HIGH RESIDUE OF PETCOKE IN PRODUCT

DAER ALL

I AM FACING A PROBLEM OF VERY HIGH RESIDUE ON 90 MIC. IN PETCOKE GRINDING VRM IN PRODUCT. IT HAS INCREASED FROM 4% TO 12% OR MORE.

I HAVE CHECKED THE SEPARATOR INTERNALS WHICH IS OUTSIDE THE MILL.

MILL INTERNALS ARE ALSO CHECKED BUT FOUND NO PROBLEM.

ROLLER TENSION IS MAXIMUM [ SPRING LOADED TENSION ON ROLLERS ]

OPERATING PARAMETERS OF  FAN SPEED, MILL LOAD, SEPARATOR RPM & LOAD ETC. ARE NORMAL.

TRIED BY CLOSING THE SEPARATOR VAINS BUT NO RESULT.

PLEASE DO ADVISE

ENGR

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re HIGH RESIDUE OF PETCOKE IN PRODUCT

Pl check your pet coke HGI &VM 

 

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re HIGH RESIDUE OF PETCOKE IN PRODUCT

I have checked , another mill of same dimentions & capacity is running well with less than 4% retn. on 90 mic. Checked sepr . ok . Should I doubt about the grinding effeciency of mill. The operating parameters of mill like  mill load, DP, fan load etc. are not reflecting any change. Sepr. static vanes gap reduced to minimum but very high vibn. with high residue etc.

How can I check whether the separator is faulty or the mill?

Pl. suggest

 

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