Crude oil reduced pressure distillation method and apparatus for reducing yield of residual oil

Abstract

The invention discloses a crude oil reduced pressure distillation method for reducing yield of residual oil. Atmospheric tower bottom oil is introduced into a first stage flash tank for separation after being heated in a first stage gasifier; 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 liquid phase is introduced to a reduced pressure flash section; gas phases obtained in various stages are introduced to the upper, the middle and the lower fractional distillation sections of reduced pressure tower; lateral line products are pumped out from lateral lines of the reduced pressure tower; a part of residues at the bottom of the tower is introduced to the flash tanks in the various stages, wherein at least two rotary evaporation coils are arranged in a gas phase zone in the upper part of the reduced pressure flash tower; tank walls between the two rotary evaporation coils are provided with baffle plates for preventing wall flows; and the rotary evaporation coils are fixed on a rotary shaft at a longitudinal shaft center position of the tank body. The method provided by the invention can obviously reduce the yield of the reduced pressure residual oil, increase economic benefits of the apparatus, reduce energy consumption of the apparatus, and save investment for the apparatus.

Description

technical field [0001] The invention belongs to the field of petroleum refining, and relates to a crude oil vacuum distillation method and device for reducing the yield of residual oil, in particular to a device for increasing the extraction rate, reducing the yield of residual oil, and reducing the yield of residual oil in the vacuum distillation process of crude oil. Energy consumption, method and device for increasing economic benefit of crude oil vacuum distillation unit. technical background [0002] Atmospheric and vacuum distillation process of crude oil in refinery 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 devices 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 vacuum distillation process is to use the principle of v...

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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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