@misc{GerberOevermann, author = {Gerber, Stephan and Oevermann, Michael}, title = {A two dimensional Euler-Lagrangian model of wood gasification in a charcoal bed — Particle histories}, series = {Powder Technology}, volume = {324}, journal = {Powder Technology}, issn = {0032-5910}, doi = {10.1016/j.powtec.2017.10.032}, pages = {5 -- 15}, abstract = {An Euler-Lagrangian simulation applied to wood gasification in a fluidized bed is used to investigate individual particle histories and to provide a statistical analysis for temperature, apparent density as well as radial and axial positions of charcoal and dry wood particles. The model and several parameter variations have been discussed in detail in previous articles [1], [2], [3]. Based on simulation results we find much higher particle heating rates than typically used to measure kinetic data for, e.g., pyrolysis models. Although we presented a rather complex interplay of particle heating rate, biomass decomposition, particle shrinkage and particle fluidization the simulation results emphasize the importance of the usage of realistic particle size distributions for the initial bed as well as the fuel inlet. Furthermore, particle shrinkage data in combination with mass decomposition data appear to be crucial for realistic simulations.}, language = {en} } @misc{GerberOevermann, author = {Gerber, Stephan and Oevermann, Michael}, title = {A two dimensional Euler-Lagrangian model of wood gasification in a charcoal bed - Part III: parameter influence and comparison}, series = {Powder Technology}, volume = {310}, journal = {Powder Technology}, issn = {0032-5910}, doi = {10.1016/j.powtec.2016.12.057}, pages = {163 -- 174}, abstract = {The efficient utilization of biomass in fluidized bed reactors depends on numerous operation conditions and parameters which can be investigated systematically with computational models. Based on a previous study [1] we compare a base scenario which mimics the experimental situation with different parameter settings for an Euler-Lagrangian simulation of wood gasification in a fluidized charcoal bed. For the varied parameters superficial velocity, reactor wall temperature, air inlet temperature, wood particle size, and the wood inlet temperature we analyse the simulation results based on data for temporal evolution of reactor outlet temperature, averaged particle temperature, overall wood mass, overall charcoal mass, concentrations of several gaseous species (N2, CO, CO2, H2, H2O, CH4, C2H2, and three virtual tar components) and axial barycenter data of particles bed mass. Furthermore we show time averaged data for gaseous species and gas phase temperature at the reactor outlet. At the end we critically examine our findings under consideration of the models opportunities and limitations.}, language = {en} }