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Sectional feeding vacuum distillation method and apparatus for crude oil

A technology of segmented feeding and distillation method, which is applied in the field of petroleum refining, can solve the problems of low vacuum degree of flash tower and limited flashing effect of flash tower, so as to improve product quality and avoid gas phase mist Entrainment, reduce the effect of investment

Inactive Publication Date: 2013-02-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the bottom oil of the atmospheric distillation tower enters the flash tower. Since the temperature of the bottom oil of the atmospheric distillation tower is relatively low, and the vacuum degree of the flash tower in front of the furnace is relatively low, the effect of flash vaporization in the flash tower is limited.

Method used

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  • Sectional feeding vacuum distillation method and apparatus for crude oil

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Embodiment 1

[0026] The method of the present invention is used in the design of a new crude oil atmospheric and vacuum device, and the process flow of the decompression part and the accompanying figure 1 Same as shown.

[0027] The processing capacity of the decompression device is 550 tons / hour, and the decompression process includes a decompression furnace, a flash tower, and a decompression tower. The decompression tower is a structured packing tower, which is operated by a wet process. The steam blowing volume at the bottom of the tower is 1% of the mass of the tower feed, the operating pressure at the top of the tower is 1.315 kPa, and the pressure drop of the whole tower is 600 Pa to 750 Pa.

[0028]The normal bottom oil 1 is fed into the vacuum distillation device at 550 tons / hour, heated to 390°C-420°C by the vacuum furnace 2, and then enters the vacuum flash tower 4. The top flash gas of the flash tower directly enters the middle and upper part of the vacuum tower, and the flash...

Embodiment 2

[0030] The method of the present invention is used for the expansion and transformation of a certain crude oil atmospheric and vacuum device. The normal pressure part is the same as the conventional atmospheric and vacuum device, and the decompression part figure 1 The schematic flow diagram of the vacuum distillation method and equipment for crude oil with staged feeding shown mainly includes a vacuum furnace, a flash tower, and a vacuum tower. The vacuum tower is a structured packing tower, the operating pressure at the top of the tower is 1.315 kPa, and the pressure drop of the whole tower is 600 Pa to 750 Pa.

[0031] The normal bottom oil 1 enters the vacuum distillation device, is heated to 390° C. to 420° C. by the vacuum furnace 2, and then enters the vacuum flash tower 4 . The top flash gas of the flash tower directly enters the middle and upper part of the vacuum tower, and the flash oil at the bottom of the flash tower enters the flash distillation section 3 of the ...

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Abstract

The invention discloses a sectional feeding vacuum distillation method and an apparatus for crude oil. The method comprises the steps of omitting relatively long transfer line from the outlet of a vacuum furnace to the vacuum tower; arranging a flashing tower between the vacuum tower and a vacuum distillation tower; passing superheated steam through the bottom of the flashing tower; introducing the raw materials of vacuum distillation to the flashing tower through the vacuum furnace after being heated; educing relative light components (hereinafter referred to flashing top gas) in the flashing tower from the tower top after steam stripping evaporation; entering below a packing layer of some fractioning section of the vacuum distillation tower; and introducing the liquid phase (hereinafter referred to flashing bottom oil) educed from the bottom of the flashing tower to the feeding section of the vacuum distillation tower to perform vacuum distillation. The sectional feeding vacuum distillation method and the apparatus for the crude oil can obviously increase pull-out rate of the vacuum distillation process and improve the quality of the vacuum distillates.

Description

technical field [0001] The invention belongs to the field of petroleum refining, in particular to a crude oil vacuum distillation method with subsection feeding. technical background [0002] Atmospheric and vacuum distillation process of crude oil in refinery is the first process of petroleum refining. It divides crude oil into components with different distillation ranges by distillation to meet the process requirements of products and downstream devices for raw materials. The conventional atmospheric and vacuum distillation process of crude oil mostly adopts the process of "two furnaces and three towers": the crude oil is pretreated and enters the primary distillation tower (or flash tower), and then is heated in the normal pressure furnace and enters the atmospheric tower, and the bottom oil of the atmospheric tower is passed through The heating of the vacuum furnace is sent to the vacuum tower by the vacuum transfer line to complete the atmospheric distillation and vacu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G53/02
Inventor 张龙王岩王明星
Owner CHINA PETROLEUM & CHEM CORP
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