气门模具H13钢的形变热处理

模具钢H13制造气门顶锻模因使用寿命不高，改变了原来工艺，采用了形变热处理新工艺，节约了能源，缩短了生产周期，降低了成本，同时提高了模具使用寿命。     

写在新财年到来时——2009，MI为你支招拼经济

自从那复杂的“次贷危机”开了头,金融海啸也跟着来了,中国GDP指数从两位数跌到个位数了,企业倒闭了,某某又被裁员了……面对这场“浩劫”,考验企业们的“抵抗力”的时候到了,而除了防守外,企业经营者们更应该主动出击。     

电弧炉工作层耐材砌衬技术改造及其经济效益

阐述了根据生产实际情况,改造了宁夏恒力集团有限公司炼钢分厂18t电弧炉工作层耐材砌衬的材质及砖型,从而降低了工人的劳动强度,提高了工作效率,降低了企业生产成本,提高了经济效益。     

2号机低压缸叶片断裂原因分析及改进措施

2号机组运行中发生了多次叶片断裂事故,严重影响了设备的安全、稳定运行。对机组历次断叶片情况进行了分析与总结,得出了故障原因,结合机组大修进行了改造,取得了良好效果。     

750 kV两站两线科研项目管理

针对兰州超高压输变电公司科研项目管理模式进行了研究与分析,提出了科研项目分解的方案,通过本方案明确了基本课题,可以较为全面、系统指导科研工作的开展,增强了科研项目实施的可操作性。构建了矩阵式科研项目管理组织结构,优化配置了公司各科研资源,明确了科研项目的各主要责任主体。确立了科研项目管理流程,做到闭环控制,加强了科研项目过程管理。     

柴油机缸套三维温度场有限元分析与试验研究

建立了柴油机气缸套数学和几何模型,确定了合理的边界条件,利用MSC有限元分析软件,进行了缸套的温度场三维有限元分析,实测了柴油机的缸套温度,验证了有限元计算的准确性。     

柴油加氢精制装置原料泵节能增容改造

介绍了柴油加氢精制装置原料泵的基本情况，重点论述了加氢原料泵改造的理论依据、额定扬程的选择，并对原料泵改造前后的参数进行了对比。此次改造效果十分明显，以120t／h流量下的参数为例进行计算，发现原料泵改造后比改造前节约功率45．8kW。此次改造有效地降低了扬程，减少了泵出口管路损失，降低了原料泵的能耗，而且提高了泵的流量，解决了制约装置加工量的瓶颈问题，也为存在相似问题的炼油装置提供了参考。     

采用喷射泵疏水方式的回热系统热经济性分析

介绍了目前凝汽式汽轮机组回热系统的基本疏水方式,分析了其优缺点。介绍了喷射泵的工作原理,建立了喷射泵工作流体流量的计算模型。提出了采用喷射泵的回热系统疏水方式,拟定了采用喷射泵疏水方式后机组的原则性回热系统简图。基于常规热平衡法,确定了喷射泵出口混合焓,并建立了机组热经济性指标的计算模型。以某300MW机组为例,计算了喷射泵的喷射系数,并对采用不同疏水方式机组的热经济性进行了比较。结果表明,采用喷射泵疏水方式机组的热经济性明显高于采用逐级自流疏水方式机组的热经济性。     

布袋式除尘器的应用

文章阐述了布袋除尘器原理,比较了电除尘与布袋除尘的优缺点,分析了布袋除尘器在火力发电厂的应用前景,提出了布袋除尘运行的建议.     

浅析火力发电厂废水集中处理设计的节约与环保效益

本文扼要介绍了丰城发电厂化学水处理专业设计中采用工业废水集中处理设计方案，简化了系统，减少了设备与用地，提高了设备使用效率，节约了能源。既达到了国家环保质量标准，叉获得了节能、节省化学药品、节省投资与运行费用等显著效益。     

城市住宅建筑供暖方式的分析

通过对辽宁省城市住宅建筑进行供暖方式和能源结构调查,在分析现状的基础上,列出了面临的问题,介绍了可能的各种供暖方式,并从一次能源利用、运行成本、初投资、适用性等方面作了评价,提出了不同现状下新旧建筑供暧方式的建议。     

Effect of hydrogen in advanced high strength steel materials

The effect of hydrogen in AHSS material (automobile and structural component) was discussed. Dual Phase steels were highly susceptible to hydrogen-related failure when working on hydrogen environment. The influence of hydrogen on TRIP steel was seen during fractographic examination where the brittle transgranular fracture was presented. TWIP steels results were inconsistent. The mechanisms which were responsible for crack growth are discussed. LIST and SSRT testing were performed for mechanical properties evaluation and SEM and TEM were used for microstructural examination of fractured samples. Simultaneous preventing methods to reduce hydrogen embrittlement such as coating, alloying and providing diffusion layer were discussed.     

汽轮机油中颗粒度及其测试方法的试验研究

简述了汽轮机油系统颗粒污染的危害，通过对比汽轮机油中颗粒度不同检测方法的结果，分析了汽轮机油运行中颗粒度升高的原因，提出了解决问题的措施。     

船舶成套管路及附属设备抗冲击性能评估研究

为充分反映出船舶管路的整体应力分布和周向应力应变的变化情况,采用壳单元建立管路有限元模型,并考虑法兰、阀门、仪表等管路附件以及吊支架对管路抗冲击性能的影响;根据BV规范对冲击能量进行转换,得出两种不同的时域曲线作为冲击载荷,对比分析了不同冲击载荷对计算结果的影响;最后对成套管路的冲击响应结果进行分析,综合评估了其整体抗冲击性能,指出成套管路的抗冲击薄弱环节。     

风电机组变速与变桨距控制过程中的动力学问题研究

讨论了额定风速以下的变速运行控制和额定风速以上的变桨距控制以及变速与变桨距两种控制策略的相互耦合关系;分析了风电机组主要部件包括叶轮、传动系统、塔架的各阶振动模态以及它们之间的相互影响力;提出了转矩控制对传动系统扭转振动和变桨距控制对塔架前后振动的影响力及控制方案;应用BLADED和MAT- LAB软件对主要控制环节进行设计及参数调整,并对机组的控制效果进行仿真。结果表明,所采用的控制策略和控制算法能够满足控制要求,并能有效地解决动力学问题。     

水泥砂浆防腐衬砌管道出现空鼓问题浅析与预防

近年来城市缺水问题日益严重,引水工程在国内如雨后春笋般出现,引水工程平原地区主要采用管道进行输水,为使地下管道有较长的寿命,在使用年限内不被腐蚀,管道防腐问题显得尤为重要,在管道防腐过程中采用混凝土进行衬砌更为普遍,而衬砌过程中出现空鼓问题比较突出。主要对管道混凝土衬砌过程中出现的空鼓问题进行分析,以及采取的主要措施进行阐述。     

Transformation of TiO2 nanoparticles to nanotubes by simple solvothermal route and its performance as dye-sensitized solar cell (DSSC) photoanode

Titania nanotubes were synthesized by simple solvothermal method using quasi crystalline TiO₂ nanoparticles as the starting material without using autoclave. In the presence of concentrated NaOH (sodium hydroxide), TiO₂ nanoparticles were transformed into nanotubes. The complete transformation of nanoparticles to nanotubes was witnessed using Field Emission Scanning Electron Microscopy (FESEM) and High-resolution transmission electron microscopy (HRTEM) images and further, the materials were found to be polycrystalline in nature. From the X-ray diffraction pattern and Raman analysis, the TiO₂ nanoparticles were found to exhibit the anatase phase and the nanotubes were found to exhibit the titanate phase. The surface area and pore size distribution were analysed using BET (Brunauer–Emmett–Teller) and BJH (Barrett–Joyner–Halenda) analysis. The surface area of the nanotubes was found to be higher compared to the initial nanoparticles and bimodal type pore distributions were observed from the BJH study. The bandgap and defect emissions of the nanotubes and nanoparticles were analysed using UV–Vis absorption and photoluminescence (PL) analysis. The chemical states of the prepared nanoparticles were further characterized using X-ray photoelectron spectroscopy. The Dye-sensitized solar cells (DSSC) were fabricated using the prepared TiO₂ nanostructures as photoanodes and their power conversion efficiencies were analysed.     

The role of electrical conductivity of substrate on the YSZ film formed by EPD for solid oxide fuel cell applications

Thick YSZ (8 mol% Y₂O₃–ZrO₂) films were coated by EPD, which was performed on non-conducting and graphite-coated NiO–YSZ composites. Weights of depositions had depended on the applied voltage linearly for both types of NiO–YSZ composites. In addition, weights of depositions were significantly higher when graphite-coated substrates were used. Uniform and dense depositions were successfully obtained by both methods. Adhesion strength was evaluated by micro hardness testing. However, it was observed that the interfacial adhesion was improved when graphite-coated substrates were used. The qualities of the deposited YSZ films were different after the subsequent sintering and cracks were developed on the surface of sintered YSZ films when non-conducting substrates were used. SEM observations showed that there were thicker YSZ films on the graphite-coated substrates than on the non-conducting ones. After the reduction process, NiO–YSZ composites were altered to Ni–YSZ cermet, which showed a good electrical conductivity all over it.     

宁波市区汽车行驶工况和污染物排放调查研究

利用GPS技术调查了宁波市不同道路汽车行驶工况,记录了实际道路汽车行驶瞬时速度的大量数据。根据数据进行了不同道路汽车行驶工况的解析,分别建立起适合宁波市汽车排放污染物测量的一般道路汽车行驶工况、快速道路汽车行驶工况、城区综合道路汽车行驶工况。分析了城市机动车排放污染的状况及影响因素,讨论了机动车车型和汽车城市道路运行工况对机动车排放污染物的影响。根据行驶工况和流量调查计算了宁波市部分道路机动车污染物排放量。     

生物质锅炉的性能论述

讨论并比较用于生物质燃烧发电的各种锅炉技术。着重介绍联美集团公司开发的循环固定床锅炉特点,为企业选择生物质锅炉提供了依据。