Are there any effective solutions to the corrosion in the overhead circulation system of delayed coking fractionators?
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This post was last edited by Refiner on 2016-3-26 09:34. The chlorine ion content in the overhead circulation system of the delayed coking distillation column is high, resulting in severe corrosion, especially in the heat exchangers. Who has a proven solution to reduce the corrosion rate? If injection is used, what type of corrosion inhibitor is suitable?
There are specialized corrosion inhibitors for coking, and we produce them
Neutralizing corrosion inhibitor; titanium infiltration in the air-cooled inlet pipe ensures that iron ions in sulfur-containing wastewater remain below 3
At the moment, we have not detected any iron ions; instead, we have found that the chloride ion concentration is very high
When using pipes to inject corrosion inhibitors, the atomization and dispersion effects are poor, and the neutralization effect is inadequate; it is difficult to neutralize CL ions. Adding a corrosion inhibitor to the injection nozzle significantly improves the results. We specialize in top-of-tower injection and water injection nozzles. If you are interested, please send a message within the site.
What does it mean that iron ions are not detected, but the corrosion level is high? Is it because there is no water in this process? In the distillation tower top circulation system, is it the corrosion of the heat exchanger in the oil circulation section? If it is corrosion in this area, ordinary chemicals will not be sufficient to address the issue. Due to the presence of anhydrous substances, this type of corrosion is primarily under-scale corrosion, and conventional chemicals have limited effectiveness in preventing corrosion in such areas. Our company has specialized chemicals designed to deal with this kind of corrosion.
Based on your description, under the pressure and temperature conditions at the top of the circulation path, liquid water is likely not present; in my opinion, this is due to corrosion caused by ammonium salts in the heat exchanger. Such problems have become more frequent in recent years. Corrosion issues in this area are difficult to address using traditional corrosion inhibitors, as conventional chemicals offer limited protection against corrosion in this location. If you agree with my analysis, you can send me a private message to discuss further.