高炉煤气余压发电装置振动故障分析及处理

1概述唐钢北区动力厂1#1260m3高炉煤气余压透平发电装置由成都飞机发动机公司设计制造,于1994年投产发电。额定转速为3000r/min,额定功率为4500kW/h.在近期的一次断油事故中,机组的4套径向乌金瓦烧毁,机组发生强烈的振动,轴承的油档和透平装置的轴端气封也有不同程度的损坏。经常规检修,更换轴瓦和部分气封后试车发现,轴振动随转速的增加而迅速增大,以至无法定速。采取了转子做动平衡、调整对中、改变运行条件等多种措施,未见好转。通过一系列分析与测量,发现透平机转子在轴径处弯曲。根据转子自身的结构特点,结合现场实际,采用合理的直轴…     

汽轮机振动的故障特征分析及处理

沙钢集团热电厂4^#机组小修后开机，2^#瓦产生振动且随着转速的上升及负荷的增加不断增大，机组不能正常运行。针对这一情况，对导致振动的原因进行了逐一分析，并采取了相应的处理措施，使机组稳定运行。     

碱液泵结构松动的诊断与处理

针对5^#碱液泵机组出现的异常振动问题,应用RH802双通道振动频谱分析仪对采集的数据进行诊断分析,得出碱液泵异常振动的主要原因为松动和不对中之结论,并进行针对性地处理,较好地解决了5^#碱液泵机组振动异常问题。     

汽轮机轴弯曲故障的诊断和处理

包钢热电厂6^#汽动鼓风机组在一次检修过程中，由于汽轮机提前揭缸造成汽轮机转子轴弯曲，从而引起机组运行过程中振动值偏大。主要介绍了针对该故障的诊断方法和处理过程。     

双机架冷连轧机辊系振动的研究

综合信号测试与有限元仿真,对济钢冷轧厂双机架冷轧机组（CCM）2^#机架发生的振动现象进行分析。认为此类振动为共振,可能由支撑辊磨辊不良产生表面缺陷,在旋转过程中产生简谐激振力引发轧机发生垂振。     

设备故障诊断技术在水泵中的应用

结合设备故障诊断技术分析方法,针对2^#清水泵在运行过程中振动的劣化趋势,进行故障诊断分析,确定轴承内圈存在问题,并通过更换轴承和叶轮,解决了水泵振动异常问题,使机组恢复正常运行。     

混流式水力机组防振分析

水轮发电机组在运行中的振动是一种普遍存在的不可能完全避免的现象,有设计、制造、安装、检修、运行等多方面的原因.但剧烈的振动可能导致水力机组结构破坏、降低运行效率和机组出力.异常振动一旦发生,小则产生噪音,大则危及安全,造成事故,给电厂带来巨大的损失.     

2#高炉出铁场除尘风机故障诊断及分析处理

针对梅钢2#高炉出铁场除尘风机振动异常,采用加速度传感器和数据记录仪对机组振动进行监测诊断和数据分析,查找引起设备振动的主要根源,并采取相应的处理措施,有效地消除了设备振动异常,确保设备运行稳定.     

重卷机组开卷取机减速机高速轴断裂原因分析及改造

<正>1前言涟钢重卷机组开卷取机由外方Stamco公司设计,陕西压延设备制造厂制造。2011年6月开卷机减速机高速轴断裂,2012年9月卷取机高速轴断裂,严重制约着机组的生产。2原因分析由于减速机高速档传递的转矩约为低速档的两倍,现仅对高速档进行计算。     

汽轮发电机组振动的探索

汽轮发电机组的振动，是评价机组运行可靠性的重要指标。大的振动不仅会造成停机，甚至会严重地损坏机组，发生可怕的事故。那么，是什么因素激发了振动，如何测量和分析振动以及采取哪些措施来消除振动。本文从机组振动的测量人手，介绍了评定机组状况优劣标准，探索研究了机组由于转子质量不平衡、转子弯曲、中心不正、轴瓦润滑油膜自激振荡和由于电磁方向等因素引起振动，提供了几种寻找机组振动原因的试验方法，目的是为了提高对汽轮机组振动故障的诊断，特别是对提高汽轮机的检修质量有所帮助。     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

焦炭热性能指标意义浅析

通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。     

Results of treatment of cancer of the cardia

Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients.     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Comparison of rates of infection of two methods of emergency ventricular drainage

The rates of infection of two methods of external ventricular drainage in use at Atkinson Morley's Hospital--namely, (a) percutaneous drainage with Rickham reservoirs and (b) tunnelled ventriculostomies--were compared in this retrospective review. Percutaneous drainage of CSF with Rickham reservoirs was associated with a 27% rate of infection as identified by positive microbiological cultures; tunnelled ventriculostomy catheters had a 10% infection rate. The difference in the infection rate between the two methods was statistically significant (P < 0.015). Other variables examined, including the age and sex of the patients and the reasons for ventricular drainage, were not associated with an increased rate of infection. Most infections from either method were caused by a coagulase negative staphylococcus. The average duration of ventricular drainage before identification of positive cultures was 5.7 days for Rickham reservoirs and 6.0 days for ventriculostomies.     

浅析《野草》的版画特征

鲁迅先生一生热爱美术作品,对版画中木刻兴趣尤甚.<野草>作为其"写心之作",亦呈现出一些与木刻版画一致的审美特征:一是具有木刻版画的色彩特征,多对比、多冷色,有阴郁的美感;二是具有木刻版画的力度特征,环境描写、人物刻画处处刀锋毕现,遒劲有力,有一种"力之美".     

四辊破碎机车刀架的改造

针对四辊破碎机车刀架车削中存在的几个问题,详细介绍了电动车刀架的结构和工作原理,建立主要设计参数的数学表达式,并进行适当的分析。改造后,这种电动车刀架运行平稳、可靠、方便、省力,取得了预期的效果。     

Effect of antibiotics of chemotaxis of human leukocytes

The effect of 20 different antibiotics on chemotaxis by human neutrophils was studied. Human leukocytes incubated with chloramphenicol, rifampin, sodium fusidate, and tetracyclines in vitro showed markedly depressed migration. The mechanisms by which these antibiotics affect leukotaxis are discussed.