Flash-strengthened crude oil reduced pressure deep distillation process

Abstract

The invention discloses a flash-strengthened crude oil reduced pressure deep distillation process. Atmospheric tower bottom oil is introduced into a first stage flash tank for separation after being heated in a first stage gasifier; a gas phase is introduced to an upper fractional distillation section of a reduced pressure tower; a liquid phase is introduced to a second stage gasifier and then to a second stage flash tank after being heated; the liquid phase is introduced to a third stage gasifier and then to a third stage flash tank after being heated; the gas phase is introduced to a lower fractional distillation section of the reduced pressure tower; the liquid phase is introduced to a flash section of the reduced pressure tower; feeding materials in various stages are introduced to the reduced pressure tower for reduced pressure distillation; lateral line products are pumped out from lateral lines of the reduced pressure tower; and residual oil is pumped from the bottom of the tower, wherein the upper gas phase zone of the reduced pressure flash tower is provided with a reduced pressure tower rotary evaporator; and the lower liquid phase zone of the reduced pressure flash tower is provided with a stripping gas distributor for introducing a high temperature stripping gas. The process provided by the invention can obviously increase distillation rate during a crude oil reduced pressure distillation process, reduce energy consumption of the apparatus, increase economic benefits of the apparatus, and save investment of the apparatus.

Description

technical field [0001] The invention belongs to the field of petroleum refining, and relates to a crude oil decompression and deep drawing process for enhanced flash evaporation, in particular to a decompression flash tank which is beneficial to improving the extraction rate of crude oil vacuum distillation and reducing unit energy consumption And crude oil vacuum deep drawing process method and device. technical background [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...

AI Technical Summary

Problems solved by technology

Since the oil transfer line must be more than 15m (to ensure that the gas-liquid phase has a certain stratification time, which is beneficial to improve product quality and the extraction rate of the vacuum tower), the large-diameter and long-distance oil transfer line occupies a large part of the investment in vacuum distillation equipment. At the same time, factors such as heat loss and pressure drop increase are not conducive to the operation of the vacuum distillation tower, and the resulting thermal stress and thermal displacement cause certain difficulties in design and installation in terms of safety.

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