错流填料塔SO2吸收率的测定

研究了 SO2在错流填料塔中的吸收率,结果表明,错流填料塔能更好地消除壁流,改善气液两相的接触状况;错流填料塔的吸收率明显大于普通填料塔,在气液两相流量一定时,吸收率随着板间距与塔径之比(H/D)的变化而变化,当H/D=0.8时,吸收率最大;当H/D＜0.8时,随着气量的增加,吸收率逐渐减小,仅在小气速下,吸收率较大,...     

错流填料吸收塔吸收率的测定

填料塔是一种常用的气液传质设备,通过对传统填料塔内气液二相流动行为的研究,提出了一种带折流挡板的新型填料塔——错流填料塔。实验表明,错流填料塔能更好地消除壁流,改善气液二相的接触状况;错流填料塔的吸收率明显大于普通填料塔,在气液二相流量一定时,吸收率随着H/D(板间距与塔径之比)的减小而逐渐增大,当H/D=0.8时,吸收率最大;当H/D<0.8时,随着气量的增加,吸收率逐渐减小,仅在小气速下,吸收率较大,在气速较大时,由于压降过大,导致吸收操作无法正常进行。     

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。     

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。     

高强度填料塔工业试验报告

南化公司研究院在镇江硫酸厂进行了高强度填料塔的工业试验,规模为40kt/a,塔的操作气速达1.6m/s,填料层高度4.5m,干燥、吸收效率均达到规定指标。文中对镇江硫酸厂的改造情形,条形支承梁的试制、限流孔板布酸管的应用及组合式纤维除雾器的配套使用等情况作了详细介绍。对高强度填料塔的压力降、填料的传质性能及高强度填料塔的经济效益也展开了讨论。     

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。     

旋转填料床最新研究进展

旋转填料床是20世纪80年代发展起来的一种新兴气液传质设备,经过20多年的发展,旋转填料床在设备构型、气液进料上不断得到改进。就旋转填料床的研究进展进行了详细阐述,并介绍了几种常见的旋转填料床。     

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。     

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。     

Experimental study of hydromechanics and mass transfer characteristics in cross flow packed tower

The functions of hydromechanics and volumetric mass transfer coefficient K_Xa of cross flow packed tower were studied by setting baffle plates. The influence of plate spacing on the pressure drop, height of the mass transfer unit, and mass transfer characteristics were investigated in an ordinary packed tower and a cross flow packed tower. The pressure drop increased with a rise in the flow rate of gas and liquid, and an excessive pressure drop caused flooding in the cross flow packed tower. The height of the mass transfer unit increased with a decrease in the gas flow when H/D = 0.8 ? 1.2, while increased with the increase of the gas flow when H/D = 0.6. In the ordinary packed tower and the cross flow packed tower, K_Xa increased with a rise of liquid flow. The influence of gas flow on K_Xa was negligible in the ordinary packed tower, however, in the cross flow packed tower the K_Xa gradually increased with a rise in the gas flow rate. The effect of mass transfer was optimal at H/D = 0.8. In addition, using STATISTICA software, the corresponding K_Xa correlations were proposed and discussed.     

填料吸收塔内乙醇胺溶液吸收CO2增强因子

醇胺溶液吸收CO₂是沼气提纯领域重要的研究课题。在实验填料吸收塔中,以NaOH水溶液吸收低浓度CO₂的实验结果估算了填料的有效相界面积,建立了乙醇胺（MEA）溶液吸收高浓度CO₂增强因子的数学模型,并从数学模型和实验的角度研究了MEA浓度、进气流率、CO₂浓度等工艺参数对MEA吸收CO₂增强因子的影响。结果表明,增强因子数学模型计算值与实验值能够良好吻合,MEA吸收CO₂化学反应增强因子随进气CO₂浓度增加而降低,随MEA浓度增加而增加,随进气流率增加而减小。     

填料塔中活化MDEA吸收CO2的模拟研究

根据近期国内外关于活化MDEA(N 甲基二乙醇胺)溶液吸收二氧化碳的基础研究,以及有关填料塔的研究结果,针对目前脱碳工业设计与改造的需求,对工业脱碳塔的吸收过程进行了深入研究。以化学工程的基本原理为基础建立了数学模型,对活化MDEA脱碳过程中吸收塔的塔高计算提出了新的模拟方法,建立了相应的模拟软件,通过与工业实际的对比,计算获得了较好的效果。     

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.     

生物填料塔技术的研究与进展

生物填料塔技术足填料塔和生物膜技术的结合,在很多领域都有广阔的应用前景.本文简述了生物填料塔的结构和工作原理,重点论述了其在废水和废气处理方面的应用.     

填料塔中哌嗪二胺吸收低浓度SO_2的传质性能

为满足有机胺法脱硫设计开发的需要,采用动态吸收法测定了填料塔中哌嗪二胺(PA-A)水溶液吸收低浓度SO2的体积总传质系数KGa,考察了吸收工艺参数如吸收液中的PA-A浓度和初始pH值、液相流率、吸收温度、进气SO2浓度及流速等对KGa的影响。结果表明:KGa随着吸收液中的PA-A浓度和初始pH值、液相喷淋密度的增加而增大;随着吸收温度、气相流率及进气SO2浓度的增加而减小。通过实验结果分析得到体积总传质系数KGa与气液相流率比(qG/qL)之间符合指数关系式,该经验关系可用于工程设计计算。     

填料塔中磷酸钠缓冲溶液吸收低体积分数SO2的体积传质系数

为满足磷酸一钠和二钠缓冲溶液脱硫设计开发的需要,采用磷酸钠缓冲盐溶液为吸收剂,测定和计算了在鲍尔环填料塔中磷酸钠溶液吸收模拟烟气中SO2的体积总传质系数KYa.在常温常压下,考察了空塔气速、喷淋密度、入口SO2体积分数、吸收液磷酸根浓度和初始pH等工艺参数对KYa的影响.结果表明,KYa随着空塔气速、喷淋密度、初始pH和磷酸根浓度的增加而增大;随着入口SO2体积分数的增加先增加后减小;该体系的传质过程受气膜和液膜共同控制.     

分形理论分析填料塔内件的发展

综述了乱堆填料、规整填料和气液分布装置的发展概况,应用分形理论分析填料的几何结构对气液传质的影响,并提出了今后填料塔研究的方向.     

Performance of CO2 absorption in a diameter-varying spray tower

The application of spray towers for CO₂ capture is a development trend in recent years. However, most of the previous jobs were conducted in a cylindrical tower by using a single spray nozzle, whose configuration and performance is not good enough for industrial application. To solve this problem, the present work proposed a diameter-varying spray tower and a new spray mode of dual-nozzle opposed impinging spray to enhance the heat and mass transfer of CO₂ absorption process. Experiments were performed to investigate the mass transfer performance (in terms of the CO₂ removal rate (η) and the overall mass transfer coefficient (K_Ga_e2 are major factors, which affect the absorption performance and the maximums of η and K_Ga_e that are 94.0% and 0.574 kmol·m^-3·h^-1·kPa^-1, respectively, under the experimental conditions. Furthermore, new correlations to predict the mass transfer coefficient of the proposed spray tower are developed in various CO₂ concentrations with a Pearson Correlation Coefficient over 90%.