矩鞍型填料的流体力学计算

矩鞍型填料(即“英特洛克斯鞍”,Intalox saddles.见图1)是一种乱堆的敞开型实体填料。该填料由于其形状的特点,强度高,装在塔内时稳实性较好,並能减轻沟流现象,使填料表面的利用率较高,因此与拉西环相比,具有压降小、处理能力大及效率高等优点。这种填料目前在国外已被广泛地应用于工业生产上,包括大型合成氨厂中的二氧化碳吸收塔     

塑料异型矩鞍填料的流体力学及传质性能研究

在内径300 mm塔中,以空气-氨-水为物系,对开发出的一种新型塑料散装填料———异型矩鞍填料的流体力学及传质性能进行了研究。获得了该填料的几何特性、流体力学性能及传质性能数据,并通过对实验数据的回归分析,得出了填料层压降Δp/Z、泛点填料因子F及气相总传质单元高度HOG的关联式。研究结果表明,塑料异型矩鞍填料具有通量大、压降低、气液分布均匀及传质性能优良等优点。     

Dg50改进型陶瓷矩鞍填料的流体力学性能

本文报导了Dg50改进型陶瓷矩鞍填料的流体力学性能的测试结果,并对填料的流体力学现象等作了分析讨论。提出了一种简便可靠的计算干填料比表面积的方法。     

新型导向孔板波纹填料流体力学性能研究

以空气-水物系为介质在Φ400 mm的有机玻璃塔中分别测定了250DY型导向孔板波纹填料和传统250Y型孔板波纹填料的流体力学性能。实验结果表明:250DY型填料与250Y型填料相比,其干填料压降降低了40%,湿填料载点前压降降低了37%—42%,泛点气速提高了24%—33%;由于250DY型填料在结构方面的改进,使该填料在降低压降,增加通量方面具有明显的优势。此外,运用单纯形法对250DY型填料的流体力学实验数据进行关联,得到了压降和泛点气速的合适关联式,为该填料的工业应用计算提供了依据。     

矩鞍形填料萃取塔的研究

<正> 一、前言: 随着萃取过程的研究与开发,尤其在石油、化工、医药、食品等工业上日益广泛的应用,证明了液——液萃取在许多领域具有重要作用。作为实现两液相之间质量传递的萃取设备,目前在工业上采用的已达三十余种。各种设备具有不同的特性,而且萃取过程及萃取体系中各种因素的影响也是错综复杂的。对一个理想的工业萃取设备来说,应该具有: 1.通量大,即单位时间、单位塔截面上的物料处理量要大;     

新型填料结构旋转床流体力学特性

以空气-水为工作介质,研究了填料特性、超重力因子、气体流景和液体流量等对不同填料结构旋转床床层压降特性的影响.实验结果表明,离心压降、干床压降、湿床压降与填料的材质、板间距、空隙率等密切相关;床层压降随超重力因子、气体流量的增加而增大,与液体流量几乎无关;在相近的操作条件下,床层压降与文献报道丝网错流旋转床的相近,为逆流床的十分之一;运用最小二乘法对实验数据回归得出了干湿床压降的关联式,计算的干湿床压降与实验值的平均误差小于15%.     

新型板网填料传质性能的研究

在５００ｍ ｍ 冷模实验塔内对２５０ Ｙ 型填料进行氧解吸试验,结果表明三层板网复合填料的分离效率明显高于单层板网填料,尤其在液气比低的工况下,效率可以倍增,和广泛应用的金属 Ｍｅｌｌａｐａｃ填料相比,板网复合填料的分离效率能高３０％ 左右。     

新型垂直板规整填料流体力学及传质性能

采用氧解吸实验,在直径190 mm的有机玻璃塔内,液相喷淋密度10～38 m³·m^-2·h^-1,F因子0.2～3.2 m·s^-1·（kg·m^-3）^0.5的实验条件下测定了一种新型垂直板规整填料的流体力学及传质性能。实验结果表明：垂直板填料的操作压降及传质性能均显著优于商业波纹填料。通过与几种经改进的250型波纹填料相比发现,两者泛点F因子整体上相当;在较高液体喷淋密度下,垂直板填料传质性能及压降均高于改进250型波纹填料;在低喷淋密度下,垂直板填料可实现压降低于改进250型波纹填料,而两者传质性能相当。此外,对填料结构改进对其性能的影响进行了单因素考察。     

φ76毫米聚丙烯鲍尔环和矩鞍形填料流体力学性能测试

在φ1000毫米有机玻璃试验塔内用空气-水系统对浙江嘉兴塑料加工厂生产的φ76聚丙烯鲍尔环和φ76聚丙烯矩鞍形填料进行了流体力学研究,并对其流体力学性能进行了比较,结果表明鲍尔环的流体力学性能优于矩鞍形填料。     

INTALOX(环矩鞍)填料性能研究

本研究采用空气—氨—水系统,在直经分别为600和300mm塔中,水的喷淋密度0～80m~3/m~2h,气体空塔速度0.4～3m/S的状况下,对美国Norton公司的企属Intalox填料的流体力学及传质性能进行了实验测定,并与国内同类填料进行了比较。结果表明这种填料具有通量大、效率高、压降小和能耗低等优点。本文所提供的数据是在接近工业生产操作条件下取得的,可供工程设计方面参考。     

Computational Fluid Dynamics Characterization of High-Capacity Structured Packing

The novel wire gauze structured packing, PACK-860, was characterized by means of numerical methods. The main features of PACK-860 such as height equivalent to a theoretical plate (HETP) and dry/wet pressure drop were evaluated. The flow structure in this packing was described by numerical simulation. To estimate the amount of HETP and dry/wet pressure drop, three-dimensional computational fluid dynamics (3D CFD) modeling with the Eulerian-Eulerian multiphase approach was applied. The average relative errors between the results obtained from CFD simulation and experimental findings for mass transfer efficiency and wet and dry pressure drop were assessed. Numerical observations were found to agree well with the empirical results, proving the reliability of CFD simulations for modeling separation processes.     

换热管流体激振的动力学特性及稳定性分析

对于换热管受横向流激振产生振动的问题,考虑流体阻尼与管道变形的影响,得到了关于振动速度的高阶偏微分方程。以弹簧-质量系统作为方程的特解入手,分析了热管振动方程解的形式和对应的动力学特性,并作出对应的相轨线方程,从相平面的角度出发,进一步得出换热管受流体激振的稳定性条件。     

内弯弧形筋片扁环填料的特点和应用前景

内弯弧形筋片扁环填料是一种结构新疆，性能优异的高效填料，获国家发明专利系统的实验研究和工业应用表明，这种填料的性能优于多种国外引进的新型填料，可望在石油炼制，化工，湿法冶金和医药等领域的萃取，精馏和吸收等过程中获得更广泛的应用。     

国产脉冲填料性能研究

在直径为262 mm有机玻璃塔内,用空气一水体系对国产50 mm陶瓷脉冲填料进行了流体力学性能的测试,得出了干、湿填料压降,载、泛点气速关联式。以Na_2SO_3溶液在钻离子催化下用空气氧化法测定了液相传质系数和有效表面,并对有效表面、载点气速提出了新的关联式。试验结果表明,国产脉冲填料与西德产脉冲填料一样,具有良好的流体力学性能和传质性能。     

Characterization of a New Structured Packing by Computational Fluid Dynamics

The novel wire gauze structured packing PACK‐1300Y with high specific surface area was characterized by computational fluid dynamics. The main features of PACK‐1300Y were investigated including the dry and wet pressure drop as well as the height equivalent to a theoretical plate (HETP). Moreover, the flow structure of this packing was described via numerical simulations. To evaluate the amount of HETP and dry and wet pressure drop, 3D computational fluid dynamic modeling with respect to the Eulerian‐Eulerian multiphase approach was applied. The average relative errors were determined between the findings achieved from computational fluid dynamic simulation and experimental findings for mass transfer efficiency and wet and dry pressure drop, respectively.     

斜瓣式止回阀启闭过程的动态特性分析

为加速实现先进压水堆用斜瓣式止回阀的国产化,提升我国核电业的自主开发能力,利用动网格技术模拟研究了斜瓣式止回阀阀瓣启闭过程中的动态响应特性.结果 表明:低于50％THA(热耗率验收)工况下,增加工况参数对启闭时间、最大角速度和阀瓣受到的最大压力的提升效果较小;止回阀管道的流量应高于1.5％THA工况下的流量,以避免阀瓣...     

压延孔板波纹填料性能研究

本文阐述了利用压延孔薄片制成的新型高效低阻力精馏填料的特性,给出在100mm塔径中用甲基环己烷-甲苯及乙醇-水两种不同体系在大气压下精馏的试验数据。由于压延孔薄片上的孔刺具有毛细作用,能使碳氢化合物或醇的水溶液自动地分散于其表面使填料润湿,因此汽-液之间能迅速达到平衡,显著地节约精馏操作的起动时间。 由于填料可由比较价廉的金属薄片制成,因此比用金属丝网制成的填料价格低廉。 实验数据还表明这种新型填料的等板高度为111—172mm,每块理论板的压阵为2.7—3mmH_2O随气体负荷F因子由1.22至2.25而异。 因此这种新型填料应用于真空精馏方面也是很有发展前途的。     

Computational Fluid Dynamics Simulation of 13CO Distillation in Structured Packing

Physical 3D models were established for corrugated packing used in the enrichment of the isotope ¹³C. Computational fluid dynamics (CFD) simulation results indicated that common corrugated packing was not well wetted when used for isotope distillation. It is concluded that liquid misdistribution in the packed tower results from the structure of the packing rather than from the height of the packing beds. The existence of entrainment was also demonstrated by CFD simulation. It is proved that mass transfer equations based on the Nusselt theory are not suitable for distillation calculation in such a corrugated packing system. By comparison, the recently developed structured packing model with a corrugation geometry based on the right‐angled triangle, known as Zigzag‐pak, describes vapor‐liquid distribution properties well and has significant advantages over common corrugated packing due to its better liquid distribution character.     

蒸汽发生器支撑板表面流体薄膜动态特性分析

对蒸汽发生器支撑板表面流体薄膜的动态特性进行了分析。使用有限元分析软件ANSYS研究了支撑板的固有频率、开孔半径、压力、流体薄膜厚度和流体粘度等因素对支撑板刚度系数和阻尼系数的影响。通过分析得出了刚度系数和阻尼系数与影响因素之间的关联式。     

液膜性质的小尺度研究

Structured packing is a good candidate for CO₂ capture process because of its higher mass transfer efficiency and lower pressure drop.Now,the challenging problem of CO₂ capture and storage demands more and more efficiency equipment.The aim of the present study is to investigate the liquid film characteristics under counter current gas phase and throw some insight into the enhancing mechanism of mass transfer performance in structured packing.A high speed digital camera,non-intrusive measurement technique,was used.Water and air were working fluids.Experiments were carried out for different gas/liquid flow rates and different inclination angles.The time-average and instantaneous film widths for each set of flow parameters were calculated.It is shown that the effects of gas phase could be neglected for lower flow rate,and then,become more pronounced at higher flow rate.According to instantaneous film width,three different stages can be distinguished.One is the constant width of liquid film.The second is the slight decrease of film width and the smooth surface.This kind of character will lead to less interfacial area and deteriorate the packing mass transfer performance.For the third stage,the variation of film width shows clearly chaotic behavior.The prediction model was also developed in present work.The predicted and experimental results are in good agreement.