Z. Yan, X. Luo, M. Yang, D. Yang, C. Zhang, Z. Kang, and Z. Gao (PR China)
Thermal power engineering,Reynolds Stress Model, ultra supercritical tower boiler, single circle tangential firing boiler; numerical simulation
The Reynolds Stress Model and Eulerian Model of The Computational Fluid Dynamics (CFD) code FLUENT was employed to evaluate the flow process field of two-phase between pulverized coal and air in a 1000MW tangential-firing round tower boiler.The distribution of gas velocity field, the diameter of the imaginary tangential round, volume fraction field, static pressure field as well as turbulence-kinetic-energy,turbulence-disc-rate,turbulence-intensity, in the down, middle and upper zone of the furnace was obtained.The numerical results showed that particle was a spiral upward trend and spiral sedimentation trend, and formed a "W/M" streamline; The tangential velocity surplus residual in the chamber exports was only less than the maximum speed of 22.7%, these shows that the residual swirling in chamber exports was small; From the corner of the down water-wall to the upper pulverized coal burners on the third floor of the furnace wall between nearby area is the concentration VOF region , the water-wall tubes around the region are easy coked; With the increase of furnace, the pressure value become bigger.
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