FGH96合金中γ′和碳化物相平衡计算

利用热力学计算软件Thermo-Calc及相应的Ni基数据库对FGH96粉末高温合金中可能析出的平衡相进行计算,并分析元素含量在允许范围内的波动对主要析出相γ′和碳化物析出行为的影响。结果表明:FGH96合金析出的平衡相有γ′、MC、M23C6、MB2、M3B2和TCP相。Al、Ti和Nb含量的增加会显著提高γ′相的固溶温度及析出量;合金中碳化物的析出量及MC的析出温度主要受到碳含量的影响,Al和Nb含量的变化对碳化物的析出温度有着显著影响,其中Al含量的影响尤为明显。     

基于LabVIEW的智能家居监控系统设计

信息技术的高速发展改变了人们的家居理念,建立一个高效、低成本的智能家居环境已成为人们关注的焦点。以图形化软件LabVIEW2012为开发平台,选用NIUSB．6009数据采集卡、SIM300GSM模块和USB摄像头,设计了一种智能家居监控系统。系统实现了对家居室内温度、湿度、光照度、燃气烟雾和安防状态等环境参数的实时监控及远程GSM短信息报警,该系统运行可靠,人机界面友好,易于操作,可扩展性强,且测试成本低。     

基于S7-300 PLC的泥沙输送实验台数据采集系统设计

本文提出一种基于S7-300 PLC的泥砂输送实验台的数据采集方案。该系统采用CPU模块和上位机组成中央控制站,分布式I/O模块组成现场工作站,设计PLC数据缓存程序,实现数据采集。上位机与PLC之间的数据传输采用OPC服务器,OPC客户端软件采用VC++编程开发。     

Experimental and theoretical studies of anti-ulcer drugs with benzimidazole rings as corrosion inhibitor for copper in 1 M nitric acid medium

The adsorption effect of esomeprazole (ESP) and lansoprazole (LP) on corrosion behavior of copper in 1 M HNO₃ solution was investigated using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and weight loss measurements. The experimental results indicate that both ESP and LP inhibited the corrosion of copper in nitric acid solution and the inhibition efficiency increased as the concentration of the compounds increased. EIS measurements confirmed that the charge transfer resistance increases on increasing the inhibitor concentration. Polarization measurements showed that the inhibitors are of mixed type. From the weight loss measurements, the inhibition efficiency of the inhibitors was found to vary with concentration, immersion time, and temperature. The adsorption of inhibitors on the copper surface follows Langmuir isotherm. The surface morphology was examined by scanning electron microscope and atomic force microscope. Further, the computational calculations are performed to find a relation between their electronic and structural properties.     

Modeling of the Extraction Equilibrium of Copper from Sulfate Solutions with Acorga M5640

The extraction equilibrium of copper from sulfate media with the aldoxime Acorga M5640 in ShellSol D70 has been investigated. The distribution results were interpreted by taking into account the nonideality of the aqueous phase. The activity of copper and hydrogen ions in the target systems CuSO₄/H₂SO₄/Na₂SO₄ and CuSO₄/H₂SO₄/Fe₂(SO₄)₃/ZnSO₄ were calculated through the speciation of the aqueous solutions and by applying the Pitzer model. The experimental pH values were found in good agreement with the predicted pH values. A model considering the dimerization of the aldoxime extractant was proposed to predict the distribution ratio and the copper loading isotherms. The extraction constant at infinite dilution and the apparent dimerization constant were evaluated from the experimental data and were found to be 10^{3.06 ± 0.07} and 51 ± 9 M^?1, respectively, at 25°C.     

纸张荧光增白剂对色彩复制的影响研究

目的 探究纸张荧光增白剂含量(OBA)对色彩复制的影响,有利于准确测量颜色并实现色彩在不同设备间正确转换,准确复制颜色。方法 选择含较多荧光增白剂、含少量荧光增白剂、不含荧光增白剂3种类型的纸张,分别基于M1/M2的观察条件,测量纸白、CMYK线性色表以及IT8.7/4色表,分析M1/M2观察条件下Δb^*、ΔE^*值以及ICC曲线变化趋势。结果 在M1和M2观察条件下测量纸张基色b^*值的差值绝对值可以确定基材中的OBA的含量,且OBA含量对颜色测量数据的影响与阶调值相关,基本呈负线性关系;在M1观察条件下测量数据生成ICC色彩特性文件,整体线性偏移蓝色,即b^*值往负值线性偏移。结论 基于M1观察条件的色彩管理流程,需进一步研究荧光增白剂含量对b^*值进行线性补偿校正的影响,从而减少纸张荧光增白剂对色彩管理的影响,使纸张上的颜色复制达到理想状态。     

330 MW机组凝汽器换型改造及节能效果分析

针对山东省十里泉发电厂330 MW凝汽式机组凝汽器铜管频繁泄露问题,阐述了将凝汽器进行换型改造的必要性,提出了凝汽器改造方案并进行了实施,消除了凝结水质超标、凝汽器背压增高的现象,并通过实验数据计算得出了凝汽器换型改造后产生的节能效果.实践证明,通过凝汽器换型改造,达到了显著节能效果,值得在同类型机组中推广.     

双尺度低氮燃烧技术在国产330MW机组的应用

为了达到宁夏地区要求现役330MW级别火电机组NOx排放值100mg／Nm^3以下和改善环境的目的,青铜峡铝业发电有限责任公司对1号锅炉的燃烧器进行技术改造。结果表明：改造后锅炉在330MW负荷下NOx排放平均值为240mg／Nm^3,比改造前降4R,45％;锅炉效率达到93．39％（高于设计值0．01％）、飞灰含碳量2．98％（低于设计值0．02％）、过热器减温水量和再热器减温水量均小于设计值;有效解决了锅炉改造前的结焦和超温现象。     

某电厂300MW机组节油燃烧的技术改进

发电厂机组启动初期,主要通过燃烧柴油点燃油枪启动,这需要燃烧大量的柴油.由于柴油的价格远高于煤的价格,为了在机组启停过程和正常运行中尽量节省用油,减少燃油消耗,提高经济效益,分析了某电厂自建厂以来在节油燃烧方面的诸多技术改进.前期利用锅炉余汽提供雾化自汽进行启动,省去启动锅炉的点火运行以节油;后期采用微油点火方式提前投用煤粉,从而实现以煤代油,达到节油燃烧的目的.改进后的经济性分析表明,节油技术为电厂节约了成本,提高了经济效益.     

Chemical synthesis and properties of La1.9Ba0.1MO1.9Mn0.1O9 as electrolyte for IT-SOFCs

The highly phase-pure electrolyte materials with compositionLa1.9Ba0.1MO1.9Mn0.1O9（LBMMO） was prepared by the sol-gel auto-combustion method for intermediate-temperature solid oxide fuel cells （IT-SOFCs）. The details ofgel＇s auto-combustion, phase evolution, sintering, thermal expansion and electrochemical performance of LBMMO were investigated by means of thermo-gravimetry （TG）, X-ray diffxaction （XRD）, scanning electron microscopy （SEM）, transmission electron spectroscopy （TEM）, thermal expansion curve （TEC） and complex impedance spectra. The results showed that the highly phase-pure electrolyte LBMMO could be obtained after calcining at 600 ℃. The sample sintered at 900 ℃ for 4 h in air exhibited a better sinterability, and the relative density of LBMMO was higher than 96%. The electrical conductivities of the sample were 6.7x 10-3 and 25.9× 10-3 S/cm at 700 and 800 ℃ in air, respectively. Results also showed that LBMMO had moderate thermal expansion （a=16.3×10-6 K-l, between room temperature and 800 ℃） and an electrical activation energy equal to 1.32 eV）.