Take a look at the corrosion damage caused by flue gas corrosion to moving equipment
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We know that metal corrosion is a topic that our scientific and technological workers can never finish talking about. Because corrosion has caused a lot of trouble and losses to our human development. The picture above is the hood of the industrial heating furnace of our company. Through it, the flue gas from the heating furnace is extracted and discharged into the atmosphere. The flue gas temperature is about 120 degrees. The casing of the flue gas is made of carbon steel, 15 mm thick. The impeller is 8 mm thick. This hood has no anti-corrosion, and has been corroded into the picture above after being used for nearly two years. It can only be scrapped, causing huge losses.
If it is anti-corrosion, what kind of anti-corrosion method is better?
According to the flue gas temperature after heat exchange of 100 to 150 degrees, it is better to use ceramic coatings or metal nano-polymer materials that are resistant to flue gas corrosion. If I use metal nano-coating to anti-corrosion the surface of the hood, the service life of the fan can be more than doubled. If you want to know more about it, you can look up the literature. I wrote an article "Application of titanium nanopolymer anti-corrosion coating in the anti-corrosion of the inner wall of the induced draft fan casing" in the 10th issue of "Material Protection" in 2006.
Thank you for your answer. Is this cost high and the coating requirements for manufacturing high? In addition, is it widely used in the market?
The cost of coating is not high. The coating is similar to the two-component epoxy construction, and there are no special requirements. In recent years, there have been many successful cases in the relatively harsh corrosive environment in my country's industrial sector. For example, the corrosion problem of heat exchange tubes in GGH was successfully solved in a low-temperature and wet flue gas environment.
This kind of equipment can be repaired and then coated with a corrosion-resistant coating, but it must be shut down for repair, which takes a long time, but the cost is much lower than replacing it with a new one.
We upgraded to 304 and it works!
There are already many use cases and the cost of coating is not high.
:Handshake Thank you for your answer. I will ask you for advice when I encounter specific situations in the future.
304 stainless steel is actually a metal containing mainly carbon, and there is still considerable corrosion in such an environment.