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A vacuum distillation method and device for improving extraction rate

A distillation method and technology of a vacuum distillation tower, applied in the field of vacuum distillation methods and devices, can solve problems such as the limited function of the flash tower, and achieve the effects of fast device revenue, reduced load, and obvious device revenue

Active Publication Date: 2015-11-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A vacuum distillation method and device for improving extraction rate

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Embodiment 1

[0036] 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.

[0037] 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 2kPa, and the pressure drop of the whole tower is 685kPa. The pressure of the decompression flash tank is 1.2kPa.

[0038] The constant bottom oil 1 is fed into the vacuum distillation device at 655 tons / hour, heated to 420°C by the vacuum furnace 2, and then enters the vacuum distillation column 3 from the transition section 4 of the va...

Embodiment 2

[0042] 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 vacuum distillation method for improving the extraction rate 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 2kPa, and the pressure drop of the whole tower is 685Pa. The pressure of the decompression flash tank is 1.2kPa.

[0043] The constant bottom oil 1 is fed into the vacuum distillation device at 655 tons / hour, heated to 420°C by the vacuum furnace 2, and then enters the vacuum distillation column ...

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Abstract

The invention discloses a crude oil vacuum distillation method and a device. According to the invention, a vacuum flash tank is added to a vacuum heavy oil outlet at a vacuum distillation tower bottom so as to make the vacuum heavy oil flowing out of the vacuum tower bottom undergo flashing in the vacuum flash tank under the condition of a vacuum degree higher than that of the vacuum tower bottom. A vacuum flash tank top gas enters a gas-liquid separation tank after heat exchange and cooling. The top of the gas-liquid separation tank is in connection with a vacuum-pumping system to maintain the vacuum degree of the flash tank. The vacuum distillate oil extracted from the bottom is taken as a product, and vacuum residual oil is extracted from the vacuum flash tank bottom. The vacuum distillation method disclosed in the invention improves the crude oil vacuum distillation process, and makes the vacuum heavy oil enter the vacuum flash tank with a high vacuum degree to undergo further flashing, thus acquiring relatively light distillate from the vacuum heavy oil by flashing completely and ensuring that the content of distillate lower than 500DEG C in vacuum residual oil is reduced to a minimum. Therefore, the distillate yield of vacuum distillation can be improved, and the economic benefits of the device can be increased.

Description

technical field [0001] The invention belongs to the field of petroleum refining, and in particular relates to a vacuum distillation method and a device for increasing the extraction rate in vacuum distillation 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 distillate in the vacuum residue are used as indicators to measure the operation of the unit. The conventional atmospheric and vacuum distillation process of crude oil mostly adop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G53/02
Inventor 关明华张龙李经伟齐慧敏王海波李欣
Owner CHINA PETROLEUM & CHEM CORP
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