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Shutdown method for suspension bed heavy oil hydrogenation process

A technology for heavy oil and bed residue, which is applied in the petroleum industry, hydrocarbon oil cracking, and hydrocarbon oil treatment. It can solve the problems of unemphasized shutdown process and complicated process, so as to save downtime and operating costs, operate flexibly, shorten The effect of downtime

Active Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this patent, it is only introduced that under certain operating conditions, molybdenum and nickel active metals are used to carry out hydrogenation conversion of suspended bed heavy oil. After the temperature drops to a certain temperature, the reactor is cleaned with wax oil and diesel oil, and then the device is purged with hydrogen, and the power is turned off
The process is relatively complicated, and the technical advantages of the suspended bed are not fully utilized according to the characteristics of the suspended bed hydrogenation reactor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] This embodiment is a shutdown method for a suspended bed heavy oil hydrogenation unit. The specific operation process is: after the normal operation of the device, the heavy oil feedstock is stopped, and the coal gas is introduced under the premise of maintaining the original hydrogen circulation volume, so that the total gas flow rate is three times that of the hydrogen circulation volume during the normal operation of the device. Reduce the temperature of the reactor to 350°C at a rate of 20°C / h. After the gas is purged for 5 hours, the oil pump is turned on and pumped into the suspended bed hydrogenated distillate oil at 200-350°C for constant temperature cleaning with a space velocity of 4h -1 After cleaning the device for 35 hours, stop feeding the distillate, continue to keep the gas purging for 8 hours with the original intake volume, and then stop the gas, reduce the pressure, and return the power to complete the normal shutdown of the device.

Embodiment 2

[0022] According to the method described in Example 1, this example is a shutdown method for a suspended bed heavy oil hydrogenation unit. The specific operation process is: after the normal operation of the device, the heavy oil feedstock is stopped, and natural gas is introduced under the premise of maintaining the original hydrogen circulation volume, so that the total gas flow rate is 2.3 times the hydrogen circulation volume during the normal operation of the device. Reduce the temperature of the reactor to 300°C at a rate of 20°C / h. After the gas is purged for 6 hours, the oil pump is turned on and pumped into the suspended bed hydrogenated distillate oil at 240-350°C for constant temperature cleaning. The space velocity is 6h -1 After cleaning the device for 30 hours, stop feeding distillate oil, stop hydrogen supply, adjust the natural gas flow rate to 5 times the hydrogen circulation volume during normal operation of the device, and after purging for 6 hours, stop gas,...

Embodiment 3

[0024] According to the method described in Example 1, this example is a shutdown method for a suspended bed heavy oil hydrogenation unit. The specific operation process is: after the normal operation of the device, the heavy oil feedstock is stopped, and the coal gas is introduced under the premise of maintaining the original hydrogen circulation volume, so that the total gas flow rate is 5 times that of the hydrogen circulation volume during the normal operation of the device. The temperature of the reactor was lowered to 320°C at a rate of 20°C / h. After the gas was purged for 3 hours, the oil pump was turned on and pumped into the suspended bed hydrogenated distillate oil at 200-350°C for constant temperature cleaning. The space velocity was 8h -1 , After cleaning the device for 20 hours, stop feeding the distillate, continue to maintain the original gas speed for 6 hours, then stop the gas, reduce the pressure, and return the power to complete the normal shutdown of the dev...

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PUM

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Abstract

The invention discloses a shutdown method for a suspension bed heavy oil hydrogenation process. The method comprises the following steps of: after normal running of a device ends, stopping feeding raw oil; completely sweeping raw materials in the entire device and a physical flow left after a reaction with hot gas; lowering a reaction temperature to below 350 DEG C; feeding a distillate oil pump into the device for cleaning; cleaning at a constant temperature for a certain time interval; stopping feeding oil; increasing a gas sweeping amount; completely sweeping distillate oil for a washing device; stopping gas sweeping; lowering the temperature of the device to the normal temperature; and shutting down. Compared with the conventional suspension bed shutdown process, a shutdown operating process in the invention has the advantages of simplified operation, shortened shutdown time and contribution to saving shutdown time and saving operating cost.

Description

technical field [0001] The invention relates to a shutdown method of a suspended bed hydrogenation treatment process. Especially for the shutdown method of suspended bed hydrogenation process for processing heavy oil feedstock. 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 oil has become the development of the refining industry. focus. Suspension bed heavy oil hydrogenation technology has the characteristics of wide adaptability of raw materials and flexible operation, and is one of the important means of processing inferior heavy oil raw materials. The structure of the suspended bed hydrogenation reactor is simple, and usually an empty cylinder or a reactor with simple internal components (such as a thermowell, etc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G45/00C10G49/00C10G47/00
Inventor 贾丽韩照明葛海龙
Owner CHINA PETROLEUM & CHEM CORP
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