邯钢高炉有害元素的分布及控制

重点对邯钢高炉有害元素的分布情况进行了分析,认为邯钢高炉碱金属负荷较高,烧结矿、球团矿、焦炭是高炉碱金属的主要来源。针对邯钢高炉生产现状,在碱金属的控制、锌元素的控制和氯元素的控制等方面采取了一些技术措施,使得高炉碱金属负荷由3.80 kg/t下降至2.92 kg/t,锌负荷由320 g/t下降至236 g/t,燃料比降低7.4kg/t,炉况顺行显著改善,保证了高炉顺行。     

石横特钢1~#1080m~3高炉低燃料比生产实践

石横特钢1#1 080 m3高炉通过细化铁前管理、控制铁水化学成分、优化高炉布料、改善炉前操作、经济喷吹等一系列制度措施,实现了2014年全年高炉炉况稳定顺行,高炉灰铁比18.30 kg/t,煤气利用率45.53%,燃料比511.07 kg/t,其中干焦比326 kg/t,煤比144.36 kg/t(富氧≤1 500 m3/h)。     

济钢高炉喷煤数学模型的研究与应用

基于湍流两相流理论建立了高炉喷煤两相流动及传质三维数学模型。采用该模型指导高炉生产 ,高炉利用系数由2 .7t/(m3.d)提高到 3 .0 t/(m3.d)以上 ,焦比由 460 kg/t降到 40 0 kg/t,煤比达到 10 0 kg/t,提高了高炉的各项经济技术指标。     

铁水硫含量控制技术经济分析

通过对鞍钢炼铁工序和炉外脱硫工序技术经济分析,得出高炉生铁含硫每提高0.001%,则高炉入炉焦比、综合焦比分别下降0.68 kg/t、0_49 kg/t,高炉日产量增加0.16%,但使炉外脱硫成本增加0.27元/t。综合高炉及炉外脱硫的吨铁成本的变化,铁水含硫每提高0.001%,综合效益为0.49元/t。     

水钢3号高炉富氧鼓风实践

水钢3号高炉通过富氧鼓风,使3号高炉的技术经济指标有了进一步的改善和提高,日产量由3 066t/d提高到3 354t/d,焦比从412kg/t降至388kg/t,煤比从112kg/t提高到了138kg/t。     

昆钢高炉喷煤系统技术改造

通过对喷煤设施的改扩建,昆钢高炉喷煤系统生产能力有较大提高,年制粉能力已达40万t,6号高炉煤比现已达到140 kg/t,并已具备煤比170kg/t的喷吹能力,5号高炉煤比可达100 kg/t.     

高炉配加高钛型球团矿的工业试验及应用

通过高炉配加10%～40%高钛型球团矿替代混合球团矿工业试验,探索出了高钛型球团矿对烧结和高炉生产的影响。工业试验表明,高炉配加高钛型球团矿后,由于烧结配料中钒钛磁铁矿用量减少,烧结矿转鼓提高1.18%,返矿率降低1.33%,高炉煤气流分布更加合理,高炉利用系数提高0.11t/（m3.d）,煤比增加22kg/t,焦比降低18kg/t。推广应用期间,高炉稳定顺行,炉缸活跃,利用系数提高0.141t/（m3.d）,高炉各项指标得到明显优化。     

用炉腹煤气量指数和透气阻力系数优化高炉操作

针对邯钢1号高炉稳定性降低、生产指标下滑的状况,高炉生产技术人员积极转变操作理念和思路,运用炉腹煤气量指数和透气阻力系数来优化高炉操作,高炉的稳定性及各项技术经济指标得到明显改善。实践表明,1号高炉炉腹煤气量在7500～7700m3/min、炉腹煤气量指数在59～62m/min、透气阻力系数在3.4～3.7,高炉日产量较调整前提高329 t/d、燃料比降低11 kg/t、焦比降低34 kg/t、煤比提高23 kg/t。     

济钢4号高炉喷吹焦炉煤气工业试验

对济钢4号高炉喷吹焦炉煤气工业试验进行了总结。工业试验结果表明:如果企业焦炉煤气资源过剩,选择高炉喷吹焦炉煤气能够产生一定的经济效益,并且能够减少CO_2排放;只要确定的高炉喷吹焦炉煤气工艺路线正确、方法得当,喷吹焦炉煤气的安全问题是完全能够得到保证的;4号高炉喷气量在62.51 m~3/t时,能够降低焦比5.28 kg/t,降低煤比40.63 kg/t,吨铁成本降低10.42元/t,减少CO_2排放量75 kg/t。     

氧气高炉喷吹气化炉重整煤气工艺的?分析

为降低氧气高炉炼铁工艺流程中循环煤气分离和煤气预热成本, 提出氧气高炉喷吹气化炉重整煤气炼铁工艺流程.采用?分析方法对该工艺过程和传统高炉炼铁工艺过程的主要?指数进行计算和评价分析, 结果表明:在传统高炉工艺中, 高炉单元和整体系统的?损失（指每吨铁水,下同）分别为0.911 GJ/t和1.636 GJ/t;在氧气高炉喷吹气化炉重整煤气工艺中, 高炉单元和整体系统的?损失分别为0.298 GJ/t和0.826 GJ/t; 另外, 传统高炉和氧气高炉喷吹气化炉重整煤气工艺系统的?效率分别为83 %和91 %.该工艺能够实现冶金和化工行业的联合生产, 对于促进工业联产具有重要意义.      

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.