For positive-pressure transfer using a cyclone separator, is a ash hopper needed? Without an ash hopper, will dust-containing gas be discharged from the lower part?
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When the fan is located upstream of the cyclone separator, the separator operates under positive pressure; is it then necessary to install an ash hopper or an ash discharge valve? What will happen if no ash hopper or ash discharge valve is installed? What I want is for the large particles to fall out automatically from below the separator (without too much dust-laden gas being discharged there), with the dust-laden gas being expelled through the upper outlet. Is it possible to achieve this? (Because there is a large amount of slag, it wants to be discharged directly onto the ground.)
It is better to locate the fan behind the cyclone; if ash removal is necessary, a backup cyclone can be used in turn for this purpose.
Thank you for your answer! If the fan is located before the cyclone, in that case, the dust-laden gas enters the inlet of the cyclone separator under positive pressure. If there is no ash hopper, what will be discharged from the lower part of the separator – large particles of dust, or a mixed gas containing many fine dust particles?
For me, it isn’t important whether a clean separation can be achieved; what matters is that no large amounts of gas containing fine dust are released from the bottom of the separator, thereby contaminating the working environment. If positive pressure conveying is used and no ash hopper is installed in the separator, the separation efficiency is merely low; some large particles are discharged slowly from the bottom, which does not affect the working environment – this is the best approach. What worries me the most right now is that too much gas containing fine dust particles is discharged from the lower part of the separator, contaminating the working environment. Could you please clarify this? Thank you!
Theoretically, the pressure at the bottom of a cyclone dust collector is low; I don’t have specific data on just how low it is. Under positive pressure, it should be the mixed gas that comes out.
In the case of cyclones, positive pressure conveying, and no ash hopper, is the dust-laden gas discharged from the bottom a serious issue? I’ve seen some information stating that even under positive pressure, a negative pressure is maintained at the axis of the separator, and this negative pressure can extend all the way to the ash hopper. If that’s the case, not too many fine particles will be released from the lower part, thus avoiding impacts on the environment
A ash hopper or ash discharge valve must be installed. With the fan at the front, the air entering the separator is under positive pressure; if the bottom is open, the air will carry large particles of material and dust as it exits from the bottom. Fluids always flow through the exit with the least resistance, and this has been proven in practice.
A ash hopper or isolation valve must be installed; otherwise, the air will escape directly from the bottom