机组初参数的热经济性模型研究及其应用

以汽轮机功率方程为基础,应用偏微分理论,根据汽轮机变工况的基本原理以及各参数之间的变化关系,经过严格的数学推导,得到了主蒸汽参数变化对机组热经济性影响的数学计算模型。此外,还以N600-16.7/537/537-I型汽轮机的运行数据为例,对模型进行验证。计算实例表明:该模型具有计算结果准确、使用方便、通用性强等特点,适用于工程实际应用,对机组性能监测和优化运行有重要意义。     

XQG型石墨二合一氯化氢蒸汽炉及其应用效益

本文对XQG型石墨二合一氯化氢蒸汽炉的结构、性能进行了介绍,并分析了其应用效益。     

强化物资和下包管理,精确项目成本控制

根据精泰电子(上海)有限公司在企业发展中遇到的管理问题,提出相应的解决方案和实施过程,并在实践中取得了良好的实际应用效果。     

Engineering practice of reducing ground subsidence by grouting into overburden bed-separated and similar model experiment

The subsidence prediction theory under the condition of grouting into bedseparated was developed. Reducing ground subsidence by grouting was carried out on eight fully-mechanized top-coal caving faces, by using the continuous grouting in multiple-layer to obtain experiment results of reducing subsidence under fully mining. The similar material model that can be dismantled under the condition of constant temperature and constant humidity was developed. The model was used to simulate the evolution of overburden bed-separated under such constraints of temperature and humidity, at the same time, and to test the hardening process of similar materials.     

Numerical Simulation on Effects of Pressure Distribution of Wind Turbine Blade with a Tip Vane

It is important to study the pressure distribution on the blade and in the adjacent area while searching the poweraugmentation theory with adding a tip vane to the wind turbine.This paper shows the CFD simulation relation-ship of the pressure distribution on the rotor blade and in the adjacent area,after calculating the pressure of thedifferent chordwise and spanwise point on the blade with the tip vane-V(8.8x8) and without the tip vane under tipspeed ratio λ4.5.Combining the isobaric section figure in certain location,it can be seen that the tip vane im-prove the pressure difference between pressure and suction surface.The most influenced zone is found and thesecan further display the power augmentation theory of the wind turbine using the tip vane.The simulation calcula-tion was based on N-S equations.3-D,steady,implicit solver was chosen.Turbulence model was k-ω SST.Dis-cretization scheme is SECOND ORDER UPWIND.Pressure-velocity coupling was a typical SIMPLE scheme.Inthe whole grid system,two-divided grid formation was adopted,that is,inner region and outer region.Inner re-gion including rectangular solid blade and neighboring,outer region is semi-cylinder.There were together720,000 nodes with tetra-prism unstructured mesh.     

天丝/竹浆纤维/牛奶纤维/真丝混色纺细特转杯纱的研制

介绍了天丝、竹浆纤维、牛奶蛋白纤维、真丝的规格特性及其混色转杯纱的主要特性,探讨了混色纺细特转杯纱生产中的主要工艺参数、技术措施和注意事项。     

SINOPEC’s Successin Fixed-bed Methanol-to-Propylene PilotScale Tests

正The first in China pilot tests of fixed-bed methanol-topropylene unit were successfully implemented at the Yangzi Petrochemical Company(YPC).It is told that this technology has opened up a new process for production of propylene through coal gasification,and China has possessed both the fluidized-bed methanolto-propylene process(F-MTP)and the stationary-bed     

自适应机翼的发展现状及其关键技术研究

综述了近二十年来国内外自适应机翼技术的研究现状以及该领域需要解决的关键技术,对未来这一技术的发展和应用进行了展望。     

中热固相法制备掺杂钛的钒酸锂正极材料

以Li2CO3和V2O5为原料,用中热固相法制备了掺杂Ti4+的锂离子电池正极材料Li1.1V3―yTiyO8(y=0.05、0.1、0.2),并对其电化学性能进行了研究。研究表明,掺杂Ti能够很好地改善中热固相法产品的电化学性能,且当y=0.1时,Li1.1V3―yTiyO8循环性能最好,首次放电比容量高达250.9 mAh/g。     

A new method for estimating initial rotor phase of self‐excited hybrid‐field synchronous motors

This paper proposes a new method for properly estimating the rotor initial phase (i.e., the position) of the newly emerging self‐excited hybrid‐field synchronous motors (SelE‐HFSMs), which have the rotor held by both a permanent magnet and a diode‐shorted held winding. The proposed method injects a spatially rotating high‐frequency voltage and detects the rotor phase directly by evaluating the norm of the associated current. The method is very simple, but has a high degree of usability. 2010 Wiley Periodicals, Inc. Electr Eng Jpn, 173(3): 49–58, 2010; Published online in Wiley InterScience ( www.interscience. wiley.com ). DOI 10.1002/eej.21027