汉钢1号高炉中修实践

汉钢1号高炉容积1080m3,高炉利用2020年热风炉中修时机对高炉的设计内型、热风炉拱顶、炉顶装料设备、高炉冷却系统进行了优化改造.高炉复风后实现了快速达产达效,达到了中修优化改造的目的.     

高炉炉缸活性的分析探讨

高炉安全长寿、降低高炉能源消耗成为现代高炉技术发展的主要方向,而其关键在于提高高炉炉缸活性.在介绍高炉炉缸活性变差特征的基础上,从高炉上部调剂、下部调剂、渣铁物性、高炉原燃料性能等方面,就如何提高高炉炉缸活性进行了分析和探讨.     

我国炼铁技术现状及对焦炭质量的要求

近年来中国炼铁工业快速发展,高炉生产技术也取得了长足进步,今年全国重点钢铁企业高炉焦比创造出历史最好水平.但是炼铁技术发展很不平衡.随着高炉大型化的发展,高炉对焦炭质量的要求日益提高.主焦煤的短缺,制约了中国高炉大型化的进程.应大力推广捣固炼焦、干熄焦、煤调湿等技术,以缓解我国主焦煤资源的短缺,满足高炉的需求.     

武钢1号高炉冶炼专家系统开发的新进展

武钢等单位开发的高炉专家系统已在武钢1号高炉投入生产运行.该专家系统的主要功能包括:高炉布料控制、炉温预报、高炉操作炉型的管理及控制、高炉炉缸炉底侵蚀的预测模型,以及理论焦比计算模型等.以上模型已在线运行一年多,对改善高炉操作发挥了重要作用.     

我国高炉工艺设计的技术进步

对我国高炉工艺设计的技术进步进行了阐述,认为在高炉大型化、高富氧高风温大喷煤、高效长寿高炉技术、高风温热风炉、高炉煤气干式布袋除尘、高炉煤气压力能回收、高炉设备和耐火材料国产化等方面取得了长足的发展,并指出了我国高炉生产面临的问题.     

中国高炉炼铁技术的进展

中国高炉炼铁技术进步迅速,生产技术指标不断改善.论述了当前中国高炉炼铁在精料、喷煤等方面的技术进步;提出了急需注意的高炉无序建设等问题,以及高炉生产技术上需要改进的薄弱环节;同时就继续加强节能、精料、长寿和清洁生产等热点问题进行探讨.进一步明确了中国高炉炼铁技术进步的发展方向.     

包钢高炉炼铁优化配矿平台的开发与应用

为了降低高炉炼铁系统原料成本,实现自铁矿石采购到高炉炼铁全过程协同优化,开发了一个高炉炼铁全系统、全流程优化配矿平台.全流程是指从铁矿石采购到高炉产出铁水的整个工艺流程,全系统是指钢铁企业所有高炉炼铁整体系统.优化配矿平台包括数据库系统、单座高炉优化配矿平台、全系统高炉优化配矿平台、生产数据采集与分析平台4部分.平台以...     

碳中和背景下的低碳冶金初探与工业实践

"碳中和"、"碳达峰"背景下,钢铁企业实现节能减排以铁前工序最为关键,低碳冶金现存多种工艺路径,主要分为非高炉炼铁和低碳高炉炼铁两大门类.高炉喷吹焦炉煤气的工业化应用为高炉富氢冶炼实现了良好的开端.未来,高炉仍将作为炼铁工业的核心装备,高炉低碳冶炼、全氧高炉、氢冶金的发展将为我国实现碳达峰碳中和作出积极贡献.非高炉炼铁...     

2011-2014年全国大型高炉焦炭指标统计分析

焦炭质量是大型高炉保持稳定顺行、提高节能降耗能力、促进高炉长寿高效的重要基础.文章根据中国钢铁工业协会高炉生产技术专家委员会2011-2014年4000m3以上大型高炉月度生产技术指标的统计数据,对大型高炉焦炭指标进行分析,并与全国平均值进行对比.讨论了各大高炉单一指标稳定性,得出焦炭综合指标,尝试探求大高炉焦炭质量的总体评价标准,以利于各钢铁企业针对自身的原燃料条件及高炉操作情况,制定适合自身高炉冶炼特点的焦炭指标.     

鞍钢铜冷却壁高炉的热负荷管理

对鞍钢2座相同铜冷却壁结构高炉的热负荷管理经验进行了总结.新2号高炉与新3号高炉的炉体结构、操作制度完全相同,但新3号高炉的热负荷、渣皮稳定性远不如新2号高炉.为加强对铜冷却壁渣皮稳定性管理,鞍钢开发铜冷却壁炉型管理模型,重点监视渣皮厚度与脱落情况变化,控制高炉热负荷在合适范围内,保证了高炉稳定顺行.     

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.