In-series alternated hydrotreating method and system for fixed-bed residue oil

A technology for hydrotreating and hydrotreating pretreatment, which is applied in hydrotreating process, hydrocarbon oil treatment, petroleum industry, etc., can solve problems such as long-term operation of unfavorable devices, insufficient capacity of scale and impurity capacity, and impact on economic efficiency of refineries, etc. question

Active Publication Date: 2019-11-26
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after parallel and series operation, the method needs to stop and replace the catalysts of each hydrogenation pretreatment reactor, and requires a long shutdown time, and cannot continue hydrogenation of residual oil for a long time, thereby affecting the economic efficiency of the refinery; , the pressure drop of each hydrogenation pretreatment reactor is at the highest level in the late stage of operation, and it is also operated in series, which makes the total pressure drop of hydrogenation pretreatment very high. If the original operating conditions are maintained, it will affect the main The catalytic activity of the catalyst, this loss of catalytic activity is irreversible
In order to ensure the catalytic activity of the main catalyst, it is necessary to further increase the reaction severity of the front hydrogenation pretreatment and increase the reaction temperature to a greater extent, which will increase the load on the heating...

Method used

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  • In-series alternated hydrotreating method and system for fixed-bed residue oil
  • In-series alternated hydrotreating method and system for fixed-bed residue oil
  • In-series alternated hydrotreating method and system for fixed-bed residue oil

Examples

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Embodiment 1

[0055] This embodiment adopts as figure 1 Shown reaction system, concrete reactor and connection relation are as follows:

[0056] The reaction system includes a first hydrotreating reactor 1, a second hydrotreating reactor 2, a third hydrotreating reactor 3, a hydrotreating reactor 5, a hydrotreating reactor 6, a hydrotreating Reactor 7. The main reaction feed pipeline L1 is connected with the first hydrogenation pretreatment reactor 1, the second hydrogenation pretreatment reactor 2, and the third hydrogenation pretreatment reactor 3 through the valve body 21, the valve body 22, and the valve body 23 respectively. The inlets are connected, and the outlets of the first hydrogenation pretreatment reactor 1, the second hydrogenation pretreatment reactor 2, and the third hydrogenation pretreatment reactor 3 are respectively connected with the reaction outlet through the valve body 24, the valve body 25, and the valve body 26. The main feed pipeline L2 is connected, and the fir...

Embodiment 2

[0082] This embodiment adopts as figure 2 Shown reaction system, concrete reactor and connection relation are as follows:

[0083]The reaction system comprises a first hydroprocessing reactor 1, a second hydroprocessing reactor 2, a third hydroprocessing reactor 3, a fourth hydroprocessing reactor 4, a hydroprocessing reactor 5, Hydrotreating reactor 6, Hydrotreating reactor 7. The main reaction feed pipeline L1 is connected with the first hydrogenation pretreatment reactor 1, the second hydrogenation pretreatment reactor 2, and the third hydrogenation pretreatment reactor through valve body 21, valve body 22, valve body 23, and valve body 24, respectively. Reactor 3, the inlet of the fourth hydrogenation pretreatment reactor 4 are connected, the first hydrogenation pretreatment reactor 1, the second hydrogenation pretreatment reactor 2, the third hydrogenation pretreatment reactor 3, the fourth hydrogenation pretreatment reactor The outlet of the hydrogen pretreatment reac...

Embodiment 3

[0107] This example adopts the reaction system, reaction raw materials and reactor rotation method of Example 1, the difference is: the first hydrogenation pretreatment reactor 1, the second hydrogenation pretreatment reactor 2, the third hydrogenation pretreatment The ratio of demetallization agent to protective agent in reactor 3 is 1:1, and remains unchanged for each rotation. The switching time of the hydrogenation pretreatment reactor is shown in Table 6.

[0108] In Example 3, due to the deactivation of the hydrotreating catalyst and the pressure drop of the reactor in the main reaction zone reaching the design value, the operation was forced to shut down. The operating cycle is shown in Table 7.

[0109] The switching time of hydrogenation pretreatment reactor in the embodiment 3 of table 6

[0110] switch for the first time second switch switch for the third time fourth switch switching time, h 5000 7500 9300 10800

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Abstract

The invention discloses an in-series alternated hydrotreating method and system for fixed-bed residue oil. The method comprises the following steps: a hydropretreating reaction zone and a hydrotreating reaction zone are arranged in series for residue oil hydrotreating, and the hydropretreating reaction zone comprises N hydropretreating reactors, wherein the reactors from a first hydropretreating reactor to a (N-1)th hydropretreating reactor are sequentially connected in series to be used as an (N-1)-stage online hydropretreating reactor, and a Nth hydropretreating reactor is used as an off-line hydropretreating reactor; when pressure drop in the first hydropretreating reactor rises to a designed upper limit of pressure drop or the activity of a catalyst is lower than a required value, thefirst hydropretreating reactor is switched out, and the Nth hydropretreating reactor is used as the (N-1)-stage online hydropretreating reactor; and switching is performed according to the above manner, so that an uninterrupted (N-1)-stage hydropretreating reaction can be realized. The method provided by the invention can improve the utilization efficiency of a main catalyst and the operation stability of a device, and greatly extend the operating time of a hydrotreating reactor.

Description

technical field [0001] The present invention relates to a fixed bed residual oil hydrogenation treatment method and system, in particular to a fixed bed residual oil hydrogenation treatment method and system which can be rotated in series. Background technique [0002] As crude oil becomes heavier and worse, more and more heavy oil and residual oil need to be processed. The main purpose of the residue oil hydrotreating process is to greatly reduce the content of impurities such as sulfur, nitrogen, and metals in the residue oil raw material through hydrogenation treatment, and to convert non-ideal components such as polycyclic aromatics, colloids, and asphaltenes through hydrogenation. Increase the hydrogen-to-carbon ratio, reduce the residual carbon content, and significantly improve the cracking performance. [0003] Fixed bed residual oil hydrogenation technology is a deep processing technology for heavy oil. Under the condition of high temperature and high pressure hydr...

Claims

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Application Information

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IPC IPC(8): C10G65/02
CPCC10G65/02
Inventor 翁延博耿新国刘铁斌李洪广
Owner CHINA PETROLEUM & CHEM CORP
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