Why does secondary combustion occur? How to prevent and deal with it? ;
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Why does secondary combustion occur? How to prevent and deal with it?
The reason for secondary combustion is the presence of excess oxygen combined with an excess amount of CO. Complete regeneration generally does not occur, as there is already an excess of oxygen. It is more likely to happen at the beginning of operation, when there is no feed to the lift pipe or just after feeding starts. Prevention and treatment methods include adding CO as a combustion aid, reducing the main air flow rate, and increasing the feed volume
During the regeneration process, the distribution of the main air flow is uneven and its volume is low; the CO generated by combustion undergoes spontaneous combustion when it comes into contact with the olefin phase and excess oxygen. 1 Increase the capacity of the regenerator appropriately. 2 Control the volume of the main air flow properly, keeping the oxygen content in the flue gas at 2–3%. 3 Use CO as a combustion aid
The reason for secondary combustion is the occurrence of excess oxygen encountering excess CO