Originally Posted by Bolour.Habib

Hello every one,

I am looking for the relation or a clue for the calculation of screening rate of the Roller Screens.

There is machine in Iron direct reduction furnaces called product discharge chamber "PDC".

Metallized material (DRI) will be fed on 3 rollers that have some indentation to break clusters. These rollers have reciprocal rotation (approx 90 deg.). I don't know how to estimate the discharge rate through the slot shape gap between these rollers. I need this to calculate the hydraulic actuator speed which is directly related to the reciprocal rotation speed of rollers.

Would you give me a clue?

Kind regards,

Habib

Hi Habib

With reciprocal rotation is sounds like a kind of a crusher sizer. Try 45 deg opening volume and multiply by number of cycles per hour and that should be something to start with. I would suggest to remove or add 1 roller to create a crusher sizer.

Regards

Ziggy Gregory ■

Habib,

You are trying to lead the horse by its tail. If you start with the pump flowrate this will put you on the right lines. There must be other valving to reverse the actuator direction. Trying to calculate the throughput is a lost cause (if the manufacturer hasn't got a clue, there you are). Vary the hydraulic flow and see what happens.

Your situation is typical, engineers are given the problem without the facilities to do test work which used to be one of the fundamentals of engineering courses. Like they say. "Once you have passed the driving test throw the direction indicator and mirrors away." ■