After the slurry pump was switched, the dust concentration at the flue gas fan inlet increased
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Does this kind of situation occur in your factory as well? After the slurry pump is switched over, the dust concentration at the inlet of the flue gas fan increases – from 110 to 180 – and then it gradually decreases. This happens every time. Please analyze what could be the reason for this.
Is your slurry going into the lift pipe as a feedstock? Unless this affects the reaction position.
Reprocessing of slurry oil should cause this situation. If the slurry oil does not enter the reaction system, then check the impact of pump switching on the pressure in the distillation tower; if there is no impact, then consider whether the high current generated during pump switching is affecting the online particulate monitor :)
It is likely caused by the reprocessing of the slurry; the solid content of the slurry increases after the standby pump is started. The fine particle content of the catalyst settled in the slurry standby pump was stirred up.
Logically, such a situation should not occur; even in the case of reprocessing the slurry, the amount that is sent back to the lift pipe remains very small compared to the amount of catalyst that is recycled
High dust volume – reduced efficiency of the centrifuge – changes in the particle size of the regenerant and in the amount of residue carbon – changes in the amount of oil slurry pumped back, changes in the amount of coke formed, and impact on the fluidization of the catalyst?
We’re just guessing too; it might be related to the reprocessing of slurry oil. But how much catalyst can there be accumulated at the inlet of the slurry oil pump? Relative to the catalytic amount of the two agents. And what is the difference between the catalyst deposited at the inlet of the slurry pump and the catalyst in those two reactors? They’re all the same. They’re all the same; how can this lead to a change in the dust concentration at the inlet of the exhaust fan? If it happened just once, it wouldn’t be a problem, but the thing is it happens every time.
The catalyst deposited in the slurry pump is fine powder that cannot be separated by the centrifuge; of course, it is different from the catalyst in those two devices.
If all other conditions remain the same, check if there is a large fluctuation when cutting the slurry pump!
It is personally believed that the effect of pump cutting on the pressure in the fractionation tower leads to fluctuations in the pressure at the compressor inlet; these fluctuations in turn cause variations in the reaction pressure, resulting in fluctuations in the pressure difference between the two vessels. This, in its turn, causes fluctuations in the regeneration pressure, which leads to abnormal catalyst fluidization and changes in the concentration at the inlet of the flue gas engine!
This situation will not occur unless the slurry pump is switched improperly, causing severe fluctuations in the slurry circulation rate.