Catalyst charring
Thread Content
Why does the regeneration system become unstable when the carbon content of the catalyst is below 3%? Why does it char when the carbon content is between 4 and 6?
It was designed according to this standard originally; of course, problems will arise if it falls below this standard
If the carbon content is low, the bed temperature cannot be raised; once it cannot be raised, there will be problems with catalyst circulation. Therefore, it is necessary to increase the carbon content before proceeding with the combustion process. This is also a characteristic of wax oil cracking. However, the parameters of the existing design are supposed to be based on the properties of the raw material, so such a situation should not occur – simply adjusting according to the design parameters will suffice
The 5th floor is the correct choice: too low a carbon content results in insufficient burning and too little heat; the bed temperature is not high enough to ensure a proper burning rate, and the carbon cannot be burned completely. Additionally, too low an air supply makes it difficult to control the oxygen level, which can easily lead to shutdown due to excessive heat.
I don’t quite understand why a failure to increase the temperature can have an impact on the catalyst cycle If the carbon content is low, can’t oxygen be injected to cause charring as well?
The amount of charring varies, which results in different amounts of heat generated and thus a different circulation rate of the catalyst
The 6th floor is correct; when the carbon content in the catalyst is low, the temperature rise due to coking is minimal. At the same inlet temperature for coking, the temperature of the coking bed is very low, resulting in poor coking efficiency. Moreover, the oxygen consumption is too low, making it difficult to control the oxygen level in the bed. If the oxygen content in the coking bed is too high, it can also lead to overheating.