共查询到20条相似文献,搜索用时 78 毫秒
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某燃气轮机电厂9F燃气轮机存在透平轴承漏油现象,影响机组安全稳定运行。通过分析排查,确定透平轴承漏油的原因为油封齿间隙变大、进油压力过大,或者油封回油能力不够,并采取一系列改造措施,如更换节流孔板以降低进油压力、油封齿槽开孔以增加回油量,以及减少油封齿间隙,最终透平轴承漏油问题得到解决。研究成果可为9F燃气轮机解决类似的问题提供一定的借鉴意义。 相似文献
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针对常规岛给水泵CAP1400可倾瓦滑动轴承-转子系统安全、平稳运行问题,利用有限元QZ算法计算不同支撑工况下的临界转速。首先设计五瓦可倾瓦轴承,计算了轴承的油膜厚度、刚度和阻尼等非线性动力参数;其次,建立轴承-转子系统模型,采用油膜的特性数据求解可倾瓦轴承-转子系统在刚性支撑、弹性支撑以及"湿态"支撑工况下的临界转速;最后,对给水泵进行联机试验,采集不同流量工况下轴承不同方位的振动值。结果表明:可倾瓦轴承的油膜厚度在0.04-0.05 mm之间,刚度随着转速的增大而增大,而阻尼反之;刚性支撑下的临界转速大于弹性支撑,而"湿态"工况下水膜刚度的增加使得一阶临界转速在8 100-8 777 r/min之间,远大于实际运行速度;试验测得轴承垂直、水平和轴向上振动值与振动速度均满足国家标准。临界转速的计算与试验结果为CAP1400常规岛给水泵可倾瓦轴承-转子系统安全平稳地运行提供了设计依据。 相似文献
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舰用燃气轮机在启动停机或升速降速过程中,其工作状态与稳定工况有很大差别,其振动现象和规律也有很大差异。有时,机组在启动中出现叶片磨损或轴承损坏等故障,故障后可能引起严重的振动损坏。因此,测量和分析燃气轮机过渡态的振动特性,寻找其规律,为排除故障,保证机组可靠运行是十分必要的。由于燃气轮机的结构复杂及其运行特点所决定,它的振动现象也是一个复杂的过程。所有振动频率分量均不稳定,振幅具有随机性,尤其在过渡态机组的振动现象可谓瞬息万变。因此,用随机振动理论来研究燃气轮机的振动问题是适宜的。我们应用快速付里叶分析仪 相似文献
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针对国产引进型300MW汽轮发电机组调试阶段经常发生7号轴承的振动超标问题进行深入分析。提出励磁机——发电机转轴三支撑结构使得7号轴承振动时不平衡响应非常灵敏,振动较大时容易发生密封瓦和转轴静止部件发生摩擦,进一步加大振动,通过现场高速精细动平衡,圆满解决了7号轴承的振动问题。 相似文献
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《International Journal of Hydrogen Energy》2022,47(63):26789-26797
The issues related to the reliability of hydrogen engines of unmanned vehicles and increasing the efficiency of using hydrogen as fuel when using the method of its production during the decomposition of hydrogen-containing molecules of liquid-phase organic compounds in a plasma discharge under the action of intense ultrasonic exposure are considered. Experiments have shown that as a result of decomposition in the acoustoplasma discharge of liquid hydrocarbons, solid-phase carbon-containing products are formed, chemical transformations occur in the liquid phase and hydrogen-containing combustible gas is formed. Hydrogen-containing gas can be used as fuel immediately after synthesis, i.e. it does not require separation, since in addition to hydrogen it contains only impurities of CO2 and water vapor. The purpose of the study is to formalize the basic conditions for tightening the control of mutual compliance with the efficiency of hydrogen engines of the same series in the conditions of their mass production. Methods of mathematical statistics and hardware-software modeling were used in the study. The term “unerroric of quality mutual compliance control” is introduced to describe a set of hardware and software tools for such control. The principle of in-depth testing of the technical condition of such engines of one series is described in a multidimensional formulation of the quality control problem for three of their operating parameters at once. The conditions for increasing the mutual correspondence of the measured values of such parameters in the conditions of serial production of hydrogen engines are formalized. 相似文献
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基于《水工混凝土掺用氧化镁技术规范》中的Ⅰ型氧化镁(MgO),研究了该型MgO膨胀剂(MEA)细度对掺粉煤灰水泥浆体膨胀性能的影响。即采用X射线衍射分析(XRD)及同步热分析(TG DSC)分析了掺MEA水泥浆体中MgO的水化性。结果表明,养护温度相同时,MEA的细度对水泥浆体内MEA中MgO的水化和水泥浆体的膨胀无显著影响,产生的膨胀均能补偿水泥浆体的收缩;MEA的细度可从试验设计采用的45 μm筛筛余15%左右增加到30%左右,这将有利于MEA生产企业的节能降耗。 相似文献
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应用瞬态谱分析方法对燃烧流化床声波信号进行了频谱分析,发现气泡能量分布呈Gamma分布形式,在Argyrious和Yoshida等人提出的模型的基础上,发展了燃烧流化床气泡能量分布模型,并通过优化迭代对模型参数进行求解,在实验和理论的基础上得出了更加切合实际的燃烧流化床气泡能量分布模型 相似文献
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汽油特性参数间的关系分析 总被引:1,自引:1,他引:1
汽油的特性参数对汽油机的燃烧和排放具有重要影响。通过对市售汽油特性参数间关系的统计分析,得到了汽油密度同汽油的平均氢碳原子数之比和汽油空气混合气的理论空燃比之间的线性关系式。这些统计关系式可用于由测量的汽油密度值推测汽油平均氢碳原子数之比和汽油空气混合气的理论空燃比等,还可用于改善汽油机热计算精度和汽油机空燃比的测量、控制精度。 相似文献
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车门是机车车体的重要部件,是司乘、维修人员的通道口,它具有分隔空间、密封防雨、隔音消音、保温隔热等功能,紧急情况下作为逃生救护通道。通过回顾大连机车车辆有限公司使用过的铁路干线机车车门,浅析其结构特点,并对比介绍了近年来新开发的两种铝合金结构车门。 相似文献
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Hydrogen absorption kinetics of vanadium–aluminum alloys in the temperature range of 624–924 K have been studied. These alloys were prepared by the aluminothermy process and refined by electron beam melting. The data of instantaneous reacted fractions at four different temperatures were obtained using the pressure drop method and these data were linearly fitted to a suitable reaction mechanism function. Three-dimensional diffusion appears to be the intrinsic rate limiting step of the hydrogen absorption. The rate constants were obtained from the slope of the linearly fitted curves. Apparent activation energies were calculated using the Arrhenius equation. The activation energies were increased linearly with aluminum content resulting in a decrease in the hydrogen absorption rate. The variation in standard entropies and enthalpies of vanadium–hydrogen solid solution has been studied as a function of aluminum content. 相似文献