How to determine the amount of charring caused by first and second re-burning
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As the title suggests, in a catalytic cracking unit with two stages of oxygen-poor regeneration, what is a more intuitive way to determine the amount of coking that occurs in the first regeneration stage and the second regeneration stage?
I feel that a comprehensive judgment can be made by considering the reserve amount, the main air ratio, and the sampling of flue gas from stages one, two, and three
Isn’t there a formula for calculating the amount of burning? It’s quite simple to calculate
The operating parameters are easy to observe. 1. If the temperature in the primary phase is low, the temperature in the secondary dense-phase bed is high, and the carbon monoxide content in the flue gas is high, it indicates that a large amount of coking occurs on the catalyst, or that the main air flow rate in the primary stage is low; as a result, less coking takes place in the secondary stage while more coking occurs in the tertiary stage. It is necessary to adjust the feed ratio or the air distribution among the primary, secondary, and tertiary stages in order to regulate the coking load in these stages. 2. If the temperature in the secondary phase is consistently high and the carbon monoxide content in the flue gas is low, while the temperature in the secondary dense-phase bed is low, it indicates that either the main air flow rate is too high or the amount of coking on the catalyst is insufficient; furthermore, if the amount of coking is too low, there isn’t enough heat, and it is necessary to increase the amount of material mixed in or reduce the main air flow rate in order to adjust the coking balance.