攀钢高炉喷吹煤粉助燃剂的试验研究

为了提高高炉喷煤比、降低焦比,攀铜l群高炉进行了喷吹煤粉助燃剂的试验研究。结果表明添加煤粉助燃剂后高炉取得了较好的技术经济指标;随着助燃剂用量的增加,燃料比降低的幅度增大;高炉喷吹添加使用助燃剂后,焦炭负荷增加,焦比降低,炉顶煤气温度降低,煤气利用率提高。添加助燃剂后焦比降低了9．3kg/t,煤比降低了0．9kg/t,综合焦比降低了10．1kg／t。     

提高略钢高炉煤比的分析

1 概况 略阳钢铁厂现有2座150m~3高炉,1993年10月建成喷煤系统,喷煤工艺流程和设备选型等处于国内较先进水平。喷吹系统规模按供2座180m~3高炉(利用系数2.2)最大煤比为150kg/t设计,设计喷吹煤种为烟煤。系统投产至今一直喷吹无烟煤,高炉试喷的第一个月煤比为21.19kg/t,1994年年均煤比为34.86kg/t,未达到80kg/t的设计水平,焦比在630kg/t左右,煤焦置换比低(1994年1月份平均为0.426)。为此,西安建筑科技大学围绕略钢高炉如何提高置换比及使煤比增加到80～100kg/t进行了攻关,并取得了一定效果。     

高炉两段式喷吹煤粉工艺的生产实践

两段式喷吹煤粉工艺应用于瑞典SSAB Oxel(o)sund 2号高炉,效果显著.结果表明:若维持风口喷吹煤粉量不变,两段式喷吹煤粉工艺可以提高喷煤量,降低焦比,当第二段喷吹煤粉量5 kg/t时,焦比下降5 kg/t;改善高炉料柱透气性,降低料柱压差,使炉内煤气流分布更加合理,有助于高炉操作稳定,提高煤气利用率;第二段喷入的煤粉可以在高炉内被充分利用,并可以有效地抑制焦炭强度在高炉内的劣化,有助于降低在实施大喷煤工艺时对焦炭质量的苛刻要求;有助于减少炉墙热损失.     

低品位条件下钒钛磁铁矿高喷煤比冶炼实践

介绍了攀枝花钢钒公司1#高炉的原料结构以及在低品位钒钛磁铁矿冶炼条件下高喷煤比的生产实践。为了提高喷煤比、降低焦比,采取添加煤粉助燃剂、单枪喷煤改造为双枪喷煤、提高混合煤中高挥发分烟煤比例、提高风温和改善煤粉粒度等措施;同时,高炉采用提高鼓风动能、增加理论燃烧温度、增加矿石平台宽度稳定煤气流、减少炉温波动范围、保持适宜的造渣制度,从而改善喷吹煤粉燃烧性和提高高炉喷煤比。2014年一季度在入炉品位49.35%的条件下,喷煤比154.29 kg/t,焦比降低到421 kg/t;2014年4月在入炉品位49.32%的条件下,喷煤比164.47 kg/t,焦比降低到417 kg/t。     

氧气高炉工业化试验研究

在8m2氧气高炉上进行了工业化试验,试验氧气高炉炉缸和炉身各设1排风口,炉缸风口喷吹氧气和煤粉,炉身风口喷吹预热的焦炉煤气.试验结果表明:氧气高炉可以实现全氧大喷煤炼铁生产,吨铁喷煤量可以达到450kg,生产效率大幅度提高;炉身吨铁喷吹180ms预热焦炉煤气以后,焦比降低90kg,煤比降低50kg,生产效率提高约20%...     

涟钢2200m^3高炉喷煤控制系统

1引言 在高炉喷煤中，必需保证连续安全可靠喷吹，才能有效降低炼铁成本。因此，在保证控制安全可靠的前提下，实现连续自动喷吹，是喷煤自动控制设计者主要考虑的问题。喷煤改造前涟钢2200m^3高炉一直由喷煤车间老喷煤系统的5#、6#喷吹系统向高炉喷煤，控制系统基本上是在画面上进行手动操作，需要频繁地进行手动倒罐操作，喷吹效率低。不能根据设定喷吹率自动调节罐压及补气流量以基本稳定的喷吹率向高炉喷煤，喷吹率波动很大。另外，喷吹率最大只能到20t／h左右，以高炉正常时日产量5500t铁水计算，煤比约为80kg／t铁水，使得高炉焦比居高不下，极大的制约了炼铁生产成本的下降，大高炉生产的规模效应难以显示，因此，于2003年底开始对2200m^3高炉喷煤进行了改造。     

韶钢高炉喷煤技术的进步

韶钢高炉通过对现有喷煤系统的技术改造，主要是新建室内贮煤场、采用皮带机输送煤、增大磨煤制粉能力、采用大喷吹罐喷吹、实现喷吹PLC自动控制发展喷煤技术和优化生产管理等措施，煤比连续8个月达到153kg/t，入炉焦比下降到390kg/t。     

宝钢高炉喷吹常村贫煤的工业试验

测定了常村煤工业试验中原煤的基础特性和主要成分,分析了喷吹常村贫煤工业试验前后的生产数据,研究了工业试验中煤粉在高炉内的利用率.结果表明:常村贫煤配入量为20%～40%,采用新的常村贫煤配比后,综合燃料比低于500 kg/t,焦比低于300kg/t,煤比达到200 kg/t的水平;高炉生产保持稳定,取得了较好的经济效益,为高炉开拓新煤种和进行经济喷煤奠定了基础.     

攀钢新3号高炉提高煤比实践

本文对攀钢2000 m3高炉提高喷吹煤比实践进行了总结,通过喷煤相关设备的改进、稳定高风温、提高富氧率、优化高炉操作技术等措施的实施,取得了煤比130 kg/t、焦比467 kg/t的较好技术经济指标.     

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.     

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。     

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。     

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.     

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。     

Comparison of the results of surgical and conservative treatment of fractures of the diaphysis of the tibia

In this paper is treated the fundamental problematic of the fracture of the diaphysis of the tibia and the therapeutic results after the conservative and operative treatment are confronted. Among 518 patients with 433 open fractures and 35 with closed fractures of the diaphysis of the tibia, successful treatment of more 2/3 was obtained in the period from 1968 to 1972. Following our casuistics and literature, whose results are similar, we find out that the average total treatment of the osteosynthesis of the fracture of the diaphysis was shortened for 2,5 months depending upon the type and the localisation of the fracture. Apolied methods of the operative and conservative and conservative treatment in relation to the velocity of the medical cure as well as to the extreme anatomical-functional results are analised. We noticed that osteosynthesis, made by the intermedullary nail and the extension of the canals or by a small AO table, by the achieved stability makes conditions of immediate motions and an early rehabilitation. Because of that it gives the best functional results.