高炉钢冷却壁的应用及分析

钢、铸钢冷却壁已在我国鞍钢、济钢、南钢、首钢等企业的高炉上应用,并取得了一定的效果。研究和生产实践表明,钢冷却壁性能优于球墨铸铁冷却壁,在高炉炉腰、炉腹、炉身下部使用的钢冷却壁,将会起到延长高炉寿命、改善高炉冶炼指标等作用。     

汉钢1号炉炉壳烧穿原因分析

分析了2016年11月13日汉钢1号炉炉壳烧穿的原因,认为冷却壁寿命到期、焦炭质量差、冷却强度不足、炉体热流强度监控不到位、高炉操作等综合因素是导致高炉在冷却壁修复和喷涂造衬以后仅20天时间就烧穿的主要原因。     

马钢2500m^3高炉炉腹冷却壁的更换

马钢2500m^3高炉生产6年7个月后,炉腹、炉身下部的冷却壁和炉腰冷却板损坏严重,计划体风16天进行更换,2000年12月6日高炉休风,到20日高炉复风,共用14天半时间,成功地更换了炉腹及其以上4段冷却壁和炉腰1段冷却板,为延长高炉寿命,采用了遥控补造衬技术,对风口以上部位进行了喷补造衬。     

马钢2500m~3高炉炉腹冷却壁的更换

马钢2500m~3高炉生产6年7个月后,炉腹、炉身下部的冷却壁和炉腰冷却板损坏严重,计划休风16天进行更换。2000年12月6日高炉休风,到20日高炉复风,共用14天半时间,成功地更换了炉腹及其以上4段冷却壁和炉腰1段冷却板。为延长高炉寿命,采用了遥控喷补造衬技术,对风口以上部位进行了喷补造衬。     

冷却柱技术引进与自主开发实践

2006年8月酒钢1#高炉炉腹6、7段冷却壁有4块冷却壁破损。当时引进使用铜冷却柱技术替代恢复已损坏冷却壁冷却功能效果良好。2007年以来6#高炉炉身冷却壁破损加剧,又引用同一厂家铜冷却柱技术。实践证明该技术是一种成熟可靠而实用的高炉护炉技术。但是随着4×450 m3高炉冷却壁频繁破损,依靠大量外购冷却柱来满足护炉需要的成本非常巨大,而且对企业的局限性很大。我们通过自主研制开发,生产出来可替代外购产品的铜钢一体冷却柱和钢质冷却柱,既节省了外购资金又完全满足护炉需要。     

高效长寿高炉的冷却结构及冷却强度刍议

重点就高炉设计、改造、生产操作及维护中,经常遇到一些有关高炉冷却工艺和结构上的问题,如冷却壁冷却比表面积、冷却结构、冷却水质、热负荷、水速等进行了讨论.认为:应改善冷却壁结构,提高冷却比表面积达1.2以上;炉缸宜采用卧式弧形光面冷却壁;新设计高炉时应适当缩小炉腹角,己投产高炉则应适当调整风口小套的长度,以达到缩小操作炉...     

安钢1号高炉冷却壁整体浇注实践

对安钢1号高炉冷却壁整体浇注实践进行了总结,阐述了冷却壁整体浇注工艺及技术难点.利用环保限产停炉时机,采用冷却壁整体浇注技术更换了 1号高炉部分漏水冷却壁.1号高炉开炉后的生产实践表明,冷却壁整体浇注结构整体性好,操作炉型较为规则,稳定性好,能够形成稳定的渣皮,有利于炉况稳定顺行;与浇注前相比,高炉主要技术经济指标不断...     

我国大型高炉长寿技术发展现状

论述了我国大型高炉长寿技术的发展现状。在大型高炉设计中,通过优化炉型、采用合理炉缸内衬结构、铜冷却壁、软水密闭循环冷却系统、薄壁内衬等技术为高炉长寿创造条件。通过自动化检测与控制、炉体维护等技术使高炉寿命达到15年以上。对高炉炉缸内衬结构、铜冷却壁、软水密闭循环冷却系统、薄壁内衬的应用进行了评述,对我国大型高炉长寿技术的发展提出了建议。     

铜冷却棒在临钢1号高炉的应用

临钢1号高炉炉皮常有烧红甚至烧穿现象，严重影响高炉的正常生产。通过在冷却壁集中破损的部位安装铜冷却棒代替破损冷却壁，使生产恢复了正常，效果良好。     

马钢2500m^3高炉冷却壁的改进

马钢2500m^3高炉2000年大修时，对高炉冷却壁和1层炉腰冷却板存在的问题进行了分析，并对冷却壁结构作了改进，新一代冷却壁已成功应用于生产实践。     

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.