Re: Fire In Direct Reduced Iron Fines
Dear Mr.Abhishek,
I am not a process engineer. The following are only my opinions.
In the HOT DRI plants, the prevention of re-oxidation is done by making the HOT DRI into briquettes and immediately quenching them. Otherwise there would be chances of re-oxidation, thus catching fire.
In the CDRI plants, a large quantity of inert gas with minimum amount of oxygen is passed, after the reduction zone ( where iron-oxide ore is reduced to iron ).
This makes the CDRI to get cooled and also the CDRI is covered with a layer of oxidation, which prevents further contact of air with the reduced iron.
I think that there could be mismatch of time & inert gas ( + minimum oxygen ) quantity which are essential to make CDRI safer for handling through conveyors, in your plant. Same topic has been discussed earlier also in this forum, in one of which I had also raised similar question. Please check.
Please come back with the solutions , you would be implementing soon and tell us how the problems got solved.
Regards, ■
Re: Fire In Direct Reduced Iron Fines
Originally Posted by sganesh
I am not a process engineer. The following are only my opinions.
In the HOT DRI plants, the prevention of re-oxidation is done by making the HOT DRI into briquettes and immediately quenching them. Otherwise there would be chances of re-oxidation, thus catching fire.
In the CDRI plants, a large quantity of inert gas with minimum amount of oxygen is passed, after the reduction zone ( where iron-oxide ore is reduced to iron ).
This makes the CDRI to get cooled and also the CDRI is covered with a layer of oxidation, which prevents further contact of air with the reduced iron.
I think that there could be mismatch of time & inert gas ( + minimum oxygen ) quantity which are essential to make CDRI safer for handling through conveyors, in your plant. Same topic has been discussed earlier also in this forum, in one of which I had also raised similar question. Please check.
Please come back with the solutions , you would be implementing soon and tell us how the problems got solved.
Regards,
Dear Mr. Sirdharam,
Sorry for replying so late and thanks for your suggestions. But the problem still persists. Actually when we are using other raw material, except the one which we are producing in house, there are no incidences of hot fines or fire. But when we are using our in house built pellets, the fines become hot and fires arise especially in the product dust collection systems. So this justifies the fact the furnace and the cooling zone (which we are using to cool our final product with cooling gas(inert gas)) is working normally. But still we are not able to identify the exact problem yet with our in house produced raw material. As I already have mentioned most of the parameters of our in house pellets like linder test results, Fe percentage, carbon percentage and CCS fall within normal range as do for other pellets.
Are we skipping or can we test some other properties of the pellets which are making the fines of the produced product catching fire.
Thanks and Regards,
Abhishek ■
Fire in Direct Reduced Iron Fines
Dear All,
We have a Midrex Sponge Iron plant producing cold DRI. Since some days we are noticing fire in DRI dust. The temperature stays normal at the furnace discharge but when the product gets transferred after moving through a belt for around 200 meters to another belt the DRI dust catches fire. It is happening again and again. We have started using some new pellets since some days but most of its parameters like Fe percentage, carbon percentage and CCS fall within normal range as do for other pellets. Can someone please advice me what could be the cause behind these fires.
Thanks,
Abhishek ■