Online process anticorrosion method for fractionation system of hydrogenation device

Abstract

The invention relates to an online process anticorrosion method for a fractionation system of a hydrogenation device. An efficient oil-water separation module, a pre-mixing washer, a variable-diameterradial salt leaching core tube and a hydrophilic and hydrophobic fiber combined demulsification-corrugation enhanced rapid oil-water separator are arranged to complete the efficient removal of high-salt and high-ammonia-nitrogen water entrained in an oil phase in a cold high-pressure separator and a cold low-pressure separator, and then mixed low-grade oil undergoes washing extraction, oil-waterseparation and other processes to make the content of inorganic chloride ions in the mixed low-grade oil entering the fractionation system less than 1 mg / L. The method can effectively reduce the content of corrosive inorganic salts in the low-grade oil, avoid the subsequent problems of reduced production efficiency and shortened running period caused by the slat deposition and corrosion of the fractionation system and eliminate the problem of corrosion destroys of too high content of the corrosive ions to subsequent devices.

Description

technical field [0001] The invention relates to a hydrogenation unit, and relates to an online process anticorrosion method for a fractionation system of the hydrogenation unit. Background technique [0002] Due to the existence of various impurities such as sulfur and chlorine in the feed oil in the hydrogenation unit, after entering the reaction part, some organic chloride ions become inorganic chloride ions and precipitate, resulting in the content of salt and ammonia nitrogen in the distillate oil in the subsequent fractionation system If it is too high, as the running time increases, the salt content will continue to increase, and more salts will crystallize to block the trays, air cooling, circulation pumps and pipelines in the fractionation system, making it more likely to flush the tower, and the crystal particles will increase The equipment is scoured and worn, endangering safe production and increasing the difficulty of operation. At the same time, corrosion occur...

AI Technical Summary

Problems solved by technology

[0002] Due to the existence of various impurities such as sulfur and chlorine in the feed oil in the hydrogenation unit, after entering the reaction part, some organic chloride ions become inorganic chloride ions and precipitate, resulting in the content of salt and ammonia nitrogen in the distillate oil in the subsequent fractionation system If it is too high, as the running time increases, the salt content will continue to increase, and more salts will crystallize to block the trays, air cooling, circulation pumps and pipelines in the fractionation system, making it more likely to flush the tower, and the crystal particles will increase The equipment is eroded and worn, endangering safe production and increasing the difficulty of operation

At the same time, corrosion occurs in the air cooling, booster pumps, pipelines, etc. in the system, and the possibility of corresponding leakage and emergency shutdown increases, the replacement cycle of equipment materials is shortened, and daily maintenance is more difficult, which threatens the safe production of the device

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