Work starting method for catalytic cracking unit

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...

AI Technical Summary

Problems solved by technology

This method is implemented on small and medium-scale experimental devices, and is not suitable for catalytic cracking industrial devices

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