新阳选煤厂粗煤泥系统优化改造与实践

介绍了新阳选煤厂根据重介系统各稀介的指标特征,将精煤稀介、中矸稀介、中煤稀介、矸石稀介分别回收,减少粗煤泥分选机的处理量,从而成功解决了因粗煤泥分选机处理量过大导致不能达产的问题。     

专业基质责任生产助力可持续园艺

专业基质原料和专业基质产品的生产管理和科学评估对满足不断增长的专业基质用户、专业基质生产者、非政府环保组织、政府主管机构和其他利益相关者的需求是十分必要的。"泥炭问题"已经引起欧洲和世界其他地区的广泛关注,但对泥炭的争论各执一词,莫衷一是。最近,欧洲泥炭与专业基质产业协会(EPAGMA)编制发布了基于泥炭和其他基质原料的定量生命循环评估报告,清晰地证明珍珠岩、蛭石、树皮、堆肥、泥炭等所有基质原料和所有基质产品均对环境有或大或小的影响,只有对所选基质原料进行全面分析科学评估,才能实现对专业基质和园艺产业的可持续发展。     

多孔介质/纯流体耦合区域内可压缩气体的流动

采用统一形式的修正N-S方程描述多孔介质/纯流体耦合区域的流动,提出了方程中用于处理多孔介质内流动的源项确定方法,并利用成熟的CFD技术对圆管内具有前后台阶的耦合区域内可压缩气体的流动进行了数值模拟,得到了与实验吻合的计算结果.     

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.     

玻纤滤材过滤阻力的预测

过滤阻力和过滤效率是玻纤空气滤材的关键参数。实际应用中,为了优化滤材阻力和效率之间的矛盾,通常会选择多种尺寸的纤维搭配使用。对这种滤材的过滤阻力进行预测,对于高性能滤材的研制具有重要意义,而目前对玻纤滤材过滤阻力的理论计算大部分还局限于单种纤维的理想情况。本文将针对由多种玻纤原料制备的滤材,根据不同玻纤的比表面积,利用Kozeny-Carman方程计算由此制备的滤材过滤阻力。这种方法计算的过滤阻力理论值与实际测量值非常接近,相关系数R2=0.996 9,可为过滤材料的优化设计提供一定的依据。     

水清洗对空气净化材料过滤性能的影响

用于空气净化的材料一般为一次性使用,但有的应用场所需要对其进行反复水清洗多次使用。通过实验手段,研究常规涤纶纤维层滤料,在荷尘、清洗、烘干、荷尘等多次反复中其过滤效率、阻力、容尘量的变化情况。实验结果表明,清洗对滤料的过滤效率、阻力和容尘量没有明显的影响,滤料可以通过水清洗的方式反复使用。     

Toll-Like Receptors: Expression and Roles in Otitis Media

Otitis media is mainly caused by upper respiratory tract infection and eustachian tube dysfunction. If external upper respiratory tract infection is not detected early in the middle ear, or an appropriate immune response does not occur, otitis media can become a chronic state or complications may occur. Therefore, given the important role of Toll-like receptors (TLRs) in the early response to external antigens, we surveyed the role of TLRs in otitis media. To summarize the role of TLR in otitis media, we reviewed articles on the expression of TLRs in acute otitis media (AOM), otitis media with effusion (OME), chronic otitis media (COM) with cholesteatoma, and COM without cholesteatoma. Many studies showed that TLRs 1–10 are expressed in AOM, OME, COM with cholesteatoma, and COM without cholesteatoma. TLR expression in the normal middle ear mucosa is absent or weak, but is increased in inflammatory fluid of AOM, effusion of OME, and granulation tissue and cholesteatoma of COM. In addition, TLRs show increased or decreased expression depending on the presence or absence of bacteria, recurrence of disease, tissue type, and repeated surgery. In conclusion, expression of TLRs is associated with otitis media. Inappropriate TLR expression, or delayed or absent induction, are associated with the occurrence, recurrence, chronicization, and complications of otitis media. Therefore, TLRs are very important in otitis media and closely related to its etiology.     

滤料表面改性及其在水处理中的应用

表面覆盖金属氧化物、金属氢氧化物和正离子有机基团，可以强化滤料表面的吸附作用，大大提高滤料对有毒物质、细菌和病毒的去除效率。作者机理是表面静电作用和微孔的吸附作用。先进的滤料改性技术为微 污染水源的经济利用提供新的途径。     

Experimental study of multispecies gas combustion in a several-section porous media burner

Experiments with combustion of diluted liquefied petroleum gases used as a fuel premixed with air are performed. From the experiment results, one can see that low-heat-value gases are capable of stable burning in a porous media burner. Distributions of species concentrations and flame temperature are measured. Based on these data, the flame is found to be most stable if the equivalence ratio is equal to 0.8. To improve the burner performance, experiments with different characteristics of porous media are performed. Optimal parameters of porous media are confirmed by subsequent numerical simulations. It is demonstrated that the properties of combustion in the porous media burner are superior as compared to those in the free flame burner.     

机织过滤介质的流体透过性研究

引言机织过滤介质,又称机织滤布,是固液分离领域应用最为广泛的一种过滤介质．滤布的透过度和透水速率的高低直接反映这类过滤介质过滤指标的好坏,因此,研究机织过滤介质透过度和透水速率的变化规律及影响因素对实际过滤作业中合理选择机织滤布具有指导意义．1理论分析机织过滤介质内的孔隙可以分为3类：织物内纱线间孔隙、纱线内纤维间孔隙和纤维上的孔隙．研究表明［1],对流体透过过滤介质起作用的孔隙主要是织物内纱线间孔隙和纱线内纤维间孔隙,因此,假设机织过滤介质总的透水速率是流体通过过滤介质内两类孔隙时的透水速率之和,…     

用层次分析法(AHP)对电子文件载体进行评估

电子文件的载体类型较多,功能各异,根据需存储信息类型和容量的不同可以选择不同形式的载体。正因为如此,当前许多对电子文件载体的评价仅仅是从定性的角度进行分析描述,而在本文中,作者运用一种层次化、系统化的方法——AHP层次分析法对电子文件的载体进行了定性和定量的分析,给出了各载体的综合评价体系和得分,为更科学更有针对性地选择电子文件储存载体提供了一种新的思路。     

亚临界气体喷射器的设计计算

计算气体压缩喷射器可达到喷射系数的研究已很成熟,但对亚临界气体喷射器可达到喷射系数,大多采用气体喷射压缩器的方法进行计算。针对亚临界气体喷射器的特性,给出了3种计算方法:气体喷射压缩器计算方法;喷射泵计算方法;气体喷射器计算方法。研究表明:对膨胀比和压缩比都小于临界压力比的亚临界气体喷射器,膨胀比较大时,工作介质的弹性影响不能忽略;压缩比较小时,引射介质的弹性影响应该忽略;进而得出在膨胀比和压缩比都接近临界压力比时,适宜采用把工作介质视为弹性,引射介质视为非弹性的气体喷射器计算方法;而在膨胀比和压缩比都非常小且接近于1时,应该采用把工作介质和引射介质都视为非弹性的喷射泵计算方法。     

液-固流化床中滤料流场及固含率分布

用PV4A测速仪和CFD数值模拟的方法对液-固流化床内滤料(固体颗粒)的流动行为进行了研究,得出了流化床内滤料的流场分布状况.试验结果表明:流化床中铜锌合金(KDF)滤料的运动速度和固含率随流化床高度的增加分别呈现出先上升后下降的趋势;而沿径向从中心至管壁则呈下降趋势.模拟结果显示的固相运动速度和体积分率的轴径向分布趋势与试验测定结果基本吻合.     

Wet-soiling Behaviour of Textiles

The soiling behaviour of nylon 6, nylon 6.6, Terylene, polypropylene, Tricel, Dicel, Courtelle, cotton, cuprammonium rayon and Terylene-cotton and Terylene-Vincel blends in aqueous and ‘dry-cleaning’ media containing fatty and particulate soils is described. In aqueous media hydrophobic fibres generally soil more than hydrophilic fibres; in ‘dry-cleaning’ media the opposite is true. The individual contributions to the soiling of textiles by fatty soil, air-borne particulate soil and the organic components of air-borne soil are assessed. The water-soluble components of air-borne soil are largely responsible for the yellowing of nylon fibres in aqueous media. The soiling-test methods developed are thought to represent realistically the behaviour of textiles that are repeatedly worn and washed.     

采用RE-TM材料的光记录-磁读出方式

以TbFeCo为主的稀土族-过渡金属（RE-TM）合金,能够很容易地获得很大的垂直磁各向异性,适于高密度磁记录。对采用该材料的介质,应用与HDD（硬盘驱动器）同样的磁读出方式进行读出。记录方式采用基于光照射的高温消磁型热磁记录方式。该记录方式应用于磁光盘（MO）的写入。根据磁记录膜的磁特性,靠单一的磁性膜不易同时采用这些记录方式和读出方式。通过磁性膜多层化的方法解决了这个难点。磁读出方式与磁光读出方式相比,读出分辨率有很大提高,具有实现远超磁光盘记录密度的前景。     

浅谈湿法球磨瓷质砖坯料的研磨介质选材

本文根据生产实践论述了湿法球磨瓷质砖坯料的研磨介质选材的原则和方向 ,并通过大生产应用比较 ,认为中等密度的高铝瓷球是较为合适的选材对象。     

制冷系统中冷媒的选用

介绍了常用的冷媒及其使用条件,比较了冷媒的性能指标,并进行了经济性分析。     

电力行业用新型高防酸处理玻纤布覆膜滤料的性能研究

针对电力行业酸性烟气工况的特点,开发了新型高防酸处理玻纤布覆膜滤料。对比研究了新型高防酸处理与常规处理玻纤布覆膜滤料的防酸性能、防水性能,结果显示新型高防酸处理玻纤布覆膜滤料相比普通玻纤布覆膜滤料具有明显的防水、防酸优势。     

Effect of particle loading on the collection performance of an electret cabin air filter for submicron aerosols

Electret filters are composed of permanently charged electret fibers and are widely used in applications requiring high collection efficiency and low-pressure drop. We tested electret filter media used in manufacturing cabin air filters by applying two different charging states to the test particles. These charging states were achieved by spray electrification through the atomization process and by bipolar ionization with an aerosol neutralizer, respectively. Polydisperse solid NaCl particles with 0.1%, and 1% solutions or liquid dicotyl sebacate (DOS) particles were generated from an atomizer, and they were loaded on the filter media. The amount of charge, the mean particle size, and the particle material significantly affected the collection performance of the electret filter media for submicron particles. The collection efficiency of the electret filter media degraded as more particles were loaded, and showed minimum efficiency at steady state. The electret filter media captured the highly charged particles more efficiently during the transient state. At steady state, the filter media loaded with smaller NaCl particles showed lower collection efficiency. The filter media loaded with liquid DOS particles showed collection efficiency much lower than those loaded with solid NaCl particles.     

多孔介质内流体流动的格子Boltzmann模拟

采用格子Boltzmann方法模拟多孔介质内的流动过程,通过预测渗透率,比较了单松弛模型、多松弛模型和熵格子模型在多孔介质计算中的优劣,为研究多松弛模型中各自由参数的影响,选择了12种组合进行模拟,此外,还将大涡模拟与格子Boltzmann方法相结合模拟了多孔介质内高Reynolds数下的流动及流型的转变。结果表明：单松弛模型和熵格子模型预测的渗透率随黏度逐渐增大,而多松弛模型得到的结果随黏度变化很小,另外,多松弛模型中不同松弛参数的组合对结果有较大的影响,通过比较推荐了模拟多孔介质时的最佳组合,计算结果与经验公式吻合较好。大涡模拟与多松弛模型结合较好地预测了多孔介质内流型的转变,Reynolds数越大,多孔介质内的涡越多,并且变大。