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Technical Cement Forum / Reasons for drop in Kiln inlet temperature

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Ramesh Aital 08/03/2015 05:57:27

Reasons for drop in Kiln inlet temperature

Please any body suggest what would be the possible reason for drop in kiln inlet temp, we have rotary kiln of 3.0 x 42.5m length, with suspension preheater with secondary firing system, all temp profiles including preheater are normal only the kiln inlet temp we are getting around 820 to 840 Deg C, which is almost equal to Cyclone No.5 gas temp, this is happening since from one month, earlier we were getting around 950 to 1000 deg C at kiln inlet, we have checked all Cy dip tubes, dispersion plates etc, we are not finding any problem, calcination also drop down, please suggest the possible reasons for the same.

Thank You,

Ramesh Aital

gks 10/03/2015 14:44:00

Dear

Kiln inlet temp drop due to following reason

1. Heavy coating at kiln inlet - check temp. profile in kiln calcination zone ( kiln inlet to 10. mtr )

2. Can having co formation at kiln inlet .- To avoid co formation for it.

PL send your sreen shot of kiln and calciner on same time on forum.

Thank for sharing your problem

GKS

Ramesh Aital 11/04/2015 07:19:05

Dear Sir,

We have checked inlet oxygen and Co%, oxygen is around 3.0% and Co is 0.03%, the calcination zone area is clean and there is no coating, we have checked shell temp profile, it has been observed that on an average there is 100 Deg drop in shell temp, our burning zone length became short, this problem happened just 4 days after burner pipe replacement, burner is conventional burner and we don't have precalciner in the system, we are not clear about what coarse of action to be taken, kindly help in this regards.

gks 12/04/2015 09:11:18

Hello R. Aital

Have you change in flame formation pattern by changing primary air flow ( which is indicate by your pressure in radial and axial flow). and any change in hood draft control.

If preheater fan flow is less and cooler vent flow is high than say burning zone become short and all zone shifting toward kiln hood . Which indicat by cooler vent temp. , high clinker temp and flame become short and wide and kiln inlet temp less.

How you say that burning zone short

With regards

Gks

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