Anti-corrosion solution for the catalytic top-cycle oil heat exchanger

I wonder how the corrosion is What’s the temperature? What is a medium!

The medium in the top circulation position is top circulation oil, with a temperature ranging from 100 to 140 degrees Celsius.

Anti-corrosion treatment can be carried out using British DEP205 or American Belzona 1591.

I am familiar with Belzona’s products, but they seem not suitable for coating entire heat exchangers. As for the British DEP205, I have no experience with it; is there any information available that could help me learn more about it?

A corrosion-resistant, acid- and alkali-resistant glaze can be used.

High-sulfur area; the medium is slightly heavier than gasoline, or it can also be considered gasoline, with a temperature of around 110 to 150 degrees Celsius.

Is your device also a heat exchanger? There are no issues with gasoline, sulfur, or temperature. It depends on what specific equipment it is!

Under the reaction conditions of high-temperature catalytic cracking, chlorides and nitrides react in the riser reactor to produce HCl and NH3. In the distillation tower, NH3, HCl, along with oil and gas containing a small amount of steam, gradually cool as they rise. When the temperature reaches the dew point of water vapor under these conditions, condensate water is formed. At this point, NH3 and HCl dissolve in the condensate water to form an NH4Cl solution. The boiling point of this NH4Cl solution is much higher than that of water, and it becomes increasingly concentrated as it moves downstream with the reflux stream in the tower. When the salt concentration exceeds its saturated concentration at this temperature, salt crystals precipitate out； When NH3 and HCl cannot be in balance, an HCl solution is formed at the point where liquid is drawn from the top loop, corroding the equipment. Suggestions: 1. Inject a corrosion inhibitor into the top circulation system; this inhibitor can effectively adsorb onto the metal surface to form a protective film, thereby providing some level of protection. 2. Use salt-forming control agents by adding certain amounts of NH4CL and NH4HS scale inhibitors; these inhibitors preferentially form salts with chlorides and sulfides. The crystallization temperature of such salts is above 200°C, and they are highly soluble in water, which enables effective suppression of scaling caused by NH4CL and NH4HS, thereby helping to reduce corrosion. 3. Add a dehydration process to the top circulation system by installing dehydration tanks to remove the condensate water containing large amounts of ammonium salts from the system.

We have also used corrosion inhibitors injected into the top circulation system, but we’re not sure what the principle behind it is