石化企业防爆厂房电气设计

阐述了石化企业防爆厂房的特点及产生爆炸的基本条件,说明了防爆厂房配电室设置方法及其设备正确的选型步骤和防雷接地做法等,并提出了电气设计中容易忽视的几个问题,供读者参考。     

合成气燃气轮机燃烧室的试验研究

对某分管型燃气轮机燃烧室及其两个用于燃烧中热值合成气的改造方案在中压全尺寸试验台上进行了考核和实验研究。试验采用的等容积流率模化准则,即采用与真实燃烧室相同的尺寸、燃料、过量空气系数以及燃料和空气进口温度,而空气的总压和流量以及燃料的流量取为真实参数的1/6。试验结果表明2个改造方案的性能参数,包括燃烧效率、总压损失、出口温度分布、火焰筒壁面温度分布和火焰的稳定性(贫燃料熄火极限)都能够满足设计要求。此外,与原型燃烧室燃烧轻柴油的工况相比,2个改造方案在燃烧合成气时燃烧室主燃区的火焰筒壁面温度升高,而燃烧室的NOx排放大大降低,火焰的稳定性得到明显改善。因此保持火焰筒开孔规律不变,增大气体燃料喷射孔面积并增强旋流对燃烧室进行改造,使其能够高效洁净地燃烧中热值合成气,该方法是可行的。     

GTI''s hydrogen programs: hydrogen production, storage, and applications

The use of hydrogen as an energy carrier could help address our concerns about energy security, global climate change,and air quality. Fuel cells are an important enabling technology for the Hydrogen Future and have the potential to revolutionize theway we power our nation, offering cleaner, more-efficient alternatives to the combustion of gasoline and other fossil fuels.For over 45 years, GTI has been active in hydrogen energy research, development and demonstration. The Institute has extensive experience and on-going work in all aspects of the hydrogen energy economy including production, delivery, infrastructure,use, safety and public policy. This paper discusses the recent GTI programs in hydrogen production, hydrogen storage, and proton exchange membrane fuel cells (PEMFC) and solid oxide fuel cells (SOFC).     

电站锅炉制粉系统优化与烟温偏差控制

结合运行调整，分析了300MW直接空冷机组锅炉制粉系统优化后，对锅炉两侧烟温偏差以及制粉电耗和钢球磨损率的影响，并提出了切实可行的运行调整手段。     

Electron beam evaporated carbon nanotube dispersed SnO2 thin film gas sensor

Carbon nanotube (CNT) is a useful material for gas-sensing applications because of its high surface to volume ratio structure. In this work, multi-wall CNTs are incorporated into tin oxide thin film by means of powder mixing and electron beam evaporation and the enhancement of gas-sensing properties is presented. The CNTs were combined with SnO₂powder with varying concentration in the range of 0.25–5% by weight and electron beam evaporated onto glass substrates. From AFM and TEM characterization, CNT inclusion in SnO₂thin film results in the production of circular cone protrusions of CNT clusters or single tube coated with SnO₂layer. Experimental results indicate that the sensitivity to ethanol of SnO₂thin film increases by the factors of 3 to 7, and the response time and recovery time were reduced by the factors of 2 or more with CNT inclusion. However, if the CNT concentration is too high, the sensitivity is decreased. Moreover, the CNT doped film can operate with good sensitivity and stability at a relatively low temperature of 250–300^∘C. The improved gas-sensing properties should be attributed to the increasing of surface adsorption area of metal oxide produced by CNT protrusion.     

HG-670/140-11型锅炉尾部烟风阻力特性试验研究

国电双鸭山发电厂HG-670/140-11型锅炉存在引风机出力不足、上级空气预热器入口等处氧量偏低等问题,导致锅炉满负荷工况下炉内供氧量不足、锅炉配风及燃烧状况不良,严重影响了机组的运行经济性及可靠性.根据尾部烟道各段烟风阻力、漏风试验和引风机特性试验,分析了机组不能在额定负荷下正常运行的原因,并提出了相应的解决措施.     

设计工况和非设计工况下MCFC/MGT联合发电系统基于方法的性能分析

熔融碳酸盐燃料电池是未来最具有吸引力的发电方法之一。基于分析的理论,在IPSEpro仿真平台下建立了熔融碳酸盐燃料电池/微型燃气轮机(MCFC/MGT)联合发电系统的稳态性能仿真模型。利用该模型对联合发电系统在额定工况和变工况下的稳态性能进行了仿真研究,分析了系统中各部件的不可逆性和系统的整体性能。仿真结果表明,MCFC/GMT联合发电系统具有较高的效率,且具有良好的变工况特性。     

户外交流高压SF6断路器及灭弧方式

介绍了户外交流高压SF6断路器的结构特点,以及从20世纪50年代SF6断路器的3个发展阶段和灭弧方式,并举例说明混合式灭弧的工作过程.     

电弧离子镀制备TiAlN膜工艺研究

采用阴极电弧离子镀技术在1Cr18Ni9Ti不锈钢基材上制备TiAlN膜层,镀膜装置为俄罗斯科学院UVN 0.5D2I电弧离子镀膜机,该设备由一个大功率的气体离子源和两个金属蒸发源组成.气体离子源具有气体离子轰击和辅助沉积的特点.研究了电弧电流、负偏压和气体离子源功率等工艺参数对膜层的影响规律.实验结果表明:气体离子源具有明显的细化金属颗粒的作用.提出了制备TiAlN膜层的最佳工艺,得到了厚度为5 ～10μm、相结构为Ti0.5Al0.5N、显微硬度为1200HV0.01的TiAlN膜层.     

平顶山十矿煤与瓦斯突出地质因素分析

随着矿井开采深度的增加,煤与瓦斯突出已愈来愈成为影响和制约生产的重要因素.为确保煤矿安全生产,作者对平顶山十矿影响突出煤层瓦斯赋存和突出的地质构造、煤层厚度的变化、煤体结构、埋藏深度等地质因素进行了分析研究,认为:地质条件对煤层瓦斯体积含量和煤与瓦斯突出的分区分带具有明显的控制作用;井田内厚度小于2 m的单一煤层一般不具突出危险性,但随着开采深度的增加有可能发生突出;戊9-10煤层分叉合并线附近为煤与瓦斯突出带,其他煤层分叉合并线附近可能形成煤与瓦斯突出危险带.