济钢一炼铁厂高炉喷煤系统粗粉分离器的改造

1 引言 济钢一炼铁厂高炉喷煤系统建于1991年9月,承担着向6座350 m~3高炉喷吹煤粉的任务。在制粉系统中,球磨机的台时产量和煤粉的粒度是两项重要指标,它们会对高炉喷煤产生影响。然而,影响球磨机台时产量和煤粉粒度的关键设备是制粉系统中的粗粉分离器。粗粉分离器的作用是将球磨机制出的煤粉分离为成品粉供给喷吹,以及将大颗粒的煤粉返回球磨机再磨。粗粉分离器筛分效率的高低,将决定返粉中合格粉的多少和循环倍率的大小,从而直接影响球磨机的出力。由于我厂制粉系统中采用的是老式粗粉分离     

高炉喷煤工艺的进步与优化

近年来，我国高炉喷煤工艺技术取得了明显的进步，制粉系统的改进主要是：取消一次风机，采用全负压操作，减少或取消旋风收粉器，采用中速磨代替球磨机，喷吹系统的改进主要是：采用“总管加分配器”流程；广泛应用流化技术，采用上出煤喷吹工艺以实现沈相输送输送以及煤粉单管计量和调节等。     

邯钢高炉喷煤集中制粉站的设计

1 概述 邯钢现有6座高炉(1260m~3,900m~3,380m~3,300m~3×3),年产生铁260万t。原制粉系统共有4台球磨机(10t/h×2,8t/h×2),采用多级收粉系统收集煤粉。由于制粉能力的限制,喷煤量较低,影响了高炉技术经     

酒钢高炉喷煤的扩能改造

由两座高炉年产生铁120万t,吨铁喷煤量最大140kg,需煤粉量20～22t/h扩能改造为两座高炉年产生铁210～230万t的能力,需煤粉量为50～55t/h,将制粉系统由一个系列(能力为26t/h)扩建成两个系列(能力为56t/h),煤粉输送采用浓相输送.     

青岛特钢2×1800m~3高炉喷煤系统工艺设计

分析了青岛特钢2×1 800m~3高炉喷煤系统的工艺设计特点。该喷煤系统采用烟气自排式制粉工艺流程,二罐并列、单总管加炉前双分配器直接喷吹工艺。在设计中采用了定量圆盘配煤、共用煤粉仓、圆盘旋转给料喷吹及煤粉喷吹泄压返粉等先进技术。一年多的生产实践表明,该喷煤系统生产运行稳定,已基本达到设计指标,为高炉的稳定顺行创造了有利条件。     

提高高炉喷煤比的研究与改进

本文针对煤粉系统的改进和原料条件的改善，介绍了改善高炉操作后的制粉能力和高炉煤比提高的情况。     

科技成果

安钢高炉烟煤无烟煤混喷技术应用 为了进一步提高高炉喷煤量,安钢对原制粉、喷吹系统进行了改造,使进入球磨机预热煤粉的调节气全部为热风炉废气,避免了系统氧含量的增加和波动,同时在关键部位增设了事故充氨装置,并实现了关键部位氧含量和温度的自动检测等。由于安全生产得到了保证,该厂又开始试验烟煤无烟煤混喷,以及     

炼铁厂煤粉输送系统改造简介

炼铁厂煤粉输送过去采用螺旋泵。该设备对于制粉系统远离高炉喷吹站的武钢,经过十多年的生产实践证明,不能满足向高炉喷吹站输送煤粉的要求,是高炉喷吹量受到限制的一个环节;尤其是在高炉喷吹量越来越大的情况下,这个限制环节会更加突出。因此,要加以改造,使之能适应高炉大喷吹量的要求。 1.仓式泵输送系统的选择炼铁厂拥有四座大型高炉,目前高炉平均日产量在11000~12000t,四座高炉都喷吹煤粉,喷吹量已达50~60kg/t铁,个别高炉有时达70kg/t铁以上,每天的煤粉需要量在600~700t。在“七五”期     

昆钢6号高炉混合煤喷吹工业试验

为了提高球磨机的制粉能力,综合利用资源,提高喷煤量,降低成本,昆钢6号高炉利用无烟煤喷吹系统进行了混合煤喷吹工业试验.3个月的工业试验表明,当烟煤配比达33%时,煤比可提高15～20kg/t.     

昆钢6号高炉混合煤喷吹工业试验

为了提高球磨机的制粉能力，综合利用资源，提高喷煤量，降低成本，昆钢6号高炉利用无烟煤喷吹系统进行了混合煤喷吹工业试验，3个月的工业试验表明，当烟煤配比达33％时，煤比可提高15－20kg/t.     

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。     

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。     

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.     

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.     

参与式农业基地建设行动方案设计

为了编制实用性强的基地建设行动方案,首先,确定参与式发展的主体,搭建一个"决策框架";其次,针对行动目标,提出不同参与主体,如管理者、农民、消费者等团队与个人的目标及行动内容;最后,工作应向重塑伙伴式合作关系,挖掘农民自我发展潜力,完成三大角色的转换,打造农业基地文化等方向推进.