35kV干式空芯并联电抗器运行情况及故障电抗器的解剖分析

干式空芯并联电抗器20世纪80年代进入系统运行，当时以干式无油、免维护获得电力用户的欢迎。然而，经运行考验证明，干式空芯并联电抗器的事故率过高，并发生多起烧损事故。章全面介绍了房山变电站35kV干式并联电抗器运行中的各次故障及事故，并介绍了发生烧损的35kV干式并联电抗器的解剖分析情况，希望这些宝贵的现场经验能对提高干式空芯并联电抗器的安全运行有所帮助。     

一种变压器在线干燥系统

变压器内绝缘纸中的含水量是影响变压器寿命的因素之一，对变压器的老化有着明显的负面影响。变压器在线干燥系统可将绝缘中的水分含量保持在一种受控状态下，可有效地干燥变压器中的水分，使绝缘中水分含量处于较低水平，有利于减缓绝缘老化进程，延长变压器的使用寿命。     

流变相-喷雾干燥法合成LiCo0.3Ni0.7O2正极材料的研究

以Co0.3Ni0.7(OH)2和LiOH.H2O为原料,在含羟基的有机溶剂水溶液中浸渍呈流变相,用喷雾干燥后于空气中在不同的温度下煅烧16h制备层状LiCo0.3Ni0.7O2正极材料,用XRD、TG-DTA、SEM以及激光粒度测试等表征了材料的晶体结构与理化性能.结果表明,由本法可降低样品合成的反应温度和对反应气氛的严格要求,制备出的样品可有效抑制材料中阳离子混排及非化学计量产物的出现,大大降低材料的首次不可逆放电容量,提高材料的首次放电效率.经700°C煅烧16h合成出的样品首次放电容量达172mAh/g,首次放电效率可达90.8%,循环40次后容量仅衰减9%,显示出优良的电化学性能.     

浅析余热锅炉循环水加药处理

转炉烟道冷却壁经常开裂 ,据分析 ,开裂的主要原因为 :水质、水处理系统及其运行过程中在锅炉系统的内部产生点蚀及局部结垢后 ,部位具有较高的热阻 ,锅炉管外壁温度不均匀 ;同时 ,冷却壁急冷急热现象频繁 ,容易在冷却壁的最薄弱处产生裂纹。处理方式为在锅炉系统中增设加药计量泵 ,连续定量加入除氧缓蚀剂及阻垢剂 ,避免锅炉管内结垢及产生点蚀 ,进而避免了锅炉管外壁温度不均匀现象的产生 ,从根本上解决了烟道冷却壁经常开裂的问题     

干熄焦旋转焦罐车设计中的几个问题

对干熄焦旋转焦罐车的开门机构、传动机构、定位机构、材料等设计问题进行了分析 ,探讨了解决的方法 ,提出了设计思路     

电解槽烟气实施干法净化综合节能治理

本文简述了我国即将淘汰的自焙槽烟气状况、改造的有效途径，以及中铝河南分公司电解厂采用逆向二段干法烟气净化新技术进行综合节能治理，在工业试验及正常运行中所取得的成绩。     

磷系阻燃聚酯纤维的研制

采用反应型阻燃剂对阻燃剂添加量不同的PET纤维进行了试纺。结果表明，对于阻燃剂添加量从4％～12％的阻燃聚酯纤维可采用同一纺丝工艺，且可纺性良好；阻燃剂添加量增大，阻燃性能提高，极限氧指数最高可达到34％左右，纤维的抗张强度减小，但强度降低不超过10％。     

不同穗型水稻产量与群体生理性状的关系

根据穗倾角穴穗颈节至穗尖的连线与茎秆延长线的夹角雪的大小,将参试的12个品种划分为直立穗型、半弯曲穗型、弯曲穗型3种类型,研究了不同穗型的群体形态生理性状与产量形成的关系。结果表明,弯曲穗型品种抽穗期干物重较高,直立穗型品种抽穗后和成熟期干物重较高,抽穗后干物重占成熟期干物重的百分比也较高,半弯曲穗型上述方面介于二者之间。直立穗型、半弯曲穗型和弯曲穗型的颖花/叶值相近,说明三者单位叶面积所负担的颖花数差异不大。就粒重/叶而言,直立穗型>半弯曲穗型>弯曲穗型。直立穗和半弯曲穗型品种抽穗后单个颖花拥有的干物质越多,成粒率越高。比叶重大的品种,抽穗后群体叶面积衰减缓慢,具有一定的群体叶面积,对干物质生产和产量的形成是十分有利的。     

Mode of zero wear in mechanical systems with dry contact

A theoretical and experimental analysis of a mechanical system with dry contact and subject to harmonic excitation is made. The adopted model is a two-degree-of-freedom system representing two sub-structures in dry contacts from their flat ground surfaces. It is theoretically shown that the two sub-structures move in phase with equal amplitudes at a particular frequency of oscillation. This particular frequency is called the frequency of virtual sticking and depends upon the physical properties of the two contacting sub-structures as well as the ratio between the amplitudes of external forces applied on these two structures in the direction of their friction sliding. Zero wear of contact surfaces can thus be established since relative velocity between encountered asperities of sub-structure surfaces becomes zero. It is shown, theoretically and experimentally, that when one of the applied harmonic forces is zero, the frequency of virtual sticking is equal to the natural frequency of the unforced sub-structure. The displacement ratio of the two contacting structures under the effect of harmonic excitation in their sliding direction is investigated within a frequency range up to 400 Hz. The tangential contact stiffness and the dynamic contact rigidity are theoretically determined and experimentally predicted from the measured forced displacement ratio.     

THERMAL DESIGN FOR HARMON DRY-COOLING SYSTEM IN LARGE POWER STATION

Based on the analysis of air flow and heat transfer in the dry-cooling tower for Harmon system, a combined iteration method is presented to solve the coupled heat transfer and draft equations derived from theoretical and empirical formulas, with the size of the exchangers and the cooling tower or the systematic parameters being determined. Taking the 686 MW unit as an example, the present calculating results are well agreed with those of the real case, and thus the method presented is practical and feasible for reasonable design of Harmon system.