Kinetics of granulated scrap tyre pyrolysis via thermogravimetry

  • Peter T. Cherop Durban University of Technology
  • S. L. Kambi Durban University of Technology
  • Paul Musonge Durban University of Technology

Abstract

The global consumption of tyres has increased over the years. However a very small percentage of the total mass of waste tyres can be recycled or reused for other applications. Land-filling has been considered an option to address the problem of scrap tyres. However, large space is required and the reusable resources are wasted. This therefore has led to environmental and economic problem of the disposal of the huge mass of scrap tyres.  Scrap tyre pyrolysis, which is basically  the thermal decomposition in an oxygen-free atmosphere,  can be potentially involved with the recovery of both energy and material.  Thermo gravimetric analysis(TGA) and derivative thermogravimetry (DTG) are the techniques commonly used to measure the mass loss kinetics associated with the vaporisation of materials during pyrolysis. Understanding the kinetics of  scrap tyre  pyrolysis is important in the optimisation design of industrial scale scrap tyre recycling. The purpose of this study was to determine the thermal degradation kinetics of scrap tyres by TGA/DTG, and to compare the apparent activation energy (Ea) and the pre-exponential factor (A) values calculated using Flynn-Wall-Ozawa, Kissinger-Akahira-Sunose and  Coats–Redfern and methods. The experiments were conducted under a nitrogen atmosphere and a temperature range of  20°C to 600°C at different heating rates. The thermal decomposition started at an aver age temperature of about 285°C and was complete at 482°C for the four heating rates.  Results indicate that higher heating rates lead to greater mass losses. The average mass loss was 63.59 wt. % while the  mean  Ea  values obtained by the different models used were similar.
Key words:  activation energy,  pyrolysis, scrap tyre, thermogravimetry
Published
Sep 26, 2017
How to Cite
CHEROP, Peter T.; KAMBI, S. L.; MUSONGE, Paul. Kinetics of granulated scrap tyre pyrolysis via thermogravimetry. Proceedings of Sustainable Research and Innovation Conference, [S.l.], p. 150-155, sep. 2017. ISSN 2079-6226. Available at: <http://sri.jkuat.ac.ke/ojs/index.php/proceedings/article/view/592>. Date accessed: 24 feb. 2018.