旋转填料床最新研究进展

本文对旋转填料床的研究进展进行了评述,具体介绍了几种常见和新型的旋转填料床工作原理并进行了对比,最后对旋转填料床的发展趋势与侧重点做了简要分析。     

超重力旋转填料床最新研究进展

本文对旋转填科床结构的研究进展进行了评述,具体介绍了几种常见和新型的旋转填料床工作原理并进行了对比,最后对旋转填料床的发展趋势与侧重点做了简要分析.     

错流旋转填料床气相压降特性

旋转填料床的气相压降是旋转填料床应用和设计的一项重要指标。在气液两相错流流动条件下,利用空气-水系统对错流旋转填充床的气相压降进行分段模型化和实验研究。按照错流旋转填料床气体流动的路径将气相压降分为进口压降、填料层压降、集气段旋转动能转化压降和出气段压降。推导出压降与操作工况的关联式,其计算值与实测值吻合较好。实验表明错流旋转填料床的气相总压降与气体流量、旋转床转速、液体流量有关。在高转速和小气量的条件下,气相压降随气量增大先下降后上升;其他情况随气量增大而上升。错流旋转填料床气相压降随转速上升而下降,在小气量情况下转速对气相压降有明显影响。气相压降随进液量的增大而增大,当旋转填料床在低转速时进液量对气相压降有明显影响。     

撞击流-旋转填料床反应器

理论分析和实验研究表明,撞击流-旋转填料床(IS-RPB)反应器的微观混合比传统反应器更加强烈,制备纳米硫酸钡的研究佐证了IS-RPB反应器强化了微观混合特性.除此以外,IS-RPB反应器在结构方面还具有多项胜过传统反应器的优点,是一种极具有应用潜力的新型反应设备.     

错流旋转填料床气相压降特性研究

旋转床的气相压降是旋转床工程设计的一项重要指标。笔者利用空气,水系统对错流旋转填料床的气相压降进行实验研究。结果表明：在实验范围内,错流旋转床压降是逆流旋转床的十分之一;对错流旋转床压降影响较大的是转速和气量,与液流量几乎无关。     

错流旋转填料床气相压降的研究

利用空气-水系统对错流旋转填料床的气相压降进行了实验研究。采用因次分析的方法推导出错流旋转填料床气相压降的无因次关联式。结果表明,错流旋转填料床欧拉准数在旋转填料床转速与气速之比(旋流比)小于30时,欧拉准数随旋流比的增大反而减小;当旋流比大于30时,欧拉准数随旋流比的增大而增大。旋流比小于30时欧拉准数与填料层轴向厚度的0.9次方成正比,旋流比大于30时欧拉准数与填料层轴向厚度的0.5次方成正比。湿床旋流比小于30时,欧拉准数随进液量的增大而上升;旋流比大于30时,欧拉准数随进液量的增大而下降。     

溶剂回收的新型设备--折流式超重力旋转床

折流式超重力旋转床是一种新型、高效的精馏设备，主要介绍了其结构特点和工作原理，与常用填料式旋转床相比，折流式超重力旋转床可以更方便地实现连续精馏操作所必需的中间进料，并可以同一轴安装多个转子以提高单台设备的分离能力，而在转子之间没有动密封，其在有机溶剂回收精馏过程中成功的工业应用，展示出十分广阔的应用前景。     

密封式错流旋转填料床气膜控制传质过程研究

在密封式错流旋转填料床中,利用浓度为0.926 mol/L的NaOH溶液吸收空气中体积分数为0.5%—1%的CO2气体,对气膜控制过程传质性能进行了研究。实验表明:密封式错流旋转填料床CO2的吸收率随气体流量的增大而减小,在低转速下随旋转填料床的转速增大气体吸收率上升较快,高转速时影响变小;转速大于1 000 r/min情况下,CO2的吸收率随液量的增大而上升,转速小于1 000 r/min情况下,CO2的吸收率随液量增大而变小。建立了密封式错流旋转填料床气膜控制过程的气体吸收模型,经验证实验结果与模型计算结果吻合较好。     

不同填料错流旋转填料床气液传质特性研究

为了探索不同填料错流旋转填料床的传质性能,以Na2CO3水溶液吸收空气中硫化氢为实验体系,对装有不锈钢丝网、塑料波纹孔板和θ环填料的错流旋转填料床的气液传质性能进行研究。实验确定的适宜操作条件为:超重力因子7.8,气体流量2 m3/h,液气比20 L/m3,碳酸钠质量浓度12 g/L;在此条件下,3种填料的脱硫率均可达到90%以上。在相同操作条件下,不锈钢丝网填料的脱硫率及气相总体积传质系数大于塑料孔板填料大于θ环填料;错流旋转填料床中,规整填料的气液传质效果优于乱堆填料。文中的研究结果为错流旋转填料床填料的选取及在脱硫方面的应用提供了依据。     

旋转填料床精馏过程流体力学性能研究

在对旋转填料床精馏特性研究的基础上,以塑料多孔板为填料,乙醇-水为体系,在全回流操作条件下,进一步研究了气相动能因子F、超重力因子β和回流量L对旋转填料床流体力学特性的影响,证明了旋转填料床的低耗能特性。     

Carbon dioxide absorption in a cross-flow rotating packed bed

This work investigates the feasibility of applying the cross-flow rotating packed bed (RPB) to the removal of carbon dioxide (CO₂) by absorption from gaseous streams. Monoethanolamine (MEA) aqueous solution was used as the model absorbent. Also, other absorbents such as the NaOH and 2-amino-2-methyl-1-propanol (AMP) aqueous solutions were compared with the MEA aqueous solution. The CO₂ removal efficiency was observed as functions of rotor speed, gas flow rate, liquid flow rate, MEA concentration, and CO₂ concentration. Experimental results indicated that the rotor speed positively affects the CO₂ removal efficiency. Our results further demonstrated that the CO₂ removal efficiency increased with the liquid flow rate and the MEA concentration; however, decreased with the gas flow rate and the CO₂ concentration. Additionally, the CO₂ removal efficiency for the MEA aqueous solution was superior to that for the NaOH and AMP aqueous solutions. Based on the performance comparison with the conventional packed bed and the countercurrent-flow RPB, the cross-flow RPB is an effective absorber for CO₂ absorption process.     

Micromixing efficiency of rotating packed bed with premixed liquid distributor

Rotating packed bed (RPB), in which high gravity is simulated by a centrifugal force, plays an important role in process intensification of fluid mixing and mass transfer. However, uneven initial liquid distribution in RPB leads to poor micromixing efficiency in local areas of the packing. Therefore, a premixed liquid distributor is proposed in this work to improve the liquid distribution in RPB. Micromixing efficiency of RPB with the premixed liquid distributor was studied by adopting the iodide–iodate reaction as working system and show better micromixing efficiency compared to that of RPB with non-premixed liquid distributor. Also, the effects of operating conditions (e.g. rotational speed, acid concentration, volumetric flow rate) and geometries using the premixed liquid distributor on micromixing efficiency (characterized by segregation index X_S) were investigated. The results show that segregation index X_S decreases with the increase of rotational speed, and the decrease of acid concentration and volumetric flow rate.     

撞击流—旋转填料床应用研究

介绍了撞击流—旋转填料床形成的原理,通过该设备在制备纳米硫酸钡中的成功应用,进一步对其微观混合进行了全面的研究,在此基础上进行了对含酚废水的萃取性能研究和制乳性能研究。应用研究表明,撞击流—旋转填料床是一种应用广泛的新型快速混合化工设备。     

旋转填料床治理氮氧化物废气的研究

介绍了氮氧化物的来源及危害,简要评述了湿法治理的特点,通过考察氮氧化物湿法吸收机理,以气液传质理论为依据,提出采用超重力旋转填料床作为新型吸收设备,并对其原理和研究现状简要介绍。     

撞击流—旋转填料床处理含苯酚废水的单级试验研究

以撞击流—旋转填料床(IS—RPB)作为萃取器和反萃取器,以磷酸三了酯(TBP)作为络合萃取剂,以煤油为稀释剂,以氢氧化钠溶液为反萃剂,对含苯酚废水进行了萃取与反萃取的单级试验研究。在研究IS—RPB两个主要操作参数撞击流初速ν_0和转速N,油水比R以及TBP在油相中的体积分数对级分配率D的影响基础上,找到了最适宜的工艺条件,在此条件下得到了高达95％以上的除酚率。     

旋转填料床吹脱脲醛树脂中游离甲醛的气提气体的研究

基于板材行业中使用的脲醛树脂胶大部分存在游离甲醛超标的问题,提出了新型强化传递过程技术-超重力技术。为了考察空气和水蒸汽两种气提气体通过旋转填料床对脲醛树脂中游离甲醛的脱除效率,在相同的实验条件下,以空气和水蒸汽为气提气体分别进行脲醛树脂脱除甲醛的实验。结果显示水蒸汽对甲醛的脱除率最高为60．1％,空气为58％。说明水蒸汽对甲醛的脱除率略高于空气,并且随进气量的增大脱除率呈现先增大后减小的趋势。对此结果作了理论分析,并指出了两种气体作为气提气体各自的特点。     

Preparation of nanostructured goethite by chemical precipitation in a rotating packed bed

Nanostructured goethite was successfully prepared at 25°C by chemical precipitation in the rotating packed bed in which the rotational speed was 1800 rpm, the flow rate of aqueous FeCl₃ with a concentration of 0.3 mol/L was 0.5 L/min, and the flow rate of aqueous NaOH with a concentration of 0.9 mol/L was 0.5 L/min. The prepared nanostructured goethite had an average crystallite size of 20 nm and a needle shape with a mean length of 500 nm. Moreover, the prepared nanostructured goethite exhibited the Type-III isotherm for N₂ adsorption-desorption with a BET specific surface area of 23 m²/g. The rotating packed bed with the chemical precipitation approach yielded a rate of preparation of nanostructured goethite of about 19 kg/day. The adsorption capacity of the prepared nanostructured goethite was examined using the adsorption of dyes in water. Based on the Langmuir model, its maximum adsorption capacity for Reactive Red 2 was 29.1 mg/g, and its maximum adsorption capacity for Orange G was 24.5 mg/g. Accordingly, the prepared nanostructured goethite can be used as a potential adsorbent for removing dyes from water.