Reaction system bed holding time

Catalytic cracking: I forgot the temperature at which combustion oil is injected – it’s between 380 and 430 degrees. A higher temperature is better, but there aren’t many measures that can be taken. Since the bed is blocked, there’s not much that can be done either. Of course, things like external heat extraction and internal heat extraction need to be stopped, as well as the use of lubricants; similar actions apply. I also forgot the exact time required. In fact, it depends on the specific circumstances. Knowing the maximum time isn’t very useful. You can start the process when conditions permit, and you can’t start it when they don’t. It also depends on what happens after the main air is introduced, such as whether there’s any leakage or if there’s uneven flow within the bed layer. Of course, it’s also important to check whether the bed temperature is suitable for injecting oil. If the conditions are right, then oil is injected; if not, then the furnace needs to be started. Typing this is tough; please don’t criticize if you don’t like it

Based on empirical data, leaving the bed idle for 2 days should not pose too many problems. Simply stop supplying the medium in question; the catalyst that is in the regenerator and transferred to the balance tank will not cool down even over several days if no cooling medium is used, as there is no insulation in place

Based on my experience with bed sealing, it is generally necessary to remove the agent after three days. The auxiliary combustion chamber has been activated again; it is recommended that the core temperature within the catalyst in the regenerative bed be kept above 380 degrees within 48 hours.

Generally, it should be fine within two days, provided that all air and steam supply to the various instruments is shut off and air intake to the two devices is prevented

It depends on the specific device; the longest duration I’ve seen is a week of keeping it sealed