配方和结构对履带销胶环疲劳寿命的影响研究

设计2种配方（炭黑用量为50份和40份）和3种结构（矩形、梯形和圆弧形）的履带销胶环,研究配方和结构对其疲劳寿命的影响。结果表明：炭黑用量小的配方履带销胶环的疲劳寿命比炭黑用量大的配方履带销胶环长;圆弧形结构履带销胶环的两侧应力小于矩形结构履带销胶环,且圆弧形结构履带销胶环的应力分布相对均匀,根部应力小于梯形结构履带销胶环。配方炭黑用量小和圆弧形结构履带销胶环的疲劳寿命长。     

油纸绝缘套管内部压强监测中温度的影响及消除措施研究

油纸绝缘套管内部发生放电或过热性故障时,内部的绝缘油和绝缘纸会分解产生特征气体,随气体的增加内部压强相应增加,从而通过监测套管内部压强可实现缺陷的监测与预警。但是环境温度和负荷电流的变化会导致套管内部温度的变化,从而引起内部压强的变化,为采用压强监测进行预警带来了干扰。为消除温度对压强预警带来的干扰,文中研究了温度对内部压强的影响规律,提出了共模抑制的方法来消除温度的影响。结果表明,该方法可以有效消除套管压强监测时的温度影响。     

亚临界机组凝汽器硝酸化学清洗

采用定期对凝汽器进行酸洗除垢,依据凝汽器冷凝管的材质,选择了四种较常见的酸种,进行溶垢及金属腐蚀试验,以检测其对水垢的溶解能力、对金属腐蚀程度以及缓蚀剂的缓蚀效果。根据小型试验结果进行筛选,最终确定用硝酸作为凝汽器酸洗除垢的有效清洗介质。     

稳定性ClO_2在电厂汽机循环冷却水处理中的应用

阐述了稳定性二氧化氯安全、高效、无毒的杀菌特性。通过其在鞍钢新钢铁齐大山铁矿热电分厂工业应用试验表明,稳定性二氧化氯杀菌剂基本不影响汽机循环冷却水pH值,杀菌率高,作用快,对汽机凝汽器铜管几乎无腐蚀作用,对膦系水质稳定剂无副作用,在电力行业的汽机循环冷却水处理中具有广阔的使用前景。     

凝汽器铜管初期腐蚀分析及对策

分析了凝汽器铜管早期腐蚀穿孔的典型案例,得出该类腐蚀的原因,提出了防止腐蚀发生的措施。     

全新型水与空气组合式冷凝器的研究开发

在叙述典型的制冷冷凝器的类型、结构及其优缺点基础上，着重介绍了一种新研究开发成功的全新型的水与空气组合式冷凝器及其优点、特点和适用范围。     

基于有限元的发动机连杆衬套温挤压工艺参数优化

以锡青铜连杆衬套为研究对象,通过Deform-3D软件进行了数值模拟。利用单一因素工艺参数试验法和正交试验优化试验方法对发动机连杆衬套的温挤压过程进行了数值模拟分析,得到了摩擦因数、温挤压速度、温挤压温度等参数在温挤压过程中对挤压力、损伤值的影响规律和显著性影响。利用极差分析得到了两组最优的温挤压工艺参数,并通过数值模拟两组较优解对挤压力、损伤值的影响规律的对比,最终得到一组最优解,即摩擦因数为0.1、温挤压速度为5 mm·s-1、温挤压温度为700℃。根据连杆衬套温挤压试验验证了使用优化后的工艺参数能够制造出表面质量高的成形件。     

Modeling and energy simulation of the variable refrigerant flow air conditioning system with water-cooled condenser under cooling conditions

As a new system, variable refrigerant flow system with water-cooled condenser (water-cooled VRF) can offer several interesting characteristics for potential users. However, at present, its dynamic simulation simultaneously in association with building and other equipments is not yet included in the energy simulation programs. Based on the EnergyPlus's codes, and using manufacturer's performance parameters and data, the special simulation module for water-cooled VRF is developed and embedded in the software of EnergyPlus. After modeling and testing the new module, on the basis of a typical office building in Shanghai with water-cooled VRF system, the monthly and seasonal cooling energy consumption and the breakdown of the total power consumption are analyzed. The simulation results show that, during the whole cooling period, the fan-coil plus fresh air (FPFA) system consumes about 20% more power than the water-cooled VRF system does. The power comparison between the water-cooled VRF system and the air-cooled VRF system is performed too. All of these can provide designers some ideas to analyze the energy features of this new system and then to determine a better scheme of the air conditioning system.     

600MW机组凝汽器真空差的原因分析及处理

华能汕头电厂600MW机组低背压凝汽器真空一直很差,通过现场试验和分析,确定影响凝汽器真空的原因是汽动给水泵密封水系统漏入了空气。为此,采取了两项技术改造措施：一是汽泵密封水回水系统加装一路排地沟;二是汽泵密封水回水系统加装密封扩容水箱。这两项措施有效地解决了凝汽器真空差的问题,提高了机组的经济性和安全性。     

Two types of a passive safety containment for a near future BWR with active and passive safety systems

The paper presents two types of a passive safety containment for a near future BWR. They are named Mark S and Mark X containment. One of their common merits is very low peak pressure at severe accidents without venting the containment atmosphere to the environment. The PCV pressure can be moderated within the design pressure. Another merit is the capability to submerge the PCV and the RPV above the core level. The third merit is robustness against external events such as a large commercial airplane crash. Both the containments have a passive cooling core catcher that has radial cooling channels. The Mark S containment is made of reinforced concrete and applicable to a large power BWR up to 1830 MWe. The Mark X containment has the steel secondary containment and can be cooled by natural circulation of outside air. It can accommodate a medium power BWR up to 1380 MWe. In both cases the plants have active and passive safety systems constituting in-depth hybrid safety (IDHS). The IDHS provides not only hardware diversity between active and passive safety systems but also more importantly diversity of the ultimate heat sinks between the atmosphere and the sea water. Although the plant concept discussed in the paper uses well-established technology, plant performance including economy is innovatively and evolutionally improved. Nothing is new in the hardware but everything is new in the performance.