基于Fluent二次开发的散装水泥运输车卸料过程数值模拟

针对国内散装水泥车罐体设计中不能充分利用流体软件Fluent的情况,利用VB 6.0编程语言编程开发人机交互界面,对Fluent软件进行二次开发,实现散装水泥车罐体卸料过程的数值模拟的专用功能;通过一个实例模拟散装水泥罐车在卸料过程中布风板对卸料过程的影响。结果表明,把Gambit和Fluent内部封装,界面直观、操作简单,能够很好地模拟水泥罐车流态化与卸料过程,并应用到水泥车罐体的开发中;增大布风板的直径能够有效地减少卸料时间,提高卸料效率,并且提高卸料过程的平稳性,在条件允许的情况下应增大布风板的直径。     

散装水泥运输罐车流化床改进方案的研究及仿真

以某型号散装水泥运输罐车为研究对象,提出几种改善流化质量的研究方案;在流体力学计算软件FLUENT中建立流化床流态化模型,对改进后的流化过程进行仿真,并且对流化质量进行评价分析。结果表明:采用40°侧导流板,用弧形布风板代替平面布风板的改进优化后,能够有效改善散装水泥运输车罐内水泥的流化质量,在原有的散装物料运输车的基础上对其结构进行改进,能够改善其工作性能,提高工作效率。     

热烈祝贺《质量振兴纲要》颁布一周年

包头北方·奔驰重型汽车有限责任公司该公司是我国三大重车生产基地之一,主要生产8～20吨重型载重汽车,包括载重车、自卸车、牵引车、水泥搅拌车、液化气槽车以及散装罐车、粮食车、军车等系列车型。北方奔驰载重汽车是高品位、高性能、高可靠性产品,在国内重车中处于领先地位。公司有雄厚     

我国散装水泥行业标准发布实施

近日,国家国内贸易局发布了《散装水泥立式流动罐》、《粉状物料散装机》等两项行业标准。这标志着我国散装水泥行业标准化工作开始起步。《散装水泥立式流动罐》等两项行业标准是根据我国散装水泥行业技术装备迅速发展,规模化、标准化的需要,结合国内散装水泥的生产经营...     

高举质量振兴旗帜 努力提高产品质量

包头北方·奔驰重型汽车有限责任公司该公司是我国三大重车生产基地之一,主要生产8—20吨重型载重汽车,包括载重车、自卸车、牵引车、水泥搅拌车、液化气槽车以及散装罐车、粮食车、军车等系列车型。北方奔驰载重汽车是高品位、高性能、高可靠性产品,在国内重车中处于领先地位。公司有雄厚的科研、设计开发、工艺技术力量及强大的综合加工能力。多年的生产实践积累了制造重型汽车的丰富经验,并不断消化吸收奔驰的     

散装锅炉的锅筒安装

锅筒安装的正确与否,直接关系到锅炉的使用和安全运行,本文介绍了散装锅筒安装的一些体会。     

浙江省散装水泥总量连续五年位居全国之首

城市建设中弥漫的水泥粉尘让人避之不及，而散装水泥使用时产生的粉尘只有袋装水泥的1／6，故国家贯彻“提倡散装、改革袋装、推动集装”改进水泥包装的方针，据省散装水泥办公室消息报道，     

凝结水泥的爆落方法

随着建筑业的发展,我国水泥生产规模越来越大,速度也越来越快。很多厂已采用转窑自动控制生产新工艺。这是水泥生产的一大革命。但是,水泥生产的连续性和使用水泥的季节性不协调,目前又推广散装水泥新工艺,因此,工厂和用户必须建造大容量的散装水泥转存库。大量的散装水泥堆积在转存库內,容易凝结,致使不能畅通流动,     

贵州省发展散装水泥效益显著

贵州省在全国包装大检查中,查出水泥因包装不善等原因,1983年破损散漏27万吨,造成4400万元经济损失,引起各方面注意,省政府批转了省经委关于加快发展散装水泥的意见,明确了鼓励散装水泥的经济政策,采取有关具体措施,如:国家投资,散装节约盈利提     

自控重锤探测式水泥罐料位检测装置

目前散装水泥已得到广泛使用,尤其在大型水利水电建设工地,几乎无一例外地采用了散装水泥。在大方量混凝土浇筑中,水泥罐内水泥的输进输出十分频繁。及时准确地测得罐内水泥贮量,对水泥使用及调度都是十分必要的。因此用简单可靠的方法及时测得罐内水泥的贮量是目前迫切需要解决的     

罗茨真空机组预抽阶段的抽气特性比较研究

针对罗茨泵真空机组在启动预抽阶段的三种工作模式——旁通式、直通式和变频式,分别建立了简化计算模型,推导得出罗茨泵进入正常稳态工作之前罗茨机组的有效抽速计算公式,以及被抽容器的抽气时间计算方法.通过一个计算示例,对比得出了三种不同启动预抽方式的压力-时间曲线,结果表明,直通式、旁通式、变频式工作模式下容器的抽气时间依次减...     

Optimizing the landside operation of a container terminal

This paper concerns the problem of operating a landside container exchange area that is serviced by multiple semi-automated rail mounted gantry cranes (RMGs) that are moving on a single bi-directional traveling lane. Such a facility is being built by Patrick Corporation at the Port Botany terminal in Sydney. The gantry cranes are a scarce resource and handle the bulk of container movements. Thus, they require a sophisticated analysis to achieve near optimal utilization. We present a three-stage algorithm to manage the container exchange facility, including the scheduling of cranes, the control of associated short-term container stacking, and the allocation of delivery locations for trucks and other container transporters. The key components of our approach are a time scale decomposition, whereby an integer program controls decisions across a long time horizon to produce a balanced plan that is fed to a series of short time scale online subproblems, and a highly efficient space-time divisioning of short-term storage areas. A computational evaluation shows that our heuristic can find effective solutions for the planning problem; on real-world data it yields a solution at most 8% above a lower bound on optimal RMG utilization. Research supported by Patrick Technology and Systems, the Australian Research Council Centre of Excellence for Mathematics and Statistics of Complex Systems (MASCOS), and the German Research Foundation Research Center Mathematics for key technologies: Modelling, simulation, and optimization of real-world processes (Matheon).     

螺旋槽管直管和盘旋螺旋槽管的换热性能比较

螺旋槽管是一种优良的双面强化换热管,目前国内外的研究主要集中于单头螺旋槽管的研究。采用数值模拟的方法分别研究了六头螺旋槽管直管和盘旋螺旋槽管内的换热性能。基于简化了的截面形状采用UG和Gambit对上述两类管分别进行了物理造型,并以Fluent6.3为计算工具采用realizablek-ε湍流模型对两者分别进行了数值计算并对模拟结果进行了分析和比较。     

基于集装箱装载优化的太阳能组件包装模型

针对太阳能组件包装在集装箱内的合理装载布局问题,提出了根据集装箱尺寸来设计改变运输包装件尺寸的方法。通过对运输包装件尺寸、组件产品装载数量和集装箱装载效率3者之间关系的计算,得出了较合理的太阳能组件包装模型,实现了集装箱装载效率最大化、包装方式的最优化,为行业产品包装提供理论依据和参考价值。     

Development of a process for treatment and solidification of liquid radioactive concentrates from the Leipunskii Institute of Energy Physics

Treatment of liquid radioactive concentrates (LRCs) from the Leipunskii Institute of Energy Physics using Termoksid-35 ferrocyanide sorbent was studied. After passing LRC with a volume activity of 3.9 × 10⁸ Bq l⁻¹ through a column packed with the sorbent, the volume activity of the filtrate does not exceed 3.7 × 10⁴ Bq l⁻¹. The LRC decontaminated from the major amount of radionuclides is fed to cementation. A formulation of a cement compound with a polyfunctional additive consisting of finely dispersed cement, bentonite clay, biocidal additive, plasticizer, and defoamer was developed. For the storage of a container filter with the spent ferrocyanide sorbent, it is suggested to place it in a 1 m³ metallic container in which the cement compound with the LRC decontaminated from the major fraction of cesium acts as biological protection. The γ-radiation dose rate from the 1 m³ container filled with the cement compound, with the filter with the spent sorbent placed inside, was calculated. A technology for processing of liquid radioactive concentrates from the Leipunskii Institute of Energy Physics was suggested and substantiated.     

An apparatus for easy determination of the amount of bound water in cement pastes yielding highly reproducible results

An apparatus designed for the determination of the amount of bound water in cement pastes is described. The drying of the ground paste takes place at 105 °C in a container, the temperature of which is accurately controlled by means of a solid-state proportional temperature regulator. The vapour pressure of water in the container is kept constant independent of the laboratory conditions. This is achieved by letting a small pump force air to bubble through wash-bottles containing distilled water and submerged in a water bath kept at 1°C. The conditioned air stream is heated to 105°C and led into the drying container. The ignition is carried out at 1050°C. The precision of the method and the influence of various testing conditions are discussed. A couple of examples of experimental results are given.     

基于装箱率的电视机顶盒运输包装设计

以某电视机顶盒的运输包装设计为例,在保证集装箱一定装箱率的情况下,探究了可降低物流成本的运输包装方案。首先进行了其外包装瓦楞纸箱的设计,其次,结合缓冲包装设计方法,利用UG软件,分别设计了EPS和EPE以及纸浆模塑3种材料的缓冲衬垫造型,并进行了试验数据和成本对比。提出了一套完整的运输包装设计思路,可以直接应用于实际生产。     

复杂零件数控编程KBE系统广义知识库应用研究

在分析数控编程KBE系统各模块相互联系的基础上,构建了基于KBE的复杂零件数控编程系统功能架构和广义知识库结构模型．综合数据库技术和知识库理论,建立了数控编程广义知识库系统．阐述了广义知识库的设计思想,给出了数控编程广义知识库与UG CAD／CAM应用接口实现的技术路线．并以企业需求为背景,在知识驱动型制造平台（UG CAD／CAM）上,利用VC＋＋6．0和UG／Open,将广义知识库系统和UGCAD／CAM无缝集成,实现了KBE和UG CAD／CAM系统的融合,开发了复杂零件数控编程KBE系统,验证了课题研究的可行性和实用性．     

Interpretation of the impedance spectroscopy of cement paste via computer modelling

Dielectric properties of cement pastes are measured using impedance spectroscopy, and the effective dielectric constants of the low frequency bulk arcs are reported. The unusually high values thereby obtained, and their dependence on reaction time and water:cement ratio, are explained by the presence of microstructural features that serve to amplify the dielectric constants of the individual material phases. The dielectric properties of three-dimensional cement paste models and of simple two-dimensional models of the hypothesized microstructural features are analysed. The model results provide insight into the proposed dielectric amplification mechanism in real cement paste.