京能热电2号机汽轮机DEH控制系统改造

介绍了北京京能股份有限公司2号机组的高压抗燃油纯电调控制系统改造的主要问题及其功能设计的主要特点,并提出了机组今后的完善方案。     

台山电厂1号机组高压调速汽门摆动原因分析及处理

台山电厂1号机组自投产以来高压调速汽门在运行过程中经常出现摆动的现象。通过对引起摆动故障原因的分析。提出了一系列提高机组安全稳定运行的措施。经过实际运行证明这些措施是有效的,达到了预期的目的。     

新型1600HP钻井泵曲轴的结构设计与有限元分析

针对传统钻井泵的曲轴结构缺陷,本文提出了一种新型的曲轴结构,采用的四支撑结构,减小了曲轴支撑的跨度,提高了曲轴的刚度、改善了曲轴受载情况。利用ANSYS有限元分析软件对新型曲轴进行刚度和强度分析,验证了该结构的合理性,证实该结构能满足设计要求。     

Cold storage of porcine plasma treated with microbial transglutaminase under high pressure. Effects on its heat-induced gel properties

The objective of this work was to study the heat-induced gelling properties, at acid pH, of porcine plasma previously treated with microbial transglutaminase (MTGase) under high pressure (HP), when kept under refrigeration conditions for different times (setting time). The results indicated that, although the cross-linking activity of MTGase was enhanced under pressure, consequently, improving the thermal gel texture, the most significant effects, particularly on gel hardness, were obtained by keeping the treated plasma solutions under refrigeration for at least 2 h before gelation. On the whole, under such conditions, increases of approximately 60% of this textural parameter, calculated on the basis of the values corresponding to the heat-induced non-treated plasma gels at pH 5.5, were achieved. However, from the SDS–PAGE profiles, it can be suggested that mechanisms other than polymerisation by MTGase explain the beneficial effects of the treated plasma cold storage on gel texture. In contrast, the setting time had no effects on the water-holding capacity of heat-induced plasma gels at acid pH value, although this gel property was slightly enhanced by submitting porcine plasma solutions to the combined treatment (MTGase plus HP), with improvements being in accordance with the better-structured network of these heat-induced plasma gels.     

高压CO2对聚丙烯溶胀行为的影响

高压CO2对聚丙烯具有塑化作用.高压DSC分析表明,随着压力的升高,聚丙烯熔点和熔融焓不断下降,在0～6 MPa范围内熔点下降速率约为0.128 ℃/0.1 MPa.由于受到高压CO2的溶胀作用影响的差异,SEM显示iPP在形貌上未发生明显变化,而rPP则变化明显,甚至因为发泡产生了纳米微孔。     

基于多通道控制器的扫频近场测量

为了对被测天线进行快速？定量的动态测量,获得天线频带特性的实时测量结果,可以采用多通道扫频近场测量方法。本文提出了一种采用85301B天线自动测量系统,使用HP85330A作为系统控制器的多通道扫频近场测量方法。在一定的频段内进行点频和扫频测试,将点频和扫频近场数据变换成远场方向图,并对各频点的数据进行比较分析。最后分析了误差产生原因并给出了一种修正方法。测试数据表明与传统的点测法相比,有效地降低了测量时间,提高了测量系统的测试效率。     

HydroCOM4.0气量无级调节系统的应用

介绍了HydroCOM4.0气量无级调节系统的原理、应用方案及对加氢裂化装置的影响。结果表明:该系统操作简单,机组运行平稳,节能效果明显,增强了活塞式压缩机的生产能力,提高了机械效率,节约了电耗。     

高加三通阀结构研究

本文介绍了高加三通阀几种结构的技术特点,分析了不同结构高加三通阀的性能,得出结论内置高压活塞三通阀适用于超(超)临界机组。     

浅析U形管高加过热段出口汽温迭取与传热面积优化

U形管高压加热器在国内外火电机组中已得到广泛应用,高加的传热面积优化具有重要技术经济意义。本文仅就顺流传热面布置下过热段出口汽温(即过热段与凝结段分界点蒸汽温度)对于计算传热面积的影响做一初浅分析。     

50MW机组负荷突变问题的探索性研究

近年来,诸多电厂反映采用"G-1型"高调门的机组在升降负荷过程中有负荷突变的现象出现,影响机组的安全运行。本文以中平能化高调门的成功改造为案本,着重阐述了对负荷突变问题所进行的深入调研分析,以及提出的改进措施。