We operate two fine coal bin of cap. 200 tons each. Due to coal fluctuation we have provided compressed air at 2kg pressure but due to this sometimes we are having problem of fire and sintered formation in bin. We have already tried blower air but with this coal fluctuation problem. Can you suggest an alternate way to avoid this problem.

I would not use air or gas of any kind to agitate the coal in the fine coalbins. I suggest using acoustic cleaners and sounding these at regular intervals to prevent bridging in the bins.

We are manufacturing white cement and facing problem of lump formation as well as coating on the wall of cement silo. We are keeping the temp of cement at inlet of silo at approx 80 degree and have installed a bag filter which runs round the clock to extract moisture from cement. Please suggest how to get rid of the problem and also that wather we can go for a Polymer liner or any other insulating paint to fix on the silo wall to prevent coatings.

At 80 degrees C the cement is still hot enough for dehydration of the gypsum to continue in the silo. You need to cool the cement to less than 70 degrees if you are to be sure to prevent this. The other approach is to ensure that the gypsum dehydration takes place in the cement mill by lifting the mill exit temperature to 115 degrees.