Normal pressure distillation method

A technology of atmospheric distillation and atmospheric tower, applied in hydrocarbon distillation, petroleum industry, etc., can solve the problems of high material consumption, high energy consumption, increased condensation cooling load at the top of the tower, and more sewage, so as to reduce the energy consumption of the device and reduce cooling Load and emission reduction effects

Inactive Publication Date: 2017-01-11
LUOYANG PETROCHEMICAL ENG CORP SINOPEC +1
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  • Abstract
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  • Application Information

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Problems solved by technology

[0013] The invention provides an atmospheric distillation method, which overcomes the high material consumption and energy consumption caused by blowing stripping steam into the bottom of the atmospheric tower and the bottom of the atmospheric side stripping tower in the prior art, increased condensation and cooling load at the top of the tower, and excessive sewage Shortcomings

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Embodiment 1

[0025] Embodiment 1 (prior art)

[0026] The processing capacity of the atmospheric distillation tower is 874330kg / h, the raw material is the initial bottom oil, and the obtained atmospheric residue is 560850kg / h, the stripping steam used in the stripping section of the atmospheric distillation tower product is 700kg / h, and the stripping atmospheric tower side line Product, the stripping steam used in the atmospheric residue stripping tower is 7000kg / h, and the total heat at the top of the tower is 681×10 4 kCal / h, the amount of sewage discharged from the top of the tower is 7700kg / h.

Embodiment 2

[0027] Embodiment 2 (the present invention)

[0028] The processing capacity of the atmospheric distillation tower is 874330kg / h, the raw material is primary bottom oil, and the obtained atmospheric residue is 560850kg / h. The stripping section of the atmospheric distillation tower uses non-condensable gas for stripping, and the non-condensable gas used is the gas, its main composition is C 1 、C 2 Gas, gas volume is 700kg / h, 7000kg / h non-condensable gas used for atmospheric residue stripping, accounting for 1.25% by weight of atmospheric residue, total heat at the top of the tower is 355×10 4 kCal / h. The non-condensable gas used is system dry gas (mainly composed of C 1 ~C 2 ), the present invention saves 0.3MPa steam 7700kg / h compared with the existing device, and the tower top reduces sewage discharge by 7700kg / h. All the dry gas at the top of the tower is recovered for reuse. Steam alone can save 7.7 million yuan of capital per year.

Embodiment 3

[0029] Embodiment 3 (the present invention)

[0030]The processing capacity of the atmospheric distillation tower is 874330kg / h, the raw material is primary bottom oil, and the obtained atmospheric residue is 560850kg / h. The product stripping section of the atmospheric distillation tower uses non-condensable gas for stripping. gas, its main composition is C 1 、C 2 Gas, the gas volume is 8200kg / h, the non-condensable gas used in the atmospheric residue stripping tower is 910kg / h, accounting for 1.62% by weight of the atmospheric residue, and the total heat at the top of the tower is 415×10 4 kCal / h. The noncondensable gas used is the constant top noncondensable gas (mainly composed of C 1 ~C 4 light hydrocarbon components), and the non-condensable gas at the top of the tower is recycled. Compared with the existing device, the present invention saves 0.3MPa steam by 7700kg / h, and reduces sewage discharge by 7700kg / h from the top of the tower. Steam alone can save 7.7 milli...

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Abstract

The invention discloses a normal pressure distillation method. The method comprises the following steps: raw oil is heated in a heating furnace, the heated raw oil enters a normal pressure tower provided with a plurality of lateral lines, products are extracted from the lateral lines, the products respectively enter a normal pressure stripping tower and are in contact with non-condensable gas to carry out stripping, a liquid phase product obtained after the stripping is discharged from the normal pressure stripping tower, and a gas phase obtained after the stripping is mixed with oil gas at the top of the normal pressure tower; and the non-condensable gas enters the bottom of the normal pressure tower and is used to carry out stripping on normal pressure bottom oil, the stripped normal pressure bottom oil is discharged from the normal pressure tower, and the obtained stripped gas phase is mixed with oil gas in the normal pressure tower. The method has the advantages of reduction of the use amount of steam, reduction of the discharge amount of sewage, reduction of the condensation cooling load of the tower top, and reduction of the energy consumptions of above devices.

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 an atmospheric distillation method for 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 conventional atmospheric and vacuum distillation process of crude oil mostly adopts the "three towers" process: the crude oil enters the initial distillation tower (or flash tower) after heat exchange, and then is heated in an atmospheric furnace and enters the atmospheric distillation tower, and the bottom oil of the atmospheric distillation tower is The vacuum furnace heating is sent to the vacuum distillation tower through the vacuum transfer line to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G7/00
Inventor 李和杰郭文豪畅广西陆晓青
Owner LUOYANG PETROCHEMICAL ENG CORP SINOPEC
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