Method and device for crude oil deep vacuum distillation
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A crude oil and deep drawing technology, which is applied in the direction of multi-stage series refining process, can solve the problems of unfavorable vacuum distillation tower operation, thermal stress safety design and installation difficulty, so as to reduce energy consumption and irreversibility , Improve the effect of pulling out rate
Active Publication Date: 2013-04-24
CHINA PETROLEUM & CHEM CORP +1
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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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Embodiment 1
[0048] The method of the present invention is used in the design of a newly-built 10 million tons / year crude oil atmospheric and vacuum distillation unit, and the process flow of the decompression part and the accompanying figure 1 Same as shown.
[0049] 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.
[0050] The constant bottom oil 1 is fed into the vacuum distillation device at 550 tons / hour, heated to 370°C by the primary gasification furnace 2,...
Embodiment 2
[0063] 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.
[0064] 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.
[0065] The constant bottom oil 1 is fed into the vacuum distillation device at 550 tons / hour, heated to 370°C by the primary gasification furnace 2, and then enters the primary flash tank 3, and the vacuum slag returned from the bottom of the vacuum distillation tower 8 The oil 13 enters the upper part of the primary flash tank, and the two feeds are subjected to vacuum flash evaporatio...
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Abstract
The invention discloses a method and a device for crude oil deep vacuum distillation. The method disclosed in the invention includes: introducing atmospheric tower bottom oil into a primary gasification furnace, conducting heating and leaving the oil to enter a primary flash tank to undergo separation, making the obtained gas phase enter a vacuum tower upper fractionation section, and letting the liquid phase enter a second stage gasification furnace; heating the liquid phase and making it enter a second-stage flash tank, leaving the obtained gas phase to enter a vacuum tower middle fractionation section, and making the obtained liquid phase enter a third-stage gasification furnace; heating the liquid phase and making it enter a third-stage flash tank, letting the obtained gas phase enter a vacuum tower lower fractionation section, and leaving the obtained liquid phase to enter a vacuum tower flash section; subjecting the feed of each section to vacuum distillation is the vacuum, extracting a lateral line product from a vacuum tower lateral line, and extracting vacuum residual oil from the tower bottom; and introducing part of the vacuum residual oil into the flash tanks of different stages respectively. The method provided in the invention can significantly improve the distillate yield of the crude oil in the distillation process, reduce device energy consumption, increase device economic benefits, and save device investment.
Description
technical field [0001] The invention belongs to the field of petroleum refining, and in particular relates to a crude oil vacuum deep drawing method and device. 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 fractionation. The vacuum distillation process requires extracting as much vacuum distillat...
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