【作者】 张文卿；

【导师】 姜斌；

【作者基本信息】 天津大学 ， 化学工程， 2004， 硕士

【摘要】 气液分布器是重要的填料塔内构件，其性能的优劣，直接关系到填料塔全塔的正常操作及产品质量。特别是对于大直径、浅床层、低压降的填料塔，分布器的流场均布性能尤为重要。本文借助计算流体力学（CFD）软件FLUENT来模拟大型填料塔气体分布器、液体分布器流场初始分布、从复杂的流体运动状态中考察其影响因素，探索改进之方。具体工作主要有对Φ7400mm填料塔双切向环流气体分布器，进行了一系列的模拟计算，来考察其结构参数对分布器流场均布性能和压降的影响。分别对Φ4.57m和Φ6.09m槽式液体分布器预分布管的开孔方式对流体均布性能的影响，基于不同的长径比和进料量分别进行了实验研究，并佐以CFD模拟，分析实验结果和模拟结果，提出优化设计方案。模拟研究了双切向环流气体分布器内外套筒间距、导流板数量、导流板轴向倾角、导流板径向夹角，导流板的排列方式和分布器综合性能之间的关系，并结合具体工艺参数对潜在的影响进行评估，研究表明：流体经过分布器的能量损失主要集中在分布器和进料管接口区域以及前两块导流板上。内外套筒间距L=1.2m,分布器综合性能最优。导流板数量N＝10，径向夹角为30o,轴向倾角为10o,分布器综合性能优良。进气速度V=50m/s，适当降低靠近分布器进口处导流板叶片的高度可以提高分布器流体均布性能，使塔效率更易充分发挥。流体在槽式液体分布器进料预分布管中的流动属于分支流系统，其流型复杂多变。本文对其流场分布进行了实验研究，并利用FLUENT软件进行了数值模拟，模拟结果和实验结果吻合良好，并成功应用于生产实践，研究表明通过数值模拟可以避免设计失误造成分布器分布性能不良。更多还原

【Abstract】 Gas–liquid distributors are important tower internals. Their qualities of performance are directly related to proper operation of the whole tower and qualities of productions. The flow distribution capacity of distributors is most important, especially for tower with large diameter, shallow bed or low pressure drop. This paper stimulated initial flow distribution of gas distributor and liquid distributor in large tower using CFD software FLUENT, researching their influencing factors from complicated kinestate of fluid and finding modified methods. Specific tasks were mainly stimulating twin-tangential annular deflector gas distributor in Φ7400mm packed column, and studying effect of its structure parameters on the flow distribution and the press drop of the distributor. After experimental studying on the pre-distributed pipes that matched with Φ4.57m and Φ6.09m slot liquid distributors, flow distributions with different processing and structural parameters were observed and stimulated on CFD. Optimum design schemes were put forward after comparing the simulation results with experimental results.Many things were researched in this paper, including the spacing between internal and external sleeves of twin-tangential annular deflector gas distributor, the number of guide plates, their axial slope angels and radial angels, the relationship between arrangement way of guide plates and combination property of distributor. Meanwhile, the potential impacts on distributor were evaluated combined with specific processing parameters. The research indicated that:the energy loss through distributor is mainly occurred in the vicinity of the interface between feed pipe and distributor;when spacing between internal and external sleeves L=1.2m, the optimal combination property of distributor were generated;when the number of guide plates N＝5, moreover, axial slope angels is 30o and radial angels is 10o, the combination property of distributor were better;if the inflow velocity V=50m/s, the blades height decrease of guide plates near to inlets of distributor might improve fluid distributing performance in distributor, simultaneously increased the tower efficiency.The flow in feeding pre-distributed pipes of slot liquid distributor is divergent streams, and its flow pattern is very complicated. After experimental study on flow distribution and numerical stimulation using FLUENT, it could be found that the <WP=4>stimulation results are consistent with the experimental results and the practice was most successful. The numerical stimulation could cover the shortage of design and optimize the performance of distributor.更多还原