【作者】 赵现新；

【导师】 姚克俭；

【作者基本信息】 浙江工业大学 ， 化学工程， 2004， 硕士

【摘要】 本文针对开发塔设备新类型的需要，从实验和CFD模拟两方面对新型的固定阀塔板-带折边矩形固定阀塔板以及普通的矩形固定阀塔板进行了研究。 在实验中，利用测速管等仪器对在不同速度下的单阀和双阀固定阀周围的流场进行了点压力测量，然后把点压力转化为点速度后绘出固定阀周围流场的二维流线图，同时测定了塔板的干板压降，来考察新型固定阀带折边后对流场分布和压降的影响，为随后的数值模拟提供对比和依据。 同时，采用商业计算流体力学软件FLUENT软件包对固定阀进行几何建模和网格划分，采用RNGκ-ε湍流模型，计算了固定阀单阀和双阀塔板的二维和三维流场。通过对数值模拟得出的单阀和双阀塔板的干板压降及流场速度分布分析对比后发现，固定阀周围流场存在较强的湍动，阀侧孔与塔板壁面区域以及阀体的上方空间存在明显的涡流区，使气体穿阀后的行为变得复杂，并对气液传质过程产生重大影响；模拟结果表明，为防止和削弱固定阀间的对冲造成的“死区”对传质带来的不利影响，通过折边来改变气体的气路是非常有效的，模拟值与实验值基本得到吻合。 本文研究为新型固定阀塔板的设计及开发提供了依据，并为今后进一步的研究打下基础。更多还原

【Abstract】 In this paper, according to the need of developing new style column, new style fixed-valve tray - rectangular fixed-valve tray with fold edges and common rectangular fixed-valve tray were studied from experiments and CFD simulation.At first, in the process of experiments, it were measured that dry plate pressures drop and point pressures in the flow fields around the single fixed-valve and double fixed-valves under different velocities by using of Pitot tube. After that point pressure was transformed to point velocity, two dimensions flow plane of flow fields around fixed-valve were plotted to observe the difference between of the fixed-valve tray with fold edges and the common rectangular fixed-valve tray on the distributions of flow fields and pressures, to provide comparisons and refer-rence for CFD simulation.Secondly, with commercial CFD code - FLUENT, Three dimensions turbulence flow fields of fixed-valve trays with single valve and double valves were computeed by means of RNG k-e turbulence model in the system of Lagrange. By comparing the dry plate pressures drop and distributions of velocities simulated on single valve with those of double valves, it was found that there was intense turbulence in the flow fields around fixed-valve, there were eddy areas between valve side orifices and tray wall, there were eddies above the valves too, these led to the complex behaviors of gas perforating valve, these had a great effect on the gas-liquid mass transfer process.At the same time, in order to prevent the disadvantageous effect of gas between one valve with another on the gas-liquid mass transfer, it was very effective to change the fields of gas perforating valve by folding the edges of valve.The study provides gists for the design and development of new style fixed-valve trays and establishs bases for further studies.更多还原