Product category:
Energy management; Boiler control
News Release from: Cinar | Subject: Waste tyres in Calciner
Edited by the Processingtalk Editorial
Team on 23 October 2007
Waste tyres in Polysius Calciner
increased to 60%
Cinar mathematical modelling suggested site amendments to the waste tyre injection points on a cement plant Polysius pre-calciner, which led to the waste tyre loading being considerably increased
A coal-fired Polysius pre-calciner had been modified to co-fire waste tyre and wood chips with coal in order to reduce the fuel costs, at a cement manufacturing plant Plant engineers had been particularly interested to find out if the tyres would burn within the upward flow of kiln gases and rise against the hot material or eventually descend semi-burned into the riser throat
This article was originally published on Processingtalk on 17 Oct 2007 at 8.00am (UK)
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They were also interested in the resulting thermal profile in the pre-calciner riser duct with the introduction of tyre chips.
There was also a concern over a possible build-up problem between the riser and the kiln due to the fall out of larger tyre chip particles and over the most appropriate tyre-chips injection locations and particle size distribution.
The Cinar mathematical consultancy study on this project started with the data collection campaign, which was required to establish the pre-calciner model inputs.
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The project then involved simulation of the pre-calciner for a number of waste tyre chip injection locations, particle sizes, riser duct velocity variations and thermal load of tyre chips.
The resulting Cinar recommendations included the incorporation of a refractory cast restriction platform into the riser duct in order to enhance the velocity of the kiln gases so that all the tyre chip particles may be fluidised and refrain from dropping down into the kiln inlet.
However, the model indicated that a few larger particles would still fall through the upward flow without being entrained.
A further detailed tyre chips de-volatilisation and residence time mathematical analysis suggested a need to raise the tyre chip injection location 9 meters higher than the original position.
These modifications were implemented on site and as a result the tyre chip feed was able to be increased from 2 to 7 tonnes per hour, an increase of pre-calciner tyre thermal contribution from 20% to over 60%.
Cinar is a high-tech company established in 1988, as a 'spin-off' enterprise from Imperial College London.
It is a broad based engineering and technical consultancy specialising in energy issues, fuel conversions, flame monitoring and control systems and turn-key operation of non-conventional combustion and emission equipment.
Cinar has sought and earned especial expertise in the field of advanced mathematical modelling of engineering fluid flows resulting in valid and accurate simulations.
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