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Crude oil processing method

A crude oil processing and heavy oil technology, which is applied in the petroleum industry, processing hydrocarbon oil, etc., can solve the problems such as the limited effect of the flash vaporization of the flash tower, and achieve the effects of obvious and fast device income, short reconstruction period and improved extraction rate.

Active Publication Date: 2014-05-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 the flash vaporization of the flash tower is limited. Moreover, the gas phase at the top of the flash tower enters the vacuum distillation tower, which is equivalent to segmental feeding of the vacuum distillation tower after flash evaporation, without fundamentally changing the fractionation effect of the vacuum distillation tower

Method used

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Embodiment 1

[0032] The method of the invention is used in the design of a new crude oil atmospheric and vacuum device.

[0033] The pretreatment and atmospheric section are the same as conventional atmospheric and vacuum units. The processing capacity of the decompression unit is 1.2 million tons per year. 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% (mass) of the tower feed, the operating pressure at the top of the tower is 1.315kPa, and the pressure drop of the whole tower is 600Pa~750Pa.

[0034] The constant bottom oil is fed into the decompression section at 150 tons / hour, and enters the decompression flash tower together with the circulating residue at 370°C to 390°C, and the pressure at the top of the flash tower is controlled at 5kPa to 20kPa. After adiabatic flashing in the decompression flash tower, the flash top gas accounts for 16%-20% (mass) of the normal bottom oil....

Embodiment 2

[0041] The method of the present invention is used in the capacity expansion transformation of a certain crude oil atmospheric and vacuum device. The pretreatment and atmospheric pressure parts are the same as the conventional atmospheric and vacuum devices. The decompression part mainly includes a vacuum flash tower, a vacuum furnace, and a vacuum distillation tower. .

[0042] The vacuum distillation column is filled with structured packing, the operating pressure at the top of the column is 1.315kPa, and the pressure drop of the whole column is 600Pa~750Pa.

[0043] The constant bottom oil is fed into the decompression section at 150 tons / hour, and enters the decompression flash tower together with the circulating residue at 370°C to 390°C, and the pressure at the top of the flash tower is controlled at 5kPa to 20kPa. After adiabatic flashing in the decompression flash tower, the flash top gas accounts for 16%-20% (mass) of the normal bottom oil. The flash bottom oil is he...

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Abstract

The invention discloses a crude oil processing method, which comprises normal-pressure distillation and reduced-pressure distillation, wherein the heavy oil at the bottom of a normal-pressure distillation tower, namely normal bottom oil, is mixed with part of circular reduced-pressure residual oil at the bottom of a reduced-pressure distillation tower, the mixture enters a flash tower, and a top gas phase, namely flash top gas, of the flash tower undergoes heat exchange and is condensed into a liquid phase to be discharged out of the device as a product; and bottom oil, namely flash bottom oil, of the flash tower, is heated in a reduced-pressure furnace to 390 to 420 DEG C, the heated bottom oil is intruded into a flash section of the reduced-pressure distillation tower from a reduced-pressure oil transfer line for reduced-pressure distillation, proper distillate product is drawn from a side line of the reduced-pressure distillation tower, part of reduced-pressure residual oil drawn out from the bottom of the reduced-pressure distillation tower is circulated, and another part of the reduced-pressure residual oil is discharged of the device. Compared with the prior art, the method can effectively improve the drawing rate of a reduced-pressure distillation process and can reduce the load of the reduced-pressure furnace and the reduced-pressure distillation tower at the same time.

Description

technical field [0001] The invention belongs to the field of petroleum refining, and in particular relates to a crude oil processing method, more specifically to an atmospheric and vacuum distillation method for increasing the extraction rate. technical background [0002] Atmospheric and vacuum distillation of crude oil 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 equipment for raw materials. The conventional atmospheric and vacuum distillation process of crude oil mostly adopts the process of "two furnaces and three towers": crude oil enters the primary distillation tower (or flash tower) after pretreatment, and then enters the atmospheric distillation tower after being heated in the normal pressure furnace, and the bottom of the atmospheric distillation tower The oil is heated by the vacuum furnace and sent to the vacuum distil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G53/00
Inventor 张龙
Owner CHINA PETROLEUM & CHEM CORP
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