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

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  • Work starting method for catalytic cracking unit

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Example Embodiment

[0035] Example 1

[0036] Example 1 illustrates the effect of using the method provided by the present invention to perform hydrothermal treatment on fresh catalyst under pressure.

[0037] A pressurized fixed fluidized bed experimental device was used to simulate the conditions at the start-up stage of the catalytic cracking unit regenerator for experiments. Load the MMC-2 fresh catalyst into the fixed fluidized bed, and at the same time pass air as the fluidizing medium into the bottom of the fluidized bed, and use electric heating to heat the catalyst in the fixed fluidized bed and stabilize it at 650℃ to vaporize the water After being superheated to 400°C, it is passed into the bottom of the fluidized bed, and air injection into the fluidized bed is stopped, and the apparent linear velocity of water vapor in the fluidized bed is controlled to 0.4 m / s. The pressure of the fixed fluidized bed is controlled at 0.4MPa through the automatic pressure regulating valve at the outlet o...

Example Embodiment

[0038] Example 2

[0039] Example 2 illustrates the effect of using the method provided by the present invention to further improve the hydrothermal treatment of fresh catalyst under conditions of temperature and high pressure.

[0040] The basic method of the experiment is the same as in Example 1, except that the fixed fluidized bed pressure is controlled at 2.5MPa, the catalyst temperature is controlled at 670°C, and the apparent linear velocity of water vapor in the fluidized bed is 0.7 m / s. The catalyst was subjected to hydrothermal treatment under the above conditions for 12 hours. The main treatment conditions and the slightly reactive 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, loading a fresh catalyst into the regenerator, opening a valve on a catalyst access pipeline of an external cooler, infusing water vapor to the external cooler, and increasing 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, opening a valve on a regenerated catalyst conveying pipeline, 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, thereby obtaining a reaction product. 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 李正孙益群谢朝钢
Owner CHINA PETROLEUM & CHEM CORP
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