1GW单炉膛单切圆塔式锅炉炉内流场特性研究

采用计算流体力学软件FLUENT,选用Reynolds应力湍流模型和欧拉多相流模型,对国产首台1GW单切圆单炉膛塔式锅炉炉内的煤粉空气两相流动过程进行了数值模拟,得出了炉内各截面的速度场、假想切圆直径、浓度场、压力场及湍流动能k、湍流耗散率ε和湍流集中度Ι的分布.结果表明,颗粒呈螺旋上升趋势和螺旋沉降趋势,形成“W/M...

Research on Flow Field Characteristics in a 1GW Single Circle Tangential Firing Single Chamber Boiler

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 1GW single circle tangential firing single chamber boiler.The distribution of gas velocity field,the diameter of the imaginary tangential round,volume fraction field,static pressure field as well as turb-kinetic-energy(Κ),turb-diss-rate(ε),turb-intensity(Ι),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%,at the same time,Κ,εand Ι in the exit of the chamber were smaller than in any other section,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 becomes bigger.