共查询到20条相似文献,搜索用时 125 毫秒
1.
用计算流体力学方法研究转盘塔内的流场 总被引:2,自引:1,他引:1
利用计算流体力学(CFD) 方法, 以水为连续相, 对三种不同规模的转盘萃取塔(RDC)内的单相流动的流场进行模拟。计算结果表明, 随着塔径的增加, 级内混合减弱, 级间的返混增加。对于φ2 .4 m 的工业转盘塔, 存在约50 % 的径向死区以及20 % 左右的轴向死区。 相似文献
2.
3.
4.
5.
6.
我厂原是两套铜洗 ,1套70 0系统 ,1套60 0系统 ,只能开 1 2台 4M 8( 3)氢氮压缩机 ,6万吨合成氨 /年。由于系统能力偏小 ,工艺和设备落后 ,只要脱碳CO2 和变换CO指标稍高或系统负荷稍有波动 ,就会引起精炼气微量 (CO2 +CO)超高 ,甚至带液 ,严重影响生产的稳定以及产量的提高。 2 0 0 0年 1 2月 ,新建 1套1 2 0 0铜洗装置 ,取代原70 0和60 0铜洗系统 ,并采用新型塔内件和高效不锈钢规整填料 ,半年多的生产实践证明 ,各项指标运行良好 ,经济效益显著。1 技改措施我国合成氨厂铜洗塔绝大多数以散堆型填料塔为主 ,近几年来 … 相似文献
7.
萃取塔因生产能力大、占地面积小、密闭性好等优点,在石油、化工、生物、医药和环境工程等多领域被广泛应用。本文从以下几个方面介绍了萃取塔近些年的研究进展:综述了传统萃取塔(脉冲萃取塔、转盘塔与Kühni塔等)的水力学、轴向扩散与传质模型的发展,分析比较了表面张力、传质方向、放大效应等因素对模型的影响;介绍了计算流体动力学(CFD)在萃取塔中单液滴、单相流模拟、液-液两相流模拟、外加能量模拟、与群体平衡模型(PBM)耦合模拟中的应用进展;介绍了国内外设计开发的新型萃取塔,包括改变传统塔的内构件和引入多种外场能量等方式来强化相间传质。研究表明,将先进实验研究方法、准确经验模型和可靠理论计算相结合,将会是萃取塔研究的重要手段和方向。 相似文献
8.
9.
10.
11.
运用正交试验法设计了横纹槽管结构优化的试验,试验运用数值模拟方法进行,采用标准K-ε方程湍流模型和速度分布两层模型进行模拟计算,研究了横纹槽管结构参数e/d,p/d, a/e和流动Reynolds数对热阻力性能的影响.试验结果表明:在试验参数范围内,影响横纹槽管综合传热性能的主要结构参数为肋节距p/d和肋形a/e,而肋高e/d影响较小,并且传热综合因子随流动Reynolds数增大而迅速降低.通过分析正交试验结果,提出了较佳横纹槽管管型. 相似文献
12.
Perfluorocyclic oxide is proposed as an antisolvent for studying the behaviour of binary systems by liquid-liquid equilibrium. The experimental results, obtained for the ternary systems perfluorocyclic oxide — hydrocarbon — propionitrile, are correlated with the NRTL equation. The values of NRTL parameters allow the prediction of the behaviour of ternary systems hydrocarbon A — hydrocarbon B — propionitrile. The use of liquid-liquid extraction with mixed solvent (perfluorocyclic oxide and propionitrile) is suggested for the separation of hydrocarbon mixtures. 相似文献
13.
Lauge Fuglsang Nielsen 《Cement and Concrete Research》1977,7(2):149-160
The article demonstrates that the concept of separating the reversible creep part from the creep function of concrete is very useful, theoretically as well as practically. The demonstration is carried out indirectly by using the concept in developing a new method of analysis, the results of which are successfully compared with experimental data. Contrary to some other methods an analytical conversion is possible between the three principal forms of the stress-strain relation. By simplifying the method the simple Improved Dischinger equation — previously developed by the author — is derived. It is shown that also the Improved Dischinger equation agress well with experimental results — except (as expected) for some time (approx. 2 months) after large load jumps. Thus the two Modified Dischinger methods represent two levels of accuracy and mathematical complexity. 相似文献
14.
15.
我国云南有一个钾石盐矿藏。上海化工研究院在溶解结晶法方面做过许多工作,文章简要地进行了介绍。文章详细叙述了溶解结晶法的典型流程,作为比较的依据,然后介绍了全溶法、部分溶解法、半溶法和常温溶浸流程的主要实验结果。通过比较,作者认为用溶解结晶法加工云南钾石盐,适宜的方法是部分溶解法,而半溶法也有希望。 相似文献
16.
The ground-state reaction of Cl + CHD3 was studied with joint experimental and theoretical efforts. Experiments were performed under crossed-beam conditions using a time-sliced velocity imaging detection method. By taking the images over the energy range of chemical significance—from threshold to about 9 kcal/mol—the reactive excitation functions as well as the dependence of product angular distributions and of the energy disposal on initial collision energies were obtained for both isotopic product channels. Theoretically, reduced dimensionality quantum dynamics calculations were performed for the HCl + CD3 channel, and the results are in excellent agreement with experimental findings. Comparisons with previously reported results on Cl + CH4/CD4, both experimental and theoretical, were also made to gain deeper insights into the dynamics of this benchmark atom + polyatomic reaction. 相似文献
17.
18.
《分离科学与技术》2012,47(14):1805-1821
Abstract A nonequilibrium stage model is used to predict composition profiles for binary and multicomponent distillation in a column of spheres and cylinders with a known interfacial area. The profiles generated by the model are compared with experimental data for the binary systems methanol—isopropanol, methanol—water, and isopropanol—water, and for the ternary systems methanol—isopropanol—water and acetone—n—hexane—cyclohexane. The model predicts with a high accuracy the experimental data with an average deviation lower than 1 mol%. 相似文献
19.
The results of the investigations of conversions occurring during synthesis of aluminum oxide and zirconium dioxide porous fibres with alloying additions in the temperature range from 20 to 1300°C are presentated. The analysis of the experimental results enabled to reveal features typical for pyrolitic conversion and sintering of aluminum oxide — and zirconium dioxide — base ceramic fibres. 相似文献
20.
在30℃和80~95 r.min-1的条件下,利用摇瓶试验探讨了弹性填料(YDT)和竹子作为填料对污泥为主要碳源的系统反硝化特性和机理。试验结果表明,以污泥/竹子系统中NO3--N的去除速率最大(2.51 g.m-.3h-1),其次是污泥/YDT系统(1.30 g.m-.3h-1),最后是污泥系统(0.53 g.m-.3h-1);而NO2--N积累量也呈现一定的趋势(以每去除1 g NO3--N计算):污泥/竹子系统最高、污泥系统次之、最后是污泥/YDT系统;污泥特性是决定系统反硝化效果的主要因素。然后以污泥/竹子系统进行深入了研究发现,水温对污泥/竹子系统的反硝化过程具有较为显著的影响。 相似文献