某滨海电厂钢结构腐蚀防护

滨海某电厂4台机组锅炉炉架及其附属钢结构在海洋大气环境中腐蚀严重，其主要腐蚀原因是海洋大气中富含盐分，干湿交替导致金属表面盐浓度较高，水膜中富含氧分子，且溶有其它酸性气体，腐蚀性极强，因而钢结构腐蚀较快。为此提出有机涂层配套体系和热喷锌或喷铝两种解决方案，以确保电厂设施正常安全运行。     

喷射共沉积SiCp／6066A1复合材料的组织性能增强颗粒捕获机制

研究了喷射共沉积SiCp/6066Al基复合材料增强颗粒的捕获机制，以及复合材料在加工过程中组织、性能的变化。结果表明：喷射沉积过程中，平均粒度为10μm的SiCp颗粒基本上可以被6066铝合金完全捕获；复合材料平行挤压方向轧制的致密度和强度高于垂直挤压方向轧制的，平行轧向的强度高于垂直轧向的。     

AI-Li/SiCp composites and Ti-AI alloy powders and coatings prepared by a plasma spray atomization (PSA) technique

There has been increasing use of Al-Li alloys in the aerospace industry, due mainly to the low density and high elastic modulus of this material. However, the problem of low ductility and fracture toughness of this material has limited its present application to only weight- and stiffness-critical components. Development of Al-Li/ceramic composites is currently being investigated to enhance the service capabilities of this material. The Ti-Al alloy is also of interest to aerospace-type applications, engine components in particular, due to its attractive high-temperature properties. Preparation of fine powders by plasma melting of composite feedstock and coatings formed by plasma spraying was carried out to examine the effect of spray parameters on the microstructure and properties of these materials. Characterization of the powders and coatings was performed using the scanning electron microscope and image analyzer. Examination of the plasma-sprayed powders and coatings has shown that in the Al-Li/SiC composite there is melting of both materials to form a single composite particle. The SiC reinforcement was in the submicron range and contributed to additional strengthening of the composite body, which was formed by a cold isostatic press and consolidated by hot extrusion or hot forging processes. The plasma-sprayed Ti-Al powder showed four categories of microstructures: featureless, dendritic, cellular, and martensite-like.     

等离子喷涂参数对Ta／W／Sn复合涂层组织性能的影响

采用等离子喷涂方法在LY12铝上制备了Ta/W/Sn复合涂层。研究了各种工艺参数对涂层材料熔化程度和沉积效率的影响。采用扫描电子显微镜观察了复合涂层的表面及界面，精密机械天平称量涂层的增重，力学拉伸机测量涂层的抗拉结合强度，能谱和化学方法分析涂层的化学成分。结果表明，等离子喷涂工艺可以制作组织致密，厚度均匀的Ta/W/Sn复合涂层；喷涂功率和送粉速率对材料的熔化状态影响较大，在特定喷距范围内喷距的影响则较小。     

烟气脱硫喷淋塔的数值模拟

以计算流体力学为基础,在三维坐标系下采用标准k-ε双方程模型求解动量、能量和组分方程,结合浆滴蒸发模型及简化的浆滴脱硫反应模型,以Eu ler-Lagrange方法建立了喷淋塔内烟气脱硫的数值计算模型,模型计算结果与孔华的试验数据符合较好。模型计算结果表明,对于粒径小的喷淋液滴,其烟气脱硫反应和液滴蒸发主要发生在烟气进口附近,而随着液滴粒径的增大,液滴在塔内蒸发和脱硫反应的过程延长。同时,增加烟气温度、降低烟气中SO2的入口质量浓度以及增加液气比均有利于提高脱硫效率。文中模型相对于一维柱塞流模型,能够直观地显示出喷淋塔内的流场、温度场和组分质量浓度场的空间分布。     

Process conditions affect pigment quality and yield in extracts of purple sunflower hulls

Extract of purple sunflower hulls is a potential red food colorant; however, suitable process conditions must still be identified. Selected process variables were studied using bench-scale units to prepare, clarify, concentrate and spray dry extracts. Concentration by evaporation at 32°C and addition of maltodextrin to 15% (wt/dry wt) prior to drying largely eliminated pigment degradation during those steps. Relative to water extracts, extracts prepared with 5 to 15% ethanol in water generally yielded more pigment with similar levels of degradation and loss during subsequent processing. Use of 5% ethanol/2% citric acid reduced yield by about half relative to water, but gave a powder with a lower degradation index and wetting time. Percentage recovery of pigment during concentration and drying was not greatly affected by solvent type or extraction temperature.     

静电粉末喷涂用聚三氟氯乙烯

综述了静电粉末喷涂用聚三氟氧乙烯的性能、合成方法及市场价值。从引发剂、乳化剂、pH缓冲剂等方面，详尽讨论了静电粉末喷涂用聚三氟氯乙烯的研究进展，总结了国内聚三氟氯乙烯存在的问题并提出了解决办法。     

轻型客车厂油漆车间的设计

本文阐述了某公司轻型客车厂涂装车间在利用原有厂房的改造中,对各工作区合理地采用分层、分区域的布置,其主要操作面在4.0 m的加层上。该涂装生产线通过采用柔性化理念,能同时满足2种不同轻型客车车身的共线生产需要。     

An Investigation of Error Sources in Computational Fluid Dynamics Modelling of a Co-current Spray Dryer

The paper is focused on identifying error sources in computational fluid dynamics(CFD) predictions of a spray drying process. Seven groups of drying and atomisation parameters were selected for analysis and 13 simulation trials were performed. The theoretical results were compared with experimental data and sensitivity of the simulation results to the analysed factors was determined. The following parameters affecting the accuracy of CFD spray modelling were found: gas turbulence model, particle dispersion, atomising air, initial parameters of atomisation and heat losses to the environment. A major difference in the errors committed during modelling of spray drying process for fine and coarse sprays was observed.     

喷雾干燥塔结构对产品收率的影响

依据流体力学原理中颗粒沉降原理，对超细碳酸钙生产装置中压力式喷雾干燥塔的工艺参数进行了计算，并提出在干燥塔底增加一个文丘里装置的改造方案，降低了产品的落塔量，提高了干燥产品的收率；同时增加喷雾管道夹套冷却装置，避免了投料喷嘴容易堵塞、影响生产的现象，提高了干燥塔的生产能力。