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Biomass Steam Processing (BSP) is a steam assisted slow pyrolysis aims to densify the energy content of lignocellulosic feedstocks through a thermochemical conversion process. Evolution of BSP is the outcome of several years of experimental investigation on different processes and scales. Complexity of the multi-scale nature of biomass feedstock and uncertainty about chemical reactions as well as multiphase flow of educts and products in the reactor make these processes very difficult to be predicted and understood precisely. Development of this process can have a positive influence on the localizing of energy densification plants for biomass residues as an economical alternative energy source. BSP can be a profitable waste-to-energy strategy and ecological solution for biological waste disposal issues.
The proposed research project will gradually develop a modular program for the numerical simulation of solid transport, heat transfer and chemical reactions of granular solid biomass in continuous tubular reactor with relative motion between solid and reactor wall or reactor built-in installations. Therefore, from simple models, e.g. cascade models, the study can be started in order to investigate and quantify the influences of the different partial models for the complex chemical and physical processes. Based on these investigations, the discrete element methods (DEM), which are adapted suitably for use with fluid dynamics governing equations, can be used in computational fluid dynamics (CFD). With this program system, different plan processes such as auger reactors, which are used in the carbonization of lignocellulosic biomass, will be numerically simulated. However, the core of the program is also intended to be used for other reactor forms, e.g. Rotary Kilns or tube reactors with rotating blade-like internals.