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Salt-deposition-preventing open-loop on-line washing apparatus and method for top circulation system of fractionating tower

A technology of water washing device and fractionation tower, which is used in the treatment of hydrocarbon oil, the corrosion/fouling inhibition of treatment equipment, and the petroleum industry.

Active Publication Date: 2017-05-24
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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;

Method used

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  • Salt-deposition-preventing open-loop on-line washing apparatus and method for top circulation system of fractionating tower

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Embodiment Construction

[0042] The following implementations are used to illustrate the present invention, but not to limit the scope of the present invention.

[0043] The present invention provides an anti-salt on-line open-circuit water washing device for the top circulation system of a fractionation tower, such as figure 1 As shown, it includes a circulation pump 3, two heat exchangers 4, and a top circulation pipeline 2 arranged on the outside of the fractionation tower. The lower circulation outlet 22 communicates with the lower part of the fractionation tower 1, and the top circulation pipeline 2 is provided with a first desalinated water injection port 6, a second desalinated water injection port 7 and an oil-water separation tank, and the first desalinated water injection port 6 is arranged near the upper part On the pipeline of the circulation return port 21, the second brine injection port 7 is arranged on the pipeline close to the lower circulation outlet 22, the oil-water separation tank...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G75/00
Inventor 杨元彬王勇杨永生段伟峰李健任刚王建波刘明程文嘉陈亚金郝琳周定一
Owner PETROCHINA CO LTD
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