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Water-free atmospheric vacuum distillation technology and device

An atmospheric and vacuum distillation and process technology, which is applied in vacuum distillation, distillation control/regulation of hydrocarbon oil, etc., can solve the problems of easy coking of oil products, reducing the operation stability of the device, and increasing the investment cost of energy consumption and equipment of the device.

Active Publication Date: 2018-02-16
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method adds three flash tanks, and the oil must be heated before entering each flash tank, which obviously increases the energy consumption of the device and the investment cost of the equipment, and the inlet temperature of the third-stage flash tank reaches 420°C, the oil product is easy to coke, which reduces the operation stability of the device

Method used

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  • Water-free atmospheric vacuum distillation technology and device
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  • Water-free atmospheric vacuum distillation technology and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] This embodiment provides a kind of anhydrous atmospheric and vacuum distillation device, its structure is as follows figure 2 shown. The anhydrous atmospheric and vacuum distillation device includes: initial distillation tower 1, atmospheric furnace 2, atmospheric tower 3, vacuum flash tower 9, vacuum furnace 5, vacuum tower 6, condenser 4, alkali washing tank 8 , reboiler;

[0079] Wherein, the primary distillation column 1 is provided with a crude oil inlet, a bottom outlet and a top outlet;

[0080] The atmospheric furnace 2 is provided with a fuel inlet, an oil inlet, a flue gas outlet and an oil outlet, and the bottom outlet of the primary distillation tower 1 is connected with the oil inlet of the atmospheric furnace 2;

[0081] The atmospheric tower 3 is provided with a bottom inlet, a bottom outlet, a first side outlet, a return injection inlet, a second side outlet, a third side outlet, and a top outlet; the oil outlet of the atmospheric furnace 2 communicat...

Embodiment 2

[0088] This embodiment provides a new process for anhydrous atmospheric and vacuum distillation, which is carried out by using the device in Example 1, and its flow process is as follows figure 2 shown. The process includes the following steps:

[0089] After the crude oil is desalted and dehydrated by electricity, it is heated to about 230°C and enters the primary distillation tower 1;

[0090]The oil at the bottom of the initial distillation tower 1 enters the atmospheric furnace 2, and after being heated to 360-370°C, it enters the atmospheric tower 3 for fractionation, and each side line is stripped through a reboiler to obtain naphtha, heavy diesel oil, light diesel oil, Kerosene, the dry gas produced by fractional distillation enters the alkali washing tank 8 after passing through the condenser 4 at the top of the tower, and the HCl, H therein 2 S gas is taken off, and the gasoline that condenser 4 obtains is exported as product;

[0091] The heavy oil in the bottom ...

Embodiment 3

[0094] The flow simulation is carried out with heavy Daria crude oil as the raw material of the atmospheric and vacuum unit, and the density at 20°C is 0.9078g / cm 3 . A 500,000-ton / year conventional atmospheric and vacuum plant and an anhydrous atmospheric and vacuum plant are designed respectively. See Table 1 for comparison of plant parameters.

[0095] Through PRO / II 9.2 software simulation, the effect comparison between conventional atmospheric and vacuum technology and anhydrous atmospheric and vacuum technology can be obtained, see Table 2 and Table 3.

[0096] It can be seen from the data in Table 2 and Table 3 that in the anhydrous atmospheric and vacuum process, there is no water vapor in the atmospheric column, so there will be no condensation of water vapor at the top of the atmospheric column, and the corrosive medium HCl cannot It dissolves in water to form a strong acid, which is removed as the oil and gas enter the alkali washing tank, eliminating the low-tempe...

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Abstract

The invention provides a water-free atmospheric vacuum distillation technology and device. The technology is characterized in that a normal-pressure tower and a vacuum tower adopt a four-time gasification and feeding manner; after crude oil is heated through a normal-pressure furnace, materials are fed from a tower kettle of the normal-pressure tower; water steam is not introduced into the tower kettle; each sideline product is heated by adopting a reboiler; alkali washing is carried out on tower top dry gas which is condensed and cooled at a tower top of the normal-pressure tower; a vacuum flashing tower is additionally arranged between the normal-pressure tower and a vacuum furnace; normal-pressure heavy oil from the tower kettle of the normal-pressure tower enters the vacuum flashing tower; the vacuum flashing tower is provided with a plurality of sidelines for drawing out products; the product drawn out from the first sideline is injected into the normal-pressure tower again; the heavy oil of the tower kettle enters the vacuum furnace and is further heated, and then enters the vacuum tower; pressure of the vacuum flashing tower is controlled between the pressure of the normal-pressure tower and the pressure of the vacuum tower. The invention further provides the water-free atmospheric vacuum distillation device. By adopting the device and the technology, provided by the invention, the low-temperature dew-point corrosion problem of the top of the normal-pressure tower can be solved, refinery wastewater is reduced and the diesel oil extraction rate of the normal-pressureheavy oil is improved; serious entrainment of the vacuum tower is alleviated and the decompression and deep drawing vacuum degree is reduced. The long-period, safe, stable and operation performance ofthe device is improved.

Description

technical field [0001] The invention relates to an anhydrous atmospheric and vacuum distillation process and device, belonging to the technical field of crude oil atmospheric and vacuum distillation. Background technique [0002] Crude oil distillation unit is the "leading" industry of petroleum refining, and it is the first process that most crude oil passes through after entering the refinery. The stability of its operating state not only affects the economic benefits of atmospheric and vacuum units, but also determines the follow-up The quality of the processing process. figure 1 It is a conventional flow diagram of a conventional atmospheric and vacuum distillation process, and the bottom of its atmospheric column 3 is provided with an atmospheric column stripping section 7. The processing volume of the atmospheric and vacuum unit is very large, and its energy consumption is directly related to the energy consumption level and economic benefits of the entire refinery. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G7/06C10G7/12
Inventor 曹睿刘艳升王雪刘拥军
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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