An online open-circuit water washing device and method for anti-salt formation in the overhead circulation system of a fractionation tower

Abstract

The invention provides a salt-deposition-preventing open-loop on-line washing apparatus and method for a top circulation system of a fractionating tower. The apparatus comprises a circulating pump, heat exchangers and a top circulation pipeline arranged out of the fractionating tower, wherein the upper circulation return port of the top circulation pipeline is connected with the upper part of the fractionating tower, and the lower circulation outlet of the top circulation pipeline is connected with the lower part of the fractionating tower. The apparatus is characterized in that the top circulation pipeline is provided with a first desalting water inlet, a second desalting water inlet and an oil-water separation tank, wherein the first desalting water inlet is arranged in a pipeline close to the upper circulation return port; the second desalting water inlet is arranged in a pipeline close to the lower circulation outlet; the oil-water separation tank is installed behind the heat exchangers and close to the upper circulation return port; and the lower part of the oil-water separation tank is connected with a deacidification system.

Description

technical field [0001] The invention relates to a fractionation tower top circulation system, in particular to an on-line open-circuit water washing device and method for preventing salt formation in the fractionation tower top circulation system. Background technique [0002] At present, as the properties of raw materials are deteriorating, the residue ratio is getting higher and higher, and the nitrides and chlorides in the raw materials are increasing. After a series of reactions, NH can be generated. 4 CI, (NH 4 ) SO 4 The salts are dissolved in the liquid water at the top of the fractionation tower to form a salt solution, which is condensed and vaporized between the upper trays of the fractionation tower, and the salts in the solution are precipitated, blocking the float valve, and increasing the pressure drop in the tower. The gas-liquid phase distribution is uneven, the speed limit in the fractionation tower is too large, the phenomenon of tower flushing occurs fre...

AI Technical Summary

Problems solved by technology

[0005] 2. During the washing process, the quality of oil products is affected to varying degrees;

[0006] 3. It is only suitable for short-term washing, and cannot be washed online for a long time;

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