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 共查询到20条相似文献,搜索用时 140 毫秒
1.
晏蓉  赵思安 《冶金能源》1995,14(6):36-39
动力用劣质煤燃烧特性研究(下)晏蓉,赵思安,郑楚光,周燕陵,曾羽健(华中理工大学煤燃烧国家重点实验室)STUDYONTHECOMBUSTIONCHARACTERISTICSOFINFERIORPOWERCOAL(THE2NDHALF)¥YaoRong...  相似文献   

2.
基于计算机仿真优化的钢管冷拨过程CAD系统   总被引:2,自引:1,他引:1  
韩宝云  金明 《钢铁》2000,35(3):34-38
为了开发一个特殊的钢管冷拨工艺过程CAD系统,除考虑现场实际资料与经验外,还利用MARC软件进行约1000次的钢管冷拨过程计算机仿真模拟。这些仿真试验覆盖各种可能的工艺变形条件,仿真研究的结果经过分析处理,模型化而直接引入CAD系统中,使该CAD系统可以寿命各冷拨企业快速有效地优化的拨制规程。  相似文献   

3.
钢结构施工图CAD一直是困扰工程界的难题之一,本文分析了到目前为止微机上已有的几种钢结构CAD方法的优点及局限,提出我们对钢结构施我图CAD方法的思路,并介绍了在此思路指导下开发的钢结构通用CAD软件包SNCAD。通过实践,证明了本文提出的思路和方法是可行的。  相似文献   

4.
针对现场实际情况,采用常用的变形模型及力能参数模型,应用C语言进行程序设计,在此基础上采用Auto-CAD软件设计出一套实用的槽钢CARD系统。  相似文献   

5.
文中简要概述了我国采矿CAD的发展现状及其存在的问题,指出了开发集成图形环境采矿CAD的必要性,介绍了一个基于ADS采用原型法在AutoCAD平台上用C语言开发的露天矿采剥计划CAD系统,认为利用ADS技术开发采矿CAD大有所为。  相似文献   

6.
陆松年 《宽厚板》1996,2(5):1-8
本文剖析了法国BERTIN&CIE在线快速冷却(ACC)和而后发展的直接淬火(DQ)技术,提出舞钢轧钢厂把ACC和DQ装置作为线热处理线主要设备的设想和要解决的问题。  相似文献   

7.
吴伯清 《冶金能源》1996,15(5):60-65
日本鹿岛制铁所热轧厂降低加热炉单耗的技术措施TECHNICALMEASURESFORREDUCINGUNITCONSUMPTIONOFFURNACEATHOTROLLINGMILLOFNIPPONKASHIMAIRONMAKINGCORP¥//日本住...  相似文献   

8.
本文阐述了如何将JXCAD挂接在AUTOCAD12.0版本上运行,使AUTOCAD12.0与JXCAD都充分各自优点,互相取长补短。  相似文献   

9.
有关采矿CAD开发技术的研究   总被引:1,自引:0,他引:1  
根据我国采矿CAD的发展现状,论述了有关采矿CAD的开发技术和方法,指明了采矿CAD的发展方向。  相似文献   

10.
侯运炳  魏书祥 《黄金》1999,20(7):15-18
根据矿山建设项目优化设计的需要,在AutoCADforWindows支持下,利用ADS(AutoCADDevelopmentSystem)开发计算机辅助采矿设计软件,文中介绍的CAD软件在北铭河矿山建设项目的优化设计中发挥了重要作用。  相似文献   

11.
高健 《冶金分析》2021,41(1):55-62
明确物相变化是剖析钛渣酸解机理和改进酸解工艺的关键点之一.综合应用化学分析、X射线衍射(XRD)分析、矿物解离分析以及扫描电镜形貌分析对某74钛渣酸解过程中主要物相的含量、形貌变化以及Ti、Si两种元素的含量及赋存变化进行了研究.结果表明:钛渣主要由黑钛石和辉石组成,酸解过程中黑钛石含量逐渐减小,辉石含量逐渐增加;反应...  相似文献   

12.
对工业革命的发展特点进行了评述,对3.0和4.0的建设过程进行了描述,强调了信息化建设期间应注意的几个问题。在此基础上分析了河钢石钢公司的现状,对河钢石钢公司的发展阶段进行了定义。讨论了河钢石钢公司发展智能制造的必要性和可行性。在阐述作者对智能制造的理解之后,提出了河钢石钢应借搬迁之良机按发展智能制造的思路规划建设。还就河钢石钢建设智能制造3.0和4.0的若干问题提出了具体建议,指出智能制造建设将是一个长期的、持续的升级过程。  相似文献   

13.
The Hale Boggs Bridge opened to traffic on October 5, 1983. At the time, it was the first U.S. cable-stayed crossing over the Mississippi River. The PE (polyethylene) protective sheathing was damaged in many of the cables before and during installation, and after the opening of the bridge to traffic. Repairs were attempted to correct the defects in cable sheathing. Many of the repairs performed poorly and failed to protect the main tension element. The condition of 39 out of 72 cables indicated a critical need for repair and timely action was recommended. To address these damages, and to assure the structural integrity of the bridge structure, several strategies involving a range of repair and replacement options were evaluated using life cycle cost analysis. It was concluded that the strategy to replace all cables presents the best value among evaluated alternatives. The design of the complete 72 cable array replacement is the first occasion on which this process is attempted in North America. The final design of the replacement cables is heavily influenced by the geometric restrictions of the existing anchorage locations. The replacement cables are being designed for a 75-year design life and incorporated with the latest advancements in corrosion protection and vibration control. Maintenance of traffic design is an essential part of the project. The bridge is a critical regional link and constitutes a hurricane evacuation route. Traffic maintenance during cable replacement was designed to be as unobtrusive to the public and commerce as practical. This paper describes efforts associated with cable condition assessment, rehabilitation strategy, and design considerations and concepts, undertaken by the writers since 2002 to improve the condition of this major river crossing.  相似文献   

14.
浓密床层导水通道分布特征及通道内部的细观渗流机制是影响全尾砂重力浓密效果的关键因素。利用连续浓密试验与CT扫描技术相结合的方法研究剪切作用对床层孔隙分布特征的影响,将扫描结果导入COMSOL软件进行床层内部液体逆向渗流规律模拟,揭示剪切作用对排水过程的影响机理。结果表明:在给料浓度为10%,絮凝剂浓度为0.01%时,无/有剪切作用下连续浓密平均浓度分别为50.10%和55.82%;内部孔隙率分别为49.90%和44.18%。无/有剪切作用下导水通道数量分别为6和2,剪切作用使导水通道的数量降低了66.7%;流出通道数分别为6和1,流出通道数量降低了83.3%;通道内液体最大渗流速度分别为9.574×10-6 m/s和2.592×10-6 m/s,出口最大流速分别为5.372×10-6 m/s和1.468×10-6 m/s;孔隙表面最大压力值随着液体逆向渗流逐渐降低。剪切前导水通道呈开放连通状态,排水后孔隙体积减小,导水通道闭合,床层浓度进一步提高。导水通道数量的降低说明剪切作用实现了床层的强化排水,为膏体材料的制备奠定基础。  相似文献   

15.
The task demand assessment (TDA) is a new technique for measuring the safety risk of construction activities and analyzing how changes in operation parameters can affect the potential for accidents. TDA is similar to observational ergonomic methods—it does not produce estimates of probabilities of incidents, but it quantifies the “task demand” of actual operations based on characteristics of the activity and independent of the workers’ capabilities. The task demand reflects the difficulty to perform the activity safely. It is based on (1) the exposure to a hazard and (2) the presence and level of observable task demand factors—that is, risk factors that can increase the potential for an accident. The paper presents the findings from the initial implementation of TDA and demonstrates its feasibility and applicability on two different operations: a roofing activity and a concrete paving operation. Furthermore, the paving case illustrates how the TDA method can compare different production scenarios and measure the effect of production variables on the accident potential. The findings indicate that the method can be applied on activities of varying complexity and can account for several risks and task demand factors as required by the user. The selection of task demand factors is a key issue for the validity of the method and requires input from the crew and safety management. The limitations of the methodology and the need for further research are discussed. Overall, TDA provides a tool that can assist researchers and practitioners in the analysis and design of construction operations.  相似文献   

16.
摘要:采用光学显微镜、扫描电镜、透射电镜、弯曲共振试验机和万能材料试验机等分析了复合添加质量分数0.8%Ni元素和0.1%Nb元素的Fe-Cr-Mo合金组织和析出相的大小、形态,研究了Ni和Nb元素的添加对Fe-Cr-Mo合金力学性能和阻尼性能的影响。结果表明,Ni和Nb元素的加入不但使合金晶粒显著细化,而且有效抑制了富Cr析出物的析出,使析出物明显细化且分布弥散。晶粒和析出物的细化同时提高了合金的强度和塑韧性,尤其是显著地提高了材料的塑性。1000和1100℃退火后,Ni和Nb元素的加入将提高减振合金的矫顽力,降低磁致伸缩系数,使减振合金的阻尼性能降低。900℃退火后,Ni和Nb元素的添加虽然提高了合金的矫顽力,但由于Mo元素的回溶使磁致伸缩系数增大,阻尼性能获得提高。  相似文献   

17.
随着环境保护压力的增加,中国钢铁公司的高炉炉料结构中酸性料(球团和块矿)配比显著提高,尤其在冬季取暖季的时候。但是,各钢铁公司的资源条件不同,采用高比例酸性炉料冶炼时,有的钢铁企业获得较好的生产指标,但也有钢铁企业操作指标不佳或难以实现高比例酸性料操作。基于此,以提高高炉酸性料比例和降低生产成本为目的,分析了高比例酸性料所带来的问题,并提出了应对高比例酸性炉料的技术措施。高比例酸性料对高炉冶炼的影响主要体现在块状带和软熔带。对块状带的影响主要有,粒度的差异导致空隙率降低;堆积性能的差异导致料面难以控制;还原产生的粉末影响高炉块状带的透气性。对软熔带的影响主要有,酸性料自身软熔温度较低;还原度较低导致矿石进入软熔带前FeO含量高,使得软熔带位置上移且变宽;软熔带焦窗长度变长,增加整个焦窗的压力损失。应对高比例酸性炉料的具体措施有,合理选择优质酸性炉料;制备碱性镁质球团;采用合理的布料制度尽量克服球团矿对料面的不利影响;高炉精细化用焦,充分发挥大块焦与小焦丁的特点与功能。能够改善块状带和软熔带透气性的技术措施都可以缓解高比例酸性料对高炉冶炼的不利影响,各生产企业可结合自身的资源情况和炉型特...  相似文献   

18.
海绵钛产品中的杂质含量是反映海绵钛质量和还原蒸馏水平的一项重要指标,杂质的分布是影响海绵钛等级划分的一个重要因素。采用电感耦合等离子体原子发射光谱法(ICP-AES)测定样品中Fe、Mn杂质的含量。根据已测得的数据,做出了Fe、Mn含量(质量分数)在钛坨中的分布规律图,对钛坨中Fe、Mn杂质的分布进行了研究。结果表明,Fe杂质含量在海绵钛坨中心部分最低,其次是在中心部位的上部和下部,越接近器壁和底部含量越高,底皮和靠近底部的边皮是含铁量最高的部位。Mn杂质含量在海绵钛坨中上部分最低,其次是中上部分的上部和下部,越朝向底部含量越高,底皮是Mn含量最高的部位。  相似文献   

19.
 为了建立评价脱磷炉半钢冶金效果的指数,在常规转炉冶金效果分析时,ISCO(Index for Selective Carbon Oxidation)指数、BOC(Balance of Oxygen and Carbon feeding rate)指数和炉渣TFe、脱磷率等冶金效果有较好的对应关系,转炉终点碳氧积可以综合考虑转炉终点碳质量分数及氧质量分数,这3个指数均可以用来衡量复合吹炼转炉冶金特性。然而在脱磷炉半钢冶炼效果并没有衡量的指数,建立选择性脱磷脱碳指数ISPC(Index for Selective dePhosphorization and deCarburization),并将该应用于脱磷炉工业生产的数据分析中,可以用来综合反映半钢冶金效果。ISPC指数越高表明脱磷保碳效果越好,半钢碳质量分数随着ISPC指数的增加而增加,半钢磷质量分数随着ISPC指数的增加而降低。半钢温度和底吹强度是影响ISPC指数的主要因素。ISPC指数随半钢温度的降低而增加,低温使得磷的氧位低于碳元素,脱磷保碳程度更好。ISPC指数随着底吹强度的增加而增加,并能较好地反映出炉底状态和动力学条件。  相似文献   

20.
This paper presents the development and validation of a numerical model for simulation of the flow of water and air and contaminant transport through unsaturated soils. The governing differential equations include two mass balance equations for the water phase and air phase together with a balance equation for contaminant transport through the two phases. In the model the nonlinear system of the governing differential equations was solved using a finite-element method in the space domain and a finite difference scheme in the time domain. The governing equation of the miscible contaminant transport including advection, dispersion-diffusion and adsorption effects are presented. The mathematical framework and the numerical implementation of the model are described in detail. The model is validated by application to standard experiments on contaminant transport in unsaturated soils. The application of the model to a case study is then presented and discussed. Finally, the merits and limitations of the model are highlighted.  相似文献   

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