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A method and system for rotating fixed-bed residual oil hydrotreating

A hydrogenation treatment and hydrogenation pretreatment technology, which is applied in the fields of hydrogenation treatment process, hydrocarbon oil treatment, petroleum industry, etc., can solve the problems of insufficient scale and impurity capacity, increased heating furnace load, low proportion of protective agent, etc. Achieve the effects of stable operation, slow down the deactivation rate, and stable material properties

Active Publication Date: 2021-10-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 furnace. Sometimes the original design load may be too small to meet heating requirements
[0007] In the above residual oil hydrogenation process, when the fixed bed is filled with hydrogenation protecting agent and hydrodemetallization catalyst at the same time, if a lower proportion of hydrodemetallation agent is used, the hydrodemetallization performance of the entire catalyst system is insufficient, especially At the end of the operation, the metal-accommodating capacity is low, which leads to the rapid deactivation of the catalyst in the main reaction zone, which is not conducive to the long-term operation of the device; Insufficient scale and impurity capacity of the hydrogenation pretreatment reactor leads to a rapid rise in the pressure drop of the hydrogenation pretreatment reactor, shortens the normal operation time, and soon enters the end of operation, resulting in shutdown, which is also not conducive to the long-term operation of the device

Method used

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  • A method and system for rotating fixed-bed residual oil hydrotreating
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  • A method and system for rotating fixed-bed residual oil hydrotreating

Examples

Experimental program
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Effect test

Embodiment 1

[0051] This embodiment adopts as figure 1The reaction system shown includes a first hydrotreating reactor 1, a second hydrotreating reactor 2, a third hydrotreating reactor 3, a hydrotreating reactor 5, and a hydrotreating reactor 6 , Hydrotreating reactor 7. The main reaction feed pipeline L1 is respectively connected to the inlets of the first hydrogenation pretreatment reactor 1, the second hydrogenation pretreatment reactor 2, and the third hydrogenation pretreatment reactor 3 through three inlet pipelines. The inlet pipelines are all equipped with inlet valve bodies, that is, the main reaction feed pipeline L1 passes through the valve body 21, the valve body 22, and the valve body 23 to connect with the first hydrogenation pretreatment reactor 1 and the second hydrogenation pretreatment reactor 2 respectively. , The inlet of the third hydrogenation pretreatment reactor 3 is connected; The reaction discharge main pipeline L2 is connected with the first hydrogenation pretr...

Embodiment 2

[0076] This example is basically the same as Example 1, except that the raw material is residual oil B, the properties of the specific raw material are shown in Table 1, the reaction temperature and switching time of the hydrogenation pre-reactor are shown in Table 4 and Table 5, and the residual oil is hydrogenated to form See Table 6 for oil properties.

[0077] The reaction condition of hydrogenation pretreatment reaction zone in the embodiment 2 of table 4

[0078]

[0079] The switching time of hydrogenation pretreatment reactor in the embodiment 2 of table 5

[0080] switch for the first time second switch switch for the third time fourth switch switching time, h 6500 9400 11900 13750

Embodiment 3

[0082] 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.

[0083] In Example 3, due to the deactivation of the hydrotreating catalyst and the pressure drop of the reactor in the main reaction zone reached the design value, the operation was forced to shut down. The operating cycle is shown in Table 7.

[0084] The switching time of hydrogenation pretreatment reactor in the embodiment 3 of table 6

[0085] switch for the first time second switch switch for the third time fourth switch switching time, h 5000 7300 9000 10500

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Abstract

The invention discloses a method and system for hydrogenation treatment of residual oil in a fixed bed which can be rotated. In this method, the first hydrogenation pretreatment reactor is connected in series with the second hydrogenation pretreatment reactor as an online hydrogenation pretreatment reactor, when the pressure drop in the first hydrogenation pretreatment reactor rises to the pressure drop design upper limit Or when the catalyst activity is lower than the requirement, cut out the first hydrogenation pretreatment reactor and as off-line hydrogenation pretreatment reactor, then press the second hydrogenation pretreatment reactor and the third hydrogenation pretreatment reactor in parallel, The third hydrogenation pretreatment reactor is connected in parallel with the first hydrogenation pretreatment reactor, and the sequence of the first hydrogenation pretreatment reactor and the second hydrogenation pretreatment reactor being connected in series is switched, thereby realizing that there are two hydrogenation pretreatment reactors The treatment reactors are online at the same time, and through multiple cycle rotations, uninterrupted hydrogenation pretreatment reactions can be realized. The method can improve the utilization efficiency of the main catalyst and the stability of the device operation, and greatly prolong the operation time of the hydrogenation 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. 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 hydrogenation,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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