Is spray combustion oil used to control the temperature when shutting down the catalytic unit to remove the catalyst?
Thread Content
Is spray combustion oil used to control the temperature during catalyst removal when the catalytic unit is shut down? Spray combustion oil helps maintain the temperature, making it easier to remove the catalyst; if the catalyst removal process takes a long time and the temperature drops, it becomes more difficult to remove the catalyst. What are everyone’s thoughts on this issue? Should burning oil be sprayed whenever catalysts are removed from various catalytic units during shutdown? Discussion is welcome.
In principle, it’s not necessary, but if the bed is too low, spraying can be considered; however, the spraying time should not be long
The equipment here has never used fuel injection for descaling during shutdowns; the descaling process is carried out in the same way. I would like to ask what the reason is for the good solvency of the fuel injector cleaner
Generally, after shutdown and corresponding adjustments, there is insufficient raw coke, the bed temperature is low, the catalyst circulation rate increases, and the pressure drop across the slide valve decreases; in such cases, it is possible to consider injecting combustion oil to raise the bed temperature； Furthermore, a higher temperature across the entire bed of the regenerator also facilitates coking, which helps to restore catalyst activity. When feeding the material for the final cut, in order to ensure good charring of both reactors and to prepare for the next operation, it is possible to spray some burning oil; generally, this poses no problem
The method is correct, and the concept is great too! But there are many other ways to control the regeneration temperature; when the load decreases, both the internal and external extraction processes should also have their load reduced! Moreover, this degree of charring has an negligible impact on subsequent operation; a balancing agent is used to replenish the system’s inventory each time it is started up, which shows that there is no need for the catalyst to have extremely high activity
Bro, you’re right – when we stop operation for external heat extraction, we do turn off everything related to it, but internal heat extraction remains active. Generally, no plant shuts down that function, after all, the superheated steam goes to the reactor; if the temperature is too low, it’s counterproductive. The goal in operating these two systems is stability, right? We try to use as few means as possible to keep production running smoothly
Yes! Actually, when I was drafting the response, I also took into account that there are differences among each device! Just because I don’t use it doesn’t mean others don’t! Your approach is correct: use as few means as possible to achieve the result! Simple and brutal!
We don’t spray either, but we need to keep the bed temperature under control; it can’t be too low
What is the processing capacity of your equipment? With burning oil injection, the catalyst temperature is high, making it easier to remove the catalyst and speeding up the removal process.