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- W2275557530 abstract "A modeling approach of increasing importance for pilot plant and full scale combustion systems is the so called Reactor Network Analysis (RNA), that is an alternative to conventional Computational Fluid Dynamics (CFD) post-processing tools to estimate combustion emissions. The method generates an equivalent network of idealized reactor elements extracted from the results of CFD simulations by an automatic zoning algorithm [1]. Then, detailed reaction mechanisms are applied over the reactor network and a more accurate calculation of the combustion yields is performed. The objective is to predict the emissions of NOx, SOx, CO, soot and unburned carbon in ash. The separation in two steps is possible as minor species have a neglecting influence on the flow field and heat exchange. The basic element of computation in RNA is the Completely Stirred Reactor (CSTR), therefore the applicability to the modelling of pulverized coal flames requires efficient and robust numerical methods for coupling the comprehensive reaction mechanisms on gas phase with fundamental models for coal devolatilisation and char combustion. The present work, after a brief overview on RNA models, focuses on the features of a novel formulation of a two phase CSTR. The heterogeneous CSTR solver developed, accounting for a huge number of size/burnout classes for char particles, is based on the work of Pedersen et al. [2], but some of its characteristics are novel: coal devolatilisation is included adopting Fletcher's CPD NLG model [3], char particle includes its ash forming matter, an integral (rather than differential) population balance is adopted which is naturally predisposed to include fragmentation models, a slip between gaseous and solid time contact can be assigned for each size/burnout class, the system of equations in both gaseous and solid phases are solved at the same time. An application is surveyed to assess the predictive ability of the models." @default.
- W2275557530 created "2016-06-24" @default.
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- W2275557530 date "2006-01-01" @default.
- W2275557530 modified "2023-09-23" @default.
- W2275557530 title "RNA Modelling Approach for the Optimisation of IndustrialCombustion Devices" @default.
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