风机监控系统在烧结生产中的应用

沙钢烧结分厂主抽风机系统在使用了两台主抽风机监控系统后,不仅保障了生产过程的安全稳定,还有效地提高了主抽风机的工作效率,本文介绍的是该风机监控系统的基本结构和原理及现场的应用情况等.     

汽轮机替代电机拖动烧结主抽风机的探讨

阐述了用汽轮机替代电机拖动烧结主抽风机降低成本的可行性、可靠性,介绍了汽轮机拖动烧结主抽风机系统、汽轮机设计的特殊考虑及其优缺点,分析比较了汽轮机替代电机拖动烧结主抽风机的经济性。采用汽轮机替代电机拖动烧结主抽风机技术成熟,可实现节能降耗的目的。     

大型烧结主抽风机改造方案研究

论述了大型烧结主抽风机改造方案确定的基本原则、方法和步骤,明确了主抽风机轴功率及单位产品电耗的计算方法。通过实例,阐明了大型烧结主抽风机改造方案确定的过程。     

烧结厂180 m2烧结机主抽风机故障诊断及防止措施

针对邢钢烧结厂大烧结机主抽风机振动大的问题,从剖析主抽风机检修数据入手,认为烧结机废气温度高是引起风机振动的主要原因。通过调整入口锥、风门开度、主抽风机与电机之间的联轴器对中等措施,保证了主抽风机稳定运行。     

吉铁75 m2烧结机主抽风机主轴弯曲原因分析及改造

介绍了烧结主抽风机在运行过程中存在的问题,并阐述了主抽风机主轴弯曲的原因和改进措施。     

济钢400m2烧结机抽风系统工艺设备改造

济钢400 m2烧结机自投产后抽风系统出现了主抽风机喘振、机头除尘气力输送系统故障以及烧结风量分配不均等一系列问题.经过近一年对主抽风系统、沿线管道和机头气力输送系统工艺设备的改造,彻底解决了烧结风量分布不均、主抽风机喘搌以及机头除尘气力输送系统故障等问题,改造效果显著.     

太钢烧结主抽风机转速的智能控制

 主抽风机采用变频技术后,为了通过调整主抽风机转速实现烧结过程稳定的目的,研究了主抽风机转速、烧结风量、烧结机速和垂直烧结速度之间相关关系,开发了以垂直烧结速度为判据的主抽风机转速自动控制系统。太钢烧结机应用该技术后,过程垂直烧结速度稳定性大幅提高,保证了烧结终点持续稳定在倒数第2个风箱范围内,终点稳定率为98.1%,比人工控制提高35.5%,烧结返矿率比人工控制降低3.46%。同时,该技术更好地发挥了主抽风机变频的优势,主抽电耗进一步降低,较工频运行时节省电能28.6%。     

300m~2烧结机主抽风机振动诊断分析与治理

300m~2烧结机主抽风机直接地影响烧结机的产量,质量和能耗,是烧结生产的"心脏",如果一旦主抽风机因为发生了损坏和故障造成无法工作,那么造成的事故将会是非常大,同时将影响烧结的生产,造成巨大的经济损失。因此主抽风机必须具备效率高、长期连续稳定运转、容量大、使用寿命长等特性。风机在运转过程中常常由于各种原因引起振动,严重时可能影响风机的安全运转,但是产生振动的原因却是非常复杂的。本文通过对烧结主抽风机运行状态及趋势的诊断分析,有效治理了烧结主抽风机在正常运行中出现的不同程度振动烈度超标,也为烧结主抽风机振动的诊断分析与治理积累了经验。     

烧结厂余热利用与主抽汽轮机驱动案例分析

以湘钢2×360 m2烧结余热发电、燕山钢三期烧结机主抽风机汽轮机拖动,以及江苏镔鑫特钢材料有限公司200 m2烧结机主抽风机采用汽轮机和电机联合驱动为案例,对烧结余热锅炉蒸汽的几种典型应用和烧结主抽风机使用汽轮机拖动的现状及其合理性进行了分析。     

长钢200 m2烧结机主抽风机振动的分析与处理

介绍了长钢200 m²烧结机1号主抽风机振动的原因分析和处理过程,总结了长钢在主抽风机管理方面的经验,并提出了作者的观点。     

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.