辐射废锅内气固两相流场的冷态测试与数值模拟

采用冷态实验测量和数值模拟相结合的方法,对辐射废锅内的冷态气固两相流场进行了研究。搭建了辐射废锅冷模装置,利用恒温热线风速仪和皮托管对辐射废锅内的气相冷态流场进行测量。利用马尔文激光粒度分析仪对辐射废锅出口、底部渣池以及附壁颗粒的粒径进行了采样分析。运用Realizable k-ε湍流模型和随机轨道模型分别对气相流场和颗粒运动轨迹进行了数值模拟。研究发现:Realizable k-ε湍流模型计算得到的气相流场结果与实验值吻合较好,辐射废锅内筒顶部存在一入口射流,射流沿流向逐渐衰减,气相流场在内筒底部趋于稳定;大部分颗粒直接被辐射废锅渣池捕集,少量细小颗粒被气流携带进入辐射废锅环隙或从出口逃逸;颗粒粒径越大、密度越高,颗粒的跟随性越差,出口颗粒的停留时间越长。

Cold-Model Experiment and Numerical Simulation of Gas-Particle Flow Field in Radiant Syngas Cooler

Cold-model experimental measurement and numerical simulation were combined to study the gas-particle flow field in Radiant Syngas Cooler(RSC).A cold-model of RSC was set up.The Dantec hot-wire anemometry system and pitot tube were used to measure the gas flow field in the RSC,and the particle size distributions collected from different sections of RSC were analyzed by Malvern laser particle size analyzer.The Realizable k-ε turbulent model and Discrete Random Walk(DRW) were applied to simulate the gas phase flow field and particle moving trajectories,respectively.The results indicate that the gas flow field simulated by Realizable k-ε turbulent model agrees well with the experimental data.An inlet jet flow is formed in inlet region of inner cylinder of RSC,and the jet tends to be steady along the flow direction.Most particles are captured by slag pool,and only a little amount of small particles entrained by gas flow will flow into annular of RSC or escape from outlet.The larger size and higher density the particle has,the worse its following behavior is.