6 000 t/d水泥生产线窑尾钢结构框架安装 防护措施介绍

水泥熟料生产线窑尾钢结构框架是水泥厂建设项目中标志性建筑物,施工周期长、作业高度高、交叉作业多、施工危险性大,容易发生安全事故。本文以某6000t/d新型干法生产线窑尾钢结构框架为例,探讨了窑尾钢结构框架安装防护的安全措施。通过实际施工过程中的检验,安全生产绩效显著。     

海水淡化远程数据采集及监测系统的设计与应用

为满足海水淡化工程信息化管理需求,该文设计了一套远程数据采集及监测系统。系统包括数据采集端和远程监测端,数据采集端具有多通道采集、存储、显示及网络传输功能,远程监测端具有显示分析功能。将该系统应用于某海岛100 t/d海水淡化工程,运行结果表明:系统误差率小、实时性高、可靠性好,能够精确采集和传输现场数据,实时监测工程状况。     

Graphene Aerogels with Anchored Sub‐Micrometer Mulberry‐Like ZnO Particles for High‐Rate and Long‐Cycle Anode Materials in Lithium Ion Batteries

Graphene aerogels (GAs) anchoring hierarchical, mulberry‐like ZnO particles are fabricated in situ using a one‐step solvothermal reaction. The resulting composites can function as anodes in lithium ion batteries, where they exhibit a high capacity and cyclic stability. The reversible capacities obtained are 365, 320, and 230 mA h g^?1 at current densities of 1, 2, and 10 A g^?1. Their high reversible capacity is 445 mA h g^?1 at a current density of 1.6 A g^?1; this value is maintained even after the 500th cycle, The excellent electrochemical performance is attributed to strong oxygen bridges between ZnO and graphene, where C–O–Zn linkages provide a good pathway for electron transport during charge/discharge cycles. Additionally, the hierarchical structure of the ZnO microballs suppresses stacking among the graphene layers, allowing the GAs to accelerate the transport of lithium ions. Furthermore, the GA framework enhances the electrical conductivity and buffer any volume expansion.     

Research progress of graphene oxide membrane for water purification

Graphene oxide membranes have ultra-high water flux, controllable interlayer spacing and excellent separation properties. These outstanding characteristics make graphene oxide membranes promising to be a new generation of membrane materials and used for the precise separation of substances in the water environment. At present, researchers have performed numerous studies on graphene oxide membranes and achieved breakthrough results, including the transfer behavior of water in the membrane, the separation mechanism of the membrane and the preparation methods of the membrane, etc. However, there is still a lack of comprehensive understanding of graphene oxide membranes. This review systematically described the structural properties and structure-effect relationships of graphene oxide membrane, and summarized the typical preparation methods. In terms of the challenges faced by graphene oxide membrane in practical application, we focused on the existing modification methods of graphene oxide membrane. The applications of graphene oxide membrane in various water environments were also discussed. Finally, the future development of graphene oxide membrane was summarized and prospected. The aim of this paper is to provide novel ideas for the design and synthesis of high-performance graphene oxide membranes for water purification.     

Progress in the sulfur resistance of reforming catalysts

Hydrocarbon in-situ reforming hydrogen supply technology based on solid oxide fuel cell (SOFC) is an important distributed and miniaturized hydrogen production solution. Traditional nickel-based reforming catalysts often face sulfur poisoning during the reaction with trace amount of sulfur in the feedstock. In some cases, the existing sulfur may even cause severe safety risks. In this paper, the mechanisms of sulfur poisoning are summarized; the compositions and contents of sulfur species in natural gas, liquefied petroleum gas and liquid hydrocarbon are briefly described; the reported sulfur resistant catalysts for different reforming reactions are reviewed, and the effective and feasible solutions for developing sulfur-tolerant catalysts are summarized. The mechanisms of sulfur poisoning could guide the design of sulfur-resistant reforming catalyst with high performance. Finally, the paper reveals that the improvement of catalytic overall performance, the pretreatment of reforming feedstock and the design of reforming reactor and other comprehensive anti-sulfur strategies are also important research directions.     

Morphology prediction of lithium plating by finite element modeling and simulations based on non-linear kinetics

Lithium metal has a very high theoretical energy density and is one of the most promising anode materials for a new generation of lithium batteries. It is easy to form dendrites during the deposition of lithium metal, which greatly affects the safety and service life of lithium metal batteries. Mechanism of dendrite propagation in lithium metal batteries (LMB) is still to be fundamentally described. Herein, we studied the effects of electrochemical parameters on the behavior of lithium plating at the electrode/electrolyte interface using a tertiary current model by finite-element methods. The results show that dendrite growth is intrinsically influenced by differences in concentration and potential. A higher diffusion coefficient (D_e) of Li ion in electrolyte is effective to improve uniformity of local concentration and a smaller exchange current density (i⁰) is essential for reducing sensitivity of interface reaction. Activation polarization is beneficial for uniform plating of lithium. Thus, the polarization curve is extremely important to determine whether lithium deposits uniformly or not. This work results in a new understanding of principles for dendrite growth, and is expected to lead to new insights on strategies for dendrite suppression.     

中温SOFC阳极阻挡层La0.45Ce0.55O2-δ薄膜的制备

La0.45Ce0.55O2-δ（简称LDC45）作为Ni—LDC45阳极和LSGM电解质之间的阻挡层可以阻止二者之间的固相界面反应。采用丝网印刷方法制备了LDC45阻挡层薄膜，并从粘结剂的选择、膜层的丝网印刷和烧结工艺的优化3个方面对LDC45阻挡层的制备工艺进行了详细研究。通过对粘结剂的筛选，发现采用乙基纤维素能获得较为致密的阻挡层：通过丝网印刷工艺的研究，发现刮板和53μm丝网分别是较为理想的印刷工具和丝网规格；通过对烧结工艺的优化，发现1400℃是烧结阻挡层的最佳温度。引入LDC45阻挡层可以有效阻止阳极与电解质之间的界面反应，并对燃料的化学吸附的分离有催化作用，将电池的最大输出功率密度提高了72％。     

BaO-CaO-Al2O3-SiO2系玻璃陶瓷在SOFC中的应用

研究了BaO-CaO-Al2O3-SiO2体系玻璃陶瓷封接材料在固体氧化物燃料电池中的应用.该体系封接材料与铁酸镧(LSF)阴极材料和Fe-Cr合金连接体之间具有良好的热膨胀性能匹配性,良好的粘接性,并且封接材料与两种电池材料之间有良好的稳定性和相容性,BaO-CaO-Al2O3-SiO2体系玻璃陶瓷可以作为固体氧化物燃料电池的封接材料.     

空气等离子喷涂板式SOFC连接体保护涂层的性能

在中温平板型固体氧化物燃料电池（ITSOFC）设计中,可以采用金属作为连接材料.Fe-16Cr合金是较为理想的金属连接材料,它存在的主要问题是连接体阴极侧表面的高温氧化和腐蚀,会导致电池性能的迅速降低.本研究采用空气等离子喷涂的方法喷涂了La0.8Sr0.2MnO3-σ（LSM）钙钛矿型保护涂层在金属连接板的表面,并讨论了主要过程参数及其作用效果.研究发现,喷涂后热处理是降低涂层孔隙率的有效方法,经喷涂-热处理后,涂层的孔隙率可降至1%以下.等离子喷涂LSM保护涂层后,Fe-16Cr合金的耐高温氧化性能明显提高,氧化速率降低了76%.     

基于Agent的个性化分类邮件系统研究

该文提出了一个基于agent的个性化邮件分类系统的框架及各个组成部分的功能描述。在该系统中,对邮件分类管理建立在用户模型和邮件内容模型的基础上,其中用户模型描述了一段时间内相对稳定的用户分类需求。该文还分析了实现该系统的关键技术,如用户模型和邮件内容模型的建立,个性化分类和排序等,最后提出个性化检索过程和进一步的研究工作。