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Preheating method for residual oil raw material on bubbling bed

A fluidized bed and residual oil technology, which is applied in the field of preheating of the feed of fluidized bed hydrogenation reactor, can solve the problem that the temperature of the outlet stream of the heating furnace cannot be guaranteed, the long-term stable operation of the device is affected, and the reaction performance of the fluidized bed hydrogenation is affected. problems, to achieve the effect of ensuring the temperature requirements, avoiding condensation coking reaction, and avoiding excessive gas holdup

Active Publication Date: 2013-01-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent is to use a conventional heating furnace to heat the raw materials to the temperature required for the reaction, which will cause coking of the heating furnace tube and affect the heating and heat transfer effect, so that the temperature of the stream at the outlet of the heating furnace cannot be guaranteed, which will affect the final fluidized bed heating. The reaction performance of hydrogen, and because of the coking of the heating furnace tube, it brings operational safety hazards and affects the long-term stable operation of the device

Method used

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Examples

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Effect test

Embodiment 1

[0032]This example is an example of using a moving-bed preheating reactor to preheat residual oil. The specific process is as follows: a spent diesel hydrogenation catalyst (spherical, with a particle size of 0.6mm) heated to 600°C by a heating furnace and preheated The mixture of residual oil raw material heated to 300°C and hydrogen (wherein hydrogen accounts for 30% of the residual oil raw material volume) enters from the solid feed line and raw material feed line at the top of the moving bed preheating reactor respectively, wherein the hot solid matter is fed by Gravity is added, and the weight ratio of solid matter and residual oil raw material is 4.3, and the contact heat exchange time of raw material and hot solid matter in container is 30 minutes, and the flow outflow temperature of control preheating reactor outlet is 450 ℃, gauge pressure is 0.3MPa. The raw material flow after heat exchange is discharged from the middle and lower part of the container and enters the ...

Embodiment 2

[0035] This example is an example of using batch operation to preheat ebullated bed feed, using an empty cylinder reactor, and the specific process is: in the heating furnace, the waste residue oil hydrodenitrogenation catalyst (with a particle size of 0.8-1.1mm) Heating to 650°C, and then transporting it to the container by gravity from the top of the preheating reactor; then injecting the residual oil preheated to 250°C and hydrogen gas (wherein hydrogen accounts for 15% of the residual oil raw material volume) In the preheating reactor, it contacts with hot solid matter to exchange heat; wherein the weight ratio of waste catalyst to residual oil raw material is 3.5, the outflow temperature of the stream at the outlet of the preheating reactor is controlled to be 430°C, the operating pressure is normal pressure, and the reaction time is 50 minutes. The solid matter is not discharged from the reactor, and is directly heated by the method of oxidizing and burning charcoal in t...

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Abstract

The invention discloses a method for preheating a fluidized bed residual oil. The method comprises the following steps: solids heated to 400 to 800 DEG C and fed residual oil heated to 200 to 350 DEG C are delivered to a reactor to contact each other to undergo heat exchange reaction; and after hear exchange of raw materials, gases are separated by a separation device and liquid materials are delivered to a fluidized bed reactor. Solid subjected to heat exchange with the raw materials returns to a heating device to be heated again to be recycled. The method can ensure long-term operation of devices and avoid coking in a furnace tube caused by an extremely high temperature due to directly heating of raw material oil by the prior heating furnace. The method can be operated intermittently or continuously.

Description

technical field [0001] The invention relates to a method for preheating the feed of a fluidized bed (for processing heavy raw materials) hydrogenation reactor, and is especially suitable for the method for preheating low-quality residual oil with high contents of colloid, asphaltenes and metals. 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 residual oil has become an important part of the refining industry focus of development. Fluidized bed residual oil hydrogenation technology is one of the important means of processing residual oil raw materials. In the process of hydrocracking of fluidized bed residual oil, the usual situation is that the raw material of residual oil is heated to a certain temperature by a heating furn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10C1/19
Inventor 贾丽胡长禄杨涛贾永忠李鹤鸣叶跃元
Owner CHINA PETROLEUM & CHEM CORP
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