高效导向筛板在26万t/a聚氯乙烯低沸精馏塔中的应用

基于26万t/a聚氯乙烯低沸塔板分离能力低下,介绍了大通量导向筛板在聚氯乙烯低沸精馏塔技术改造中的应用,分析了其结构特点,研究了该筛板操作性能.用化工过程模拟软件对改造方案进行了计算机模拟与优化,在优化方案的基础上对设备进行了改造.结果表明,大通量导向筛板和原传统塔板相比,生产能力、分离效率均有明显提高,而能耗显著降低.     

大通量导向筛板与BHSⅡ型高效填料的研究与应用

介绍了大通量导向筛板与BHSⅡ型高效填料在工业上甲醇精馏塔技术改造中的应用,阐述了其结构特点,研究了其操作性能。用先进的化工过程模拟软件对改造方案进行了计算机模拟与优化,在优化方案的基础上完成了技术改造。结果表明,大通量导向筛板与BHSⅡ型高效填料的结合应用和原泡罩塔板相比,生产能力是原来的近两倍,分离效率明显提高,而能耗则显著降低。     

高效导向筛板的研究开发及其工业应用

介绍了高效导向筛板的研究开发思路,阐述了其结构与特点,并详细介绍了高效导向筛板在石油、化工领域的推广应用情况。高效导向筛板具有生产能力大、分离效率高、塔压降低、 抗堵性强、造价低廉、拆装方便等特点,具有适应于现代化工大通量、高效率、低能耗生产要求的优越性与广阔的市场推广前景,在实际应用过程中取得了巨大的经济效益、社会效益及环境效益。     

用高效导向筛板改造Φ800甲醇回收塔

对维尼纶厂原有的Φ８００甲醇回收塔进行了标定，对塔的几种改造方案作了模拟对比和优化。用高效导向筛板塔替代了原有塔型，达到了较高的工艺指标，工业运行非常成功。     

高效导向筛板塔的特点及其工业应用

分离过程是化工生产工艺中的重要组成部分，塔设备是主要的化工分离设备。随着化工生产的发展，高效率、大通量、低能耗分离技术越来越受到人们的重视，高效导向筛板就是适应这种趋势而开发出来的新型塔板。     

高效导向筛板对聚合一塔的技术改造

用先进的化工过程模拟软件对物料粘度为 1 0～ 50Pa·s的聚合一塔技术改造方案进行了计算机模拟与优化。采用高效导向筛板对其进行改造后 ,塔釜醋酸乙烯组成由原来的 0 2 6 %降至 0 0 3 % ,醋酸乙烯吹出率达到 99 85～ 99 90 % ,回流比由原来的 1 3左右降至 0 85左右 ,节能约 2 5 %     

新型高效导向筛板的研究与应用

对高效导向筛板的结构进行改进和优化,开发出新型高效导向筛板.介绍了高效导向筛板实验研究内容和方法,以及工业应用实例.应用表明,高效导向筛板具有生产能力大、分离效率高、板压降低、抗堵性能好、塔板造价低等优点.     

高效导向筛板对聚合一塔的技术改造

用先进的化工过程模拟软件对物料黏度为10 000～50 000 cp的聚合一塔技术改造方案进行了计算机模拟与优化.采用高效导向筛板对其进行改造后,塔釜醋酸乙烯组成由原来的0.26%降至0.03%,醋酸乙烯吹出率达到99.85%～99.9%,回流比由原来的1.3左右降至0.85左右,节能约25%.技术改造后年增经济效益超过277万元.改造的设备投资回收期为两个月.     

导向筛板在脱醛塔改造中的成功应用

对脱醛塔的改造方案进行了计算机模拟与优化，选用通量大，效率高，压降低的导向筛板对该塔进行技术改造，改造后操作稳定，生产能力增大５０％，回流比和能耗降低约５０％，提高塔顶产品收率约一倍。改造的全部投资回收期不到１．５个月。     

垂直筛板塔的工业应用简介

1 前言 垂直筛板(New VST)是塔器中的一种新型塔板结构。它是气相为连续相、液相为分散相的高效喷射型塔板,与浮阀、筛板、泡罩塔板相比,它具有高效率、大通量、低压降等优点。因而具有广泛的工业应用前景。 就塔板与降液装置而言,New VST与浮阀、筛板、泡罩塔板并无太大不同,其主     

Performance and applications of flow-guided sieve trays for distillation of highly viscous mixtures

With a particular focus on the distillation of highly viscous or self-polymerized mixtures, this study reports the hydrodynamic and mass transfer performance of two flow-guided sieve trays, including their pressure drop, entrainment, weeping and tray efficiency, obtained experimentally with an air-water/oxygen system in a Φ600 mm plexiglass column. The results show that the 8 mm hole flow-guided sieve tray tested shows better characteristics than the 7 mm flow-guided hole tray in terms of pressure drop and mass transfer. Then we present practical industrial examples of applications of the flow guided trays for distillation of viscous mixtures, i.e., the separation of vinyl acetate (VAC) from a polyvinyl acetate (PVAC) polymer solution with dynamic viscosity μ=50,000 mPas, the separation of highly unsaturated C5 mixtures by extractive distillation, and the distillation of thick, condensed and highly viscous fermentation mixtures made from fermented mash. It is demonstrated that flow-guided sieve trays with relatively large holes are an excellent candidate for distillation of mixtures with suspended solids, or concentrated/self-polymerized polymer solutions.     

高效导向筛板的研究与应用

详细介绍了高效导向筛板的结构,指出其在机械结构上有两项改进,即导向孔和鼓泡促进器,这大大提高了塔板的性能。研究了高效导向筛板的加工过程及分离效率,并给出了其在PVC工业中的应用实例。     

Predicting valve tray efficiency

Existing literature models for predicting the mass transfer efficiencies of binary hydrocarbon, distillation columns employing moving valve trays are evaluated. Only four models for predicting valve tray efficiencies exist in the open literature. All of these models use data from valve trays. The last theoretical model was published in 1972, 42 years ago. By comparison, sieve tray efficiency models are numerous and recent. Sieve tray models were developed from large databases. There are no valve tray equivalents to the fundamental mechanistic models available for sieve trays. Despite the differences between valve and sieve trays, many of the phenomena on sieve and valve trays are similar. Consequently, sieve tray models can be employed to provide estimates for valve trays. In this work, using public FRI data on round moving valves, the performance of the Chen and Chuang sieve tray mechanistic model is compared to the performance of four valve tray models. It appears that, in the absence of fundamental (and qualified) valve tray models, the sieve tray models present a potential alternative for valve tray efficiency predictions.     

Hydraulic,mass transfer and heat transfer performance comparison between ordered bed packing and sieve trays

The Girdler–Sulfide (GS) heavy water production process has traditionally used tray columns because of their large size. In recent years, the chemical industry has extended the use of packing to larger columns because of economic and performance advantages. A pilot scale study was thus initiated to compare the hydraulic, mass transfer and heat transfer performance of an ordered bed packing (Mellapak) with sieve trays operating under GS process conditions. Mellapak offered lower pressure drops, higher throughputs and improved heat transfer over sieve trays. However, benefits to deuterium mass transfer were only marginal in large diameter columns.     

大孔筛板流体力学性能研究

本文测定及研究了大孔筋板(孔径为 5、10、15、20及25mm)流体力学参数,提出计算塔板压降、漏液点气速、零沫夹带量及泡沫层高度的一套设计关联式,其精确度可满足工程设计的需要.文中还对大孔筋板的操作性能及弹性范围进行了分析讨论.对于塔板结构参数设计得当的大孔筛板,操作弹性比达到2—4左右,足可适应一般工业装置的负荷波动要求.     

Determining the gas content of the liquid on bubble trays

Gas bubbling on sieve and grid trays is considered. From the energy balance for the bubbled layer, a theoretical equation is derived for calculating the average gas content of the liquid on the trays of a bubble column. The data calculated using this equation are compared with experimental data available on the average gas content of the liquid on sieve and grid trays for water-gas and organic liquid-gas systems. The equation is compared with some empirical and theoretical relationships.     

筛板上两相流的检测——热膜流速仪的应用

介绍了用热膜流速仪对精馏筛板上气液两相流的检测工作,讨论了适合于筛板上气液两相流测定的热膜流速仪检测信号的识别和标定方法,给出了筛板上两相流流场和气含率的测定结果。     

Mass transfer modelling for GS heavy water plants: Part II: Tray efficiency on GS sieve trays

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.     

Separation of Bovine Serum Albumin by Foam Fractionation with Sieve Tray Column

A batch foam fractionation column with sieve trays was developed for enhancing the foam drainage. Effects of feeding concentration, air flow rate, number of stages, and sieve pore size on foam fractionation performances were investigated. The results indicated that the sieve trays enhanced the foam drainage effectively and improved enrichment ratio. At the liquid loading volume 490 mL, feeding concentration 0.1 g L^?1, and air flow rate 300 mL min^?1, the enrichment ratio reached 7.56 by using 10 stages of sieve trays with opening ratio of 38.25%, which was 1.84 times of that obtained by the control column.