Authors: Krusch, Sebastian a; Scherer, Viktor a
a Department of Energy Plant Technology, Ruhr-University, Bochum, Germany
Source: 23rd International Conference on FBC
Description: The study presents profile measurements of gas emissions, temperature and pressure in a circulating fluidized bed combustor (CFBC) test rig firing two different bituminous coals (German Auguste Viktoria (AV) and US High Sulfur). The results of the AV coal are compared with 3D simulations of the test rig using the commercial code CPFD Barracuda. The particle phase description is based on the Multiphase Particle-in-Cell (MP-PIC) method.
The simulation of the combustion process of the coal is based on global kinetic approaches from literature, which comprise drying, pyrolysis, homogenous combustion of pyrolysis products and heterogeneous conversion of char. Pyrolysis kinetics has been derived from the CPD model. The char burn-out model accounts for char reactions with O2, CO2 and H2O.
The trends of the pressure profiles along the riser height are well represented by the simulations. However, the study shows the limitations of literature kinetic data in order to represent measured emission data. Whereas, majority species like O2 and CO2 are well reproduced by the simulations, CO shows still significant differences.