Regeneration technique for fumes and gas flue in imperfect combustion

Abstract

A technique for burning the fume not regenerate fully in flue features that the air is filled in the flue at proper position for burning part of CO and hydrocarbon carried by Co, and a self-protecting interlocking system is arranged to prevent the overheat and tail combustion of final fume.

Description

technical field [0001] The invention relates to catalytic cracking technology, in particular to flue gas energy recovery technology of catalytic cracking. Background technique [0002] Catalytic cracking catalyst regeneration is to pass air into the regenerator to burn the coke attached to the catalyst from the reactor, so as to restore the activity of the catalyst for recycling. Catalyst regeneration is divided into complete regeneration and incomplete regeneration. Complete regeneration means that all the carbon in the coke is fully burned into CO in the case of peroxygen. 2 ; Incomplete regeneration means that the carbon in the coke is not fully burned, and the flue gas after combustion contains CO. [0003] For incomplete regeneration, it mainly includes the following three situations: [0004] 1. Parallel two-stage regeneration, the setting of the parallel two-stage regeneration flue gas system is divided into the following four types. [0005] 1) Set the secondary f...

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Problems solved by technology

[0012] Moreover, for the type 2) parallel two-stage flue gas regeneration system, the temperature of the mixed flue gas and secondary flue gas is below 550°C, so the temperature of the flue gas at the entrance of the hood is lower, so that the hood can recover The power of the flue gas pressure energy and the efficiency of the smoke machine are lower

For the type 3) side-by-side two-stage regeneration flue gas system, because the secondary flue gas does not enter the smoke machine, a large amount of flue gas pressure energy cannot be recovered, which increases the energy consumption of the device

For the type 4) parallel two-stage regenerative flue gas system, although it alleviates the problem of low flue gas temperature at the entrance of the smoke machine, this kind of scheme requires large investment and complicated control

[0013] In addition, for the single-stage incomplete regeneration, there are not only the problems of low power to recover the pressure energy of the flue gas and low efficiency of the flue gas due to the low temperature of the flue gas at the inlet of the flue gas, but also the hydrocarbons contained in the flue gas Afterwards, it is easy to adhere to the catalyst under the blades of the hood and cause fouling, which will destroy the balance of the hood and cause the vibration of the hood to exceed the standard, thereby affecting the long-term operation of the hood

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