电阻法高炉炉衬测厚技术及在宝钢1号高炉上的应用

电阻法高炉炉衬测厚技术能在线连续监测炉衬的现存厚度及变化,分辨率达到30mm。采用这一技术可以随时了解高炉炉衬的侵蚀状况,从而改进操作,加强维护,使高炉安全生产和长寿。本文介绍了这一技术及在宝钢1号高炉的应用结果。     

基于对流换热边界算法的炉衬烧蚀系统

利用对流换热边界算法,应用C#高级语言,莱钢为1#1 880 m3高炉开发出了基于OPC技术数据采集、自动绘制截面侵蚀线及温度云图的在线高炉炉衬烧蚀系统。应用表明,该系统可以实时、直观地向使用者展现高炉炉衬烧蚀状况,为高炉生产运行中的护炉工作提供指导。     

电容法检测高炉炉衬侵蚀状况的仿真研究

提出了一各利用安装在高炉炉衬外表面的多极板电这价值叫骂在阵列检测高炉炉衬侵蚀状况的新方法。有限元仿真研究结果表明,炉衬的侵蚀状况与传感器的输出值密度相关。该方法可为高炉炉衬侵蚀状况的监测提供一种牢固可靠、非侵入式的新手段。     

高炉炉衬厚度测定技术

高炉炉衬厚度测定技术ＴｅｃｈｎｏｌｏｇｙｆｏｒＢｌａｓｔＦｕｒｎａｃｅＬｉｎｉｎｇＴｈｉｃｋｎｅｓｓＭｅａｓｕｒｅｍｅｎｔ１内容简介：高炉炉衬厚度测定技术是一项国内首创的、采用电阻法检测高炉炉衬厚度的新技术。该测量方法在国外尚未见应用。该技术可在线检...     

高炉炉衬厚度测定技术

高炉炉衬厚度测定技术ＴｅｃｈｎｏｌｏｇｙｆｏｒＢｌａｓｔＦｕｒｎａｃｅＬｉｎｉｎｇＴｈｉｃｋｎｅｓｓＭｅａｓｕｒｅｍｅｎｔｌ内容简介：高炉炉衬厚度测定技术是一项国内首创的、采用电阻法检测高炉炉衬厚度的新技术。该测量方法在国外尚未见应用。该技术可在线检...     

高炉炉衬侵蚀边界识别的数值模拟

利用非稳态热传导反问题(IHCP)数学模型研究了高炉监测热电偶数据与高炉炉衬侵蚀厚度的关系.求解此反问题采用了整个时间域上的空间距离步进迭代算法和离散软化过滤法.根据上海梅山钢铁厂3号高炉采集的热电偶数据,模拟计算得出高炉炉衬剩余厚度随时间的变化关系.模拟结果证明了边界识别算法的可行性及其广阔的应用前景.     

超声波检查高炉炉衬的损蚀

高炉生产的科技进步远景是向高炉操作人员提供高炉生产全方位的动态信息。在近代生产条件下的耐火炉衬承受着巨大的热应力和物化反应的负荷,需要能随机跟踪炉体砌砖侵蚀状况,因此要求研制出可动态检测炉衬砌砖蚀损程度的方法。超声波法检测炉衬砌砖的厚度原理是基于超声波在炉衬与炉     

高炉炉衬检测技术应用及展望

现代高炉寿命主要取决于耐火炉衬的剩余厚度,因此检测炉衬侵蚀状况十分必要。详细论述了电阻法、超声波法、声超声回波(AU-E)法、模型推断法等几种典型高炉炉衬检测技术的基本原理、结构、系统或设备及应用状况。通过对各种直接测量法和间接推断法的综合比较及评价,指出了高炉炉衬检测技术的未来发展趋势。基于炉内热电偶的有效温度读数和应力波发射等先进直接测量技术,并结合热模拟及结果输出和反馈的检测方法,将是未来监测生产高炉炉衬侵蚀状况的最完善方法。     

转炉炉衬激光测厚技术的应用及定量化

 将激光炉衬测厚技术应用到实际生产,实现炉衬侵蚀部位及变化程度的定量化,从而实时在线掌握炉体工作衬的变化量,及时发现并修补炉体薄弱部位。试验结果说明,转炉大面加料侧是转炉前期最严重的侵蚀位置,而中期是在转炉耳轴方向的剖面,后期存在于整个转炉炉衬。并把炉衬厚度控制的范围划分为3个区域,炉役进入中后期后,炉衬厚度最薄处一直控制在稳定控制区以上,炉龄能够坚持超过经济炉龄（2.0万~2.3万炉）。     

电阻法高炉炉衬测厚技术

北京钢铁研究总院和上海宝山钢铁总厂合作开发的一种新型的炉衬测厚技术——电阻法高炉炉衬测厚技术,由冶金工业部召开鉴定会,通过了技术鉴定. 该技术主要包括测量元件与微机监测两部分。测量元件为电阻性元件,埋设于高炉炉衬内部,随着炉衬同步地被侵蚀磨损.其长度发生变化将引起电阻值相应变化。因此,只要测出元件的电阻值,即可得知安装元件处高炉炉衬的现存厚度。根据元件电阻值的变化可以得知炉衬     

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.