Anti-corrosion measures for coking units
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Our company plans to increase the processing volume of Tahe crude oil this year. As we all know, Tahe oil is high in acidity, sulfur, and salt content, which causes severe corrosion to equipment. So how should we protect our coking units? I hope to get some advice from everyone!
The main anti-corrosion methods for coking units include: material upgrading, injection
First, it should be noted that the Tahe oil is likely to have high sulfur content, high density, high salt levels, and high levels of heavy metals, while its acidity is probably low. The key challenges in processing Tahe oil are sulfur corrosion in high-temperature areas and salt (acid) corrosion in low-temperature areas. Sulfur corrosion in high-temperature areas can be addressed primarily by upgrading the material; Cr5Mo and Cr9Mo are generally sufficient to solve this problem ； Corrosion in low-temperature areas is mainly due to the need to remove salts effectively in the atmospheric and vacuum distillation units; in the coking unit, the only option is to add corrosion inhibitors at the top of the fractionation tower.
Upgrading materials is a good approach; the material selection for refinery equipment using Middle Eastern oil requires higher standards compared to that used for oils from other production regions. You can look into the experience of foreign companies in this area
Coking is mainly about material upgrading; the key factor remains the high pressure in distillation
We address the current difficulties by upgrading the materials; since the installation was built not long ago, a large-scale upgrade is not possible； In the design of the top of our coking distillation tower, only a dump head has been provided; we have not yet added corrosion inhibitors. Which corrosion inhibitor is more effective?
In some environments, polyaniline can be chosen