Work starting method for catalytic cracking unit

A catalytic cracking device and catalyst technology, which is applied in the direction of catalytic cracking, cracking, petroleum industry, etc., to achieve the effect of saving cost and investment

Active Publication Date: 2014-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is implemented on small and medium-scale experimental de

Method used

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  • Work starting method for catalytic cracking unit

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Example 1 illustrates the effect of hydrothermal treatment of fresh catalyst under pressurized conditions using the method provided by the present invention.

[0036] A pressurized fixed fluidized bed experimental device was used to simulate the conditions in the start-up stage of the catalytic cracking unit regenerator. Put the MMC-2 fresh catalyst into the fixed fluidized bed, and at the same time, use the air as the fluidized medium, pass it into the bottom of the fluidized bed after being heated to about 350°C by the preheating furnace, and pass through the automatic pressure regulating valve at the outlet of the fixed fluidized bed The fixed fluidized bed pressure is controlled at 0.5MPa. The catalyst in the fixed fluidized bed was heated and stabilized at 650°C by means of electric heating. The water is vaporized and superheated to 400°C in a two-stage heating furnace, and then passed into the bottom of the fluidized bed. The catalyst was hydrothermally treated ...

Embodiment 2

[0038] Example 2 illustrates the effect of using the method provided by the present invention to further increase the pressure of the fresh catalyst for hydrothermal treatment.

[0039] The basic method of the experiment is the same as in Example 1, except that the pressure of the fixed fluidized bed is controlled at 0.7 MPa, and the temperature of the catalyst is controlled at 600°C. The catalyst was hydrothermally treated under the above conditions for 9 hours. The main conditions of the treatment and the microreaction activity of the catalyst after treatment are listed in Table 2.

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Abstract

The invention relates to a work starting method for a catalytic cracking unit. The method comprises the steps of infusing a hot fluidizing medium to a regenerator and a reactor, so as to heat the regenerator and the reactor, shutting off valves between the regenerator and the reactor, and loading a fresh catalyst into the regenerator; when the regenerator reaches a certain temperature, infusing water vapor to a degassing tank, so as to increase the pressure of the regenerator; after the activity of the catalyst in the regenerator is lowered by 10-50%, stopping infusing the water vapor, recovering the pressure of the regenerator, and conveying the catalyst to the reactor; enabling the catalyst in the reactor to enter a precipitator for gas-solid separation, and returning the separated catalyst to the regenerator; spraying a hydrocarbon oil raw material into the reactor for catalytic cracking reaction. According to the method, the activity of the fresh catalyst can be rapidly lowered to an equilibrium catalyst level before oil spraying by making full use of the existing devices and conditions, so that the catalyst replacement link in the conventional methods is avoided, and the unit is put into normal operation in shorter time.

Description

technical field [0001] The invention relates to a method for starting a catalytic cracking unit, more specifically, a method for starting a reactor and a regenerator system of an industrial catalytic cracking unit using fresh catalyst. Background technique [0002] Fluid catalytic cracking (FCC) is the most important heavy oil lightening process in the current oil refining industry. With the gradual increase in the demand for light petroleum products, new catalytic cracking units have been continuously put into operation around the world. [0003] The start-up process of the reactor and regenerator system of the catalytic cracking industrial unit generally follows the following basic steps: firstly, the air is heated in the auxiliary combustion chamber by burning combustible gas and / or liquid, and then injected into the regenerator and the reactor in sequence, so that the temperature of the two devices is raised to 350°C-550°C; then close the valve on the catalyst circulatio...

Claims

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Application Information

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IPC IPC(8): C10G11/18
Inventor 鲁维民李正谢朝钢
Owner CHINA PETROLEUM & CHEM CORP
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