Shutdown method for heavy oil suspension bed hydrogenation process

A suspended bed, heavy oil technology, applied in the petroleum industry, hydrocarbon oil cracking, processing of hydrocarbon oil, etc., can solve the problems of not emphasizing the shutdown process and complex process, saving shutdown time and operating costs, flexible operation, and shortening shutdown. effect of time

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, and the shutdown process of this process is not emphasized, indicating that it only refers to the traditional fixed bed shutdown process, that is, maintaining high pressure The operating conditions remain unchanged. After the reactor temperature is lowered to a certain temperature, the reactor is cleaned with wax oil and diesel oil respectively, and then the device is purged with hydrogen, and the power is turned back to relieve pressure and stop working.
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

[0019] This embodiment is a shutdown method for a heavy oil suspended bed hydrogenation unit. The specific operation process is: after the normal operation of the device, the heavy oil raw material is stopped, and the gas is introduced under the precursor of maintaining the original hydrogen circulation volume, so that the total gas circulation volume is 3 times of the hydrogen circulation volume during the normal operation of the equipment. At the same time, the temperature of the reactor was lowered to 350°C at a rate of 20°C / h. After the constant temperature gas was purged for 5 hours, the system pressure was reduced to 1MPa, and the oil pump was turned on, and the hydrogenated distillate oil was pumped into the suspended bed at 200-350°C for hydrogenation. Constant temperature cleaning, space velocity is 4h -1 After cleaning the device for 35 hours, stop feeding distillate oil, increase the total air intake to 10 times the hydrogen circulation volume during normal operatio...

Embodiment 2

[0021] According to the method described in Example 1, this example is a shutdown method for a heavy oil suspended bed hydrogenation unit. The specific operation process is: after the normal operation of the device, the heavy oil raw material is stopped, and natural gas is introduced while maintaining the precursor of 1 / 3 of the original hydrogen circulation volume, so that the total gas circulation volume is half of the hydrogen circulation volume during the normal operation of the equipment. 2. At the same time, reduce the temperature of the reactor to 300°C at a rate of 20°C / h. After purging the constant temperature gas for 6 hours, reduce the system pressure to 2MPa, turn on the oil pump, and pump into the suspension bed hydrogenation distillate at 240-350°C The oil is cleaned at a constant temperature with a space velocity of 6 hours -1 , After cleaning the device for 30 hours, stop feeding distillate oil, increase the total air intake to 6 times the hydrogen circulation ...

Embodiment 3

[0023] According to the method described in Example 1, this example is a shutdown method for a heavy oil suspended bed hydrogenation unit. The specific operation process is as follows: after the normal operation of the device, the heavy oil feedstock is stopped, and the gas phase feed is switched to natural gas at the same time, so that the gas circulation volume is 5 times that of the hydrogen gas circulation volume during the normal operation of the device, and at the same time, the reaction rate is 20°C / h. After the temperature of the device drops to 320°C and the gas is purged for 3 hours, the system pressure is reduced to 0.6MPa, the oil pump is turned on, and the hydrogenated distillate oil in the suspension bed is pumped into the suspension bed at 200-350°C for constant temperature cleaning, and the space velocity is 8h -1 , After cleaning the device for 20 hours, stop feeding distillate oil, continue to maintain gas purge for 6 hours, then stop gas, reduce pressure, and...

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Abstract

The invention discloses a shutdown method for a heavy oil suspension bed 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; lowering the pressure of the device to below 2MPa; 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 heavy oil suspension bed hydrogenation process under high pressure operating conditions. 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G45/00C10G47/00C10G49/00
Inventor 贾丽刘建锟
Owner CHINA PETROLEUM & CHEM CORP
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