Coal mill filter bag chokingup contineously and DP on higher side

Dear Sir,
Our coal mill filter bag is choking up frequently, brief details of the problem as below.
Since from one week our coal mill filter bags DP going very high and reduced suction from mill, when we checked the process we are not finding any problem,we are using south african coal and charcoal in the ratio 1:1, (South african coal ash 14 to 18% and VM 23 to 25 and char coal ash 35 to 40 and VM 1 to 3%) since one year we are using same and not faced any problem, the same combition is working fine with our kiln, for trial when we ground only indian coal with ash 30% and VM 28%, the filter bag DP normal, kindly advise us what could be the problem. Regards, Ramesh Aital  

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