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Shutdown method of fixed bed residual oil hydrogenation apparatus

A technology for hydrotreating unit and bed residue oil, which is applied in hydrotreating process, petroleum industry, processing hydrocarbon oil, etc., can solve problems such as unfavorable catalyst disassembly, unfavorable device cleaning, etc. Demolition-friendly effect

Active Publication Date: 2015-05-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, the conventional shutdown scheme is still used, which is not conducive to the cleaning of the device and the disassembly of the catalyst. Therefore, it is necessary to explore a new shutdown scheme that combines the characteristics of the hydrogenation reaction of residual oil, which is beneficial to the cleaning of the equipment and catalyst. economical and practical

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026]This embodiment is a shutdown method for a residual oil fixed-bed hydrogenation unit. The specific operation process is as follows: after the operation of the device, stop feeding the residual oil, reduce the temperature of the reaction system to 350°C at 10°C / h, reduce the amount of oil fed to 70% of the amount of oil fed into the device during normal operation, and at the same time reduce the The tail oil passes through the hydrodecarbonization / hydrodenitrification reactor, hydrodesulfurization reactor, hydrodemetallization reactor and hydrogenation protection reactor sequentially along the reverse direction of the normal feed to the unit. When the hydrogenation tail oil After discharging from the outlet of the protection reactor, switch all the distillation ranges to 350-500°C straight-run wax oil to replace the hydrogenated tail oil in the reaction system. When the outlet stream of the protection reactor contains less than 5% of the tail oil fraction >500°C , cool th...

Embodiment 2

[0028] This embodiment is a shutdown method for a residual oil fixed-bed hydrogenation unit. The specific operation process is: after the operation of the device, stop feeding the residual oil, lower the temperature of the reaction system to 360°C at 10°C / h, reduce the amount of oil fed to 80% of the amount of oil fed into the device during normal operation, and at the same time reduce the The tail oil passes through the hydrodecarbonization / hydrodenitrification reactor, hydrodesulfurization reactor, hydrodemetallization reactor and protection reactor sequentially along the reverse direction of the normal feed to the unit. After the outlet of the reactor is discharged, blend the hydrogenated tail oil with a distillation range of 350-500°C into the hydrogenated tail oil at a rate of 30% to replace the hydrogenated tail oil in the reaction system with straight-run wax oil until all the feed is a wax oil fraction. When the outlet stream of the protection reactor contains less tha...

Embodiment 3

[0030] This embodiment is a shutdown method for a residual oil fixed-bed hydrogenation unit. The specific operation process is as follows: after the operation of the device, stop feeding the residual oil, reduce the temperature of the reaction system to 350°C at 10°C / h, reduce the amount of oil fed to 70% of the amount of oil fed into the device during normal operation, and at the same time reduce the The tail oil passes through the hydrodecarbonization / hydrodenitrification reactor, hydrodesulfurization reactor, hydrodemetallization reactor and protection reactor sequentially along the reverse direction of the normal feed to the unit. After the outlet of the reactor is discharged, the hydrogenated tail oil in the reaction system is directly replaced with straight-run wax oil with a distillation range of 350-500°C. Cool down the reaction system to 300°C at 15°C / h, and directly replace the wax oil in the reaction system with diesel oil with a distillation range of 200-350°C. If...

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PUM

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Abstract

The present invention discloses a shutdown method of a fixed bed residual oil hydrogenation apparatus. The shutdown method comprises that: the apparatus is subjected to temperature decrease and amount decrease, hydrogenation tail oil enters the apparatus along the sequence opposite to the normal operation feeding sequence of the apparatus, wax oil is switched to wash the apparatus after the hydrogenation tail oil passes through the whole reaction system, the system is cooled after the washing with the wax oil is qualified, washing with diesel fuel is performed, the whole system is cooled after the apparatus washing with the diesel fuel is qualified, the diesel fuel feeding is stopped, hydrogen gas purging is performed, the whole apparatus is subjected to temperature decrease and pressure decrease after the hydrogen gas purging is performed for a certain time, nitrogen gas purging is performed, and the apparatus shutdown is completed. With the shutdown method of the present invention, the apparatus washing and the catalyst washing are easily achieved, and the catalyst disassembly is easily achieved.

Description

technical field [0001] The invention relates to a shutdown method of a hydrogenation unit. The method is suitable for the shutdown method of using multiple series reactors to process inferior raw materials, and is especially suitable for processing heavy and residual oil fixed-bed hydrogenation units with high content of asphaltene, residual carbon, metal and solid impurities. Background technique [0002] With the vigorous development of heavy crude oil and the changes in the demand structure of petroleum products worldwide, the market demand for light fuel oil continues to grow rapidly and the demand for heavy fuel oil decreases rapidly. The deep processing technology of heavy and residual oil has become the The focus of industrial development. The fixed bed residual oil hydrogenation process is currently the most mature and widely used heavy and residual oil upgrading technology. Conventional fixed-bed residual oil hydrogenation units usually use multiple reactors conne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G65/04
CPCC10G65/04
Inventor 贾丽贾永忠
Owner CHINA PETROLEUM & CHEM CORP
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