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A crude oil vacuum distillation method for eliminating the bottleneck of the vacuum process

A distillation method and technology of a vacuum distillation tower, which are applied in the field of petroleum refining, can solve problems such as the inability to eliminate the processing bottlenecks of the vacuum furnace and the vacuum tower, the large operating load of the vacuum distillation tower, and the large load of the vacuum furnace, and achieve The effect of increasing the flash volume at the top of the vacuum flash evaporation tower, increasing the economic benefits of the device, and reducing the amount of modification

Inactive Publication Date: 2015-08-05
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method does not eliminate the processing bottlenecks of the vacuum furnace and vacuum tower
[0009] When decompressing and deep drawing crude oil, there are two main bottlenecks: one is that the load of the decompression furnace is too large, the newly designed device needs a high-load heating furnace, and the modified device is difficult to use the existing old heating furnace. Furnace, but need to add a heating furnace on the original basis or directly redesign; Second, the operating load of the vacuum distillation tower is too large, the newly designed device requires a larger tower diameter, and the modified device is difficult to use the existing old installations that need to be rebuilt

Method used

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  • A crude oil vacuum distillation method for eliminating the bottleneck of the vacuum process
  • A crude oil vacuum distillation method for eliminating the bottleneck of the vacuum process
  • A crude oil vacuum distillation method for eliminating the bottleneck of the vacuum process

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Embodiment 1

[0028] The method of the invention is used in the design of a new crude oil atmospheric and vacuum distillation unit.

[0029] The pretreatment and atmospheric distillation part are the same as the conventional atmospheric and vacuum device, and the process flow of the vacuum distillation part is as attached figure 1 shown. The processing capacity of the vacuum distillation unit is 240wt / a. The vacuum distillation process includes a vacuum flash tower, a vacuum furnace, and a vacuum distillation tower. The vacuum distillation tower is structured packing and is operated by a wet process. The steam blowing volume at the bottom of the tower is 1-3wt% of the tower feed, the operating pressure at the top of the tower is 1-20kPa, and the pressure drop of the whole tower is 1-10kPa.

[0030] Atmospheric residue oil from the bottom of the atmospheric distillation tower is preheated successively through the convection section of the atmospheric furnace and the convection section of th...

Embodiment 2

[0036] The scheme of the present invention is used for the capacity expansion transformation of a certain crude oil atmospheric and vacuum distillation unit. The flow process before the transformation is a conventional "two furnaces and three towers" flow process. After the transformation, the pretreatment and atmospheric pressure parts are the same as the conventional flow process, and the vacuum distillation part The process flow is attached figure 1 As shown, the main equipment includes a vacuum flash tower, a vacuum furnace, and a vacuum distillation tower. The vacuum distillation tower is a structured packing tower, the operating pressure at the top of the tower is 2.6kPa, and the pressure drop across the tower is 1.4kPa.

[0037] Atmospheric residue oil from the bottom of the atmospheric distillation tower is preheated through the convection section of the atmospheric furnace and the convection section of the vacuum furnace successively at a feed rate of 300t / h. After th...

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Abstract

The invention discloses a crude oil reduced pressure distillation method for eliminating a choke point in a pressure reduction process. The method comprises the following steps: firstly, performing heat exchange on atmospheric pressure residual oil through an atmospheric pressure furnace convection section and a reduced pressure furnace convection section, raising the temperature by 5-20 DEG C, then feeding the residual oil into a reduced pressure flash column, operating the reduced pressure flash column at 5-30kPa, at the same time, introducing reduced pressure flash column light lube oil as washing oil from the upper part of a reduced pressure distillation column, performing heat exchange on a gas on the top of the reduced pressure flash column, condensing, cooling and directly extracting the gas as a product, extracting the washing oil in the middle of the reduced pressure flash column, feeding the washing oil below a light lube oil extracting plate of the reduced pressure flash column, feeding the flash base oil of the reduced pressure flash column into a reduced pressure furnace, heating to be 370-410 DEG C, feeding into the reduced pressure distillation column through an oil transfer line, performing reduced pressure fractionation, and then extracting products of different fractions from a side line of the reduced pressure distillation column. The method improves the crude oil reduced pressure distillation process, eliminates the choke points of the reduced pressure furnace and the reduced pressure distillation column, reduces energy consumption, improves the treatment capacity and increases the economic benefits of a device.

Description

technical field [0001] The invention belongs to the field of petroleum refining, and in particular relates to a crude oil vacuum distillation method for eliminating the bottleneck of the vacuum process. Background technique [0002] The crude oil distillation process is the first process of petroleum refining. It divides crude oil into components with different distillation ranges by means of atmospheric pressure and vacuum distillation to meet the process requirements of products and raw materials of downstream devices. At present, the conventional crude oil distillation process mostly adopts the conventional "two furnaces and three towers" process of "initial distillation (flash) tower-atmospheric furnace-atmospheric tower-vacuum furnace-vacuum tower". The level of light oil yield and energy consumption directly affect the economic benefits of the unit. [0003] At present, with the continuous extraction of crude oil, the supply ratio of heavy crude oil and extra-heavy cr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G7/06
Inventor 辜乌根张冰剑陈清林
Owner SUN YAT SEN UNIV
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