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A Method of Improving the Operation Safety of Hydrocracking Unit

A hydrocracking and safety technology, applied in hydrotreating process, petroleum industry, treatment of hydrocarbon oil, etc., to improve the temperature matching problem, save manpower, and reduce the difficulty of operation

Active Publication Date: 2018-06-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although the above methods have their own characteristics, the cooling method used in the reaction system is still the way of injecting cold hydrogen or (and) cold oil through the cold hydrogen pipe / cooling oil pipe. Although it has the effect of reducing the reaction temperature, it does not carry out Under the premise of transformation, it is still impossible to fundamentally solve the problem of difficult temperature matching between the outlet of the refining reactor and the inlet of the cracking reactor that often exists in the industry

Method used

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  • A Method of Improving the Operation Safety of Hydrocracking Unit
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  • A Method of Improving the Operation Safety of Hydrocracking Unit

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Embodiment 1

[0041] use figure 1 In the process flow shown, a hydrocracking reaction is carried out, a certain amount of ammonia gas is injected (anhydrous liquid ammonia is injected through a passivation system), and the concentration of ammonia in the circulating hydrogen at the inlet of the cracking reactor is controlled to be 2000 μL / L. The inlet of the device is assisted to inject cold hydrogen to reduce the temperature to a certain extent. The combination of the two can improve the safety of the device operation. The operating conditions and results are listed in Table 3.

Embodiment 2

[0043] use figure 1 In the process flow shown, the hydrocracking reaction is carried out, the gas containing ammonia is injected (anhydrous liquid ammonia is injected through the passivation system), the ammonia concentration in the circulating hydrogen at the inlet of the cracking reactor is controlled to be 5000 μL / L, and the cooling of the cracking reactor is stopped at the same time. The injection of hydrogen only depends on the partial pressure of ammonia to improve the safety of device operation. The operating conditions and results are listed in Table 3.

Embodiment 3

[0045] use figure 2 In the process flow shown, the hydrocracking reaction is carried out; the passivation system and the cooling hydrogen system are used to simultaneously inject anhydrous liquid ammonia between the cracking reactor inlet and each cracking catalyst bed. Separately control the ammonia concentration in the cracking reactor inlet and the mixed circulation hydrogen at the inlet of each bed layer to 2000μL / L; at the same time, stop the injection of cold hydrogen in the cracking reactor, and only rely on the partial pressure of ammonia to improve the safety, operating conditions and operation of the unit. The results are listed in Table 3.

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Abstract

The invention discloses a hydrocracking method. This method does not require any modification of the hydrocracking unit, and only uses the existing process of the unit to inject passivation gas containing ammonia into the catalyst bed through the inlet of the cracking reactor to reduce its reactivity and prevent product distribution. Under the premise of major changes, the reaction temperature of the cracking catalyst is increased, and the outlet temperature of the refining reactor and the inlet temperature of the cracking reactor can be reasonably matched to the greatest extent, which improves the safety and flexibility of the device operation and the emergency response. Ability to avoid the occurrence of over-temperature phenomenon, and also reduce the energy consumption of the device to a certain extent.

Description

technical field [0001] The invention relates to a hydrocracking process, in particular to a method for improving the operation safety of a hydrocracking unit. It mainly means that by injecting ammonia-containing gas at the inlet of the cracking reactor, without affecting the yield of each fraction product, the safety of the operation of the hydrocracking unit can be improved to the maximum extent, and the risk of over-temperature can be reduced. It is especially suitable for processing low-quality high-quality Hydrocracking method of sulfur-high-nitrogen raw material oil. Background technique [0002] Hydrocracking technology is one of the high-quality heavy oil lightening technologies. It has many advantages such as strong adaptability of raw materials, flexible product solutions, high yield of liquid products, and good product quality. increasing trend. As one of the main processes for deep processing of heavy oil, hydrocracking can not only directly produce clean motor ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G67/02
Inventor 王仲义彭冲崔哲孙士可黄新露吴子明
Owner CHINA PETROLEUM & CHEM CORP
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