Device for removing corrosive impurities and preventing salt deposition corrosion of fractionating tower

Abstract

The invention discloses a device for removing corrosive impurities and preventing salt deposition corrosion of a fractionating tower. The device and a flow control valve (7) of a top cycle oil return tower are arranged in parallel; the device comprises a static mixer (1), a mixing valve (2), a magnetic field coalescer (3), an electric field coalescer (4) and a filter separator (5) which are sequentially connected in series; an inlet of the static mixer (1) communicates with the inlet of the flow control valve (7) of the top cycle oil return tower and also communicates with a water inlet pipe; a top cycle oil outlet (54) of the filter separator (5) communicates with an outlet of the flow control valve (7) of the top cycle oil return tower; and the outlet of the flow control valve (7) of the top cycle oil return tower communicates with the fractionating tower (6). The device is adjustable in mixing strength, the corrosive impurities causing salt deposition corrosion of the fractionating tower can be effectively eliminated, magnetic field and electric field coalescence, filtration, separation and deep dehydration are adopted, the device is small in volume, high in desalination efficiency, small in floor area and low in investment, and salt deposition corrosion of the fractionating tower can be effectively inhibited.

Description

technical field [0001] The invention belongs to the technical field of petroleum processing, and in particular relates to a device for removing corrosive impurities and preventing salt formation corrosion of fractionation towers. Background technique [0002] Crude oil contains various heteroatoms such as sulfur, nitrogen, and chlorine, which will cause salt formation corrosion problems to varying degrees in the distillation unit and the fractionation tower of the subsequent secondary processing unit. [0003] Chlorides will be hydrolyzed to generate HCl under high temperature or hydrogenation water-containing conditions, and some nitrogen compounds will generate gas NH3, NH3 and HCl and oil gas mixed with a small amount of water vapor rise in the fractionation tower, the temperature gradually decreases, NH3 and HCl are NH4Cl will be generated, and when the temperature drops to the dew point of water vapor, water in liquid phase will appear, and NH4Cl will dissolve in conden...

AI Technical Summary

Problems solved by technology

[0005] Chinese patent CN103131472A discloses a process method for washing salt on-line in a fractionation tower of a delayed coking unit. The patent uses a method of directly adding washing water to the fractionation tower and dissolving NH4Cl in the washing water to wash off the salt in the tower. This method requires a large amount of The water enters the fractionation tower, and during the salt washing process, the fractionation tower is in an abnormal production state

However, the structure of the tower is complex and the depth of oil-water separation is limited.

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