马钢9号高炉无料钟炉顶料流调节阀开度的测试

1 引言 马钢9号高炉(350m~3)在2001年底大修后,采用PW紧凑型串罐式无料钟炉顶,于2002年1月31日竣工投产。9号高炉炉顶设备组装高度为11382mm,设计炉顶压力0.15MPa炉喉直径4300mm,布料溜槽长度2000mm,料罐有效容积为12.8m~3,下     

酒钢1号高炉无钟炉顶投入运行

酒泉钢铁公司1号高炉有效容积1513米~3,于1984年10月15日停炉大修,1985年元月1日修复出铁。大修后炉顶改为无钟炉顶装料设备;供料、装料系统采用PC—584微机控制。炉顶上料仍为斜桥料车上料。无钟炉顶结构特点为:两个料车分别与左右两个固定受料漏斗和两个20米~3的料罐相配合;旋转溜槽的传动为PW式,即用主、副两电机带动行星差动减速机以实现溜槽规定运动;气密箱的冷却和密封以及二次均压均采用加压净高炉煤气。     

应用可编程序控制器实现高炉上料自动化

首都钢铁公司新2号高炉是我国唯一使用皮带上料的无料钟炉顶高炉,容积1327m~3.在这座高炉上首次应用了可编程序控制器对N_1皮带上料系统、N_2皮带机运烧结矿系统、N_3皮带机运杂矿、生矿及球团矿系统、N_4皮带机运焦系统、炉顶料罐系统、布料溜槽系统、垂直探尺系统、水平探尺系统、液     

梅山1号高炉无料钟炉顶的设计与使用

1.1号高炉大修开炉概况梅山铁厂现有两座高炉原容积1060 m~(3),1985年和1986年相继进行大修,大修后的高炉有效容积分别为1080 m~(3)和1250 m~(3)。在大修改造中采用了串罐无料钟炉顶及其它10余项新技术、新设备。其中1号高炉已于1986年1月15日开炉投产。几个月来的生产实践表明,大修后采用的大多数新技术都发挥了作用,尤其是串罐无料钟炉顶对高炉的操作、顺行起了     

2500m3高炉串罐式炉顶装料系统设计

串罐式无料钟炉顶是高炉布料的主要方式,本文详细介绍了其系统组成,旋转溜槽是其主要工作部件,上部调节的预期目标依靠灵活的溜槽布料来实现,相关装置主要包括：称量罐、受料斗、阀箱、布料器,并配置了均排压系统、液压系统、气密系统、冷却系统等,串罐式设计保证料罐中心线与高炉中心线一致,避免了下料和布料过程中的粒度和体积偏析,使料面形状更容易控制,更能发挥布料功能潜力,有利于高炉上部块状带煤气化学能和热能的充分利用。     

高炉布料溜槽故障分析及长寿化应用实践

对鞍钢3200 m~3以上高炉炉顶布料溜槽故障原因进行了分析,对鞍钢现有高炉布料溜槽进行一系列的优化改进。生产实践表明,改进的布料溜槽完全满足3200 m~3高炉高温高强度的冶炼需求,达到预期使用寿命,取得了良好的经济效益,是一种耐高温长寿型高炉布料溜槽。     

酒钢2号高炉强化冶炼生产实践

1 概述 酒钢2号高炉有效容积为750 m~3,1989年12月16日投产至今已生产7年。炉顶为串罐无料钟炉顶,上料系统由PC584微机自动控制。炉身冷却系统为三层支梁式水箱及10段冷却壁,其中第8段及第10段为勾头     

炼铁炉料质量跟踪系统的设计

正高炉入炉炉料结构分为:烧结矿、球团矿、生块矿、焦炭等,它们存放在不同的料场或料仓,通过分段皮带运输到高炉料仓,高炉筛分后再通过高炉主皮带运送到高炉炉顶,经过缓冲仓—受料斗—料罐—布料溜槽,最后规律地布到炉喉截面上。本设计涉及冶金高炉炼铁供料环节,是以RFID技术为依托追踪高炉冶炼炉料物流运送和质量的方法。     

高炉锰铁冶炼工艺的改进

目前科索高尔斯克钢铁厂用两台有效容积分别为408和880m~3的高炉生产高碳锰铁,其平均技术经济指标见表。高炉经过专门改造以冶炼锰铁,它具有本厂冷却壁结构的单一冷却方式。按炉身的整个高度,在炉腹内装置嵌砖冷却壁。炉喉保护板、炉顶外封板、煤气上升管套筒和大钟料斗等装有     

我国高炉设备的发展过程,现状和趋向

(一) 从建国开始至70年代初期20多年间,通过苏联技术援助建成鞍钢、本钢、武钢、包钢等一批高炉(容积为930～1513m~3),同时各冶金设计院、冶金机械厂和重型机械行业很快掌握了大中型高炉设备的设计和制造技术(除蒸汽透平鼓风机外),使我国高炉设备的技术水平很快达到世界50年代的先进水平。60年代以后,武钢、本钢和鞍钢进一步将高炉容积扩大至2000～2586m~3,随着炉顶操作压力和热风温度的提高,对炉顶装料和密封设备、热风炉结构、炉体冷却以及炉前机械等都作了一些改进。70年代初,开始     

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.