共查询到16条相似文献,搜索用时 78 毫秒
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采用空气-水作为系统,在直径1 200 mm、内置4层塔板的冷模塔中,对阀腿高度为10 mm、单个开孔尺寸为44 mm x 25 mm的H形导向固阀塔板进行了雾沫夹带实验研究,考察了 3个液流强度、3个堰高因素对雾沫夹带率的影响.同时在开孔率为6.3%的条件下,与阀腿高度为5 mm的H形固阀塔板进行了性能比较,另外还与... 相似文献
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采用直径1 m、板间距0.6 m的中试规模冷模塔,以空气和水为物系,对矩形导向浮阀和波纹导向浮阀组合塔板的压降进行了研究。在开孔率为15.25%的条件下,分别考察了10,25,40 m~3/(m·h)液流强度和30,50,70 mm堰高下3种组合方式的塔板压降。实验结果表明:在相同的组合方式下,堰高和液流强度的增加均会导致塔板压降的增加;在堰高和液流强度一定的条件下,弓形区域布置波纹导向浮阀,中间矩形区域布置矩形导向浮阀的组合塔板压降最低。同时文中还对3种组合方式塔板的压降进行了数学方程式拟合,其结果对塔设备设计具有参考价值。 相似文献
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《化学工程》2017,(9):24-28
在内径为600 mm的不锈钢塔内,以空气-水-氧气为物系,对固旋阀塔板的流体力学和传质性能进行研究。测定了塔板传质效率和雾沫夹带量,并与F1浮阀塔板进行对比;通过计算流体力学软件Fluent对固旋阀塔板上气相三维流场进行了数值模拟。实验结果表明:当液相喷淋密度L=5 m~3/(m~2·h)时,随着气体负荷的逐渐增大,固旋阀塔板的传质效率从小于F1浮阀到逐渐接近F1浮阀,且在实验最大气体负荷条件下超过了F1浮阀;当液相喷淋密度较大时,固旋阀塔板的传质效率高于F1浮阀塔板,且随着气体负荷的增大,差异越来越明显;固旋阀塔板的雾沫夹带比F1浮阀塔板低50%—60%,因此具有更高的气相负荷操作上限。Fluent软件模拟结果表明,固旋阀塔板中旋转流场的存在促使液层分布更均匀,气液传质得到进一步强化。 相似文献
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采用全新工艺流程,设计了一种新型双效气液并流吸收塔,塔内安装有改进型立体旋液式塔板。分别以空气、空气-水作为研究体系进行实验,考察了不同操作参数与塔板结构参数下双效气液并流吸收塔的干塔压降、湿塔压降以及立体旋液式塔板的干板压降、湿板压降,明确了双效气液并流吸收塔的操作参数范围。实验结果表明:立体旋液式塔板单板干板压降及湿板压降分别控制在70 Pa,180 Pa以内。在一效、二效各逆向安装3块塔板,全塔共完全安装6块塔板时,全塔压降最大,但是干塔压降及湿塔压降可分别控制在2 400 Pa,2 800 Pa以内,双效气液并流吸收塔与立体旋液式式塔板的组合在能耗及操作弹性方面优势明显。 相似文献
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应用Bolles理论和Klein的各项数据通过对浮阀塔板上安装2种质量不同的浮阀的压降特性进行模拟,开发了新的计算双重浮阀开启和全开时的各平衡点的表观孔动能因子公式以及建立了5个阶段计算压降的方法.对特定的条件进行了计算得到了比较合理的结果.采用各平衡点表观孔动能因子公式可以对双阀重的浮阀塔板的操作弹性有更准确的预计. 相似文献
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Jun Wang Yi‐Xuan Tang Yan‐Sheng Liu Rui Cao Tian‐Xin Chen Yu‐Feng Hu Xue‐Jun Fan 《American Institute of Chemical Engineers》2013,59(7):2694-2705
An accurate prediction of the dry pressure drop is very important for consideration of valve trays and for calculations in distillation field. Therefore, in this article, a series of hydraulic experiments were first conducted to reveal that the intermediate state during the valve opening process is closely related to the dry tray pressure drop under great valve weight. Then, a rigorous force analysis was made to show that Euler number is related only to the valve's position at the balance points for a certain valve type. Third, a new model for prediction of the dry tray pressure drop—which considers for the first time the influence of the intermediate state—was developed and then simplified for the purpose of convenient utilizations. Finally, the new model and its simplified form were tested by comparisons with the experimental results. The agreements are good, with the mean deviations being <5%. © 2013 American Institute of Chemical Engineers AIChE J, 59: 2694–2705, 2013 相似文献
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在直径为0.75 m的不锈钢塔内,以正庚烷-环己烷为物系,常压全回流条件下,进行了组合导向浮阀传质效率的研究,测试了该塔板的气、液相默弗里板效率和全塔效率,并和F1型浮阀塔板的全塔效率进行了对比。采用AIChE与Chen,Chuang 2种传质模型计算了组合导向浮阀塔板的点效率值。研究了AIChE与Molnar 2种计算涡流扩散系数的方法对默弗里板效率的影响。实验结果表明:在正常操作范围内组合导向浮阀塔板全塔效率高于F1型浮阀塔板。经比较实验值与模型值,发现采用Chen,Chuang预测点效率和Molnar方法计算涡流扩散系数所估计的默弗里板效率偏差在11%内。 相似文献
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Computational fluid dynamics (CFD) has recentlyemerged as an effective tool for the investigation of the hydraulic parameters and efficiency of tray towers. The computation domain was established for two types of oriented valves within a tray and meshed into two parts with different grid types and sizes. The volume fraction correlation concerning inter-phase momentum transfer source was fitted based on experimental data, and built in UDF for simulation. The flow pattern of oriented valve tray under different operating conditionswas simulated under Eulerian-Eulerian framework with realizable k-ε model. The predicted liquid height from CFD simulation was in good agreement with the results of pressure drop and volume fraction correlations. Meanwhile, the velocity distribution and volume fraction of the two phases were demonstrated and analyzed, which are useful in design and analysis of the column trays. 相似文献