28 posts
TimePosted 15/10/2008 06:44:50
Saprina says

Good mornig everyone,

Why the thermal load is very important in kiln operation? what is the maximum thermal load? and how can we measure it?

saprina

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312 posts
TimePosted 15/10/2008 08:51:54

Hi Saprina,

Thermal load is important because the refractory lining in the cement kiln can only withstand a certain thermal load and give extended service. If the thermal load is too high then refractory wear will be high and frequent refractory lining failures will occur. The critical point is the burning zone of the kiln where the temperatures and thermal load are highest. In long wet or high capacity preheater kilns this can exceed 25 GJ per hour per metre squared (GJ/hm2). To measure thermal load you must calculate the thermal input to the kiln through the main burner in GJ per hour. Then calculate the cross-sectional area of the kiln inside the refractory lining. Divide one by the other and you have the thermal load.

Thanks

Dr Michael Clark

28 posts
TimePosted 29/10/2008 11:06:38
Saprina says

Hey;

Thanks alot Dr. Clark for your answer but i don't know how to calculate the thermal input to the kiln through the main burner in GJ per hour!!!

Saprina

29 posts
TimePosted 29/10/2008 17:01:11
vinayak says

Hi

You may multiply the fuel feed by CV For ex

Kiln fuel feed rate  = 6000 kgs/hr

C.V                     = 6500 Kcals*4.184 = 27196 Kj/Kg of coal

Thermal Input       = 6000 X 27196 KJs/Hr

= 163.176 GJs/Hr

Kiln dia (inside Lining) = 3.6 m

C.S Area             = (3.14/4)*3.6*3.6

=10.17 m2

Thermal load on kiln = 163.176/10.18

=16.04 Gj/hr.m2

Regards

Vinayak