Reduced-pressure flash tank and reduced-pressure distillation method

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...

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

Images