Developing an all-round combustion kinetics model for nonspherical waste-derived solid fuels
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ORIGINAL PAPER
Developing an all‑round combustion kinetics model for nonspherical waste‑derived solid fuels Tibor Szűcs1 · Pál Szentannai1,2 Received: 18 May 2020 / Accepted: 10 September 2020 © The Author(s) 2020
Abstract The utilization of challenging solid fuels in the energy industry (especially the ones derived from wastes) has a big priority nowadays, as it is a valid option to keep the recent EU directive related to the decrease of landfills. However, there are serious technical challenges, connecting to the lack of knowledge about the behavior of these fuels in the combustion chamber. This paper discusses the specific aspects of developing particle models concerning the combustion of these non-conventional fuels. A new modeling approach is presented, using which it is possible to develop an all-round particle model that includes every significant influencing process. Moreover, it does not have any restrictions regarding the shape, size and the origin of the particle. As an integral component of this model, the distinctive aspects of intrinsic reaction kinetics related to waste fuels are presented as well. Keywords SRF · Biomass · Reaction kinetics · Particle combustion Abbreviations A Preexponential factor, 1∕s Aη Parameter of 𝜂m (xapp ) , – c Mass ratio, – cox Scaling factor of the oxygen concentration, – D Distribution function, – E Activation energy, J∕mol Eη Parameter of 𝜂m (xapp ) , – f(x) Reaction function, – F Fitness value, – kd Oxygen diffusion rate constant, 1∕m2 ∕s ks Surface reaction rate, 1∕m2 ∕s km Mass related apparent reaction rate constant, 1∕s kr Chemical reaction rate constant, 1∕s ks Surface reaction rate constant, 1∕m2 ∕s m Mass, kg m Reaction function parameter, – mη Parameter of 𝜂m (xapp ) , – n Reaction order or number of reaction groups, – * Tibor Szűcs [email protected] 1
Department of Energy Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Budapest, Hungary
Fuel and Reactor Materials Department, Hungarian Academy of Sciences Centre for Energy Research, Budapest, Hungary
2
nη Parameter of 𝜂m (xapp ) , – Nj Number of measured points, – R Universal gas coefficient, J∕mol∕K S Particle surface, m2 Sm Mass related reaction surface, m2 ∕kg Sm0 Reference mass related reaction surface, m2 ∕kg t Time, s T Temperature, K x Intrinsic conversion, – xapp Apparent conversion, – xc Calculated conversion, – xm Measured conversion, – vd Diffusive reaction rate, 1∕s vr Chemical reaction rate, 1∕s ηm(xapp) Mass related reaction effectiveness factor, – σ Standard deviation, J∕mol ϵ Parameter of 𝜂m (xapp ) , –
Introduction Combustion of municipal solid wastes is a feasible process, which follows the most recent EU directive (Circular Economy Package 2018) that aims to lower the rate of landfill drastically. The main benefit of combustion is that it reduces the waste’s volume (and the area needed for the landfill as well), while energy is produced during
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