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Reduced pressure distillation method and device

A distillation method and vacuum distillation tower technology, which is applied in the field of petroleum refining, can solve problems such as unfavorable vacuum distillation tower operation, thermal stress safety design and installation difficulty, so as to improve feed gas-liquid separation and save equipment investment , the effect of low energy consumption

Active Publication Date: 2013-11-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • Reduced pressure distillation method and device

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Embodiment 1

[0035] The method of the invention is used in the design of a new crude oil atmospheric and vacuum unit.

[0036] The capacity of the decompression device is 1.2 million tons / year, and the decompression process includes a decompression furnace, a flash tower, and a decompression tower. The decompression tower is a structured packing tower, operated by a wet process, the bottom steam blowing volume is 1% of the tower feed, the top operating pressure is 1.315kPa, and the pressure drop of the whole tower is 600Pa~750Pa.

[0037] Atmospheric oil is fed into the vacuum distillation unit at a rate of 150 tons / hour, heated to 390°C to 400°C in the vacuum furnace, and then enters the vacuum flash tower. Cancel the oil transfer line, the flash tower is directly connected with the decompression tower, and the pressure of the flash tower is 10kPa. After adiabatic flash evaporation, the flash top gas accounts for 45.67% of the feed. The flash bottom oil enters the vacuum tower, and the produc...

Embodiment 2

[0043] The method of the present invention is used for the expansion and transformation of a crude oil atmospheric and vacuum plant, the atmospheric part is the same as the conventional atmospheric and vacuum plant, and the vacuum part mainly includes a vacuum furnace, a flash tower, and a vacuum tower.

[0044] The decompression tower is a structured packing tower, the top operating pressure is 1.315kPa, and the pressure drop across the tower is 600Pa~750Pa.

[0045] Atmospheric oil enters the vacuum distillation unit, is heated to 390℃~400℃ in the vacuum furnace, and then enters the vacuum flash distillation tower. Cancel the oil transfer line, and the flash tower is directly connected to the vacuum tower. The pressure of the flash tower is 10kPa. After adiabatic flash, the flash top gas accounts for 45.67% of the feed. The flash bottom oil enters the vacuum tower 15 from the side line of the vacuum tower. Draw out products 10 and 11. Vacuum residue is discharged from the bottom...

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Abstract

The invention discloses a reduced pressure distillation method and a reduced pressure distillation device. A flash tower is arranged between a reduced pressure furnace and a reduced pressure distillation tower, an oil transfer line is canceled, a reduced pressure distillation raw material is heated in the reduced pressure furnace and then directly enters the flash tower, and gas-liquid separation is performed in the flash tower; the liquid phase, namely flash bottom oil, discharged from the bottom of the flash tower is introduced into the reduced pressure distillation tower; and the gas phase, namely flash top gas, discharged from the top of the flash tower is condensed into liquid phase, and the liquid phase is led out of the device. According to the reduced pressure distillation method and the reduced pressure distillation device using the flash tower in back of the reduced pressure furnace, on the one hand, the yield of reduced pressure distillate is improved; and on the other hand, the conventional reduced pressure oil transfer line is canceled, the operation load of the reduced pressure tower is reduced, and the diameter of the reduced pressure tower can be properly reduced so that the equipment investment is saved and the operation cost is lowered.

Description

Technical field [0001] The invention belongs to the field of petroleum refining, and specifically relates to a process method and device for the vacuum distillation of crude oil, and more specifically, a vacuum distillation method that is beneficial to increase the extraction rate, reduce energy consumption, and save investment. Device. technical background [0002] Crude oil atmospheric and vacuum distillation process is the first process of petroleum refining, which divides crude oil into components of different distillation ranges by distillation to meet the process requirements of products and downstream equipment for raw materials. The light oil yield and energy consumption directly affect the economic benefits of petroleum refining. The conventional crude oil atmospheric and vacuum distillation process mostly adopts the process of "two furnaces and three towers": the crude oil enters the initial distillation tower (or flash distillation tower) after pretreatment, and then ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D3/10C10G7/06
Inventor 张龙王海波齐慧敏刘忠信
Owner CHINA PETROLEUM & CHEM CORP
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