Corrosion mechanism and prevention measures of the lean liquid regeneration system
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Due to the long-term operation of the coking regeneration system, frequent corrosion-related leaks occur in the extraction pipelines of the regeneration tower. In response to this situation, the workshop has carried out repairs to some of these pipelines and replaced those that were severely corroded. What are the corrosion mechanisms, and how can prevention be achieved in the later stages?
It is not specified which part of the regeneration tower the extraction line corresponds to. At present, the most problems occur with the lean amine liquid at the bottom; there are many cases of corrosion related to this semi-lean amine liquid. This area is the hottest part of the entire amine liquid system, and issues such as amine corrosion, amine cracking, damage caused by wet hydrogen sulfide, as well as problems related to process control and the level of thermal ammonium salts, arise here； Equipment, austenitic stainless steel. For the top part, consider dew point corrosion, processing methods, and corrosion inhibitors ； Equipment, also made of stainless steel
The regeneration liquid contains chlorine and fluorine-based substances; considering only the material aspects may not be sufficient to solve the problem. It is recommended to apply an anti-corrosion coating, such as our 1033 or 711 coatings