Originally Posted by mehdiohadi

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Hi

In one of our pellettizing plant we will have EP collector, i would like to have your technical comments about discharge method:

1- use pneumatic conveyor - intermittent

when the material in EP hopper achieve to specific level, the material discharge to pneumatic conveyor, in this way the pneumatic conveyor works intermittent and i think we have less wearing in conveyor but maybe the efficiency of EP decrease.

2- use pneumatic conveyor - continuously

we discharge the material to the pneumatic conveyor continuously

Yours Sincerely

Mehdi Ohadi

Dear Mr. Mehdi Ohadi,

The answer depends mainly on the collected dust itself. If your dust is not too fine, contains no or less moisture, is free flowing (without aeration) and the collecting-hoppers beneath the ESP are proper designed (steep angle, outlet-diameter 300 mm or more) , you should be able to discharge your EP on an intermittent base.

But if you are not shure about the properties of your dust (or you know, that the material is sticky, wet and/or not free flowing), please run your pneumatic conveyors continously! I have attached a typical flowsheet for a (bigger) powerplant-ESP.

With continously conveying you would not have any trouble with caking, clogging around your ESP. If you collect the dust by airslides, power consumption and wear becomes also very low.

If you have more detailed questions, pls. feel free to contact me. We have a lot of experiences with deashing and are able to support you.

Best regards

Klaus Schneider

KS-Engineering Gmbh,

Cologne, Germany

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Originally Posted by mehdiohadi

Hi

In one of our pellettizing plant we will have EP collector, i would like to have your technical comments about discharge method:

1- use pneumatic conveyor - intermittent

when the material in EP hopper achieve to specific level, the material discharge to pneumatic conveyor, in this way the pneumatic conveyor works intermittent and i think we have less wearing in conveyor but maybe the efficiency of EP decrease.

2- use pneumatic conveyor - continuously

we discharge the material to the pneumatic conveyor continuously

Yours Sincerely

Mehdi Ohadi

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Dear Mr. Ohadi,

From strictly pneumatic conveying technology viewpoint, you can use either continuous or intermittent, both are acceptable. But there will be differences in the process design of these two systems.

Because of the downtime, the intermittent system will require a higher conveying capacity for the conveying system that will result in larger equipment sizes. The resulting regular starting and stopping of electric motors will also cause more wear and tear of their components. You also will need more instrumentation to interlock the high and low level switches in the dust collector hopper with its discharge rotary valve.

For these reasons, a continuous system will be better.

Regards,

Amrit Agarwal

Pneumatic Conveying Consulting

Email: polypcc@aol.com ■