Numerical Investigation on Hydrodynamic Combustion and NOx Emission Behavior in 8 MW Circulating Fluidized Bed
O. İpek, B. Gürel and M. Kan
Suleyman Demirel University, Mechanical Engineering Department, Isparta, Turkey
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Multi-phase flow is one of the types of flow which is frequently observed in natural phenomena and engineering applications. Circulating fluidized beds constitute an important application of multi-phase flow. The combustion and emission behaviours in circulating fluidized beds are determined by hydrodynamic of bearing. The most appropriate combustion can be provided with the hydrodynamic structure of bearing, taking into account fuel and operating parameters. Therefore, the hydrodynamic structure of circulating fluidized beds should be displayed with mathematical/physical modelling and simulation approach for its analysis and synthesis. Mathematical analysis in today's conditions is very difficult or impossible because of excessive turbulence, unstable and two-phase flow characteristics of the bed. Therefore, the most effective way to do this is the use the physical modelling and simulation approach. In this study, 8 MW circulating fluidized bed hydrodynamic analysis are made by ANSYS-FLUENT R14 commercial CFD code and then combustion and emissions analysis are made with hydrodynamic analysis results. These analysis results show that combustion chamber exit mean NOx emission was 38.5 ppm and combustion chamber exit mean temperature was 1123 K.

DOI: 10.12693/APhysPolA.132.553
topics: circulating fluidized bed, hydrodynamic analysis, multi-phase flow, NOx emissions, clean coal