塑料TGJ型填料的流体力学及传质性能研究

在内径φ６００ＭＭ塔中，以空气－氨－水为物系，对塑料ＴＧＪ型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、泛点填料因子、压降填料因子及传质系数等有关参数。结果表明，塑料ＴＧＪ型填料具有通量大、压降低、气液分布均匀、不易堵塞及传质性能良好等优点。     

金属IMPAC-1填料流体力学与传质性能的研究

在内径为500mm有机玻璃塔中,以空气、水为物系,对金属IMPAC-1型填料的流体力学及传质性能进行了实验研究,获得了该填料的几何特性、流体力学及传质性能数据。与INTALOX DG50相比,传质性能提高近20％以上。为方便工业应用,对数据进行了关联。     

泡沫陶瓷环形填料的流体力学和传质性能

填料是化工气液传质设备中的核心组成部分,其作用主要是为气液或液液两相提供充分的接触面,强化两相间的传质或传热过程．填料的结构和性能对填料塔的技术经济指标具有决定性的影响．陶瓷填料具有耐腐蚀、价格低廉、润湿性与热稳定性好等特点．但其加工性能差,只能做成简单形状,与其他材质的填料相比,比表面积和空隙率都比较小,流动阻力大,传质性能较差,使其应用受到了一定的限制．     

塑料星形填料流体力学与传质性能研究

在内径为100mm的填料塔内,以空气-水为物系,对新开发的塑料星形填料的流体力学和传质性能进行了测定.通过对实验数据的回归分析,推出了其填料层压降、液泛气速和液相总体积传质系数的关联式.     

金属IMPAC—1填料流体力学与传质性能的研究

在内径为５００ｍｍ有机玻璃塔中，以空气，水为物系，对金属ＩＭＰＡＣ－１型填料的流体力学及传质性能进行了实验研究，获得了该填料的几何特性，流体力学及传质性能数据，与ＩＮＴＡＬＯＸＤＧ５０相比，传质性能提高近２０％以上，为方便工业应用，对数据进行了关联。     

塑料花环填料的流体力学及传质性能研究

本实验用空气-水-氨体系,在内径为φ600 mm的塔中,对塑料花环填料进行了流体力学及传质特性的测试。结果表明花环填料通量大、压降低、在高液体负荷下具有极好的传质性能,而且耐腐蚀、不易堵塞。实验测定的塔填料因子和传质系数有设计参考意义。     

塑料花心球填料流体力学及传质性能研究

在φ600填料塔中。用空气-氨-水系统分别对φ30、φ40花心球形填料进行流体力学及传质特性实验研究。结果表明此种填料由于各向同性,对液体有良好的分散作用,其性能与同尺寸环矩鞍相当。     

聚乙烯扁环填料的流体力学与传质性能研究

在TDBY - 30 0多功能填料塔实验装置中 ,以空气 -氨气 -水为物系 ,对Φ2 5mm聚乙烯扁环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参数和ΔP/Z～Fv、H0 ～Fv、HOG～G、HETP～G及KGa～G等关系曲线。结果表明 :该填料具有压降适中、通量高、气液分布均匀及传质性能稳定等优点 ,比较适用于清洁、腐蚀性流体的气 -液吸收、精馏和萃取等传质分离工业过程     

S型规整填料的流体力学与传质性能

通过对4种不同比表面积S型金属丝网波纹填料进行冷模实验,研究分析了S型填料的流体力学和传质性能,并把其性能与同比表面积的金属丝网波纹填料进行了对比。研究表明,S型填料具有较小的塔压降,当F =1.2 (m/s)·(kg/m³)^0.5时,S800的干塔压降比CY800降低了40.02%;当F =1.2 (m/s)·(kg/m³)^0.5、L=25.46 m³/(m²·h)时,S800的湿塔压降较CY800降低了78.18%。S型与CY型填料相比具有较大的液泛气速,S800的液泛气速较CY800增加了22.22%以上;另外,S型填料具有较高的传质效率,S800型填料的理论级数每米最高可达到20块/m,当L=25.46 m³/(m₂·h),F≤1.5 (m/s)·(kg/m³)^0.5时,S800的理论级数较CY800提高了12.33%以上,传质效率较传统填料有很大程度的提高。S型填料的流体力学和传质性能均较好,能同时满足高通量、低压降、高效率等生产要求,有很好的应用前景。     

阶梯环填料层流体力学和传质性能研究

本文研究了16 mm聚丙烯阶梯环填料层的压强降和液流的分布特性,研究了液相传质性能。获得了压强降填料因子、泛点填料因子,以及液相真实传质单元高度的关联式。结果表明,阶梯环填料对液体分布的保持性能好,分散常数C值比同尺寸的拉西环大23.4％;传质单元高度比同尺寸的拉西环低20～45％。     

表面改性塑料填料流体力学及传质性能研究

采用新的塑料波纹填料改性方法,有效改善填料成膜性,与同等条件下商业填料进行对比。采用氧解析实验,在直径190 mm的有机玻璃塔内,液相喷淋密度10—36 m3/(m2·h),F因子0.2—3(m/s)·(kg/m3)0.5的实验条件下测定了改性填料及商用填料的流体力学及传质性能。实验结果表明:当液体喷淋密度为10,24,36 m3/(m2·h)时,在相同的F因子下,改性填料的液相传质单元高度Ho L较商用填料分别降低了29.50%,23.00%以及23.95%,同时改性后压降也相应为商用填料的85.37%,89.71%和88.35%。表明该改性方法在低喷淋密度下对塑料填料性能提升显著。此外,对实验填料的Ho L、压降进行了关联,采用狭通道液膜波动理论对填料塔内部液泛进行了探讨,为塑料填料的工业应用提供了设计基础。     

泡沫碳化硅波纹规整填料的流体力学及传质性能

将碳化硅陶瓷材料用于精馏过程,将该材料与波纹板类填料形状相结合开发出泡沫碳化硅波纹规整填料和光滑碳化硅波纹规整填料.对2种填料进行了流体力学性能与传质性能的测试,研究了泡沫结构对规整填料性能的影响.在直径100mm的有机玻璃塔中使用空气-水体系对填料进行干填料压降、湿填料压降、泛点气速、持液量等流体力学性能测试;在直径100mm的常压玻璃塔中,使用环己烷-正庚烷标准物系进行全回流操作,对填料进行传质性能测试.实验结果表明,在填料外形相同的情况下,与光滑填料相比,泡沫填料的干、湿填料压降较高,泛点气速相当,持液量增大,传质效率显著提高.     

Hydrodynamic and mass transfer efficiency of ceramic foam packing applied to distillation

In addition to a high void volume and specific area, solid foams possess other properties (low density, good thermal, mechanical, electrical, and acoustical behaviour) that make them attractive for applications such as heat exchangers and reformers. Applications using foams as catalysts or structured catalyst supports have demonstrated higher performance than classical catalysts. Several studies have explored the hydrodynamic behaviour of foams in monophasic and countercurrent systems and have reported very low pressure drops. This paper describes the application of ceramic foam to distillation. The β-SiC foam contains 5 pores per inch (PPI) with a 91% void volume and a surface area of 640 m²/m³. Performance parameters including pressure drop for the dry and wet packing, flooding behaviour, and dynamic liquid hold-up were measured in a column of 150 mm internal diameter. The mass transfer efficiency in terms of the height equivalent to theoretical plate (HETP) was determined by total reflux experiments using a mixture of n-heptane and cyclohexane at atmospheric pressure. The experimental results were used to develop a set of correlations describing pressure drop and liquid hold-up in terms of a dimensionless number. The hydrodynamic performance and mass transfer efficiency were compared with classical packing materials used in distillation.     

Experimental and numerical study of mass transfer efficiency in new wire gauze with high capacity structured packing

ABSTRACT

Experimental and numerical studies were conducted on the mass transfer efficiency of new wire gauze structured packing. For serving this purpose, various operational conditions were studied to assess the optimal parameters such as HETP of PACK-2100 in the distillation column. The results indicate that the HETP values are enhanced in comparison to conventional ones. In addition, the HETP slowly increases from 4 to 6 cm as mass flow rates of air and liquid flow are increased. The numerical simulations were also performed to describe the performance of the PACK-2100. The Eulerian-Eulerian multiphase approach is applied to calculate the value of HETP and pressure drop. The computational results confirmed that our experimental results. The average relative error between CFD predictions and the experimental data for the prediction of mass transfer efficiency is 20.45%.     

Investigation of hydrodynamic performance and effective mass transfer area for Sulzer DX structured packing

The hydrodynamic performance in terms of pressure drop (?P) and liquid holdup (h_L), and tshe effective mass transfer area (a_e) of Sulzer DX structured packing were investigated at 293.15 K and 101.3 kPa. In addition, the flooding velocity (u_F) was also calculated based on the experimental results of liquid holdup, and the effective voidage correction factor (?) was obtained by combining the Billet model and the experimental effective fraction. The liquid volume method and pressure difference from just below to above the column packing approach are used to describe the hydrodynamic performance in a structured packing column. Experimental results showed that the operational conditions in terms of gas flow rate, liquid flow rate, viscosity, and liquid systems strongly affect the hydrodynamic performance. The experimental comparison between the pressure drop profiles in air‐water (polyethylene oxide [PEO]) and MEA‐H₂O‐CO₂ systems indicated that both the reacting MEA and CO₂ partial pressure can enhance the pressure drop value. In addition, the Bain‐Haugen correlation model was developed to predict the flooding velocity data with an acceptable AARD of 8.1%, and a model was also successfully proposed to predict the values of liquid holdup with an AARD of 11.8%, which is lower than 14.7% in Billet model. Furthermore, the effective mass transfer area was found to be increased by increasing both the liquid and gas flow rate by using NaOH‐H₂O‐CO₂ system. A model was also proposed to calculate the experimental a_e with an acceptable AARD% of 19.52, and this built model (Eq. 39) can reasonably explain the experimental phenomenon. © 2018 American Institute of Chemical Engineers AIChE J, 64: 3625–3637, 2018     

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。     

新型网架规整填料的传质性能

对一种新型网架规整填料用于萃取时的传质效率进行了实验研究。在Φ50mm的填料萃取塔中,选用煤油–苯甲酸–水和30%TBP(煤油)–乙酸–水两种不同界面张力的物系,测定了该填料和Φ10mm的鲍尔环填料在不同操作条件下的表观传质单元高度。扣去影响因素,网架填料的表观传质单元高度至少会比鲍尔环填料低25%,而网架填料的堆积密度仅为鲍尔环的38%。同时对影响传质的因素进行了分析,并针对该填料的特点,提出了优化设计原则。     

交错型开窗导流填料的流体力学性能

为了提高规整填料通量,对传统开窗导流填料结构进行改善,提出一种新型交错式开窗导流填料。在不同喷淋密度下,采用空气-水系统对3种不同交错高度的开窗导流填料进行冷模实验,研究分析了其流体力学性能,并与传统开窗导流填料进行对比。实验结果表明:新型交错规整填料的压降随着喷淋密度的增加而增大,填料盘的交错式结构有效降低塔压降,提高通量,改善气液分布。与传统开窗导流填料相比,3种新型填料盘的干塔压降、湿塔压降显著降低,液泛气速显著提高。其中180-20型填料的压降降低最为显著,220-20型填料的液泛气速最低。同时,在LEVA模型和Bain-Hougen模型的基础上,获得了实验条件下干塔压降、湿塔压降和液泛气速的关联式,其计算结果与实验数据吻合较好。