WASTE TIRE STEAM PYROLYSIS KINETIC

Abstract

Link for citation: Larionov K.B., Gubin V.E., Gorshkov A.S. Waste tire steam pyrolysis kinetic. Bulletin of the Tomsk Polytechnic University. Geo Аssets Engineering, 2023, vol. 334, no. 6, рр.204-212. In Rus. The relevance of the study is determined by the long-term and consistently high level of tire waste formation. In addition, the amount of recycled tires in Russia is currently smaller compared to countries with high environmental culture. There are statute recommendations on the involvement of secondary raw materials in the manufacturing sector. A possible method for recycling waste tires by steam pyrolysis is proposed, which provides obtaining valuable products in the form of oil and carbon residue. The paper presents a comparison of the processes of steam and oxygen-free (argon) pyrolysis in terms of the values of formal kinetics, which can be used in the development or modernization of industrial equipment. The aim of the research is to determine the activation energy of waste tire decomposition in inert argon medium and in superheated steam medium. Objects: waste tire granulate from extra-large. Methods: thermogravimetric analysis, proximate analysis, in-line gas analysis, Ozawa–Flynn–Wall method, Friedman method, Kissinger–Akahira–Sunosse method. Results. According to the data of thermogravimetric analysis, the values of the parameters of thermal decomposition were determined. With an increase in the heating rate, regardless of the type of medium, the following was observed: clear increase in the maximum mass loss rate, larger mass of the pyrolysis residue, and a shift of the process to a high-temperature region. The use of steam as an inert agent provides a more intense and uniform process at a typical temperatures lower by 75–90 °C. Using isoconversional calculation methods (Friedman, OFW, KAS), the values of the activation energy for the decomposition of a used tire sample in argon and steam mediums were determined. The average activation energies in argon and steam were 98,9 and 268,4 kJ/mol, respectively.

Keywords

• waste tire
• steam pyrolysis
• thermal analysis
• proximate analysis
• formal kinetics
• activation energy