5H-20新型谷物烘干机的研制与开发

介绍了采用多级顺流干燥工艺开发研制的5H-20新型谷物干燥机，经生产和实际使用证明，该机具有降水幅度大，耗能低，对粮食无污染，可以烘干多种谷物等特点。     

GSX600型闪蒸干燥机在干燥高粘度膨润土中的应用

根据GSX600型闪蒸干燥机干燥膨润土的运行情况,介绍了GSX600型闪蒸干燥机的操作方法及操作时应注意的一些问题,根据膨润土高粘度的特性和设备的具体情况对系统做了一些调整和改进,对干燥产品的粒度和水分进行了测试。     

Characterization of FeS2-pyrite thin films synthesized by sulphuration of amorphous iron oxide films pre-deposited by spray pyrolysis

FeS₂-thin films with good crystallinity were synthesized by a simple method which consists of sulphuration, under vacuum, of amorphous iron oxide thin films pre-deposited by spray pyrolysis of FeCl₃·6H₂O (0.03 M)-based aqueous solution onto glass substrates heated at 350 °C. At optimum sulphuration temperature (450 °C) and duration (6 h), black green layers having granular structure and high absorption coefficient (5.10⁴ cm⁻¹) were obtained. The study of the electrical properties of the as-prepared films vs. the temperature variations showed three temperature domain dependence of the conductivity behaviour. The first one corresponds to the high temperature range (330 K–550 K) for which an Arrhenius plot type was obtained. The activation energy value was estimated at about 61.47 meV. The second domain corresponding to the intermediate temperature range (80 K–330 K) showed a variable activation energy between the grain boundaries. The barrier height, q¯, was estimated to 27±0.5 meV, and the standard deviation, qσ, was evaluated at about 14±0.5 meV. We found that at lower temperatures (20 K–80 K), the conductivity is governed by two conduction types. The density of localised states, was about 2.45×10²⁰ eV⁻¹ cm⁻³.     

Thermal and structural properties of spray pyrolysed CdS thin film

Using photo acoustic technique, the thermal properties of CdS thin films grown by spray pyrolysis are measured. Thermal diffusivity and conductivity in these films decrease at least two orders compared with bulk. These results are compared with our study on nano CdS and the other available literature. The comparison is good. The dependence of thermal diffusivity on the thickness of the layer or the size of the particles on the glass substrate are analysed from the present measurement and discussed. The dependence of thermal diffusivity on the thickness of the layer on the glass substrate is discussed.     

蒸发式冷凝器结构特点及工程应用

本文对蒸发式冷凝器的结构、工作原理及安装、使用过程中应注意的问题作一下介绍.并结合工程实例,对蒸发式冷凝器和水冷式冷凝器作综合比较.     

面向直纹组合曲面的喷涂机器人喷枪轨迹优化与算法

针对复杂自由曲面中直纹组合曲面上喷涂机器人喷枪轨迹优化及轨迹连接问题,基于曲面面片造型与智能算法理论,建立了喷枪轨迹优化数学模型,提出一种满足直纹曲面上喷枪轨迹首尾衔接的算法程序。首先,通过曲面特征定义直纹曲面,并对直纹曲面造型处理后建立复合喷涂直纹圆弧面片的喷枪数学模型;其次,选择直纹组合面片交界处的喷枪轨迹为优化对象,依据该模型对直纹曲面及直纹组合面片上的喷枪轨迹进行优化,验证了该模型的有效性;最后,依据轨迹优化模型,设计算法程序并通过仿真实验,验证了该算法程序的可行性与优越性,实现了对直纹组合曲面的连续性喷涂。     

Microstructure and Tensile Properties of Spray Deposited Al-2.15Li-1.28Mg-1.26Cu-0.10Zr Alloy

0INTRODUCTIONSinceDuwezproducedfirstlyglassyAu-Sialloybyrapidquenchingtechniqueinl96o['],rapidsolidificationtechnologyhasmadegreatprogress.Nowadaysanumberofrapidsolidificationmethodshavebeenusedtopro-ducerapidlysolidifiedmaterialssuchaspow-der,ribbon,foilandwirel'].ThesetechniquesareabletoachievecoolingratetotheorderoflO'~lO't/s,yieldingexcellentlyrefinedandhomogeneousmicrostrllcturewithre-sultantoutstandingmechanifPl,physicalandchemicalpropertiesl"'].Althoughprominentimprovementsinprop…     

铜闪速熔炼三年长周期生产实践

为了持续提高技经指标,提高生产效率,降低生产成本,江西铜业股份有限公司贵溪冶炼厂开创了三年长周期生产实践。针对贵冶熔炼二系统闪速炉在三年长周期生产实践中干燥机系统、排烟系统和闪速炉系统出现的生产瓶颈问题,查找原因并提出解决办法。生产实践表明,随着入炉高杂质原料占比越来越高,生产仍能均衡稳定,主要技术经济指标持续进步。     

蒸汽管回转干燥机在硫精砂干燥中的应用

主要介绍蒸汽管回转干燥机的结构及 1 200 t/d 硫精砂干燥机的设计.与传统采用热风作为干燥介质的回转窑式干燥机相比,蒸汽管回转干燥机采用硫酸废热发电系统抽出的低压蒸汽作为干燥介质,热源稳定,节省用煤,并且不产生新的硫污染.试验表明,当物料ω(H2O)低于 15% 时,处理量和干燥强度基本在设计范围内,载气温度 110～123℃,相当安全.     

Predictive CFD modeling of whey protein denaturation in skim milk spray drying powder production

A new model of whey protein thermal inactivation has been combined with a CFD model developed for skim milk spray drying. Extensive evaporation and particle formation models were used to calculate particle moisture contents, temperatures and residence times. Calculated parameters were then used as input data for an experimentally developed quality model based on Williams-Landel-Ferry (WLF) equations for inactivation kinetics. The developed quality model was implemented into the CFD code and calculated in parallel to simulations of skim milk droplets evaporation based on the characteristic drying curve approach. The quality model and the simulation procedure were validated by comparison of protein activity levels obtained from the CFD with data obtained from differential scanning calorimetry (DSC) of milk powder samples collected during skim milk spray drying experiments. The simulations for different feed rates fit well with measurement results and show that the loss of whey protein activity is lower at higher feed rates, due to lower temperature fields in this case.