Re: Cement mill performance drop when use clinker with petcoke firing

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Depending on the general process, kiln and burner layout the sintering process is very sensitive to flame changes. In some plants very small changes in the flame diameter have radical effects to the clinker quality. Those plants report the following:

• The clinker burning takes place at different positions in the kiln – therefore the classic sintering zone pyrometer is only of small use in kilns with a high rate of alternative fuels.
• Long term analysis proved that the ignition point is not as important as commonly expected for the clinker quality
• Smallest changes – even only short termed – in flame diameter have a larger impact on clinker quality as formerly thought.

Conclusion: Changes on ignition point and thus movements of the sintering zone have been overrated. Changes in flame diameter have more impact on the product quality than changes of the flame ignition point.

The Side View Thermography became a great help in determining the impact of fuels on the flame and thus on the product quality. You would have to use an instrument to analyse the temperature of the burning zone and you could adjust your burner accordingly. You as well could use a calculation tool to give you online information about the burning degree.

Instrument: http://www.powitec.de/Downloads/Cement/Powitec_WorldCement_2010_08_SwitchingToSideView.pdf 

Movie about the front thermography

Movie about the side thermography (side view installation especially for the combustion of various waste fuels at the main burner)

Example of online-prediction of FCaO

Or drop me a mail a.hanf@powitec.de and I will send you some information.

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