轴向动态反冲洗过滤器过滤含聚污水试验研究

研制一种新型的轴向动态反冲洗过滤器,并开展了过滤含聚污水现场试验,考察了油和悬浮物的去除效果、反冲洗强度、反冲洗历时及滤料反洗再生效能。试验结果表明:该技术过滤含聚污水效果良好,油和悬浮物去除率分别为96.0%和78.1%。反冲洗强度8.8 L/(s·m2)、反洗历时15 min时,过滤器内截留油排除率96.23%,核桃壳滤料油去除率为98.93%,反洗前后滤料表面油量变化明显。     

自动反洗表面过滤器在硫酸装置稀硫酸过滤上的应用

硫酸净化工序斜板沉降器出来的污酸用自动反洗表面过滤器进行清污分离,介绍处理工艺流程及主要设备。每年可以回用硫酸1400t（折标酸）,年经济效益约为86．19万元。     

采用超高分子量聚乙烯过滤介质强化过滤过程的研究

采用颗粒烧结法制备的超高分子量聚乙烯过滤介质,对用途广泛、难过滤的一种无机盐醋酸钙物料做了动态强化过滤过程研究。在对3种超高分子量聚乙烯过滤介质表征的基础上,考察了不同操作压力、旋转速度、固含量、操作温度等对过滤过程的影响。研究表明,过滤通量随着过滤介质孔径增大、压力增大、温度升高、固含量降低均有所增加,截留效果较好,滤液浊度都在30.0 NTU以下,实现了有效的过滤分离,可供技术工程化应用研究参考。     

翻板滤池反冲洗存在问题及解决措施

针对翻板滤池反冲洗时存在的废水溢流、反冲洗废水排放不完全、滤层扰动问题,在分析反冲洗过程的基础上,从滤池构造、反冲洗泵配置及运行参数调整等方面提出解决措施,对溢流废水和初滤水的排放以及反冲洗完毕缓冲阶段的水泵运行参数进行了优化。     

Impact of multilayering on the filtration performance of clean air filter media

Fibrous filter media are commonly used to remove airborne particles that are harmful to human health and the environment. Although filter media are often multilayered for various reasons, no systematic study of the impact of multilayering on filter media performance has been reported. In this paper, direct numerical simulations with the lattice Boltzmann method are used in order to shed light on the impact of multilayering on the performance of clean bimodal fibrous filter media in a Stokes flow regime. Virtual model clean filter media with up to eight layers and various fibre formulations are compared in terms of permeability or pressure drop, capture efficiency, and quality factor. A careful analysis of the results revealed that multilayering had no statistically significant impact on the performance of the clean filter media. At best, the impact of multilayering was similar to that of the inherent variability of such random structures. Fibre formulation was found to be a more efficient way of improving the performance of the filter media. Placing interlayered air gaps between fibrous layers also slightly improved the quality factor by facilitating the flow at the interfaces of the fibrous layers. These findings will guide future studies on the performance of multilayered filters with more complex flow conditions, such as those encountered with inertial or nanofibre-made filter media and with the fouling of filter media.     

双柱式及自动反冲洗换网器在熔体过滤中的应用

介绍了双柱式液压换网器的型号、工作原理、在熔体过滤行业应用的性能特点,以及在现场操作中的技术要点。根据行业发展的方向,简要介绍了新型滤筒反冲洗柱式换网器的性能优势,该型号可以更好地满足制造业更加高效、更加清洁、更加智能化的需求,应该是更优异的熔体过滤解决方案。     

湿法浓磷酸自动反洗表面过滤净化技术研究及应用

介绍湿法浓磷酸自动反洗表面过滤净化装置的工作原理及具体的操作工艺,确定浓磷酸自动反洗表面过滤净化的最佳工艺条件为:过滤压力小于0.02 MPa,反冲周期12 min,反冲时间10 s,清洗周期18 h,稀硫酸溶液清洗时间1.5 h,清洗液w(H_2SO_4)12%,清洗液温度80℃,氢氧化钠溶液清洗时间1.5 h,清洗液w(NaOH)15%,清洗液温度70℃,同时清洗过程辅以蒸汽加热及压缩空气曝气。该工艺条件下,浓磷酸w(固)由4.5%降至0.8%以下,减少浓磷酸储罐投用量近1/4,缩短浓磷酸陈化周期近30%,减少带入磷复肥生产系统中的杂质沉淀量约为30 000 t/a,有效提高浓磷酸品质,稳定磷复肥产品质量。     

A case study of simulating submicron aerosol filtration via lightweight spun-bonded filter media

The most common method of filtration is via fibrous nonwoven media. Fibrous filters are generally characterized by their collection efficiency and pressure drop. Traditional computational studies in this area are typically based on unrealistic 2-D geometries with the fibers simply placed in a lattice (regular array) perpendicular to the flow. The traditional approaches however, do not permit studying the relation between the 3-D structure of a filter media and its performance. In this study, for the first time, a virtual 3-D web is generated based on the fiber orientation information obtained from analyzing microscopic images of lightweight spun-bonded filter media. Pressure drop and collection efficiency of our virtual filter are simulated and compared with the previous 2-D analytical and numerical models as well as experiment. Our pressure drop calculation, unlike the previous models, showed a perfect agreement with the predictions of the Davies’ empirical equation. The collection efficiencies obtained from simulating a thin spun-bonded filter media challenged with submicron particles having diameters ranging from 50 to 500 nm showed a similar trend as that of the previous 2-D models. For the solid volume fraction (SVF), filter thickness, and the fiber and particle diameters considered in this study, we found collection efficiencies higher than that of the above mentioned 2-D models with a relatively good agreement with experimental data obtained from a TSI 8130 filter tester.     

陶瓷滤料对油田采出水精细过滤的影响研究

研究了陶瓷滤料种类、滤料粒径和滤池运行方式对油田采出水精细过滤除油、除浊效果的影响.对陶瓷滤料进行了改性,并用SEM、FTIR对其进行了表征;除油、除浊试验在自制小试装置中进行,并采用红外分光仪、浊度仪测定,结果表明,改性滤料对油、浊度的平均去除率分别提高28.32%、22.3%;0.8 mm.改性滤料除浊能力略优于1.2 mm滤料,而1.2 mm改性滤料除油率高于0.8 mm改性滤料,出水中油浓度前者要比后者约减少2 mg/L;上向流滤柱除油、除浊效果均高于下向流.在此基础上,设计了符合"反粒度"理论的三级精细过滤装置,对江汉油田经混凝、粗粒化预处理的开采水进行了连续三个月运行.出水中油、浊度达到SY/T 5329-1994碎屑岩油藏注水水质中A1类标准(油<5 mg/L、悬浮物<1 mr/L).