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Reduced-pressure flash tank and reduced-pressure distillation method

A vacuum distillation tower and flash tank technology, applied in vacuum distillation, vacuum distillation, distillation in a rotating container, etc., can solve problems such as the limited function of the flash tower, and is beneficial to capacity expansion, improvement of evaporation rate, The effect of improving the extraction rate

Active Publication Date: 2014-03-05
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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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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Embodiment Construction

[0034] combined with figure 1 , a kind of technical process of the method of the present invention is: after pretreatment crude oil 1 is heated up to 360 ℃~370 ℃ through atmospheric heating furnace 17, enters atmospheric distillation tower 5, and distills off constant top product 11 and each side stream atmospheric distillate oil 16 . Atmospheric residue 15 and flash top gas heat exchange and heat up, enter the decompression furnace 2 to heat to 380 ° C ~ 400 ° C, and enter the decompression flash tank gas-liquid separator 18 into the decompression flash tank for preliminary gas-liquid separation . The gas phase rises and is discharged from the flash top gas outlet 22 on the top of the tank. After the constant bottom oil / flash top gas 6 heat exchange-flash top gas condenser 14 is condensed, the gas-liquid separation is carried out, and the separated liquid phase is used as the flash top product 8 , the gas phase is connected to the vacuum system to control the residual press...

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Abstract

The invention discloses a reduced-pressure flash tank and a crude oil reduced-pressure distillation method. The reduced-pressure flash tank comprises a tank body, a supergravity rotating evaporator is arranged in a gas phase area in the upper part of the reduced-pressure flash tank, and the rotating evaporator is fixed on a rotating shaft arranged at a longitudinal axial center position of the tank body. In the crude oil reduced-pressure distillation method, the reduced-pressure flash tank is arranged between a reduced-pressure furnace and a reduced-pressure distillation tower, a reduced-pressure distillation raw material is heated in the reduced-pressure furnace and then enters the reduced-pressure flash tank for evaporation and gas-liquid separation, a liquid phase, namely bottom oil, discharged from the bottom of the reduced-pressure flash tank is introduced into the reduced-pressure distillation tower, and a gas phase, namely a top gas, discharged from the top of the reduced-pressure flash tank is discharged from the flash tank and is condensed into a liquid phase to be led out of the device. When the reduced-pressure flash tank and the crude oil reduced-pressure distillation method are used, the drawing rate of a crude oil reduced-pressure distillation process can be increased obviously, and the energy consumption of the device can be lowered.

Description

technical field [0001] The invention belongs to the field of petroleum refining, and relates to a vacuum flash tank and a vacuum distillation method, in particular to a vacuum distillation method and device which are beneficial to improving the extraction rate of crude oil vacuum distillation and reducing energy consumption . Background technique [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 level of its light oil yield and the size of energy consumption directly affect the economic benefits of petroleum refining. 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 the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D3/10B01D3/08C10G53/00C10G7/06
Inventor 张龙王岩齐慧敏
Owner CHINA PETROLEUM & CHEM CORP
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