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Crude oil distillation method

A crude oil distillation and atmospheric distillation technology, used in hydrocarbon distillation, vacuum distillation, petroleum industry and other directions, can solve problems such as unfavorable vacuum distillation column operation, safety design and installation difficulty, and achieve the benefits of capacity expansion and transformation, saving The effect of equipment investment and reduction of equipment energy consumption

Active Publication Date: 2013-11-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the oil transfer line must be more than 15m (to ensure that the gas-liquid phase has a certain stratification time, which is conducive to improving product quality and the extraction rate of the vacuum distillation tower), the large-diameter and long-distance oil-transfer line occupies a large part of the vacuum distillation unit At the same time, factors such as heat loss and pressure drop increase are not conducive to the operation of the vacuum distillation tower, and the resulting thermal stress and thermal displacement cause certain difficulties in design and installation in terms of safety.

Method used

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Embodiment 1

[0043] The method of the invention is used in the design of a new crude oil atmospheric and vacuum unit.

[0044] The pretreatment and atmospheric part are the same as the conventional atmospheric and vacuum equipment. The decompression part of the device has a processing capacity of 1.2 million tons per year. The decompression process includes a first-level flash tower, a vacuum furnace, a second-level flash tower, and a vacuum distillation tower. The vacuum distillation tower is a structured packing tower, which is operated by a wet process, the bottom steam blowing volume is 1% (mass) of the tower feed, the top operating pressure is 1.315kPa, and the total pressure drop is 600Pa-750Pa.

[0045] The constant bottom oil is fed into the decompression section at 150 tons / hour, and enters the first-stage flash tower together with the circulating vacuum residue at 370°C to 390°C, and the top pressure of the first-stage flash tower is controlled at 5kPa-20kPa. After adiabatic flashing...

Embodiment 2

[0053] The method of the present invention is used in the expansion and transformation of a crude oil atmospheric and vacuum unit. The pretreatment and atmospheric part are the same as the conventional atmospheric and vacuum unit, and the vacuum part mainly includes a primary flash tower, a vacuum furnace, and a secondary flash distillation Tower, vacuum distillation tower. The vacuum distillation tower is a structured packing tower, the top operating pressure is 1.315kPa, and the pressure drop across the tower is 600Pa~750Pa.

[0054] The 350℃ constant bottom oil is fed into the decompression section at 150 tons / hour, and enters the first-stage flash tower together with the circulating vacuum residue of 380℃~390℃, and the top pressure of the first-stage flash tower is controlled at 5kPa~20kPa . After adiabatic flashing in the first-stage flash tower, the first flash gas accounts for 16%-20% (mass) of the constant bottom oil. The first flash oil is heated to 390°C~420°C by the ...

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Abstract

The invention discloses a crude oil distillation method. A primary flash distillation tower is arranged between a normal pressure distillation tower and a pressure reduction furnace, a pressure reduction oil line from an outlet of the pressure reduction furnace to a pressure reduction distillation tower is omitted, a secondary flash distillation tower is arranged between the pressure reduction furnace and the pressure reduction distillation tower, tower bottom heavy oil of the normal pressure distillation tower, i.e. normal bottom oil enters the primary flash distillation tower after being mixed with cyclic pressure reduction slag oil, the tower top gas phase of the primary flash distillation tower is converted into a liquid phase to be used as products through heat exchange and condensing, bottom oil of the primary flash distillation tower enters the secondary flash distillation tower through being heated by the pressure reduction furnace, the tower top gas phase of the secondary flash distillation tower is converted into a liquid phase to be used as products through heat exchange and condensing, and bottom oil of the secondary flash distillation tower is introduced into a flash distillation section of the pressure reduction distillation tower for pressure reduction distillation. Compared with the prior art, the method has the advantages that on one hand, the yield of the pressure reduction slag oil is reduced, and the economic benefits of devices are improved; and on the other hand, the load of the pressure reduction furnace and the pressure reduction distillation tower is reduced, the device investment is saved, and the energy consumption of the devices is reduced.

Description

Technical field [0001] The invention belongs to the field of petroleum refining, and specifically relates to a crude oil distillation method, more specifically a crude oil distillation method for improving extraction rate. technical background [0002] Crude oil atmospheric and vacuum distillation process is the first process of petroleum refining. It is divided into components of different distillation ranges by distillation to meet the process requirements of products and downstream equipment for raw materials. The conventional crude oil atmospheric and vacuum distillation process mostly adopts the process of "two furnaces and three towers": the crude oil enters the initial distillation tower (or flash distillation tower) after pretreatment, and then is heated into the atmospheric distillation tower by the atmospheric furnace, and the atmospheric distillation tower bottom The oil is heated by the vacuum furnace and sent to the vacuum distillation tower from the vacuum transfer ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G7/00C10G7/06
Inventor 张龙
Owner CHINA PETROLEUM & CHEM CORP
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