Numerical Modeling of Thermochemical Conversion of Biomass and Tires as Fuels for Cement Clinker Production

This article presents the numerical modeling of thermochemical conversion biomass and tires as alternative fuels in kilns dedicated to production cement. The study seeks understand control phenomena that occur when heavy fuel oil (traditional fuel) is partially replaced by tires. These are thoroughly mixed with meal at entrance rotary kiln form bed solids. mathematical model developed takes into account both chemical reactions fuels. At entrance, made up species such CaCO3, MgCO3, Al2O3, SiO2, Fe2O3, MgO, CaO, C2S, C3A, C4AF C3S, some which along kiln. focuses specifically on influence clinker or cement obtained. properties (moisture, organic matter, composition, energy value, etc.) tires, associated operating parameters kiln, greatly clinker. In order behavior each material (cement) process, follows evolution step-by-step, until effect was found for kiln’s operational parameters, dynamic angle (30°), inclination (2°), rotation (2 rpm), length inside diameter, respectively (80 m) (4 m); physical (humidity, organic, inorganic C, H, O, N, S, Cl); lower calorific raw material); (spatial discretization 30 120). Despite high content tire fuels, results use give better characteristics clinker/cement (52.36% C3S 3.83% CaO).The show pyrolysis endothermic, heat reaction be ∆rHpyro=184.9 kJ/kg, whereas a ∆rHpyro=−1296.3 kJ/kg found, showing this exothermic. Char higher case than biomass, rates 0.261 kg/kgOrg.Mat. 0.196 kg/kgOrg.Mat., respectively. cases, waste complete (100%). obtained different cases meets requirements Portland cements (73.06% silicates 18.76% aluminates), (100%), specific consumption almost consistent values from literature.