Trajectories of burning coal particles in highly swirling reactive flows

• Published in: International journal of heat and fluid flow Vol. 16; no. 5; pp. 440 - 450
• Main Authors: Görres, J., Schnell, U., Hein, K.R.G.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY Elsevier Inc 1995; Elsevier Science
• Subjects: Algebra; Applied sciences; Coal combustion; Combustion of solid fuels; Combustion. Flame; Computational methods; Energy; Energy. Thermal use of fuels; Exact sciences and technology; Finite element method; Gases; Lagrangian simulation; Mathematical models; Navier Stokes equations; Particles (particulate matter); Temperature measurement; Theoretical studies. Data and constants. Metering; Turbulence; turbulence modeling; Velocity measurement; Lagrangian simulation; turbulence modeling; coal combustion; Gas particle flow; Experimental test; Swirling flow; Particle motion; Pulverized coal; Combustion; Trajectory; Modeling; Lagrangian method
• ISSN: 0142-727X; 1879-2278
• DOI: 10.1016/0142-727X(95)00046-S

Finite-element computations and measurements of a strongly swirling flow with pulverized coal combustion are presented. The turbulent flow expands into a low confined combustion chamber which represents the geometry of typical industrial furnaces. Detailed in-flame measurements of velocity, temperature, and gas concentrations were made by suction probes at several cross sections. These data are used for the detailed evaluation of higher-order turbulence models in connection with coal combustion. In modeling the particle-gas flow, the momentum equations are solved by considering the particle phase as a continuum and neglecting the mean slip velocities between the two phases. Trajectories of the individual particles treated as inert matter are subsequently computed employing a Lagrangian method after a convergent flow field solution is obtained. The external forces which influence the particles' motion are considered and compared. Additionally, in a more realistic approach, the mass loss of the coal particles due to devolatilization and char-burnout is taken into account. The influence of the gas-phase turbulence modeling on the particle motion is also investigated.