包钢热电6~#汽轮鼓风机振动故障诊断与处理

本文针对包钢热电厂6#汽轮鼓风机组检修后起车轴瓦振动超标,通过四通道时域波形的采集,利用频谱分析及有关故障诊断理论,对汽轮鼓风机组振动进行了分析与处理,最后得出振动主要是鼓风机蜗壳裂纹导致机组阻尼刚度下降,自激振动激发了机组固有频率引起,并总结了引起大型鼓风机组振动的常见原因及处理办法。     

大型轴流鼓风机组防喘实验振动原因分析及处理

介绍了大型轴流鼓风机组的特点及工艺系统,探讨了大型鼓风机组防喘振动原因,并以某企业大型鼓风机组调试过程中,防喘实验非正常振动处理方案为实例,分析了大型鼓风机组机防喘实验机组振动的处理方案。     

AI型离心鼓风机组的故障诊断与处理

根据对AI800-1.28型离心式鼓风机进行振动监测和频谱分析,指出电机负载端滚动轴承座内孔磨损及联轴器轴心对中不良是引起机组电机振动超标的主要原因,通过采取电机轴承座内孔热喷涂修复工艺及提高机组安装找正精度等措施,消除了鼓风机组故障,保证了机组可靠稳定的运行。     

2#汽轮鼓风机凝汽器技术改造

天铁2#汽轮鼓风机机组改造后汽轮机汽耗量增加,运行中出现了凝汽器真空缓慢下降,凝汽器端差增大,汽轮机排汽温度显著升高等问题,影响鼓风机正常运行。通过分析计算发现原有凝汽器冷却面积不够用,并提出了2#汽轮鼓风机和备机4#汽轮鼓风机的凝汽器连接的具体措施,取得了良好的效果。     

D900-37型汽轮鼓风机的形成及应用

三明钢铁厂为提高风机出力，满足３１４ｍ～３高炉小高压炉顶供风的需要，决定重新配置一台汽轮鼓风机组。但国内无此种类型成套机组的定型产品，故通过认真的校验和计算，决定将杭汽厂的Ｎ３—２４型汽轮机与沈鼓厂的Ｄ９００—３１风机经改进后两者配套，从而形成新的Ｄ９００—３７型汽轮鼓风机组。文章介绍了改进方法及所遇到主要技术问题的处理办法。     

用振动分析法诊断轴流式鼓风机的故障

对攀钢热电厂国产3250轴流式汽轮鼓风机的振动响应分析,发现这类风机的低压端(2瓦、3瓦),对转子不平衡等激起的低频振动较敏感;而高压端(1瓦、4瓦)对叶片工况等激起的高频振动较敏感。经两个中修周期的监测,证实了上述分析。利用频谱分析后的特征频率下的振动值,可进行更直观的趋势分析,实践证明这种方法有效。在对机组的定期监测过程中,成功地预测了机组的故障,保证了机组及相关设备的安全生产。     

热电厂6#汽轮鼓风机振动故障诊断及处理

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,通过对该故障的诊断,利用在线动平衡方法对故障进行了处理.     

浅谈S1200_(-12)离心鼓风机故障原因及处理方法

本文探讨了S1200-12鼓风机滑动轴承失效、增速器齿轮噪声大和振动大、机组找正精度破坏导致机组振动等多种故障原因及处理方法。     

热电厂6#汽轮鼓风机振动故障诊断及处理

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,通过对该故障的诊断,利用在线动平衡方法对故障进行了处理.     

高炉鼓风机组电机白噪声干扰振动故障诊断

通过对AV100高炉鼓风机组振动故障诊断分析,确定了引起电机振动异常波动的原因为白噪声干扰,通过对症处理最终消除了故障。     

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)     

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.     

Quality of life of relatives of mental patients

Usage of quality of life of psychiatric patients' relatives as the parameter of estimation of the quality of psychiatric care is considered. By means of standard questionnaire elaborated by the authors as well as by means of both individual and group conversations the quality of life was analyzed in 40 relatives which lived together with psychiatric patients. Different spheres of their life and difficulties (financial, social-psychologic, production) were examined in families with such patients. The defects of psychiatric care that had direct influence on the quality of life of the psychiatric patients' relatives are outlined.