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The article presents the results of RDF (Refuse Derived Fuel) examination in order to use it for energy purpose. RDF material was subjected to thermogravimetric analysis. The TGA analysis confirmed the multi-component nature of tested material. It also indicated that the mixture consists of a minimum of 2 types of materials: biomass and thermoplastic polymers. The pyrolysis was conducted as a batch process with the use of a processing furnace supplied by the IZO Company. RDF sample was pyrolysed under 900 °C in a nitrogen atmosphere. Obtained char and gaseous sample, as well as raw material, were subjected to elemental and gas chromatographic analysis. Furthermore, using ANSYS CHEMKIN-PRO software, numerical simulations of these samples were conducted. Based on the results of composition of pyrolysis gas, the numerical model was validated. Next, modelling of chemical composition of gas from RDF pyrolysis for a pilot installation working in Poland was performed. In addition, the evaluation of the investment costs for the exemplary installation for the thermal conversion of RDF using pyrolysis was made. For this purpose, dynamic methods of investment project assessment were used, which take into account the distribution of anticipated revenues and expenses related to a given investment project over time. • Refuse Derived Fuel (RDF) can be a valuable energy source. • Thermal conversion of RDF by pyrolysis can contribute to limiting waste landfilling. • Calculations with the use of the ANSYS CHEMKIN-PRO software were conducted. • Economic analysis confirmed the legitimacy of the analysed investment. [ABSTRACT FROM AUTHOR]

There can be observed global interest in waste pyrolysis technology due to low costs and availability of raw materials. At the same time, there is a literature gap in forecasting environmental effects of thermal waste treatment installations. In the article was modelled the chemical composition of pyrolysis gas with main focus on the problem in terms of environmental hazards. Not only RDF fuel was analysed, but also selected waste fractions included in its composition. This approach provided comprehensive knowledge about the chemical composition of gaseous pyrolysis products, which is important from the point of view of the heterogeneity of RDF fuel. The main goal of this article was to focus on the utilitarian aspect of the obtained calculation results. Final results can be the basis for estimating ecological effects, both for existing and newly designed installations. Pyrolysis process was modelled using Ansys Chemkin-Pro software. The investigation of the process were carried out for five different temperatures (700, 750, 800, 850 and 900 °C). As an output the mole fraction of H 2 , H 2 O, CH 4 , C 2 H 2 ,C 2 H 4 , C 3 H 6 , C 3 H 8 , CO, CO 2 , HCl and H 2 S were presented. Additionally the reaction pathways for selected material were presented. Based on obtained results, it was established that the residence time did not influenced on the concentration of products, contrary to temperature. The chemical composition of pyrolytic gas is closely related to wastes origin. The application of Chemkin-Pro allowed the calculation of formation for each products at different temperatures and formulation of hypotheses on the reaction pathways involved during pyrolysis process. Further, based on the obtained results confirmed the possibilities of using pyrolysis gas from RDF as a substitute for natural gas in energy consumption sectors. Optimization of the process can be conducted with low financial outlays and reliable results by using calculation tools. Moreover it can be predicted negative impact of obtained products on the future installation. [ABSTRACT FROM AUTHOR]

[Display omitted] • A study of oat straw pyrolysis was performed at various temperatures. • Multifaceted analysis of gas, liquid and solid phases was carried out. • Pyrolytic gas quality increased with temperature. • Chemkin modelling of pyrolysis allowed to predict chemical composition of syngas. Biomass wastes are sustainable, renewable, and promising energy sources. In this study, the pyrolysis of agricultural biomass was investigated to determine the most promising process parameters for pyrolytic gas production. The pyrolysis investigations were carried out under nitrogen atmosphere at 300, 400, 500, and 600 °C on the microscale using simultaneous thermal analysis and a laboratory-scale semi-batch vertical reactor. The solid, liquid, and gaseous products were characterised in detail, including the elemental and chemical composition. The gas and liquid products analyses were provided. It was found that the quality of the pyrolytic gas increased with temperature, both in terms of the pyrolytic gas yield and concentration of gaseous components (hydrogen and methane), whereas the carbon dioxide concentration decreased with temperature. The condensed vapours were rich in phenolic and aromatic compounds, and it was noted that the acetic acid concentration increased with temperature. The chemical functional groups in the char were determined using infrared spectroscopy. The carbon content increased with temperature, whereas the hydrogen content decreased. Further decomposition of the organic matrix was observed with increasing temperature. Additionally, chemical modelling of pyrolytic gas was performed using Ansys Chemkin-Pro software and compared with the experimental results. The computational results showed a good correlation with the measured pyrolytic gas composition, especially in the case of the major gas components. [ABSTRACT FROM AUTHOR]