re Drop of kiln feed rate

Dear BLM,

Can you please inform what is the method you are following for chemical analysis?

Is there any change in the method?

If It is by X-ray, is drift updated at recommended intervals?

Is there any X-Ray tube repalcement? 

Is there any AMC Service by the OEM?

How you are calibrating your X-Ray machine for Kiln feed program?

Please check all these and you may get the root cause for this problem.

Best of luck.

 

Reply

Know the answer to this question? Join the community and register for a free guest account to post a reply.

re Drop of kiln feed rate

Dear BLM

In addition to the Ted's findings you can also verify quartz ( 45 micron) and calcite (120 micron) presence in your limestone.

If mining is done from different sources or benches in same mine then there may be changces of presence of quartz and calcite which affect burnability of raw mix. 

Burnability study of raw mix can predict the burning behavior of raw mix.

Change in fuel, specially high S presence, tentatively 1.5% S in average fuel in your case.

Also check the burner position and parameters which some times contributes to this types of situation.

Please let us know your feedback.

Regards

 

 

 

Reply

re Drop of kiln feed rate

Dear All,

I would like te express my thanks to all of you for sharing your valuable experiences. Increasing of AM ratio can increase the nodulation in turn reduce the dusty  condition, but we are producing SRPC, where C3A content is maintained less than 5 % and AM is around 0.7 %. If AM is the isssue we are comfortable in SRPC production. 

In a day all of a sudden the nox increases from 350 to 900 ppm and zone looks very brigt and kiln accepts feed rate jumps from 270 to 310 TPH this condition is maintained for max. 3 hous only. During this condition we analysed kiln feed chemical composition and noticed no change.

We have advanced robotic laboratory with Panalytical XRF with Axios software and also we have XRD. We are using standard raw meal samples for XRF programming, which are analysed at Geramany.

We observed irregular flame shape at tip of the burner and suspecting that coal path tube may dammaged. But what extent it can contribute to fall in feed rate is again a big question.

We are using 30 % South African coal, 30 % Indonesian coal (lignite) and 40 % Indian coal (bituminus). As far as my knowledge is concerned we does not have alkalies problem. As one of our expert says, major part of SO3 contribution is from fuel only.

If free silica is present, it will leads to increase free CaO but we does not have such kind of problem.

Please share your expieriences to sort out the problems............

Regards,

BLM

 

Reply

re Drop of kiln feed rate

Hey;

I don't know why do everybod here think it is material problem and solving the problem will be through adjusting it!

As free lime and literweight is (more than) normal, NOx drops from 500 ppm to 300 ppm, no alkali or sulfur problem, and "running this kiln 3 years with the same materials without any problem" ....

It seems to me that there is another problem, and i think this problem has a relation with material lifting in preheater or air flow. Let me know BLM; do you have any problem in material lifting or material sliding? do you have any problem in cyclones flapes or cyclone-5 diverting gate (if you have)?!! Do you have any variation in cyclone 5 or 6 gas temperatures? do you have CO in the system? what about O2? and finally DO YOU HAVE ANY PROBLEM IN PREHEATER REFRACTORY LINING ESPECIALLY SMOKE BOX & RIZER DUCT?

Best Regards

Nael

 

Reply