Cyclone separator pressure drop in the settler
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When the sedimentation tank has a high level of material, the pressure drop in the cyclone separator is low; whereas when the sedimentation tank has a low level of material, the pressure drop in the cyclone separator is high. Could experts explain why this is the case?
Could you be more specific about that score selection? How is the pressure drop measured?
Generally speaking, a decrease in the pressure drop of the centrifuge is not a good thing. Does the pressure drop of the centrifuge decrease when the catalyst inventory is high, while at the same time there is an increase in catalyst loss? If the material level is too high, it causes the flap valve to open poorly; in this case, the centrifuge descends, its efficiency decreases, and there is an increase in leakage.
Can a settler have a material level? The level of catalyst in the precipitator is also too high. Inside the reactor, the catalyst does not accumulate against the flap valve.
In some designs, the settleer flap valves are not located inside the bed; naturally, the length of the material legs is greater in such cases.
The pressure drop in a cyclone separator is proportional to the kinetic energy of the incoming gas, that is, proportional to the square of the velocity of the incoming gas. When the reserve in the settler is high, the resistance for the stripping steam to pass through the raw catalyst and enter the cyclone separator increases, the kinetic energy of the stripping steam decreases, and as a result, the pressure drop across the cyclone separator is reduced. The above represent only personal opinions.
Apart from the variation in pressure drop caused by changes in the size of the cyclone itself, there are two factors that determine the cyclone’s pressure drop: 1) the inlet gas velocity of the cyclone. As mentioned earlier, the cyclone’s pressure drop is proportional to the square of the inlet gas velocity; the higher the velocity, the greater the pressure drop. For a given cyclone, the only factor that affects the gas velocity is changes in the volume of gas flowing in； 2. If there is no change in the gas volume, then another factor that could affect the pressure drop in the cyclone needs to be considered: the amount of particles present. Based on our understanding, it would seem that the more particles there are, the greater the pressure drop should be; however, the reality is the opposite – the more particles there are, the lower the pressure drop. As of now, there is no reliable theoretical model that can provide a satisfactory explanation for this phenomenon. But there is one theory that seems plausible, and that is the agglomeration of particles among themselves. Therefore, I believe that when the amount of catalyst present increases, the solid content entering the cyclone also increases, which results in a lower pressure drop in the cyclone, and vice versa.
Could you please share any relevant materials?