Corrosion conditions in atmospheric pressure towers in the petrochemical industry
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The atmospheric pressure tower in the petrochemical industry is made of 16MnR material; the operating medium is crude bottom oil, with a temperature of 360 degrees and a pressure of 0.196 MPa. Due to the influence of naphthenic acids as well as hydrogen chloride and hydrogen sulfide, the metal on the inner wall of the tower suffers severe corrosion. In particular, areas such as the light oils at the top of the tower and the oil-gas mixture are relatively more affected. See the figure for details:
Due to the effect of corrosive substances such as naphthenic acids, hydrogen chloride, and hydrogen sulfide, the metal lining of the atmospheric distillation columns in the petrochemical industry suffers severe corrosion, especially in the areas where light oils and gas-oil mixtures are present at the top of the columns. .
Due to the presence of corrosive substances such as naphthenic acid, hydrogen chloride, and hydrogen sulfide in the environment, coupled with high-temperature operating conditions, corrosion of 16MnR material is prone to accelerate. The light oil at the top of the tower and the oil-gas sections suffer from relatively more severe corrosion due to greater exposure to these corrosive substances. .
Aren’t the tower tops made of composite materials, such as 16MnR+06Cr13?
Is there no good design that can avoid this?
Question: What value should be used for the corrosion margin during design? How many years has this container been in use?