Restart plan after bed blockage in catalytic cracking unit
Thread Content
It is the first time that the catalytic cracking unit undergoes a bed blockage operation; but how can it be restarted after the blockage? Do any of my fellow citizens have any good insights?
Can the bed temperature be maintained above 400°C after sealing the bed? If not, the material must be removed and the process repeated. Also, is there a backup main fan? After starting the main fan and allowing air to enter the regenerator, it’s necessary to maintain a pressure in the settler that is higher than that in the regenerator. Burner oil is then used to control the bed temperature and to fluidize the catalyst; oil is injected once the conditions for injection are met, just as in normal operation.
Your question is too broad. Simply put, the purpose of the bed sealing step is to ensure that fuel can be sprayed for combustion; once the bed sealing is complete, main airflow is introduced to spray the fuel for combustion, thereby raising the temperature and preparing the conditions for fuel spraying!
Thank you for your reply. Last year, we carried out the process of sealing the reactor and then restarting operations; it took about ten days to complete this process. Eventually, it became impossible to maintain the required temperature, so we removed the catalyst and started the process again in two stages by gradually increasing the temperature