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Deep reduced pressure flash tank and reduced pressure deep distillation method

A technology of flash tank and vacuum distillation tower, which is applied in the field of petroleum refining, can solve problems such as the limited function of the flash tower, and achieve the effect of increasing the economic benefit of the device, reducing the energy consumption of the device, and being advanced and reasonable

Active Publication Date: 2015-04-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the bottom oil of the atmospheric tower enters the flash tower, since the temperature of the bottom oil of the atmospheric 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 of the flash tower is limited, and the flash The gas phase at the top of the steamer enters the vacuum tower, which is equivalent to segmental feeding of the vacuum tower after flash evaporation, without fundamentally changing the fractionation effect of the vacuum tower

Method used

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  • Deep reduced pressure flash tank and reduced pressure deep distillation method

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Embodiment 1

[0048] The method of the present invention is used in the design of a new crude oil atmospheric and vacuum distillation unit, and the process flow of the decompression part and the accompanying figure 1 Same as shown.

[0049] The processing capacity of the decompression device is 5.5 million tons per year, and the decompression process includes a vacuum furnace, a vacuum distillation tower, and a vacuum flash tank. The vacuum distillation 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 feed to the tower, the operating pressure at the top of the tower is 2 kPa, and the pressure drop of the whole tower is 685 kPa. The pressure of the decompression flash tank is 1.2 kPa. Described decompression flash tank is a kind of decompression flash tank (as attached figure 2 shown). The tank length L is three times the tank diameter D1, and the inner diameter D2 of the gas accumulator is 50% of th...

Embodiment 2

[0054] 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 diagram of the process flow of the crude oil processing method shown mainly includes a vacuum furnace, a vacuum tower distillation, and a vacuum flash tank. The vacuum distillation 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 tower feed, the operating pressure at the top of the tower is 2 kPa, and the pressure drop of the whole tower is 685Pa. The pressure of the decompression flash tank is 1.2 kPa. The deep decompression flash tank is a decompression flash tank with a spiral equal-diameter rotating disk thin film evaporator (as attached figure 2 shown). The tank length L is three times the tank diameter D1,...

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Abstract

The invention discloses a deep reduced pressure flash tank and a reduced pressure deep distillation method. The reduced pressure flash tank comprises a tank body and internal members of the tank. The internal members comprises a feeding inlet distributor arranged in a gas phase zone at the upper part of the reduced flash tank and a rotary disk arranged above a liquid surface of the lower part liquid phase zone, wherein the rotary disk is fixed on a rotary shaft arranged in an axis direction of the tank body. In the reduced pressure deep distillation method, the reduced pressure flash tank is arranged behind the reduced pressure tower; the atmospheric pressure bottom oil is heated by a reduced pressure furnace and introduced to the reduced pressure tower through a reduced pressure transfer line; reduced pressure light fraction oil is pumped out from the lateral line of the reduced pressure tower; reduced pressure heavy oil is pumped out from the bottom of the tower and introduced to the reduced pressure flash tank; the obtained gas phase is introduced to a gas-liquid separation tank; the reduced pressure light fraction oil is discharged from the bottom of the gas-liquid separation tank; and the flashed reduced pressure residual oil is discharged from the bottom of the reduced pressure flash tank. The deep reduced pressure flash tank and the reduced pressure deep distillation method can obviously increase distillation yield during a distillation process of crude oil, reduce energy consumption during the process and increase economic benefits of the apparatus.

Description

technical field [0001] The invention belongs to the field of petroleum refining, and relates to a deep vacuum flash tank, a vacuum deep drawing method and a device, in particular to a crude oil processing method and a device for increasing the distillate yield in the vacuum distillation process of crude oil. 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 level of its light oil yield and the size of energy consumption directly affect the economic benefits of petroleum refining. Usually, the total extraction rate of light distillate oil from the unit, the energy consumption of the unit and the content of <500°C fraction or <538°C fraction in the vacuum residue are used as indicators to measure the ope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G7/06
Inventor 张龙李经伟齐慧敏王海波王岩李欣
Owner CHINA PETROLEUM & CHEM CORP
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