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Residual oil hydrogenation refining process for stopping and starting fractionating tower system and changing direction of cold low-fraction oil

A residual oil hydrogenation and fractionation tower technology, which is applied in hydrotreating process, petroleum industry, processing hydrocarbon oil, etc., can solve the problems of long separation process and high energy consumption, increase the temperature of raw materials entering the furnace, and reduce fuel consumption. , process and operation simplification effect

Active Publication Date: 2018-09-21
SOUTH CHINA UNIV OF TECH
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  • Claims
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AI Technical Summary

Problems solved by technology

When the yield of light oil is very low, the existing residual oil hydrotreating unit does not combine processes with other units with similar principles, and is still equipped with a complete product separation system, resulting in the disadvantages of long separation process and high energy consumption

Method used

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  • Residual oil hydrogenation refining process for stopping and starting fractionating tower system and changing direction of cold low-fraction oil
  • Residual oil hydrogenation refining process for stopping and starting fractionating tower system and changing direction of cold low-fraction oil

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Embodiment

[0036] A kind of residual oil hydrotreating flow process of the present embodiment, its process flow chart is as follows figure 2 shown. Compared with the process of the comparison example, the following improvements were implemented:

[0037] (1) The cold and low-separation oil from the cold and low-separation tank 4 passes through the cold and low-separation oil once to the hot and low-separation gas once. After heat exchanger 2 exchanges heat with the hot and low-separation gas, it does not enter H 2 S stripper 7, but after being cooled to about 40 ° C by circulating water in the secondary circulating water cooler 22 of cold low-separation oil, and H 2 The unstable naphtha at the top of the S stripper is mixed, and sent to the gasoline and diesel hydrotreating unit (such as entering its H 2 S stripper), with the help of its separation system to complete the separation of gas, naphtha and diesel fractions.

[0038] (2) Shut down H 2 The fractionation tower system flow a...

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Abstract

The invention belongs to the technical field of petroleum chemical industry, and discloses a residual oil hydrogenation refining process for stopping and starting a fractionating tower system and changing a direction of cold low-fraction oil. The cold low-fraction oil from a cold low-fraction tank does not enter an H2S stripping tower after the heat exchanging and is mixed with unstable naphtha onthe top of the H2S stripping tower, the mixture is sent into a gasoline-diesel hydrogenation refining apparatus to be separated, then fractionating tower system behind the H2S stripping tower is closed, and the bottom oil of the H2S stripping tower is used for directly enter the raw material primary heater to heat raw materials. The calculation shows that the investment is extremely small, the implementation performance is high, not only can the operation be simplified, but also the energy consumption can be reduced by about 60 percent, and no influence is produced on the quality of the yieldof the residual oil hydrogenation process and the refined residual oil. The residual oil hydrogenation refining process is suitable for improving an old apparatus and constructing a novel apparatus.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and in particular relates to a residual oil hydrotreating process for shutting down a fractionation tower system and changing the destination of cold low-fraction oil. Background technique [0002] Residual oil hydrofining is a process for pretreating residual oil to provide raw materials for subsequent processing such as catalytic cracking. It consists of three parts: reaction, circulating hydrogen separation and product separation. In the reaction part, the raw materials are heat-exchanged and mixed with circulating hydrogen and new hydrogen, and then sent to the reaction feed heating furnace, heated to a specified temperature and then fed into the reactor, where desulfurization, denitrogenation, and demetallization are carried out under high temperature, high pressure, and hydrogen-facing environments. reaction, accompanied by a small amount of naphtha and diesel. Thereafter, ...

Claims

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Application Information

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IPC IPC(8): C10G67/00
CPCC10G67/00C10G2400/02C10G2400/04
Inventor 李国庆李华刘建平贺晓军夏勇
Owner SOUTH CHINA UNIV OF TECH
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