AEM对EVA电缆材料性能影响的研究

应用乙烯-丙烯酸酯橡胶(AEM)与乙烯-醋酸乙烯酯共聚物(EVA)、氢氧化镁(MH)、氢氧化铝(ATH)以及沉淀法白炭黑(SiO2)进行熔融共混复合,制备出系列EVA基电缆材料。应用扫描电镜(SEM)、差示扫描量热仪(DSC)、万能试验机和极限氧指数测试仪对EVA材料的结构和性能进行表征和测试。研究结果表明,AEM明显提高了EVA电缆材料的耐油性能,当AEM含量为3. 0%时,电缆材料综合性能优良,其LOI达到39. 3%,拉伸强度和断裂伸长率分别为11. 6 MPa和142%。     

电缆防火涂料研究进展及国内外产品现状

电缆防火涂料是涂覆于电缆表面,用于阻止电缆表面火焰蔓延,提高其防火性能的装饰性涂料。针对现阶段我国电缆防火涂料产品应用范围较窄、发展缓慢,现有产品难以满足各类线缆应用场所的防火保护需求等问题,对电缆防火涂料产品及应用特点、国内外相关规范标准现状、主要防火机理、产品现状、研究进展进行了详细综述,并系统介绍了国内外主要电缆防火涂料产品类型、性能及特点,探讨了电缆防火涂料的发展趋势。     

无卤低烟阻燃耐火电缆及其工艺的探讨

近年来,国家对于电缆行业的监督管理越来越严格,客户对于电缆的各种常规指标也有了一定的了解。然而对于电缆的部分性能,客户却难以进行测量或者是判断其是否能够达标。其中低烟指标以及阻燃性等都是难以进行判断的指标。同时,各种新技术的出现对于电缆的低烟阻燃、耐火性等也有着较大的影响。文中,主要介绍无卤低烟阻燃、耐火电缆产品的性能及影响其性能的因素,并探讨了其结构设计及技术工艺。通过研究,可以对无卤低烟阻燃、耐火电缆产品有更加清晰的了解。     

高性能LLDPE电缆护套的研制

采用扬子石化公司生产的LLDPEX基体树脂制备通信电缆用黑色LLDPE电缆护套料,研究了电缆护套料各组分选择、用量和加工工艺对其性能的影响,给出了成型电缆护套的工艺条件。结果表明,该电缆护套料的配方合理、加工工艺可行,性能达到了国家标准要求,尤其是拉伸强度、断裂伸长率、耐环境应力开裂等性能优异。该电缆护套料的加工性能可满足生产通信电缆外层护套的要求,生产的护套的各项指标均达到邮电部标准要求。     

复合铅盐稳定剂在PVC电缆料中的应用

对复合铅盐稳定剂种类的选择、使用的份量对PVC电缆耐热性能，加工性能和电缆缘性能等指标的影响进行了研究，并提出了使用建议。     

交联电缆用LDPE树脂性能及其应用

利用拉伸试验、红外光谱、凝胶渗透色谱、差示扫描量热法、流变表征等方法，对交联电缆用QLT17 LDPE树脂的性能进行了表征分析，研究了以QLT17 LDPE为基础树脂分别制备的硅烷交联和过氧化物交联聚乙烯电缆绝缘料的性能，并介绍了QLT17 LDPE在交联聚乙烯电缆绝缘料中的工业化应用。结果表明，QLT17 LDPE是一种性能优异的交联聚乙烯电缆绝缘料基础树脂。     

变电站低压电缆绝缘层老化特征及老化模型

为了研究变电站低压电缆绝缘层老化特征及老化模型,对低压电缆样本进行加速老化并研究了样本理化及电气性能变化特征.制备4组低压短电缆样本,对其中3组样本在1 kV工频交流电压下分别进行7,14,21 d的加速老化.老化结束后,用扫描电子显微镜观测样本微观形貌,用傅里叶变换红外光谱仪检测样本化学结构,用卤素水分仪测定样本含水...     

石油化工企业变配电站及电缆敷设场所消防设施选择分析

对石油化工企业变配电站、电缆夹层、电缆隧道场产所火灾的原因进行分析,对油气田和石油化工场所的消防设施灭火原理及性能进行分析比较,提出了石油和石油化工企业的变配电站及电缆敷设场所消防设施选用ABC超细干粉灭火系统的可行性。     

11O kV电缆内部放电故障分析与机理研究

某石化厂110 kV单芯电缆出现内部多处放电、灼伤外屏蔽层故障,为寻找其故障产生的原因,开展了技术研究,包括电缆剖面结构分析、灼伤点材料成分分析和X射线检测分析,结果表明电缆进水吸潮、铝护套与绝缘屏蔽层之间的间隙较大或阻水带失去半导体性能,都会造成电缆放电灼伤等故障,建议石化企业加强单芯电缆的运行管理并开展电缆在线监测研究.     

聚氨酯护套电缆挤出工艺探讨

聚氨酯(TPU)作为电线电缆护套材料具有突出的优点,现正逐步取代PVC、PE、各种合成橡胶等作为电缆的外护套,用于各种恶劣的环境中.本文介绍了聚氨酯电缆护套材料的基本性能,并对该材料的加工设备、加工工艺及加工模具进行了具体论述,给出了较优的加工工艺和条件,并对常见质量问题提供了参考解决方案.     

Validation of the lumped parameter code COCOSYS against large‐scale OECD PRISME 2 fire experiments

Fire safety analysis is a major issue for nuclear power plants (NPPs) in the context of deterministic safety assessments as well as of probabilistic safety analyses. Oil reservoirs and cables represent major fire loads. Therefore, simulations of oil and cable fires are of interest for quantifying the risk of such internal hazards in NPPs. To investigate the applicability of lumped parameter (LP) modelling, validations against fire experiments are required. In this way, results obtained with the LP code COCOSYS for simulations of oil and cable fire experiments conducted in the OECD PRISME 2 Project are presented. The PRISME 2 VSP (vertical smoke propagation) tests involving oil fires in a confined and mechanically ventilated facility were used to assess the ability of the LP code to simulate smoke propagation through a horizontal opening from the fire compartment to a compartment on top of it. As it was already identified in the “International Collaborative Fire Modelling Project (ICFMP),” this type of opening might cause problems in fire simulations, particularly for zone or LP fire models. In these simulations, attention has been paid to the coupling between the fire and the surrounding environment due to the decrease of oxygen concentration. Furthermore, different cable materials have been tested in the PRISME 2 CORE (completing and repeating) test campaign. By simulating the CFS‐3 (cable fire spreading) test with confined underventilated conditions, the applicability of the COCOSYS cable fire model with input parameters deduced from open atmosphere fire tests (CORE‐2) was analysed. Results show that the applicability of a LP fire model to predict the pyrolysis rate is partly limited for both oil and cable fires, in confined environment. However, simulations with prescribed pyrolysis rates show encouraging results in good agreement with the experimental data and underline the capability of the LP code COCOSYS to simulate the interaction between the thermal hydraulics inside compartments and the fire source.     

小排量高扬程潜油离心泵的研究与应用

针对开采中后期的中深度油层开发的实际现状,需要小排量高扬程的潜油离心泵。通过对影响潜油离心泵提液性能的叶导轮结构尺寸和性能参数的研究,开发研制出单级高扬程潜油离心泵叶导轮,同时进行高扬程潜油离心泵耐高压密封工艺研究,并形成综合配套工艺。该小排量高扬程潜油离心泵在现场应用增油提液效果良好,性能稳定,应用前景广阔。     

Device for more efficient production of heavy oil

The exploitation of heavy oil in the future will require new technical solutions for more efficient production. One of them is the oil well heating by electric heating cable. So far a rare use of devices with heating cable for paraffin deposition prevention has resulted in an invention of a new technical solution. The developed device has an original way of very simple installation of the heating cable into the well, and so overcomes the main disadvantage of existing devices. Also, the device heating control unit precisely doses the needed amount of heat for oil heating that makes device energy efficient. Using of this technical solution increases well productivity by improvement of heavy oil rheological properties.     

电缆防火涂料在高速公路隧道中的应用研究对比

在运营中的高速公路隧道,由于防火需要,现在基本都在使用膨胀型电缆防火涂料。本课题通过试验应用对比,确认电缆防火改性涂料(纳米技术)与普通水性电缆防火涂料在高速公路隧道这一特殊环境下的使用效果。为高速公路隧道电缆防火和消防设计提供参考依据。     

Pine needle oil causes avoidance behaviors in pocket gopherGeomys bursarius

Essential oils from coniferous trees contain secondary metabolites that act as feeding deterrents for a number of herbivorous mammals. We investigated effects of pine needle oil on feeding and other behaviors of herbivorous plains pocket gophers. In experiment l, pocket gophers were offered sweet potato from single feeding stations placed in home cages of individually housed animals. Stations contained either a scent dispenser with pine needle oil or mineral oil. Subjects removed significantly less food from stations scented with pine needle oil. Experiment 2 was performed to investigate neophobic responses to odors.d-Pulegone, presented under conditions identical to those used in experiment l, did not reduce food removal compared to mineral oil. In experiment 3 pocket gophers were observed in a maze consisting of a start box connected to two goal boxes by tunnels. One goal was scented with pine needle oil, the second with mineral oil. Subjects entered goals scented with pine needle oil significantly less frequently than goals scented with mineral oil and spent less time there. They performed all recorded behaviors at lower frequencies while located in pine-scented goals. In experiment 4 animals were introduced into a maze consisting of a start box from which two soil-packed tunnels could be entered. Embedded in the soil of one tunnel was a barrier of electrical cable that had been soaked in pine needle oil, the second tunnel contained a barrier of cable soaked in mineral oil. Pocket gophers gnawed significantly less insulation from cable treated with pine needle oil than from cable treated with mineral oil. Our results show that constituents in pine needle oil are aversive to plains pocket gophers. Under natural conditions they may function as feeding deterrents. Some of the compounds may be suitable repellents for control of pocket gopher damage.     

石油库站着火爆炸事故的应急处置研究

由于油料特殊的物化性质,在库站储存、收发过程中极易造成火灾、爆炸事故,从而导致重大人员伤亡及财产损失。论文针对油罐火灾、罐(槽)车火灾、输油管线破裂火灾、加油站火灾及电器火灾五种事故形式,在深入分析其各自特点的基础上,提出了切实可行的应急处置方案,为石油库站火灾事故应急抢险方案制定、具体实施提供了重要参考。     

通信电缆用聚乙烯热收缩制品专用料

研究了通信电缆用热收缩制品聚乙烯专用料的原料，工艺流程，性能及其影响因素，以LDPE为基础树脂，添加EVA，炭黑，抗氧剂，助混剂等，经熔融共混挤出造粒制得专用料，测试结果表明，所研制的各项性能均达到YD／T 590．2－1992要求，且优于常规电缆护套料。     

耐高温高压封隔器胶筒的研制

采用HNBR作为耐高温高压封隔器胶筒的主体材料,确定了制品配方。胶简在模拟井下工作状态（柴油、150＂C）试验中密封压差达35MPa,经过2个疲劳循环试验后胶筒完好,耐油、耐压和密封性能满足油田作业要求。     

浅谈电助熔电源电缆布置优化

针对窑炉电助熔应用不同的电源电缆布置方式,通过专用仪表对电缆电流进行测量并分析对比数据,阐述了电缆错相布置对电缆电流平衡分布的积极意义。举例分析减少电源电缆铜损的可行性,论证玻璃钢桥架和电气绝缘板等电缆支撑方式的必要性,同时对比、分析不同电缆线径和不同电缆数量在实际应用中的效果差异。     

HRS复合解堵剂在油井上的应用

压裂是低渗或特低渗油层增产的主要方法。压裂液破胶不及时、不彻底乃至在裂缝中形成滤饼，降低了油层裂缝的导流能力。采用一种专门用于降解聚合物和生物堵塞的HRS复合解堵剂于压裂工艺，提高了压裂的导流能力，达到了增油的目的。