Process device for treatment of salt coagulation of fractionating column top circulation system

A technology of process equipment and fractionation tower, which is applied in the fields of processing hydrocarbon oil, processing equipment corrosion/fouling suppression, and petroleum industry, and can solve problems such as increased operating severity, impact on downstream devices, and greater impact on the quality of coked diesel products. The effect of preventing salt formation

Inactive Publication Date: 2014-07-30
SHANDONG JINCHENG HEAVY OIL RES INST OFCHEM TECH
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Problems solved by technology

Both of the above two treatment methods can remove the top-cycle ammonium salt, but the main problems are: (1) When the top-cycle salt is treated by online water washing, the product quality of coked diesel oil is greatly affected, and the coked diesel oil carries water , affecting the device and downstream devices; (2) When steam purging is used, the operating severity increases, and the top cycle reflux system needs to be shut down, etc.

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  • Process device for treatment of salt coagulation of fractionating column top circulation system

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Embodiment Construction

[0025] Combine below figure 1 The present invention will be described in detail with specific embodiments. This patent example selects Shandong Jincheng Petrochemical Group Co., Ltd. 40×10 4 T / a delayed coker.

[0026] Diesel oil is drawn out from fractionation tower oil collecting tank 4 by diesel pump 8, goes to diesel air cooler 12 and cools to After 55°C, go to the diesel oil water cooler 13 to cool down to 40°C, and after the flow is controlled by the regulating valve 19 of the diesel output unit, it is mixed with gasoline and sent to the hydrogenation unit.

[0027] The oil gas at the top of the fractionation tower is cooled to 40°C by the air cooler 14 and the water cooler 15 at the top of the fractionation tower, and then flows into the oil-gas separation tank 16 at the top of the fractionation tower. device.

[0028] The circulating oil at the top of the fractionating tower is extracted from the second tray 2 in the fractionating tower 3 by the circulating reflux ...

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Abstract

The invention relates to a process for delaying coking and in particular relates to a process device for treatment of salt coagulation of a fractionating column top circulation system. The technical key points are as follows: a top cycle oil series diesel pipeline is further arranged on a connecting pipeline between a fractionating column top reflux air cooler and a first column tray to a diesel and gasoline hydrogenation device and a top cycle oil series diesel regulating valve and a top cycle oil series diesel flowmeter are connected on the top cycle oil series diesel pipeline in series. The process device provided by the invention can break the balance of circulation of top circulation in the system, reduce accumulation of salt coagulation and achieve the purpose of preventing column top salt coagulation through the newly increased top cycle oil series diesel regulating valve and the newly increased top cycle oil series diesel flowmeter under the situation of not changing the reflux quantity of top cycle oil and not affecting the fractionating column top temperature.

Description

technical field [0001] The invention relates to a delayed coking process, in particular to a process device for treating salt deposits in the top circulation system of a fractionation tower. Background technique [0002] Crude oil contains a large amount of nitrogen compounds, sulfides and chlorides. Although the crude oil has undergone atmospheric and vacuum electric desalting, the crude oil still contains some chloride ions and nitrogen compounds. After atmospheric and vacuum fractionation, most of the nitrogen compounds are enriched in It is difficult to remove high boiling point fractions and residual oils. [0003] The vacuum residue entering the coking process is heated by the heating furnace, and the coke formation reaction in the coke tower generates NH 3 、H 2 S and HC1 etc. NH 3 with HC1, H 2 S reacts to NH 4 C1, (NH 4 ) 2 S and other inorganic salts. Thanks to NH 4 C1 is easily soluble in water and easy to precipitate at low temperature, NH 4 The existen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G75/00
Inventor 林维华郑保丁王超
Owner SHANDONG JINCHENG HEAVY OIL RES INST OFCHEM TECH
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