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ABSTRACT

Pyrolysis is the first step of all thermochemical valorization processes of biomass. It is therefore appropriate to begin the work by studying the pyrolysis of waste and its constituents. Tests under pyrolytic conditions were carried out on a dedicated reactor, hereinafter referred to as the pyrolysis test bench, to assess the distribution of the various products (solid, gas and liquid) and determine their nature as a function of the operating conditions. The combustible mix considered is made up of 88% wood, 7% cardboard and 5% plastic. This represents the combustible portion of household solid waste from the city of Abomey-Calavi in Benin. Analytical instruments such as Fourier Transform Infrared (FTIR), GC-CTD, GC-MS and GC-FID were used to determine material and energy balances, and the composition of condensable and non-condensable gases. A calorimetric bomb was used to determine the energy content of solid residues. The results showed that the energy yield of all fuels increased with temperature, reaching 81.5% at 900°C. The choice of optimum conditions for the pyrolysis of Abomey-Calavi’s waste will be based on these experimental data, but cannot be derived from them alone. A techno-economic study will first have to be carried out to identify the optimum scenario.

Keywords: mixed fuel, pyrolysis, material balance, energy balance, energy efficiency