脱硫吸收塔除雾器性能的实验研究和数值模拟
Experimental study and numerical simulation of characteristics of demister of absorbing tower in desulfurization system
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摘要: 实验研究了不同操作条件、板片型式及板间距对除雾器除雾效率及压降的影响规律，并采用计算流体力学（CFD）方法对除雾器内流场进行了数值模拟与分析。研究结果表明，操作条件对压降和流场影响较小，而板片型式特别是迎风面的几何结构是影响流场与压降的关键因素；随着气速的增大，除雾效率增高，但当气速增到某一临界值（4～5 m/s）后，除雾效率随着气速的增大而迅速减小；除雾器压降的数值模拟结果与实验值吻合良好；除雾器内存在2个回流区，回流区是产生除雾器临界气速的重要原因之一。研究结果可为除雾器优化设计提供指导。
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关键词:
- 除雾器 /
- 除雾效率 /
- 压降 /
- 计算流体力学（CFD） /
- 流场
Abstract: The effects of operation conditions, blade types, blade spacing on the separation efficiency and pressure drop of demister have been experimentally investigated. Meanwhile, the flow field was numerically simulated by using computational fluid dynamics (CFD) approach. The results show that the operation conditions have little effect on the pressure drop and flow field. The blade type, especially the structure of blade, has a significant effect on the flow field and pressure drop. The separation efficiency of demister increases as the gas velocity increasing until the velocity reaches a critical gas velocity (about 4～5 m/s), then it rapidly decreases with the increase of gas velocity. Good agreement can be found between the numerical simulation results and experimental values of pressure drop in the demister.There are two recirculation flow regions in the demister. The critical gas velocity is mainly caused by these two regions. The results are of importance to the optimum design of demister.-
Key words:
- demister /
- separation efficiency /
- pressure drop /
- computational fluid dynamics (CFD) /
- flow field
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