Abstract: The close-to-streamline numerical simulation method was adopted to geometrically 1∶1 simulate large-scale high concentration ESP gas inlet hood and its complicated internal structures such as dedusting angle iron and two perforated gas distribution plates with up to ten thousands holes.The realizable k-ε model and stochastic particle track model were used for gas-solid flow simulation.The numerical results showed the gas velocity, particle concentration and flow resistance distributions of the gas inlet hood.The comparison between simulation and field measurements showed good agreement.It demonstrated that the close-to-streamline numerical simulation method could accurately simulate the gas-solid flow in the high concentration ESP gas inlet hood in detail.As to the simulated gas inlet hood, the results illustrated that the velocity distribution in the exit was low at the center and high at the surrounding areas.Dedusting efficiency was about 27.6% and flow resistance was up to 766 Pa.

摘要： 利用近流线数值模拟方法，采用与大型高浓度电除尘器入口封头原型完全相同的1∶1的几何模型，详细真实地模拟了入口封头及其内部具有复杂结构的预除尘角钢和两层开孔达数万个的气流分布板.采用可实现性k-ε模型和随机颗粒轨道模型，对其气固两相流动进行了数值计算，得出了气相速度分布、颗粒浓度分布和流动阻力分布特性.计算结果与工业性试验数据进行了比较，两者吻合较好，提出并证明了利用近流线数值模拟方法可以详细真实地模拟高浓度电除尘器入口封头内部结构及其气固两相流动.计算和试验结果均表明，所研究的高浓度电除尘器入口封头，其出口处气流分布为中间区域偏低，四周区域偏高；其预除尘效率约为27.6%左右，其流动阻力高达766Pa.