超临界直接空冷排汽管道系统内流场的数值模拟

排汽管道布置形式和内部结构是直接空冷排汽系统优化设计的基础,直接影响各蒸汽分配管内的流动阻力和流量分配。利用计算流体动力学软件（CFD）,对某660MW超临界直接空冷机组排汽管道内的水蒸汽流场进行了数值模拟。通过对三维排汽管道内水蒸汽流场的模拟、分析和研究,为直接空冷排汽管道系统的优化设计提供帮助。     

汽机排汽在回水管内加热空冷凝结水之弊

重点介绍用汽机排汽在回水管内加热空冷凝汽器凝结水的弊端。简要介绍为漳山发电公司二期工程600MW直接空冷机组专门设计的多功能排汽装置，并建议该工程重新考虑使用此排汽装置。     

亚临界600MW两缸两排汽直接空冷汽轮机的研制

介绍了东汽亚临界600MW两缸两排汽直接空冷汽轮机的特点,详细分析了34＂空冷末级叶片和两排汽空冷低压模块的性能特点。从而说明该600MW空冷汽轮机结构合理、技术先进、性能优越、安全可靠。     

大型直接空冷汽轮机排汽装置研制及应用

阐述了为取代当前国内、外普遍采用的方变圆排汽接管,东方汽轮机厂研制的直接空冷汽轮机排汽装置,使之由单一功能变为多种功能,成为方变圆接管的换代产品。直接空冷汽轮机排汽装置通过采用新开发的新型支座、限位装置和凝结水在排汽装置内回热等创新技术,从而成为国内直接空冷汽轮机组的标准配置并得到广泛应用。     

1000MW直接空冷机组排汽管道内湿蒸汽的数值模拟

排汽管道是空冷岛重要的系统和部件,其管线布置方式是否合理,管内压降及蒸汽流量分配均匀性是否满足设计和使用要求,影响到空冷凝汽器的运行效率和冬季的防冻维护,是直接关系到发电机组经济运行和安全的大问题。应用ANSYS、FLUENT等计算流体力学软件(CFD)对某1000MW直接空冷机组排汽管道内的湿蒸汽进行了数值模拟,并对模拟结果进行了简要分析、研究。为直接空冷机组排汽管道的设计选型提供了参考依据,并对直接空冷机组排汽管道的进一步优化设计提供帮助。     

300MW直接空冷机组排汽装置的三维数值研究

采用SIMPLE算法和κ-ε模型,对内王低压加热器的300MW直接空冷机组排汽装置的内部漉场进行了三维数值模拟,得到了整个排汽装置内部流场的速度分布情况.结果表明,由于内王式低压加热器的影响和裤汽装置接颈部棱台的扩散作用使排汽装置接颈出口流场速度分布产生很大的不均匀性,从而导致蒸汽在排汽装置内流动的汽阻和压损增大,最终影响到机组运行的经济性.该数值模拟结果对直接空冷汽轮机择汽装置的完善化设计及改造,具有一定的指导作用.     

50 MW太阳能轴排空冷排汽装置的设计研究

介绍总结了新设计的50 MW太阳能轴排空冷项目排汽装置的作用、结构特点、连接以及真空推力的平衡形式。在强度方面,采用了有限元的分析方法校核了排汽装置的力和力矩,并运用CFD软件对排气装置的压损进行了计算。结果表明该设备结构简单,易于布置且具有强度高、压损小的特点。该新型排汽装置的研制可为后续空冷轴排项目提供借鉴和参考。     

对直接空冷机组排汽装置的发展趋势的研究

随着空冷机组容量的不断扩大,排汽装置已由单一型逐渐地向多功能型发展。较为详细地介绍了设置除氧功能排汽装置的必要性,阐述了除氧装置的几种布置结构,并对具有表面式换热器的排汽装置的应用特点进行了简要描述。     

空冷机组凝结水真空除氧在排汽装置的应用

该文针对目前直接空冷机组凝结水、疏水回收系统系统复杂、凝结水含氧量高、影响机组运行经济性、安全性等问题，提出了改进措施。在直接空冷汽轮机排汽装置中进行凝结水真空除氧。采用在排汽装置中进行凝结水真空除氧的方法，简化了系统，降低了凝结水过冷度。提高了机组的热经济性，并解决凝结水含氧量超标问题。建议在工程上推广应用。     

直接空冷系统排汽管道特性研究

为了研究直接空冷机组排汽管道内水蒸汽的流动特性,采用CFD技术,对某台200MW直接空冷机组排汽管道内的水蒸汽流场进行了三维数值模拟.根据数值计算结果,在直接空冷大直径排汽管道内的弯头和三通等处安装导流叶,不仅有利于减小工质在管道内的流动阻力和实现管道内工质的均匀分布,而且有利于提高直接空冷系统的整体热效率.     

双平行平面射流输运特性研究

平行射流输运特性研究具有较重要的理论意义和工程价值,对水平浓淡煤粉燃烧也有较重要的意义。本文实验研究了双平行平面射流动量、能量和质量输运,结果表明：速度分布表现为双射流相互吸引并最终汇合成单一射流;温度分布反映了冷射流为加热射流所卷吸;浓度分布反映了惯性力的占优作用。三种变量分布反映了动量、能量和质量输运性质的根本性区别。     

Co-Carbonization of Two Anthracites with a Fat Coal or Two Pitches

The blends of two anthracite powders (YQ and JC) with a fat coal (C4) or a petroleum pitch (PP) or a coal tar pitch (CTP) in different proportions were co-carbonized at 3°C/min up to 1000°C in an experimental 1 Kg coke oven. Coke yield, coke particulate size, coke micro-strength and coke cracking strength were measured respectively. Coke optical textures were watched under a microscope. The results show that as anthracite proportion increases, coke yields of all blends improve; > 0.8 mm lump coke yields of blends with CTP or PP decline slightly, blends with C4 drop heavily; coke micro-strengths do not change sharply, and coke cracking strength of blends with C4 or PP decrease more than blends with CTP. C4 produces fine-grained mosaics, and two anthracites are mainly fusinite and fragments, PP is coarse-grained mosaics, and CTP is chiefly flow or domain textures. Independent optical textures were observed in cokes. There exist evident borders between the two contact optical textures which were produced by different components, and a few phenomena that domain or flow textures penetrating into fusinite appeared in the blends. It seems that CTP is the best adhesives for blending with anthracites for producing high quality cokes.     

Two simple and novel pyrheliometers

Two simple and novel pyrheliometers have been designed and constructed based on a new methodology to measure solar irradiance. They are respectively the double-sensor and the single-sensor methods. The sensor surface is made of heavily oxidized stainless steel foil, which is formed as a circular disk and thermally joined to a large stainless steel ring acting as a heat sink. For the former method, through respectively measuring the temperature differences between the two sensors' center points and the heat sink, the incident solar irradiance and the heat-loss coefficient on the sensor's surface can be determined using thermal equilibrium equations under steady-state conditions. For the latter method, the ratio of solar irradiance to the temperature difference between the single-sensor's point center and the heat sink is a constant. The constant depends on the geometric dimensions, thermophysical properties of the sensor and the heat-loss coefficient. It can be calibrated using a standard pyrheliometer. Comparing a calibrated TMI Mark-VI pyrheliometer with the double-sensor pyrheliometer, the maximum relative deviation and the standard deviation are less than 3.0% and 2.7%, respectively. For the single-sensor pyrheliometer, the corresponding deviations are 3.1% and 1.5%, respectively. The instruments are simple and inexpensive. Their accuracy can meet the need of routine measurements of solar irradiance.     

Two stage linear Fresnel lenses

A new design of a second stage reflective element, which is closely related to the earlier trumpet configuration, is presented. The implementation for linear Fresnel lenses is derived, leading to high solar concentration with both convex and flat lenses.     

瑞典克里斯船舶公司推出三种现场柴油机修复设备

瑞典克里斯船舶公司和最近合并的IOP船舶公司联手为现场修理发动机推出了一种便携式阀杆磨床（PVG）和一种便携式密封面车床（PSL）。     

出口轴瓦失效分析两例

华康汽车配件有限公司先后接到境外客户的两次轴瓦失效投诉。我们根据所寄回的损坏轴瓦实物进行了实事求是的分析和答复，均得到对方的认可而未进一步提出异议。在此对两次分析作一介绍，与业内同行交流。     

汽水两用锅炉的开发与应用

汽水两用锅炉是一种极具市场发展潜力的节能产品,文中介绍了WNS型汽—水两用锅炉的性能和结构特点及运行调节方法,并对锅炉设计过程中的关键环节进行了阐述。     

浅述两种专用车削夹具

本文介绍了两种气缸套车削加工用夹具:弹性套和单锥涨套的构造特点以及它们各自适用的范围.     

关于两部制电价问题的研究

针对我国当前两部制电价的执行情况,重点研究了在我国电网实行商业化运营的情况下,上网电价和互供电价实行两部制电价的必要性及可行性,并提出了适合我国国情的两部制电价的改进思路和办法．     

Two axis tracking system for solar concentrators

A two axis tracking system is described for the focussing of sunlight in paraboloid-type solar reflectors used in solar thermal devices like solar cookers. This system consists of wormgear drives and four bar type kinematic linkages for effortless and accurate focussing of reflectors at low cost.