dear all
we have a tube mill , two chamber , 30 tph OPC , in open circuit.
The mill ventilation is with a bag filter & than a fan.
the diffrential pressure of bag filter is only 10mmwc & the fan load is only 0.6 kw.
the mill discharge cement temp. is 125 deg., gas temp. is 115 deg. while the bag filter outlet temp. is 85 deg.
We have a problem that the steam condenses & drops at the inlet of the vent fan & some vapor also drops from the fan outlet stack continously.
Now If I increase the vent fan speed , my product blaine reduces a lot.
water spray in the II chamber is also not high as we are maintaining cement temp. high upto 125 deg. to reduce water spray.
what is the way to avoid this steam condensation & dropping of water without decrease in output, fan load & cement temp.
The false air or leakage is not much at all. Bag filter & mill outlet duct to bag filter are insulated.
What I am thinking is put some small media in II chamber to increase fineness & than increase the vent volume to compensate for the output & quality . But in that case I will have to increase the water spray which may choke the diaphragm etc. It will also increase my fan power.
Also I can reduce the compressed air purging in the bag filter but it will later on increase the DP & fan speed .
Yes the velocity through mill is very lesds ( less than 0.5 m/s) which is abnormal.
So please suggest.
ENGR