Issues with catalyst startup conversion agents
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For the startup of heavy oil catalytic cracking (coaxial) – catalyst transfer, fluidization of the two reactors – is there any requirement regarding the temperature increase in the riser? ； When changing the catalyst, does an excessive catalyst circulation rate have an impact on the cyclone separator? ； Why cannot the riser outlet temperature exceed 550℃ ； I hope to receive guidance from all the teachers. Thank you!
Since the reactor materials are mostly carbon steel, they tend to deform at high temperatures
In the anti-reaction system, all the equipment is made of carbon steel; moreover, the reactor also has a lining!
Then why can’t the catalyst circulation rate be too high when the two reactors are in fluidized state?
This post was last edited by Refiner on 2017-9-26 at 14:00. At the start of fluidization, the temperature in the feed line is low, making circulation difficult; a slight amount of material can remain in the stripping section, the shut-off valve should be opened wider, and the circulation rate should not be too high. A large circulation volume will not cause damage to the centrifuge
There are many areas in the reactor that are not lined, such as the grates
At the beginning of the catalyst transfer, the amount should be controlled – only enough catalyst flow is required. Once the temperatures in the lift column, settler, and stripping section have risen, the circulation rate can be increased.