造纸机用钢制烘缸设计

介绍钢制焊接烘缸的结构形式及采用解析法计算筒体与球形封头连接处最高应力的方法,用有限元法对一实例进行应力校核及缸体变形量计算,并针对设计中的一些细节问题为设计者提供参考建议。     

Development of an air recirculating tray dryer for high moisture biological materials

Fruits and vegetables are highly perishable and deterioration in quality and quantity occurs due to poor storage and processing facilities at the production site in developing countries like India. Dehydration of vegetables using a recirculatory dryer is possible but limited, in practice. The recirculatory dryers so far developed have a drawback of non-uniform drying along the length of the trays. Hence an effort was made to solve this problem. A recirculatory cabinet dryer of capacity 5 kg/batch using a central air distribution system was designed and developed. The dryer was tested with blanched potato chips. At a constant air flow rate of 1.5 m³/min and 65°C temperature, it took about 3 h time to reduce the moisture content from 856.94% (dry basis) to 9.98% (dry basis). The heat utilization factor (HUF) and thermal heat efficiency (THE) of the developed dryer were found to be 18.94% and 22.16%, respectively.     

SDD1型机车空气系统故障分析及改进措施

分析了SDD1型机车空气系统干燥性能不能满足实际使用要求的原因,介绍了改进措施。     

Photoelectrochemical properties of spray deposited n-ZnIn2Se4 thin films

Zinc indium selenide (ZnIn₂Se₄) thin films have been prepared by spraying a mixture of an equimolar aqueous solution of zinc sulphate (ZnSO₄), indium trichloride (InCl₃), and selenourea (CH₄N₂Se), onto preheated fluorine-doped tin oxide (FTO)-coated glass substrates at optimized conditions of substrate temperature and a solution concentration. The photoelectrochemical (PEC) cell configuration of n-ZnIn₂Se₄/1 M (NaOH+Na₂S+S)/C has been used for studying the current voltage (I–V), spectral response, and capacitance voltage (C–V) characteristics of the films. The PEC study shows that the ZnIn₂Se₄ thin films exhibited n-type conductivity. The junction quality factor in dark (n_d) and light (n_l), series and shunt resistance (R_s and R_sh), fill factor (FF) and efficiency (η) for the cell have been estimated. The measured (FF) and η of the cell are, respectively, found to be 0.435% and 1.47%.     

WPB喷粉脱硫装置的应用与改进

武汉钢铁(集团)公司炼钢生产所用WPB喷粉脱硫装置系从国外引进设备,与RH真空脱气设备配套使用,可对钢包内的钢水进行深脱硫处理.在领会原设计思想、正确应用此装置的同时,改进其不足之处,才使其真正发挥出较好使用功能.     

肉桂醛微胶囊的制备工艺

研究了以阿拉伯树胶和麦芽糊精为壁材,喷雾干燥制备微胶囊化肉桂醛的工艺条件,探讨了壁材组成、乳化剂用量、固形物浓度,芯壁化,进风温度、进料速度、喷射压力等对微胶囊化效果的影响,经过正交试验,确定了最佳工艺条件。     

燃油烘包器燃烧控制系统的设计

介绍了燃油钢包烘烤器的燃烧系统和自动控制系统的设计及其特点,讨论了使用时应该注意的问题,对烘包器燃烧控制系统选择提出了建议。     

Physical and Swelling Properties of Spray‐Dried Powders made from Starch and Poly(vinyl alcohol)

The aim of this study was to investigate whether starch and poly(vinyl alcohol) could be compatible in a powder for coating. Free films of a mixture of the polymers were produced by casting and investigated with respect to their mechanical properties and moisture uptake. The moisture uptake was substantially higher when glycerol was added and the glycerol‐containing films had a lower failure stress under tension than the corresponding glycerol‐free films. At glycerol levels of 20 wt% or above, the glycerol content resulted in a high strain to failure. Dry powders with and without glycerol were made from the starch/poly(vinyl alcohol) solutions by spray drying. The powders were investigated by differential scanning calorimetry (DSC), to determine the degree of physical ageing or crystallinity. All powders showed a broad peak indicative of the melting of crystals at 100–150°C in the first scan, but this peak disappeared almost completely after rapid cooling. The glycerol‐free powder showed a small endothermic peak at about 45°C, indicating physical ageing of the powders during storage. Suspensions of the powders in a liquid plasticiser (glycerol or poly(ethylene glycol)) showed a sharp increase in storage modulus at a certain temperature, indicating the onset of swelling. The observed swelling meant that some of the powders are good candidates for plastisol coatings.     

喷射成形制备钢/Al-Pb合金轴瓦材料的研究

利用自行研制的大型喷射成形装置,对成分为Al-6.5Pb-4Si-1Cu-0.5Sn的合金轴瓦材料进行了喷射成形工艺研究。并制备了晶粒均匀密度良好的板坯。研究了合金的显微组织与性能。研究表明：喷射成形Al-Pb合金的显微组织为均匀细小的Pb相粒子弥散分布在Al基体中。这些细小的Pb相粒子对提高合金耐磨性具有很大帮助。喷射沉积成形钢/铝复合板经50％轧制变形后可获得良好的结合强度及组织性能,可做汽车的轴瓦材料。     

锌花大小控制工艺

本文介绍了锌花的外观、形成及影响因素;结合国内外连续热镀锌线介绍了目前常见的三种小锌花工艺,并分析各种工艺的特点和产品应用。