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Crude oil pressure-reduced 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 optimize process design, reduce processing load, and reduce process Effect of pressure drop and heat loss

Inactive Publication Date: 2012-01-11
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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  • Crude oil pressure-reduced distillation method and device
  • Crude oil pressure-reduced distillation method and device

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Embodiment 1

[0034] The method of the invention is used in the design of a new crude oil atmospheric and vacuum device.

[0035] The processing capacity of the decompression unit is 1.2 million tons per year, and the decompression process includes a decompression furnace, a flash tower, and a decompression tower. The operating pressure of the flash tower is controlled at 8kPa to 10kPa, hydrogen gas accounting for 1% to 3% of the feed mass is introduced into the bottom of the tower, the hydrogen gas pipeline passes through the hearth of the vacuum furnace, and the hydrogen gas is heated to 380°C to 450°C. The decompression tower is a structured packing tower, which adopts wet process operation. The steam blowing volume at the bottom of the tower is 1% of the mass of the tower feed, the operating pressure at the top of the tower is 1.315kPa, and the pressure drop of the whole tower is 600Pa~750Pa.

[0036] The normal bottom oil is fed into the vacuum distillation unit at a rate of 150 tons p...

Embodiment 2

[0042] The method of the present invention is used for the expansion and transformation 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 decompression furnace, a flash tower and a decompression tower.

[0043] The decompression tower is a structured packing tower, the operating pressure at the top of the tower is 1.315kPa, and the pressure drop of the whole tower is 600Pa~750Pa.

[0044] The operating pressure of the flash tower is controlled at 8kPa to 10kPa, hydrogen gas accounting for 1% to 2% of the feed mass is introduced into the bottom of the tower, and the hydrogen gas pipeline passes through the hearth of the vacuum furnace to heat the hydrogen gas to 380°C to 450°C.

[0045] The normal bottom oil enters the vacuum distillation unit, is heated to 390°C to 400°C by a vacuum furnace, and then enters the vacuum flash tower. Cancel the oil tran...

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Abstract

The invention discloses a crude oil pressure-reduced distillation method and a crude oil pressure-reduced distillation device. A flash tower is arranged between a reduced-pressure furnace and a reduced-pressure distillation tower, an oil transfer line is eliminated, a reduced-pressure distillation raw material is heated in the reduced-pressure furnace and directly enter the flash tower, a small amount of stripping gas is introduced into the flash tower, and the liquid phase, namely flash bottom oil, obtained by gas-liquid separation in the flash tower is introduced into the reduced-pressure distillation tower; and a gas phase, namely flash top gas, discharged from the top of the flash tower is condensed into a liquid phase to be led out of the device. A high-temperature hydrogen or inert gas is introduced into the bottom of the flash tower. When the pressure-reduced distillation method and the pressure-reduced distillation device, in which the flash tower for high-temperature hydrogen or inert gas stripping flash tower is arranged behind the reduced-pressure furnace, are used, the yield of a reduced-pressure fraction oil is increased, the conventional reduced-pressure oil transfer line is not used, the operation load of the reduced-pressure furnace is lowered, and the tower diameter of the reduced-pressure tower can be reduced properly; therefore, equipment investment is reduced, and operation cost is reduced.

Description

technical field [0001] The invention belongs to the field of petroleum refining, and in particular relates to a process and device for vacuum distillation of crude oil. technical background [0002] Atmospheric and vacuum distillation of crude oil is the "leading" device of an oil refinery, and its light oil yield and energy consumption directly affect the economic benefits of oil 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 then is heated in the normal pressure furnace and enters the atmospheric tower, and the bottom oil of the atmospheric tower is passed through The heating of the vacuum furnace is sent to the vacuum tower by the vacuum transfer line to complete the atmospheric distillation and vacuum distillation of crude oil, and obtain products that meet the quality requirements a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G7/06B01D3/10
Inventor 张龙朴勇王海波
Owner CHINA PETROLEUM & CHEM CORP
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