Catalytic cracking unit balancer
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The fine powder content of the balance agent in the system is slightly high; what are the reasons for this? What measures should be taken?
This post was last edited by Refiner on 2019-7-27 at 10:08. It is mainly caused by catalyst wear; steam containing water or low temperatures can also lead to thermal degradation of the catalyst, resulting in the formation of fine particles. The amount of these fine particles plays a crucial role in the fluidization of the catalyst, so it is necessary to maintain a certain level of such particles.
Currently, the content of fine powder is much higher than before
This post was last edited by dtxqdawei on 2019-7-27 at 16:06. From our experience with such devices, it is not good if the content of fine particles in the balancing agent is too high or too low; we generally keep the proportion of fine particles with a size of 0.40 um between 15% and 18%. There are many reasons for a high level of fine particles in the balancing agent – for example, insufficient strength of the catalyst； Catalysts of different strengths are used in combination ； The nozzle linear speed is too high ； Leakage of some regenerated steam caused a thermal runaway ； The regeneration temperature is too high (above 720 degrees), resulting in poor fluidization during regeneration; this leads to large radial temperature differences and localized high temperatures ； Insufficient amount of regenerant circulation, long residence time, etc. Appropriate countermeasures should be taken for the above reasons: adjust the operating parameters while replacing the catalyst; no further measures need to be listed!