3D-SIMULATION OF CONCENTRATION DISTRIBUTIONS INSIDE LARGE-SCALE CIRCULATING FLUIDIZED BED COMBUSTORS
With increasing size of modern CFB combustors the lateral mixing of fuels and secondary air gains more and more importance. Strong concentration gradients, which result from improper lateral mixing, can lead to operational problems, high flue gas emissions and lower boiler efficiencies. A 3D-model for the simulation of local gas and solids concentrations inside industrial-sized CFB boilers has been developed. The model is based on a macroscopic approach and considers all major mechanisms during fuel spreading and subsequent combustion of char and volatiles. Typical characteristics of modern boilers like staged combustion, a smaller cross-sectional area in the lower section of the combustion chamber and the co-combustion of additional fuels with coal can be considered. The 252 MWth combustor of Stadtwerke Duisburg AG is used for the validation of the model. A comprehensive picture of the local conditions inside the combustion chamber is achieved by the combination of local gas measurements and the three-dimensional simulation of concentration distributions.
simulation local concentrations CFB combustor industrial-scale
R.Wischnewski L.Ratschow E.U.Hartge J.Werther
now with Hydro Aluminium AS, Oslo, Norway now with P(o)yry Energy GmbH, Hamburg, Germany Institute of Solids Process Engineering and Particle Technology, Hamburg Universityof Technology, D2
国际会议
第20届国际流化床燃烧会议(20th International Conference on Fluidized Bed Combustion)
西安
英文
774-779
2009-05-18（万方平台首次上网日期，不代表论文的发表时间）