Catalytic cracking unit shut down for maintenance; reverse and regenerative catalysts replaced.
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Dear experts in the marine field, after the catalytic reaction is stopped, how does the catalyst in the settler move to the regenerator?
Open the valve and lower it; if necessary, increase the pressure in the settler to push it down
At least 2-3 hours. After burning is complete.
Didn’t understand the meaning? Could you explain it in more detail?
After stopping the feed, keep the reaction pressure higher than the regeneration pressure; increase the steam supply in the reactor and reduce the heat taken away by the regenerator to enhance coking intensity. The operator takes samples at the catalyst sampling point for analysis – a white color is generally sufficient. As for how long this should take, it’s hard to give a definite answer; usually, 2 hours is enough
Reduce the regeneration slide valve and increase the standby regeneration slide valve; once both the density and pressure drop inside the inclined tube have decreased, adjust the opening of the slide valves repeatedly to ensure that all the catalyst in the reactor is transferred to the regenerator