Catalyze emergency shutdown
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The last edit to this post was made by Refiner on 2018-8-4 at 16:45. If the boiler steam is interrupted during the startup of the catalytic unit and cannot be supplied for an extended period, is it possible to fluidize only the regenerator while using internal circulation to supply oil to the distillation tower?
What is used to maintain the reaction pressure?
Regenerator single-unit fluidization? Is it a stuffy bed? What stage has the construction reached?
Since it’s already in a fluid state, why can’t burning oil be injected? Why not activate the external heat exchanger in the regenerator to generate steam and maintain steam pressure? Use the external heat exchanger as a substitute for the boiler for now
It has started up; the steam is gone. Can the regenerator be operated in single-flow mode, with the feed oil circulating within the make-up tower, until the boiler is restored to normal operation?
What is causing the boiler to not produce steam? No water or no heat source?
Since the internal circulation in the tower has been changed, the large blind flange must have been removed. This condition cannot be maintained for long; without steam, it’s impossible to control the reaction pressure. As a conservative measure, one could reinsert the large blind flange to revert to the previous setup, or else burn fuel in the regenerator to generate steam. I’m not sure whether you use diesel or wax oil for this purpose, but regardless of what is used, the design ensures that enough steam is produced for internal use. This requires a leader who truly understands the equipment and has a sense of responsibility to make the decision.
Even if it’s not enough, the pipeline network can still maintain the pressure in the medium-pressure system! What do you think?
Yes, the key issue is that the questioner didn’t make it clear whether it refers to the boiler used to start up the process itself, or the CFB system for the entire plant. Nowadays, new plants all use CFB technology; it’s impossible to completely stop the use of steam. As for old plants, if they use catalytic methods to start up their boilers, then the scale of those plants isn’t very large, and injecting oil to generate steam is sufficient for their needs.
Diesel is used to maintain the temperature of the regenerator, while the steam generated by the auxiliary boiler is used for distillation and reactions; I think this should work