200 and 250 microns; the coating should have good thermal conductivity, close to that of the metal it is meant to protect against corrosion, and should offer high resistance to flue gas corrosion. Additionally, the coating’s surface energy should be low.
These two photos show the results of tests conducted to select anti-corrosion coatings for the surfaces of GGH heat exchange tubes in a coal flue gas environment. In the tests, the dry film coating thickness of the sample tube was 180–220 microns; it underwent 16 months of field testing at a temperature of 140–160 degrees. The coating on the upper part of the image is a ceramic coating that combines organic and inorganic materials, while the coating on the lower part is a polymer coating. The main requirements for these coatings are a thickness of 200–250 micrometers, good thermal conductivity, resistance to flue gas corrosion, and a low surface energy. .
Could you provide the composition of the flue gas inside the GGH heat exchange tubes? Could you explain in detail what kind of polymer coating it is, if it does not involve trade secrets?:lol