How to grind pet coke in vertical roller mill designed for normal coal

dear experts,

we are having loshe mill LM26-3 for coal grinding, now we want to grind pet coke from this mill with a residue of 2% at 90 mic mesh. what changes we have to do or is it possible to reduce the table speed and get the desired fineness and what is the optimum speed pl. write

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re How to grind pet coke in vertical roller mill designed for normal coal

Dear 

         There is no problem to grind  pet coke in LM . If you send me your operating data and design data like fan flow, nozzle area, mill o/l operating temp , dp , HGI of pet coke and grinding pressure with N2 pressure in accumulaor .

    Speed reduction of table can not improve grinding( holding good bed layer of pet coke). better reduced the nozzle velocity of gas with reduction of op. o/l temp around 75 oC and reduced operating dp. set point 20% present with reduced op. grinding pressure 10 %.

 GK SHARMA

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