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A New Prediction Tool For Sulfidation Corrosion In Crude Units

Picture for A New Prediction Tool For Sulfidation Corrosion In Crude Units
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In recent years, unexpected failure caused by sulfidation corrosion have increased presumably because many refineries diversify the crude oils to process them. Crude oils contain corrosive species such as sulfides, nitrides, chlorides, organic acids and chemical additives. In these corrosive species, sulfides in the fluids cause sulfidation corrosion operating at temperature above approximately 260 °C1.

Product Number: 51321-16762-SG
Author: Kazuhiro Toba, Shinji Miyamoto, Satoshi Tokuoka
Publication Date: 2021
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$20.00
$20.00

A new prediction tool was developed for sulfidation corrosion applied in crude units. The corrosion rate of sulfidation is predicted using the total sulfur concentration and temperature by the modified McConomy curves. However, the corrosion behavior in crudes even with the same total sulfur concentration is sometimes different. This is because the corrosion rate might be affected by reactive sulfur compounds in particular crudes. This study was conducted to enhance prediction technique using a new factor replaced with the total sulfur concentration. For the target crude oils, diesel, heavy gas oil and residue fractions were distilled using a 15-stage distillation apparatus. The corrosion rates by immersion tests with each fraction were not correlated with the total sulfur and mercaptan concentrations. Then, “S factor” is proposed as a new concept to evaluate the sulfidation corrosion rate. The coefficients are determined for the total sulfur and mercaptan concentrations in distillates, and the S factor is defined as an addition of each term. As a result, the corrosion rates have a good correlation with the S factor. As well as the total sulfur and mercaptan concentrations, the S factor is installed as a prediction factor of the sulfidation corrosion of crudes.

A new prediction tool was developed for sulfidation corrosion applied in crude units. The corrosion rate of sulfidation is predicted using the total sulfur concentration and temperature by the modified McConomy curves. However, the corrosion behavior in crudes even with the same total sulfur concentration is sometimes different. This is because the corrosion rate might be affected by reactive sulfur compounds in particular crudes. This study was conducted to enhance prediction technique using a new factor replaced with the total sulfur concentration. For the target crude oils, diesel, heavy gas oil and residue fractions were distilled using a 15-stage distillation apparatus. The corrosion rates by immersion tests with each fraction were not correlated with the total sulfur and mercaptan concentrations. Then, “S factor” is proposed as a new concept to evaluate the sulfidation corrosion rate. The coefficients are determined for the total sulfur and mercaptan concentrations in distillates, and the S factor is defined as an addition of each term. As a result, the corrosion rates have a good correlation with the S factor. As well as the total sulfur and mercaptan concentrations, the S factor is installed as a prediction factor of the sulfidation corrosion of crudes.

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High temperature sulfidation is one of the oldest damage mechanisms in the refining process such as crude distillation unit, vacuum distillation unit and hydroprocessing unit. Since corrosion proceeds to general corrosion and occurs in a high temperature environment, it is a type of corrosion that can lead to a large fire explosion when a leak occurs.
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