【作者】 安广辉；

【导师】 赵景利；

【作者基本信息】 河北工业大学 ， 化工过程机械， 2005， 硕士

【摘要】 本文以浙江大洋化工有限公司NH₄Cl回收中使用的垂直筛板型除沫器为背景,用实验和数值模拟方法研究了这种除沫器的除沫性能。 对垂直筛板型除沫器的除沫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进行了实验,测定了在不同喷雾量下气流速度与除沫器的压降以及分离效率的关系;在最佳喷雾量不同出口气速的条件下,粘度与分离效率的关系。在本实验条件下的实验结果表明:①分离效率先随出口气速的增大而增大,至临界点为最大值,然后随出口气速的增大而减小,并且分离效率随喷雾量的增大而提高。②分离效率随液滴粘度的增大而提高。③压降随气速的增大而增大。 用计算流体动力学商用软件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模型模拟了除沫器通道中的气相流场,然后用Fluent 6.0中的离散相模型模拟了气液两相流动。数值模拟结果与实验结果基本吻合。 本文的研究结果对该类型的除沫器的设计和应用具有重要的参考价值和指导意义。更多还原

【Abstract】 In this paper, with the background of a vertical sieve tray mist eliminator in Zhejiang Dayang Chemical Ltd. NH4Cl reclaim, the performance of the mist eliminator was investigated by experiment and numerical simulation.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 with different liquid flux. At the same time, the relation between viscosity and separation efficiency was investigated by experiment. This experiment’s result showed that: ① the separation efficiency increased steadily with the gas velocity until it reached a peak value and thereafter diminished with further increase in gas velocity, and the separation efficiency increased with the nozzle’s liquid flux, ②the separation efficiency increased with the drop viscosity. ③ the pressure drop increased with the gas velocity.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 was basically accord with the experimental result.The result of the investigation will be helpful for designing and applying the vertical sieve tray mist eliminator.更多还原