共查询到17条相似文献,搜索用时 140 毫秒
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筛板不均匀漏液的规律及其影响 总被引:2,自引:0,他引:2
筛板不均匀漏液的规律及其影响曾爱武刘富善许松林黄洁余国琮(天津大学化学工程研究所,天津300072)关键词筛板不均匀漏液塔板效率1引言塔板漏液是一种导致塔板效率降低的纵向返混。在工程设计中通常以相对漏液1~10%来决定气相负荷下限,但值得指出的... 相似文献
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MD塔板的流动模拟和效率计算 总被引:5,自引:0,他引:5
张志群 《高校化学工程学报》1994,8(3):250-257
本文采用二维定数混合池模型研究MD塔板上液体的流动行为,提出了计算MD塔板Murphree板效率的数学模型。模型计算值与实验测定值吻合较好,平均相对误差为5.7%,最大相对误差不超过15.0%,同时还考察了混合池数选择和流动模拟形式对模型计算结果的影响。 相似文献
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通过导出考虑床层流速分布的径向床二维非均相模型,考察了不均匀流动对三段径向冷激式氨合成塔性能的影响,模拟计算表明了不均匀流动会对径向合成塔性能造成一定的影响,在各种不同的床层进口温度,人口氨浓和活性系数下,流动的不均匀度所造成的影响是不同的,提高进口温度、降低入口氨浓和提高活性系数有利于降低流动不均匀度的影响。流动不均匀对三段径向合成塔净值和生产能力的影响是有限的,在计算条件下,均匀流动和不均匀度 相似文献
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The Mai-distribution of Weeping from a Distillation Tray and Its Effect on Tray Efficiency 下载免费PDF全文
曾爱武 《中国化学工程学报》2002,(5)
Experiments demonstrated that the weeping is mal-distributed and occurs mainly in a region of tray deck next to the inlet weir. The amount of weeping in this region depends on the weeping rate. On this basis, three types of weeping distribution are proposed. The effect of mal-distributed weeping on the Murphree tray efficiency is evaluated by using the three-dimensional non-equilibrium mixing pool model, where the influences of the flow pattern and the variation of Murphree point efficiency on a tray are taken into account. The calculated results reveal that the extent of Murphree tray efficiency drop depends chiefly on the degree of mal-distribution and the percentage of weeping. It is also demonstrated that in the determination of the lowest operating limit of vapor velocity, the unfavorable effect of mal-distributed weeping should be considered as an important factor and cannot be ignored. 相似文献
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Sieve trays are widely used in fractionating devices like tray distillation towers existing in separation and purification industries. The weeping phenomenon that has a critical effect on the efficiency of tray towers was studied by a numerical model and some experiments. The experiments were carried out in a pilot scale column with the diameter of 1.22 m that includes two test trays and two chimney trays. Weeping rates and some hydraulic parameters were measured in sieve trays with the hole area of 7.04%. Furthermore, the total weeping rate and weeping rate in inlet and outlet halves of the test tray were determined. It was also used an Eulerian–Eulerian computational fluid dynamics (CFD) method for the present study. The model was able to predict the dry tray pressure drop, total pressure drop, clear liquid height, froth height, and weeping rate simultaneously. Furthermore, the obtained CFD results were in a good agreement with the experimental data in terms of pressure drop and the model properly predicted several hydraulic parameters like the liquid weeping behavior along the tray. 相似文献
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锯齿边窄条阀塔板流体力学和传质性能实验研究 总被引:3,自引:1,他引:2
详细分析了锯齿边窄条阀的锯齿边对传质性能的影响和锯齿边窄条阀的结构特点。在1000 mm×350 mm规格的实验塔中,以典型的水-空气冷模实验系统,对锯齿边窄条阀STV75塔盘和F1圆形浮阀塔盘进行了对比实验,测定了多种气液负荷下的压降、雾沫夹带、泄漏量等流体力学性能。利用氧解吸法,测定了塔板传质效率。实验结果和工业应用表明,在相同条件下,锯齿边窄条浮阀塔板比F1圆形浮阀塔板的板效率提高10%—20%、板压降降低100 Pa以上,雾沫夹带与泄漏与F1阀相当,是一种综合性能优良的新型浮阀。 相似文献
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A mass transfer model to predict tray efficiency on industrial GS process sieve trays is presented. Tray efficiencies are predicted from point efficiencies on large trays up to 8.5 m in diameter, by taking into account effects of liquid flow distribution, weeping, entrainment, gas mixing and liquid mixing in the downcomers. Predictions by the model agree with tray efficiencies measured at the heavy water plants. 相似文献
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新型固定阀塔板的流体力学和传质性能研究 总被引:4,自引:1,他引:4
提供了一种阀盖两侧具有向下弯曲折边的新型固定阀。在内径为500mm的有机玻璃塔内,以空气水为物系,研究了其流体力学性能;在内径为300mm的不锈钢塔内,以乙醇水为物系,常压全回流情况下,研究了其传质性能。研究结果表明:新型固定阀塔板的板压降略高于筛孔塔板,比F1 浮阀塔板小得多,雾沫夹带量小,雾沫夹带液泛点阀(筛)孔动能因子均比筛孔塔板、F1 浮阀塔板大,漏液量较小,漏液点阀(筛)孔动能因子比筛孔塔板低,比F1 浮阀塔板高,传质效率与F1 浮阀塔板相当。 相似文献