Deep reduced pressure flash tank and reduced pressure deep distillation method

Abstract

The invention discloses a deep reduced pressure flash tank and a reduced pressure deep distillation method. The reduced pressure flash tank comprises a tank body and internal members of the tank. The internal members comprises a feeding inlet distributor arranged in a gas phase zone at the upper part of the reduced flash tank and a rotary disk arranged above a liquid surface of the lower part liquid phase zone, wherein the rotary disk is fixed on a rotary shaft arranged in an axis direction of the tank body. In the reduced pressure deep distillation method, the reduced pressure flash tank is arranged behind the reduced pressure tower; the atmospheric pressure bottom oil is heated by a reduced pressure furnace and introduced to the reduced pressure tower through a reduced pressure transfer line; reduced pressure light fraction oil is pumped out from the lateral line of the reduced pressure tower; reduced pressure heavy oil is pumped out from the bottom of the tower and introduced to the reduced pressure flash tank; the obtained gas phase is introduced to a gas-liquid separation tank; the reduced pressure light fraction oil is discharged from the bottom of the gas-liquid separation tank; and the flashed reduced pressure residual oil is discharged from the bottom of the reduced pressure flash tank. The deep reduced pressure flash tank and the reduced pressure deep distillation method can obviously increase distillation yield during a distillation process of crude oil, reduce energy consumption during the process and increase economic benefits of the apparatus.

Description

Technical field [0001] The invention belongs to the field of petroleum refining, and relates to a deep decompression flash tank and a decompression deep drawing method and device, in particular to a crude oil processing method and device for improving the yield of distillate oil in a crude oil vacuum distillation process. technical background [0002] The crude oil atmospheric and vacuum distillation process of the refinery is the first process of petroleum refining. It is divided into components of different distillation ranges by distillation to meet the process requirements of products and downstream equipment for raw materials. Its light oil yield and energy consumption directly affect the economic benefits of petroleum refining. Usually, the total extraction rate of the light distillate oil of the device, the energy consumption of the device and the content of the fraction <500°C or <538°C in the vacuum residue are used as indicators to measure the operation of the dev...

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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