Catalyst regeneration method and device with catalytic cracking device heat replenished

Abstract

The invention relates to a catalyst regeneration method with catalytic cracking device heat replenished. According to the method, fuel oil is injected into the bottom of a regenerator, and is mixed with a to-be-regenerated catalyst from a to-be-regenerated catalyst inclined pipe in an oxygen-depleted environment; through a dense bed delivered into the catalyst regenerator, the mixture contact oxygen-containing gas, and is combusted; charred and regenerated regenerated catalyst is delivered out of the catalyst regenerator through a regeneration inclined pipe, and is recycled in a catalytic cracking reactor; flue gas produced by combustion reaction is delivered through a flue gas discharging device on the top of the regenerator. The invention also provides a catalyst regenerator used for realizing the method. With the method and the regenerator provided by the invention, a phenomenon of local coking after combustion caused by uneven fuel oil sprayed in local places can be avoided. The method and the device can be used in a catalytic cracking process in which a reaction heat demand is high and reaction regeneration system thermal equilibrium cannot be satisfied by regenerator charring heat release.

Description

technical field [0001] The invention relates to a method and equipment for catalytic cracking of hydrocarbon oil in the absence of hydrogen, and more specifically relates to a method and a catalyst regenerator for a catalytic cracking unit to supplement the heat of a reaction regeneration system. Background technique [0002] Fluid catalytic cracking and catalytic cracking are one of the most important secondary processing methods in the field of petroleum refining. With the development of catalytic cracking technology and catalysts, the riser feed of most catalytic cracking units is generally raw material oil such as wax oil mixed with residual oil, atmospheric residual oil or even vacuum residual oil. The coke generation rate in the reactor is relatively high, and the heat released by the regenerator can generally meet the heat balance requirements of the reaction regeneration system, and even the heat is excess, so it is often necessary to adopt various heat extraction me...

AI Technical Summary

Problems solved by technology

The problem with the conventional method of injecting fuel oil into the regenerator is that the injection of fuel oil is uneven, which may easily cause severe overheating of the bed layer, cause the collapse of the molecular sieve structure of the catalyst, and accelerate the damage and deactivation of the catalyst.

[0006] The problem with the above method of supplementing heat for the catalytic cracking unit is that the structure of the catalyst regenerator is complicated, and it is only applicable to the coaxial catalytic cracking unit and the device type using the plug valve to be generated, which has certain limitations in industrial implementation

Images