Reduced-pressure flash tank and crude oil processing method

Abstract

The invention discloses a reduced-pressure flash tank and a crude oil processing method. The reduced-pressure flash tank comprises a tank body and an in-tank membrane, wherein the internal membrane comprises a feed inlet distributor arranged in a gas phase area on the upper part of the reduced-pressure flash tank and a rotating disc arranged above the liquid surface of a liquid phase area on the lower part of the reduced-pressure flash tank; and the rotating disc is fixed on a rotating shaft arranged at a radical axial center position of the tank body. In the crude oil processing method disclosed by the invention, 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 flash top gas, discharged from the top of the reduced-pressure flash tank is discharged out of the flash tank and condensed into a liquid phase to be led out of the device. When the reduced-pressure flash tank and the crude oil processing method are used, the drawing rate of a crude oil reduced-pressure distillation process is increased obviously, process energy consumption is reduced, and the economic benefit of the device is increased.

Description

technical field [0001] The invention belongs to the field of petroleum refining, and relates to a decompression flash tank and a crude oil processing method, in particular to a method and a device for improving the extraction rate in the crude oil processing process. Background technique [0002] Crude oil processing is the first process of petroleum refining, which is to divide crude oil into components of different distillation ranges by means of atmospheric and vacuum distillation, so as to meet the technological 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 then is heated in the normal pressure fur...

AI Technical Summary

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

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