Colloquium announcement

Faculty of Engineering Technology

Department Energy Technology (TFE)
Master programme Mechanical Engineering

As part of his / her master assignment

Gutta, S.S.G. (Gopal)

will hold a speech entitled:

Waste tyre pyrolysis: temperature, heating rate and particel size study using TGA and CTGA



Waste tyre management has become an important concern since there accumulation are increasing every year. Land disposal, recycling and other techniques of waste tyres have a far-reaching environment, human health, and  economic consequences. There is a need for continuous research in finding new and efficient methods for waste and fuel management. The shift from fossil based society to the one based on renewable-based one is an engineering challenge for engineers around the world. Replacing fossil fuels with renewable energy sources can not be the primary focus. It is also necessary to produce a breakpoint in the value chain of materials. It is important to migrate towards a circular economy strategy that utilizes process residues as feedstock for a new process.  This study relates to the experimental tests and results regarding the study of waste tyre pyrolysis, conducted by using Thermogravimetric analyzer and Cylconic thermographic analyzer to analyse the effect of temperature, heating rate and particle size during slow and fast pyrolysis.

In the Thermogravimetric analyzer the thermal decomposition behaviour and kinetics of passenger car tyre and truck tyre are examined in an inert atmosphere for particle sizes between 0 to 2mm and at low heating rates. In order to design an efficient conversion unit, information on the reaction kinetics of pyrolysis is required.  The results of TGA analysis show that the decomposition of waste tyres occurs in three major regions suggesting the application of three component decomposition model. Isoconversional methods are  used to find the activation energy and the master plots method was used to find the reaction model that is most suitable to describe the devolitization of tyre materials. Finally, the kinetic parameters calculated are validated by simulating the experimental curves for different particle sizes and heating rates.

Using the Cyclonic thermographic analyzer the kinetics and the influence of particle size and temperature are studied based on the conversion time. The conversion times are measured at temperatures 500,600 and 700 °C for particle size fraction between 0 and 2mm. A mathematical model based on kinetics and heat transfer was developed. The predicted results by the model agree well with experimental data for smaller size particles while the differences can be found far larger particles