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Energy recovery
End of life tyres represent an alternative supplementary fuel, with
the same energy content as coal, with lower percentages of sulphur
compared to coal. 1 ton of tyres is equivalent to 1 ton of good
quality coal or 0.7 ton of fuel oil.
In 2007, this recovery option represented 32.3 % of the solutions chosen to manage end of life tyres compared to 14 % in 1992.
- Use in electric power stations as a dedicated fuel
End-of-life tyres are used as alternative fuel for coal.
- Use in electric power stations
When end-of-life tyres are used as a supplementary fuel source to
coal, in general no modification is required to the installation.
- Use in cement kilns
Whole or shredded tyres are used as supplementary fuel to
traditional combustibles in cement kilns. This application utilizes
all the components of the tyre. The combustible components of the
tyre are incinerated for heat generation whereas other substances of
the tyre – silica and steel cord – are used as secondary raw
materials in the cement production replacing the natural resources
glass sand and ferric oxide. Accordingly the utilization of tyres in
the cement industry is characterized by a material recycling rate of
about 25%.
In Europe today there are currently 250-300 cement works, which
could potentially utilize the equivalent of the total number of
end-of-life tyres generated annually.
This application does require some mechanical modifications to the
plant, which are relatively important and costly, anything from 1 to
1.5 million €uro according to whether whole or shredded tyres are
used.
CO2 potential benefits from burning end of life tyres.
Energy Recovery
"Biomass effect" on ELT's combustion
- 20 % of the weight of ELT is latex
- Latex is polyisoprene (C5H8) : it is composed of 88 of Carbon atoms
- 1 ton of ELT generates 647 kg of CO2 from biomass
For the complete combustion 1 ton of
ELT's is equivalent to 647 Kg of CO2
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Update 29 October 2008
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