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 Equipment investment, the effect of eliminating the amount of processing

Active Publication Date: 2012-05-09
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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Effect test

Embodiment 1

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

[0044] The pretreatment and atmospheric parts are the same as the conventional atmospheric and vacuum devices. The processing capacity of the decompression part is 1.2 million tons / year, and the decompression process includes a primary flash column, a vacuum furnace, a secondary flash column, and a vacuum distillation column. The vacuum distillation tower is a structured packing tower, which adopts wet process operation. The steam blowing amount at the bottom of the tower is 1% (mass) of the tower feed, the operating pressure at the top of the tower is 1.315kPa, and the pressure drop in the whole tower is 600Pa~750Pa.

[0045] The normal bottom oil is fed into the vacuum section at a rate of 150 tons / hour, and enters the primary flash tower together with the circulating vacuum residue at 370°C to 390°C, and the pressure at the top of the primary flash tower is controlled...

Embodiment 2

[0053] The method of the invention is used for the capacity expansion and reconstruction of a crude oil atmospheric and vacuum unit. The pretreatment and atmospheric pressure parts are the same as those of the conventional atmospheric and vacuum unit. tower, vacuum distillation tower. The vacuum distillation column is a structured packing column, the operating pressure at the top of the column is 1.315kPa, and the pressure drop of the whole column is 600Pa~750Pa.

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

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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 the extraction rate. technical background [0002] Atmospheric and vacuum distillation of crude oil is the first process in petroleum refining. It divides crude oil into components with different distillation ranges by distillation to meet the technological requirements of products and downstream devices for raw materials. The conventional crude oil atmospheric and vacuum distillation process mostly adopts the process of "two furnaces and three towers": crude oil enters the initial distillation tower (or flash distillation tower) after pretreatment, and then is often heated in a pressure furnace and enters the atmospheric distillation tower, and the bottom of the atmospheric distillation tower The oil is heated by the vacuum furnace and sent to the vacuum distillation towe...

Claims

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Application Information

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