Mätzing Hartmut, Gehrmann Hans-Joachim, Seifert Helmut, Stapf Dieter
Institute for Technical Chemistry (ITC), Karlsruhe Institute of Technology (KIT), Herrmann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany.
Institute for Technical Chemistry (ITC), Karlsruhe Institute of Technology (KIT), Herrmann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany.
Waste Manag. 2018 Aug;78:686-697. doi: 10.1016/j.wasman.2018.05.008. Epub 2018 Jun 27.
A reactor cascade model is used for the numerical simulation of the fixed bed combustion of biomass, municipal solid waste and other low rank fuels. Non-spherical particle geometries are accounted for via their plain specific surface. The model is able to reproduce key quantities like ignition delay time, ignition rate, reaction front velocity and mass conversion rate in close agreement with experimental data. This provides a basis to transfer the fixed bed results to the situation of continuous combustion on forward acting grates. A simplified numerical procedure is presented for this purpose. It allows to estimate the structure of a fuel bed moving on the grate as well as the overbed gas temperature and composition. These data serve as input for separate CFD applications which simulate the gas flow in small scale and in industrial scale power plants together with the associated heat transfer processes. Validation of the modelling is presented for lab scale and bench scale experiments as well as for an industrial municipal solid waste incinerator.
采用反应器串联模型对生物质、城市固体废弃物及其他低阶燃料的固定床燃烧进行数值模拟。通过非球形颗粒的表观比表面积来考虑其几何形状。该模型能够重现诸如着火延迟时间、着火速率、反应前沿速度和质量转化率等关键参数，与实验数据高度吻合。这为将固定床结果转换至前向移动炉排上的连续燃烧情况提供了基础。为此提出了一种简化的数值程序。它能够估算在炉排上移动的燃料床结构以及炉排上方气体的温度和成分。这些数据作为单独的计算流体动力学（CFD）应用的输入，用于模拟小规模和工业规模发电厂中的气体流动以及相关的传热过程。针对实验室规模和台架规模实验以及一座工业城市固体废弃物焚烧炉，给出了模型的验证情况。
