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介绍了一种测量汽轮机轴承振动的新方法.它是在汽轮机轴承的垂直、水平和轴向3个位置的表面各贴一个反光物质,当激光器发出的光线照射在反光物质并反射到某个平面上两个相互垂直的敏感传感器(简称PSD)时,从PSD传感器的检测电路就能输出轴承表面的振动波形,然后利用比较器从3个方向的振动位移选取一个最大值,当最大值超过汽轮机的轴承位移的规定值时,汽轮机跳闸停机并报警.另外,还着重介绍了PSD的测量原理、检测电路等.最后介绍了利用PSD测量汽轮机的轴承振动的优点,这为以后研究汽轮机轴承振动的测量提供了一种新的思路. 相似文献
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某汽轮发电机组1号轴承振动超标,通过对振动进行测试和分析,发现1号瓦振动过大并不是由于汽轮机本身所引起的。结合机组启停过程振动变化和振型图分析,发现1号轴承振动实际上是由于发电机振动传递所诱发的。通过发电机平衡,解决了汽轮机前轴承振动。这种由于轴系振动传递所诱发的汽轮发电机组故障现象值得重视。 相似文献
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针对核电660MW汽轮机轴承低频振动问题,通过改变机组转速、功率及润滑油压等试验,分析了低频振动特征,指出转子轴向低频振动引起可倾瓦轴承低频振动。通过建立转子轴向约束简化模型,分析汽轮发电机转子轴向低频振动机理为推力轴承油膜失稳及轴向扰动力引起转子轴向低频共振,并与可倾瓦轴承油膜失稳及瓦块颤振两种故障模式进行了对比。对汽轮机转子轴向低频振动及其引起的可倾瓦轴承低频振动,提出调整推力轴承间隙的措施并消除了低频振动。 相似文献
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50MW抽汽冷凝式汽轮机叶片断裂原因分析 总被引:1,自引:0,他引:1
阐明了50MW抽汽冷凝式汽轮机转子动叶片对汽轮机组安全稳定运行的重要性、分析了引起汽轮机叶片断裂的多种原因,根据上海石化热电一站50MW抽汽冷凝式汽轮机在运行工况下叶片断裂的症状,以及在汽轮机检修过程中对叶片断裂截面的剖析,着重分析了热电一站汽轮机历年叶片断裂的原因,认为提高汽轮机叶片设计可靠性,加强汽轮机叶片的特性监控,以及控制运行中汽轮机中压缸的蒸汽流量,是防止50MW抽汽冷凝式汽轮机叶片断裂的主要手段。 相似文献
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《Applied Energy》2005,81(2):127-151
Optimizing the gas-turbine combined-cycle is an important method for improving its efficiency. In this paper, a dual-pressure reheat combined-cycle was modeled and optimized for 80 cases. Constraints were set on the minimum temperature-difference for pinch points (PPm), superheat approach temperature-difference, steam-turbine inlet temperature and pressure, stack temperature, and dryness fraction at the steam-turbine’s outlet. The dual-pressure reheat combined-cycle was optimized using two different methods; the direct search and the variable metric. A technique to reduce the irreversibility of the steam generator of the combined cycle was introduced. The optimized and the reduced-irreversibility dual-pressure reheat combined-cycles were compared with the regularly-designed dual-pressure reheat combined-cycle, which is the typical design for a commercial combined-cycle. The effects of varying the inlet temperature of the gas turbine (TIT) and PPm on the performance of all cycles were presented and discussed. The results indicated that the optimized combined-cycle is up to 1% higher in efficiency than the reduced-irreversibility combined-cycle, which is 2–2.5% higher in efficiency than the regularly-designed combined-cycle when compared for the same values of TIT and PPm. The advantages of the optimized and reduced-irreversibility combined-cycles were manifested when compared with the most efficient commercially-available combined cycle at the same value of TIT. 相似文献
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汽轮机运行条件存在随机波动性,对汽轮机的稳定运行造成一定影响。以往的研究多将汽轮机的工作环境条件作为确定因素,未考虑其随机变化的影响。本文将汽轮机背压、径向气流角和进口流量作为服从一定概率分布的随机变量,采用多项式混沌方法结合计算流体力学(CFD)模拟仿真,研究了以上参数的随机波动对某汽轮机末两级叶片气动性能的影响。结果表明:计算进口边界条件的设置方法对汽轮机末两级总体性能的计算结果影响不大,当给定进口流量边界条件时,末两级效率的计算结果最高;在接近堵塞工况时,进出口条件的随机变化对通流流量的影响不大,但效率存在明显的波动,进口气流角对总体性能的影响相对较小;当背压和进口流量存在随机波动时,末级动叶中激波位置小范围波动,激波位置对径向气流角的波动不敏感。 相似文献
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IntroductionThe flow through the exhaust hoods of steam andgas turbines is still a problematic matter today. The latestexperiments and CFD research are proof of that, e.g.works published by Solodov, Gnesin (1997)['], Sultanian,Nagao and Sakamoto (1998) ['], and other authors.The flow of the steam through the exhaust hood of acondensing steam tUrbine depends to a considerableextent on the swirl of the flow in the inlet section. Thechange of an inlet swirl results in changes in the loss ofki… 相似文献
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汽轮机排汽缸是连接凝汽式汽轮机末级出口至冷凝器的通道,改善其气动性能可提高汽轮机的效率。本文从数值分析及试验两方面对排汽缸的研究进行了分析,并对提高气动性能的新型措施进行了归纳。分析表明:末级与排汽缸湿蒸气汽液两相流的联合数值分析是排汽缸流场数值分析的发展方向;模型试验是排汽缸研究的主要方法,由于进口气流对排汽缸性能的影响敏感,进口流场应反映末级出口气流的真实状况,并要特别注意叶栅顶部出口气流的模拟。提高排汽缸气动性能的新型措施为:采用具有负超高的扩压器和非对称扩压器;中分面布置轴向栅格型涡阻尼器;采用除湿措施,减少湿度损失;冷凝器喉部结构及加强系统的改进。 相似文献