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Vacuum distillation method for gradual gasification segmented feed

A distillation method and staged feeding technology, which are applied in the field of gradual gasification and staged feed vacuum distillation, can solve problems such as unfavorable vacuum distillation tower operation, thermal stress safety design and installation difficulty, and avoid gas phase load Effects of uneven distribution, reduced energy consumption, and reduced irreversibility

Active Publication Date: 2015-04-01
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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  • Vacuum distillation method for gradual gasification segmented feed

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Embodiment 1

[0045] The method of the present invention is used in the design of a new 10 million tons / year crude oil atmospheric and vacuum distillation unit, and the decompression part process flow and figure 1 Same as shown.

[0046] The processing capacity of the decompression device is 5 million tons per year. The decompression process includes a primary gasifier, a primary flash tank, a secondary gasifier, a secondary flash tank, a tertiary gasifier, and a tertiary flash tank. Steam tank, vacuum distillation tower. The vacuum distillation tower is a structured packing tower, which is operated by a wet process. The steam blowing volume at the bottom of the tower is 1% of the feed to the tower, the operating pressure at the top of the tower is 1.315 kPa, and the pressure drop of the whole tower is 685 Pa.

[0047] The constant bottom oil 1 is fed into the vacuum distillation device at a rate of 550 tons / hour, heated to 370°C by the primary gasification furnace 2, and then enters the p...

Embodiment 2

[0059] The method of the present invention is used for the capacity expansion of a crude oil atmospheric and vacuum device. The normal pressure part is the same as the conventional atmospheric and vacuum device, and the decompression part mainly includes a first-stage gasifier, a first-stage flash tank, a second-stage gasifier, Two-stage flash tank, three-stage gasifier, three-stage flash tank, vacuum distillation tower.

[0060] The decompression tower is a structured packing tower, the operating pressure at the top of the tower is 1.315 kPa, and the pressure drop across the tower is 685 Pa.

[0061]The constant bottom oil 1 is fed into the vacuum distillation unit, heated to 370°C by the primary gasification furnace 2, and then enters the primary flash tank 3, and the gas phase at the top of the tank enters the upper fractionation section of the vacuum distillation tower 8, and the gas phase at the top of the tank is controlled to ensure The pressure of the primary flash tan...

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Abstract

The invention discloses a vacuum distillation method for gradual gasification segmented feed. The method includes: making atmospheric tower bottom oil enter a first stage gasification furnace, conducting heating to make the tower bottom oil enter a first stage flash tank to perform separation, leaving a gas phase to enter an upper fractionation segment of a vacuum tower, and leaving a liquid phase to enter a second stage gasification furnace; heating the liquid phase and making it enter a second stage flash tank, letting the generated gas phase enter a middle fractionation segment of the vacuum tower, and letting the generated liquid phase enter a third stage gasification furnace; heating the liquid phase and making it enter a third stage flash tank, letting the generated gas phase enter a lower fractionation segment of the vacuum tower, and letting the generated liquid phase enter a flash segment of the vacuum tower; and subjecting the feed of each segment to vacuum distillation in the vacuum tower, extracting a lateral line product from a vacuum tower lateral line, and extracting vacuum residue from the tower bottom. The method provided in the invention can substantially enhance the distillate yield of a crude oil vacuum distillation process, reduce equipment energy consumption, increase equipment economic benefits, and save equipment investment.

Description

technical field [0001] The invention belongs to the field of petroleum refining, and in particular relates to a gradual gasification stepwise feeding vacuum distillation method for improving the vacuum extraction rate in crude oil vacuum distillation. 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 vacuum distillation to reduce the pressure on the surface of the liquid by vacuuming, thereby reducing the boiling point of the liquid and vaporizing the relatively light components in the liquid mixture to achieve the purpose of f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G53/02
Inventor 张龙齐慧敏王海波李经伟王岩王明星
Owner CHINA PETROLEUM & CHEM CORP
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