邯钢3200m~3高炉中修停炉及开炉操作

邯钢3200m~3高炉中修停炉时,采用前期快速降料面、憋压出铁、充氮气保护、根据料面深度控制风量与打水量等措施,实现了高炉安全、环保、快速停炉。停炉后,采用不入炉直接更换铜冷却壁技术,使炉内降温、冷却壁更换与炉顶设备更换同时进行,既节约了中修时间,又避免了快速降温大量打水破坏炉缸炭砖。高炉中修开炉非常成功,开炉第3天利用系数达到2.45,燃料比降到495 kg/t。     

2500m~3高炉开炉及达产实践

对南钢2500m3高炉开炉及快速达产进行了总结。南钢2500m3高炉采用上罐固定中心卸料式串罐无料钟炉顶、软水密闭循环冷却、陶瓷杯 高导热炭砖炉底、铜冷却板结合铜冷却壁等先进技术。在开炉过程中,选择合适的炉料和配比,进行装料测试,确立了合适的装料制度和操作参数,使得高炉开炉顺利并实现了快速达产。     

天钢3200 m3高炉中修开炉达产实践

天津钢铁集团有限公司3 200 m3高炉由于炉体铜冷壁破损严重、炉缸侧壁温度持续居高不下,必须进行停炉中修以更换部分铜冷却壁.介绍了开炉的装料情况、加风过程等.开炉后,通过采用合理的上下部调剂、及时合理的热制度、造渣制度的调节,使高炉炉况稳定、顺行,快速达产.总结了成功和不足之处,为以后高炉快速开炉、达产积累了经验.     

芜湖新兴铸管3号高炉中修开炉达产实践

对芜湖新兴铸管3号高炉中修后开炉达产操作实践进行了总结。3号高炉在经历两次炉况失常后,生产指标劣化明显,且第八段冷却壁出现损坏,为消除安全隐患,高炉被迫进行中修。中修采用氧枪开炉技术,炉缸清理工作量较常规开炉减少50%以上,工作时间缩短2～3天,有效降低了开炉成本;送风后高炉仅3天就快速达产,日产量3668t/d,2周日产量再创新高,达到3981 t/d。     

武钢1号高炉破损调查：第二代第二次高炉本体中修

一、概况武钢1号高炉第二代从1978年12月16日大修后开炉,到1983年10月5日停炉进行第一次中修,高炉生产了四年零九个半月,产铁345.5万吨;从1983年12月18日开炉至1987年12月9日停炉进行第二次中修,高炉生产了四年,产铁348.2万吨。 1号高炉1983年第一次中修时,根据其他高炉破损调查的研究成果,对炉腹以上的冷却结构形式散了改进,并增加了炉身冷却高度。原大修时炉身下部设置的三段镶砖冷却壁未变,将三层支梁式水箱改为二段“Γ”形镶砖冷却壁,其钩头长640毫米。该部位炉衬系采用河南省产硅铝质耐火材料。 1号高炉第一次中修开炉后,1984～1985     

济钢3#1 750 m3高炉中修开炉快速达产实践

济钢3^#1750m^3高炉冷却壁水管损坏,2007年3月停炉中修,清除残余焦炭100t,更换了风口区冷却壁。由于开炉准备充分,配料计算精确、装料制度合理、操作参数选取得当,高炉开炉2d即喷煤,第3d利用系数即达到2．48U（m^3·d）,实现了开炉后3个月休风率为零。     

沙钢3号高炉开炉及达产实践

摘要沙钢3号高炉采用环保型INBA渣处理系统、铜冷却壁、高温内燃式热风炉、PW第四代并罐无料钟炉顶、法国陶瓷杯、软水密闭循环冷却等先进技术。由于开炉准备充分、参数选择合理、操作得当,高炉开炉后顺利达产,利-用系数达到2．4,创造了国内2500m^3级高炉达产的先进水平。     

四号高炉炉身塌砖的初步分析

一、炉身塌砖经过四号高炉是1970年9月建成投产的。容积2516米~3。它是我国第一座炉腹以上采用汽化冷却、取消炉缸支柱、不设炉腰托圈的大型高炉。1974年2月,因炉身冷却壁大量烧坏进行了第一次中修。1977年10月再次因为炉身汽化冷却出问题进行了第二次中修,将炉身由汽化冷却改为水冷,在沟下增加烧结矿筛分设备。1978年主要经济技术指标达到当时国内大型高炉的先进水平,年平均利用系数为1.526,焦比526.3公斤。1981年2月底炉身砖衬全部脱落,4月份进行了第三次中修。四号高炉开炉以来中修次数、中修炉身寿命及产铁量见表1。由表1可见:     

武钢2、3号高炉中修开炉之比较

从原燃料质量、开炉操作等几个方面对武钢2、3号高炉中修开炉进行了比较,对2号高炉开炉恢复顺利及3号高炉送风初期恢复困难的原因进行了分析,为以后高炉的中修开炉提供了较好的经验。     

八钢A高炉开炉实践

A高炉采用窜罐无料钟炉顶、铜冷却壁等先进技术。优化开炉操作，实现了顺利开炉和快速达产。     

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.