after checking & doing everything with respet to reduction of DP of my coal mill filter i am unable to reduce the DP.
with new bags it runs for 20-25 days only & than Dp touches 150mmwg & coal mill production reduces.
I have 6ksc dry air pressure, high purging frequency,no jamming,no pipes loose or worn out,periodic drain of moisture, low air to cloth ratioo (~ 1).
Before bag filter i have a collecting cyclone.
to increase air amount in the system i have shortened the dip tube by 300mm . now the dip tube is just 80-90mm below the inlet entry height.
when we replace some bags by new one we get a relief on temporary basis but agter some days the position is same.
please suggest.
Coal residue is 4 to 6 % on 72 mesh
we sre grinding petrocoke + indian coal (80+20% mix.)
we have close circuit ball mill of FLS
please do suggest.
rajesh