【作者】 张宝存；

【导师】 赵景利；

【作者基本信息】 河北工业大学 ， 化工过程机械， 2006， 硕士

【摘要】 垂直栅板型除沫器是一种新型的气液分离设备,它结构简单、制作容易、清洗方便。本文用数值模拟和模拟实验的两种方法研究了这种除沫器的除沫性能。 本文利用计算流体力学商用软件Fluent 6.0对除沫器中的气液两相流动进行了数值模拟。首先用标准k-ε模型对除沫器通道中的气相流场进行了模拟,然后用Fluent 6.0中的离散相模型模拟了气液两相流动。模拟结果表明:①随着进口气速的增大,离心运动加剧,分离效率先随出口气速的增大而增大至临界点即最大值,然后由于湍流程度的加剧,二次夹带增大,分离效率随出口气速的增大而减小;②进口气速的增大造成湍流程度的加剧,因而压降随之不断增大。 对垂直栅板型除沫器的性能进行了实验研究。实验采用喷雾来模拟工业应用中除沫器的实际工作环境,在常温常压的条件下,测定了喷嘴不同进液量下气流速度与除沫器的压降和分离效率的关系。实验结果表明:①垂直栅板型除沫器的适用进口气速范围为5m/s-15m/s,临界气速在11m/s左右。②分离效率先随出口气速的增大而增大至临界点即最大值,然后随出口气速的增大而减小;最佳工况下的分离效率达95%以上。③压降随气速的增大而增大。在适用进口气速范围内,压降在100Pa-600Pa之间。 数值模拟结果与实验结果基本吻合。误差在5%-20%的范围以内。 本文的研究结果对该类型的除沫器的设计和制造具有重要的参考价值和指导意义。更多还原

【Abstract】 With its main virtue of high separation efficiency,simple structure, being made easily and being cleaned easily,the vertical grid blank mist eliminator is a new type liquid-gas separator .In this paper, the performance of the mist eliminator was investigated by numerical simulation and experiment.In this paper,the liquid-gas flow in mist eliminator was numerically simulated by CFD’s commercial software-Fluent 6.0. First, the flow field in mist eliminator was numerically simulated with the Standard k-e Model and then the liquid-gas flow was numerically simulated using Fluent 6.0’s Discrete Phase Model. The numerical simulation result showed that ① Centrifugal movement and the separation efficiency increased steadily with the gas velocity until it reached a peak value and thereafter diminished with turbulent strengthening because of further increase in gas velocity. ② Because of increasing turbulent,the energy loss increased,and the pressure drop increased with the gas velocity.The performance of the mist eliminator was investigated by experiment. Using spray to simulate the mist eliminator’s actual working environment, at the condition of normal temperature and normal pressure, the relation between separation efficiency and outlet gas velocity, the relation between pressure drop and outlet gas velocity was investigated by experiment. The experimental result was basically accord with the numerical simulation result.The suiltable inlet velocity was in 5m/s—15m/s, and the limited velocity was abaut 11 m/s,the pressure drop was in 100 Pa—600 Pa.The result of the investigation will be helpful for designing and applying the vertical gridblank mist eliminator.更多还原