Sewage sludge combustion model with reduced chemical kinetics mechanisms

Abstract Commonly applied 3D CFD models lack suitable combustion description of fuels with complex composition, such as encountered in wastewater sludge specific applications. This significantly influences their prediction capability, particular when used small, confined volumes. To tackle this challenge, it is necessary to introduce detailed chemical kinetic for specifically tailored fuel surrogates, which ensure physically accurate local thermodynamic conditions and heat release rates. However, necessity increase the level detail needs be balanced by computational expenses preserve applicability solving real engineering problems. With an aim fill gap, present study extends existing surrogate model methods applications small-scale systems include also reduced mechanisms. The innovative extension applies Simulation Error Minimization Connectivity Method involves tailoring mechanisms variable compositions, sewage combustion. Suitability proposed approach confirmed 3-D simulations maintaining similar accuracy within design space well off-design conditions, while sufficient flexibility adapt different types compositions sludge. Thereby, reduction in-model ethanol propene from 47 71 species down 33 34 species, respectively, was demonstrated together linearly dependent decrease time. resulting thus first time offer efficient tool affordable virtual using composition.