BLM
27 posts
TimePosted 27/12/2012 13:09:52
BLM says

PH temp. profile

Dear all,

We are hving six stage pre-heater with a capacity of 5000 TPD. Four months back bottom (6th) cyclone immersion tube was damaged so, we are operated the kiln without immersion tube and not faced any operational problem. But 10 days back we lost our 4th cyclone immersion tube, to procure the same we need atleast 30 days so mean while we are operating the kiln without immersion tube in 4th and 6th cyclone.

We are facing lot of operational problems, basically PC temperature is suiting up to  plus 1060 deg. C and 6th cyclone (bottom most) meal temperature not yet comming more than 840 deg. C some times it is droppin to 820 deg.C also. same time we observed that kiln inlet temperature increasing drastically, but kiln inlet nox is not crossing 400 ppm instead of 600 to 800 ppm. with this PH temp profile we are operating the kiln with 240 to 250 feedrate instead of 340 to 350 tph.

My querry is what could be the technical reason for improper temperature profile arcoss PH. Is it because of not having immersion tubes are any other reason.

Reply in this regard is highly helpfull for me.

Thaks in advance.

 

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lalbatros
138 posts
TimePosted 03/01/2013 07:41:33
lalbatros says

re PH temp. profile

I suggest you perform gas and solids temperature measurements across these cyclones and report them here. High differences between gas and solid outlet temperatures could be a clue.

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GSMS
19 posts
TimePosted 18/01/2013 15:26:50
GSMS says

re PH temp. profile

You noted that your fourth cyclone dip tube also damaged. Whether the damage is full? All dip tubes removed? Have you checked inside the cyclone?

Before starting check all the cyclones. Cyclone cone may be partially blocked with parts of damaged dip tube. That may be the reason for sudden change in temperature profile and operation with less production. Check all cyclone cone meal chutes for proper flow of material.

Do u have CO analyser at calciner outlet and preheater outlet? If the CO levels are in higher side stop the plant and check the fourth cyclone thoroughly.

Best of luck.

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BLM
27 posts
TimePosted 04/02/2013 11:35:30
BLM says

re PH temp. profile

Sir,

Thank you very much for your suggetion. as you said we found part of the dip tube at fourth cyclone cone area.

Regards,

BLM

 

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