2 . the rigorous thermodynamic model has been applied to study the characteristics of cryogenic distillation column having feedback stream with hydrogen isotope system in steady state 2 、应用严格的热力学模型研究了带有侧线循环及平衡反应装置的氢同位素低温精馏塔的稳态分离特性。
One of the main aspects of research on distillation column with trays is the fluid field and mass transfer on the trays by the method of computational fluid dynamics ( cfd ) <中文摘要> =在蒸馏设备中，板式塔研究的一个重要方面就是应用计算流体力学对塔板上流体流动状况及传质过程的研究。
Next , the air enters a high pressure distillation column where it is physically separated into a vaporous form of nitrogen at the top of the column and a liquid form of “ crude ” oxygen ( ~ 90 % o2 ) at the bottom 随后空气进入高压分裂蒸馏塔，分离成氮蒸气和“原始”液氧（含大约90 %的氧） ，氮蒸气在蒸馏塔顶部，液氧在蒸馏塔底部。
A controlling method of total reflux by introducing temperatures of middle part and top part in batch distillation column was set up , and isopropanol and n - propanol were used to conduct the experimental study of this operation 摘要提出了采用塔顶和塔中温度进行控制操作状态转换的全回流间歇精馏控制方法，并以异丙醇正丙醇为实验物系进行了实验研究。
Whether the fluid of coarse liquid zinc is steady or not is one of the most important factors that effect the life of distillation column and the output and quality of product meanwhile , it also much affects the recovery rate of valuable metals 粗锌液流量稳定与否，是影响精馏塔寿命以及锌产品产量和质量的最重要因素之一；同时，它对有价金属的回收率也将产生很大的影响。
Thus it is possible to obtain products ranging from gaseous materials taken off the top of the distillation column to a heavy residue or “ bottom ” , which is usually nonvolatile , with correspondingly lighter materials taken off at intermediate points 由此，我们有可能获得石油产品，这些产品包括从蒸馏塔顶部得到的气态物质，包括比重较大的渣油或称“残渣” (一般而言挥发性较差) ，以及从蒸馏塔中部得到的比重较小的其他相应物质。
A side stream is recycled to the external feed stream of the column through an equilibrator as an internal feed stream . the simulation results indicate effects on the characteristics of cryogenic distillation column . consideration is given to the behavior and characteristics of the set of ordinary differential equations 3 、分析了浓度极稀物系动态精馏模型的特点，建立了此类物系动态模型的求解策略，通过对模型中状态变量的转换，使原本刚性较强的微分方程组转化为一非刚性的常微分方程组。
The finite volume method and the star - cd software are used to compute the fluid flow process and mass transfer process of one tray and for the first time of the whole distillation column ( 10 trays ) under the total reflux . the computed results are as follows : 1 . since the previous research did not show the comparison between the computational results and the measured values of 3d fluid field on a distillation tray , attention is paid to present work in this paper 本文采用有限体积法及计算流体力学软件“ star - cd ”对单块板以及首次对全回流下的全塔（十块板）流体流动、传质过程进行了计算，计算结果如下： 1 .泡沫工况下单块板的流场计算值与solari及bell ( 77 (的实测值吻合较好。
